PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
This PDF file contains the front matter associated with SPIE Proceedings Volume 7593, including the Title Page, Copyright information, Table of Contents, and the Conference Committee listing.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
In just a few decades, micro and nano technologies have changed the way that we live - how we work and communicate;
the food and medicine that we consume; the clothing that we use; and the entertainment that we seek. While these
technologies are being actively investigated in several research communities, the potential for continued societal impact
is constrained by resources available for system-level research. Given the long time-lines and levels of investment that
are typically necessary to develop functional systems, strategic prioritization of research directions from the perspective
of societal needs can be helpful. This paper outlines the findings of an NSF-sponsored road-mapping workshop that was
held in 2009, with the intention of initiating a conversation about the opportunities and challenges for micro and nano
systems. Four areas of need were discussed: environmental sensing; health care; infrastructure monitoring; and energy
alternatives. Possible research trajectories were identified by envisioning technological goals for the year 2040, and
linking these to horizons for 2015 and 2025. This paper also provides few examples of current research in each of the
four application domains. It is noted that a systems perspective can help to keep the research focused, accelerating and
amplifying the societal gain with available resources. Practical and affordable solutions at the system level will require
partnerships between specialists, and also between academia and industry.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
The observation of agent concentrations is of major importance for a lot of areas such as medicine, process and
environmental analysis. The aim of this research work is the development of an analytical tool with the potential to
online-monitor concentration changes. For this purpose the combination of surface enhanced Raman spectroscopy
(SERS) and a microfluidic device seems to be a promising approach. This approach is capable for a qualitative as well
as quantitative analysis. In summary the great potential of surface enhanced Raman spectroscopy in combination with a
microfluidic device for a quantitative analysis will be shown.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We have developed a rapid microfluidic mixing device to image fast kinetics. To verify the performance of the device it
was simulated using computational fluid dynamics (CFD) and the results were directly compared to experimental
fluorescence lifetime imaging (FLIM) measurements. The theoretical and measured mixing times of the device were
found to be in agreement over a range of flow rates. This mixing device is being developed with the aim of analysing fast
enzyme kinetics in the sub-millisecond time domain, which cannot be achieved with conventional macro-stopped flow
devices. Here we have studied the binding of a DNA repair enzyme, uracil DNA glycosylase (UDG), to a fluorescently
labelled DNA substrate. Bulk phase fluorescence measurements have been used to measure changes on binding: it was
found that the fluorescence lifetime increased along with an increase in the polarisation anisotropy and rotational
correlation time. Analysis of the same reaction in the microfluidic mixer by CFD enabled us to predict the mixing time
of the device to be 46 μs, more than 20 times faster than current stopped-flow techniques. We also demonstrate that it is
possible to image UDG-DNA interactions within the micromixer using the signal changes observed from the
multidimensional spectrofluorometer.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We present a new method for in-situ synthesis of multiple color and shape encoded particles in microfluidic channel
using single material. Material developed in this work is M-Ink whose color is magnetically tunable and lithographically
fixable. By combining novel material system and special instrumentation enables generation of limitless number of codes
and greatly simplify the manufacturing process of encoded particles.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
A real-time monitoring of the diffusion coefficient using a micro sensing device is valuable for analyzing the dynamic
change of protein-protein interactions and the protein conformation, such as the molecular size and the higher order
structure. In the present study, we have developed a novel micro-optical diffusion sensor (MODS) based on a laserinduced
dielectrophoresis (LIDEP) enabling small sample volume and high-speed measurement. This paper reports the
measurement principle, chip design, and the validity of the proposed method. MODS consists of a pair of transparent
electrodes and a photoconductive layer sealing the liquid sample. AC voltage is applied between transparent electrodes,
and two excitation lasers are intersected on the photoconductive layer. The electrical conductivity distribution of the a-
Si:H layer due to the photoconductive effect generates a non-uniform electric field followed by the dielectrophoresis
(DEP), and then the concentration distribution is induced by LIDEP force. After cutting the AC voltage, the mass
diffusion is occurred, and the diffusion coefficient can be obtained by observing the one dimensional diffusion process
along with the interference fringe pattern. In the preliminary measurement, the prototype of the DEP cell was fabricated
by the micro electro mechanical systems (MEMS) technique in order to verify the applicability of MODS, and we
confirmed the lattice-shaped concentration distribution of polystyrene beads in distilled water. The decay time of the
diffusion of the concentration distribution agreed well with the theoretical calculation. As a result, the applicability of
MODS as the diffusion coefficient measurement method was verified.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We introduce a novel tuning mechanism based on pressure actuating force, which can enable a broad spectrum of
tunable elastomeric optofluidic devices. Thanks to the flexibility of the Polydimethylsiloxane (PDMS) material, the local
deformation inside PDMS chip can be generated by filling the compressed air/liquid into the embedded channels. Such
tuning method turns out to be very simple for fabrication and control, also being compatible with microfluidic chips. To
this end, we have demonstrated the pressure mediated tunable optofluidic gratings, tunable optofluidic laser, and
microfluidic 2×2 optical switch.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
As part of our research on the manufacturing science of micron scale polymer-based devices, an automated production
cell has been developed to explore its use in a volume manufacturing environment. This "micro-factory" allows the
testing of models and hardware that have resulted from research on material characterization and simulation, tooling and
equipment design and control, and process control and metrology. More importantly it has allowed us to identify the
problems that exist between and within unit-processes. This paper details our efforts to produce basic micro-fluidic
products in high volume at acceptable production rates and quality levels. The device chosen for our first product is a
simple binary micromixer with 40×50 micron channel cross section manufactured by embossing of PMMA. The
processes in the cell include laser cutting and drilling, hot embossing, thermal bonding and high-speed inspection of the
components. Our goal is to create a "lights-out" factory that can make long production runs (e.g. an 8 hour shift) at high
rates (Takt time of less than 3 minutes) with consistent quality. This contrasts with device foundries where prototypes in
limited quantities but with high variety are the goal. Accordingly, rate and yield are dominant factors in this work, along
with the need for precise material handling strategies. Production data will be presented to include process run charts,
sampled functional testing of the products and measures of the overall system throughput.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
The growing complexity of microfluidic devices is currently leading to an increased dimensional scale dynamics, i.e. the
range of sizes of features on the microfluidic device is steadily increasing, from centimeter-sized features like reservoirs
over millimeter-sized features like fluidic connections and micrometer-sized features like microchannels to nanometersized
features like surface textures. In order manufacture these devices with polymer replication technologies like
injection molding and hot embossing, molding tools (masters) have to be fabricated which contain the same structural
dynamic range. Often, this is not possible using a single tooling technology. We therefore present examples of such tools
which have been fabricated using two techniques on the same master structure, namely precision mechanical machining,
single-point diamond turning (SPDT) and stereolithography.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
This contribution describes first results concerning the overall and especially optical system design of microfluidic skin
patches for drug detection based on fluorescence analysis of sweat samples. This work has been carried out within the
European project LABONFOIL which aims to develop low-cost lab-on-chip systems for four different applications, one
of them for the detection of cocaine abuse by professional drivers. To date work has focused on the integrated design of
the skin patch itself including methods for sweat collection as well as studies concerning the feasibility of OLEDs for
optical excitation of the fluorescence signal.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Applying electrical fields is a simple and versatile method to manipulate and reconfigure optofluidic devices. Several
methods to apply electric fields using electrodes on polymers or in the context of lab-on-a-chip devices exist. In this
paper, we utilize an ion-implanted process to pattern electrodes within a fluidic channel made of polydimethylsiloxane
(PDMS). Electrode structuring within the channel is achieved by ion implantation at a 40° angle with a metal shadow
mask. In previous work using the ion-implantation process, we demonstrated two possible applications in the context of
lab-on-a-chip applications. Asymmetric particles were aligned through electro-orientation. Colloidal focusing and
concentration was possible with negative dielectrophoresis. In this paper, we discuss the different electrode structures
that are possible by changing the channel dimensions. A second parameter of ion implantation dosage prevents the
shorting of electrodes on the side wall or top wall of the fluidic channel to the bottom. This allows for floating
electrodes on the side wall or top wall. These type of electrodes help prevent electrolysis as the liquid is not in direct
contact with the voltage source. Possible applications of the different electrode structures that are possible are discussed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
An inexpensive and rapid micro-fabrication process for producing PMMA microfluidic components has been presented.
Our proposed technique takes advantages of commercially available economical technologies such as the silk screen
printing and UV patterning of PMMA substrates to produce the microfluidic components. As a demonstration of our
proposed technique, we had utilized a homemade deep-UV source, λ=254nm, a silk screen mask made using a local
screen-printing shop and Isopropyl alcohol - water mixture (IPA-water) as developer to quickly define the microfluidic
patterns. The prototyped devices were successfully bonded, sealed, and the device functionality tested and demonstrated.
The screen printing based technique can produce microfluidic channels as small as 50 micrometers quite easily, making
this technique the most cost-effective, fairly high precision and at the same time an ultra economical plastic microfluidic
components fabrication process reported to date.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We present the effect of surface treatments/coatings and soft bake temperatures aimed at improving adhesion and
surface uniformity of SU-8 on glass substrates. While the adhesion strength of SU-8 to metal layers on glass and silicon
has been previously investigated, our research examines the influence of additional surface treatments (RCA,
Acetone/IPA rinse) and coatings (fresh/one-day-aged Ti, fresh/one-day-aged Cr, SU-8 2005®) on adhesion strength as
well as surface uniformity for 100 μm thick SU-8 films. Additionally, we vary the soft bake times and temperatures
while keeping all other process parameters constant, to correlate adhesion strength with surface uniformity of SU-8 films
for each surface modification.
We have found that for all surface treatments/coatings, a soft bake temperature of 65°C for 90 minutes yielded a
more uniform SU-8 film (σ = 5.18 μm) as compared to the manufacturer-recommended soft bake temperature of 95°C (σ
= 12.66 μm) for 30 minutes. Consequently, a more uniform SU-8 film provided excellent adhesion strength (> 2 MPa, as
determined by stress testing using an Instron® microtester) for both metallic seed layers while the adhesion strength of
films baked at 95°C was determined to be < 0.5 MPa. This study, for the first time, has been able to quantitatively
determine the adhesion strength of SU-8 films on different seed layers deposited on glass substrates, for varying soft
bake temperatures.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Microfluidic device technology provides unique physical phenomena which are not available in the macroscopic world.
These may be exploited towards a diverse array of applications in biotechnology and biomedicine ranging from
bioseparation of particulate samples to the assembly of cells into structures that resemble the smallest functional unit of
an organ.
In this paper a general overview of chip-based particle manipulation and separation is given. In the state of the art
electric, magnetic, optical and gravitational field effects are utilized. Also, mechanical obstacles often in combination
with force fields and laminar flow are employed to achieve separation of particles or molecules.
In addition, three applications based on dielectrophoretic forces for particle manipulation in microfluidic systems are
discussed in more detail. Firstly, a virus assay is demonstrated. There, antibody-loaded microbeads are used to bind virus
particles from a sample and subsequently are accumulated to form a pico-liter sized aggregate located at a predefined
position in the chip thus enabling highly sensitive fluorescence detection.
Secondly, subcellular fractionation of mitochondria from cell homogenate yields pure samples as was demonstrated by
Western Blot and 2D PAGE analysis. Robust long-term operation with complex cell homogenate samples while avoiding
electrode fouling is achieved by a set of dedicated technical means.
Finally, a chip intended for the dielectrophoretic assembly of hepatocytes and endothelial cells into a structure
resembling a liver sinusoid is presented. Such "artificial micro organs" are envisioned as substance screening test
systems providing significantly higher predictability with respect to the in vivo response towards a substance under test.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
In-vivo cancer cells create a unique microenvironment which enables their spread to other organs. To understand the
tumor microenvironment, special tools and devices are required to monitor the interaction among different cell types as
well as the effects of particular chemical gradients. We are reporting on the status of a new device (the NANIVID:
NANoIntraVItal Device) that will collect chemotactic cells from the tumor environment. Due to the transparency of this
implantable device, direct in-vivo cell imaging both inside and outside the device is possible. The cell collection chamber
of the device consists of a micro-electrode system based on patterning of transparent, conducting films that deliver real
time data including cell density and dynamics. The current development and testing status of the device will be
presented. This will include the modeling of ligand gradient profile results produced from the device and the cell
migration in the EGF (epidermal growth factor) gradient created by the device. Further, prototype electrode arrays were
designed, fabricated and cells were cultured on the arrays at selected degrees of confluence to measure the device
sensitivity. The development path of the NANIVID will be integrated with an existing animal model protocol for in-vivo
testing. This will result in a clearer understanding of the dynamics of a tumor's metastatic progression.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
In the present study, gravity assisted capillary transport of microbead suspension is investigated theoretically.
An additional gravitational head from the reservoir which is placed at the top of the capillary is considered as
pressure force at the inlet of capillary. The pressure field distribution at the inlet of capillary is deduced to
calculate this inlet pressure force. The non-dimensional governing equation is derived by taking into account
the surface, viscous and gravity forces which act on the fluid front. Presence of microbeads delays the capillary
transport. It is observed from the numerical solution of the governing equation that, not only the aspect ratio of
the capillary but the aspect ratio of reservoir also plays a vital role in the flow front transport in the capillary.
Although higher fluid level in the reservoir has added advantage towards higher gravitational head, the resistance
from reservoir makes the progress of the flow front movement slow at the beginning of the transport. The physical
properties of the fluid also play an important role in deciding the progression fluid flow front.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
In this work, we describe the development and testing of a three degree of freedom (DOF) meso/micro manipulation
system for handling biological cells (SF-9) and micro objects. Three axis control is obtained using stepper motors
coupled to three micromanipulators. One motor is coupled to a linear X-stage which holds the test specimen. The
remaining two stepper motors are coupled to Y and Z axis micromanipulators. The stepper motor - micromanipulator
arrangement has minimum step resolution of ~0.45μm with a total travel of 10mm and the stepper motor - X stage
arrangement has a minimum resolution of ~0.3μm. The shaft end of the micromanipulator has a commercially available
electrostatic MEMS microgripper from Femtotools™ which has a gripping range of 0 - 100μm. As the gripping action is
performed, a commercially available 3 DOF haptic device (Novint Falcon) is programmed to give force feedback to the
user. Both mesoscale and microscale control are important, as mesoscale control is required for the travel motion of the
test object whereas microscale control is required for the gripping action. A LabView based system is used to control the
position of the microgripper, to control the opening of the microgripper, and to provide force-feedback through the
haptic.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Alex Fragoso, Noemi Laboria, Mary Luz Botero, Diego Bejarano, Daniel Latta, Thomas E. Hansen-Hagge, Wolfgang Kemmner, Ioanis Katakis, Claudia Gärtner, et al.
A microsystem integrating electrochemical biosensoric detection for the simultaneous multiplexed detection of protein
markers of breast cancer is reported. The immobilization of antibodies against each of carcinoembryonic antigen (CEA),
prostate specific antigen (PSA) and cancer antigen 15-3 (CA15-3) was achieved via crosslinking to a bipodal dithiol
chemisorbed on gold electrodes. This bipodal dithiol had the double function of eliminating non-specific binding and
optimal spacing of the anchor antibodies for maximum accessibility to the target proteins. Storage conditions were
optimized, demonstrating a long-term stability of the reporter conjugates jointly stored within a single reservoir in the
microsystem. The final system has been optimized in terms of incubation times, temperatures and simultaneous,
multiplexed detection of the protein markers was achieved in less than 10 minutes with less than ng/mL detection limits.
The microsystem has been validated using real patient serum samples and excellent correlation with ELISA results
obtained.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Diagnostics for low-resource settings need to be foremost inexpensive, but also accurate, reliable, rugged and suited to
the contexts of the developing world. Diagnostics for global health, based on minimally-instrumented, microfluidicsbased
platforms employing low-cost disposables, has become a very active research area recently-thanks, in part, to
new funding from the Bill & Melinda Gates Foundation, the National Institutes of Health, and other sources. This has
led to a number of interesting prototype devices that are now in advanced development or clinical validation. These
devices include disposables and instruments that perform multiplexed PCR-based assays for enteric, febrile, and vaginal
diseases, as well as immunoassays for diseases such as malaria, HIV, and various sexually transmitted diseases. More
recently, instrument-free diagnostic disposables based on isothermal nucleic-acid amplification have been developed.
Regardless of platform, however, the search for truly low-cost manufacturing methods that would enable affordable
systems (at volume, in the appropriate context) remains a significant challenge. Here we give an overview of existing
platform development efforts, present some original research in this area at PATH, and reiterate a call to action for more.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Lab-on-a-chip (LOC) systems allow complex laboratory assays to be carried out on a single chip using less time,
reagents, and manpower than traditional methods. There are many chips addressing PCR and other DNA assays, but few
that address blood cell analysis. Blood analysis, particularly of the cellular component, is highly important in both
medical and scientific fields. Traditionally blood samples require a vial of blood, then several processing steps to
separate and stain the various components, followed by the preparations for each specific assay to be performed. A LOC
system for blood cell analysis and sorting would be ideal. The microfluidic-based system we have developed requires a
mere drop of blood to be introduced onto the chip. Once on chip, the blood is mixed with both fluorescent and magnetic
labels. The lab-on-a-chip device then uses a syringe drive to push the cells through the chip, while a permanent magnet
is positioned to pull the magnetically labeled white blood cells to a separate channel. The white blood cells, labeled with
different color fluorescent quantum dots (Qdots) conjugated to antibodies against WBC subpopulations, are analyzed
and counted, while a sampling of red blood cells is also counted in a separate channel. This device will be capable of
processing whole blood samples on location in a matter of minutes and displaying the cell count and should eventually
find use in neonatology, AIDS and remote site applications.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
The present study reports an investigation of capillary transport with a suspension of microbeads and biomolecules.
Series of experiments are performed to deduce the concentration based surface tension and contact angle expression
for microbead and biomolecule suspension. It is observed that, the microbead suspension restricts the
spreading of the fluid front. Hence a decrease in the surface tension and an increase in the contact angle is
observed as the concentration of suspension is increased. Different expressions for contact angle and surface
tension depending on the range of the microbead concentrations are deduced. Theoretical model to predict the
capillary transport in rectangular microchannel considering the change in physical and surface properties of the
fluid is developed. The capillary transport in a microfabricated silicon microchannel is observed for fluid with
and without microbead. Theoretical and experimental observations match quite well, whereas the quantitative
difference in case of transport with microbead suspension is observed. Thus, the effect of suspension on the fluid
properties can not be neglected in a capillary transport.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
In tissue engineering, the enrichment of a particular cell type typically precedes in vitro culture on scaffolds. Another
separation challenge that has emerged recently in tissue engineering is the need to isolate stem or progenitor cells that
are naturally present in certain tissue types and have the ability to differentiate into functional cells. In both contexts, the
ability of microfluidic systems to handle small sample volumes and achieve highly selective separation presents an
attractive alternative to traditional techniques such as pre-plating, cell straining and sorting with fluorescent or magnetic
tags.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
In this paper, we describe the design and fabrication of a polydimethylsiloxane (PDMS) microchip for on-chip
multiplex immunoassay applications. The microchip consists of a PDMS microfluidic channel layer and a micro
pneumatic valve control layer. By selectively pressurizing the pneumatic microvalves, immuno reagents were controlled
to flow and react in certain fluidic channel sites. Cross contamination was prevented by tightly closed valves. Our design
was proposed to utilize PDMS micro channel surface as the solid phase immunoassay substrate and simultaneously
detect four targets antigens on chip. Experimental results show that 20psi valve pressure is sufficient to tightly close a
200μm wide micro channel with flow rate up to 20μl/min.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
A fully integrated microfluidic system was developed and incorporates an EC-MWCNT (electrochemical multiwalled
carbon nanotube) sensor for the detection of bacteria. Sample metering, reagent metering and delivery was
implemented with microvalves and pumps embedded inside the microfluidic system. The nucleic acid extraction was
performed using microchannels controlled using automated platforms and a disposable microfluidic silica cartridge.
The target samples were flowed and hybridized with probe ssDNA (single strand DNA) across the MWCNT-EC
sensor (built on a silicon chip), which was embedded in a microfluidic cell. The 9-pad sensor was scanned before
and after hybridization to measure the quantity of RNA (Ribonucleic acid) bound to the array surface. A rapid and
accurate sample-in answer-out nucleic acid system was realized with automated volume metering, microfluidic
sample preparation, and integrated nano-biosensors.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Falls by the elderly are highly detrimental to health, frequently resulting in injury, high medical costs, and even death.
Using a MEMS-based sensing system, algorithms are being developed for detecting falls and monitoring the gait of
elderly and disabled persons. In this study, wireless sensors utilize Zigbee protocols were incorporated into planar shoe
insoles and a waist mounted device. The insole contains four sensors to measure pressure applied by the foot. A MEMS
based tri-axial accelerometer is embedded in the insert and a second one is utilized by the waist mounted device. The
primary fall detection algorithm is derived from the waist accelerometer. The differential acceleration is calculated from
samples received in 1.5s time intervals. This differential acceleration provides the quantification via an energy index.
From this index one may ascertain different gait and identify fall events. Once a pre-determined index threshold is
exceeded, the algorithm will classify an event as a fall or a stumble. The secondary algorithm is derived from frequency
analysis techniques. The analysis consists of wavelet transforms conducted on the waist accelerometer data. The insole
pressure data is then used to underline discrepancies in the transforms, providing more accurate data for classifying gait
and/or detecting falls. The range of the transform amplitude in the fourth iteration of a Daubechies-6 transform was
found sufficient to detect and classify fall events.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Biomedical sensors combining microfluidic and electronics capabilities require defect avoidance in both the
electronic processing circuits and microfluidic areas. Microfluidic sensors involve sealed channels through which
sample fluids containing biomedical materials flow. Inserting microchannels between capacitive plates enable the
detection of biomaterials by the changes in capacitance. However, faults occur when foreign particles, or fluid bubbles
get lodged in the paths blocking a channel, thereby affecting the measured C. To achieve fault tolerance we investigate a
Cathedral Chamber design, with pillars supporting the roof at regular intervals. This prevents single blockages from
stopping fluid flow through the system in a channel, as there are many paths. We discuss the potential causes and effects
of such blockages. Monte Carlo simulations show that the Cathedral Chamber design significantly increases lifetime of
the system, an average of 6 times more particles are required before full blockage occurs compared to an array of parallel
channels. Fluid flow modeling shows parallel channels show rapid rise of pressure with the number of blockages while
the Cathedral chamber shows much slower rise, which reaches a plateau pressure until it is blocked. The impact of
defects on the capacitive measurement is also discussed. Finally, an interesting application, one that uses patches of
single chain Fragment variables (scFv's), the active part of antibodies, is also discussed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Electrochemical Impedance Spectroscopy (EIS) has been applied to the detection of analytes for
immunosensors [1-3]. The development of hand held devices based on this technique is a very
promising prospect for point-of-care applications and is an attractive alternative to laboratory-based
immunochemical analysis [1, 4]. The work in this paper will focus primarily on the development of an
EIS method of transduction for immunoassay detection that could be potentially introduced into a hand
held point-of-care device. Varying geometries of IDEs will be reported and discussed to improve the
detection of antigen.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Many established and recently-introduced optical biosensor concepts rely on the detection of a small wavelength change
in response to change of temperature, adhesion of bio-particles, strain, or chemical environment. Special coatings are
used to sensitize them to specifically bound molecules (e.g., biomarkers). We describe a compact and fast wavelength
monitor that can resolve sub-pm wavelength changes. The unit was demonstrated by reading out a FBG sensor and can
resolve wavelength changes as small as 50fm with a bandwidth of more than 100Hz.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Multiplexed patterning in the micro-scale has been required in order to accomplish functional bio-materials templating
on the subcellular length scale. Multiplexed bio-material patterns can be used in several fields: high sensitivity
DNA/protein chip development, cell adhesion/differentiation studies, and biological sensor applications. Especially, two
or more materials' patterning in subcellular length scale is highly demanding to develop a multi-functional and highintegrated
chip device. The multiplexing patterning of two or more materials is a challenge because of difficulty in an
alignment and a precision of patterning. In this work, we demonstrate that multiplexed dip pen nanolithography® (DPN®)
patterning up to four different material inks by means of using recently developed new generation nanolithography
platform (NLP 2000™, NanoInk, Inc., Skokie, IL). Ink materials were prepared by adding different colored fluorescent
dyes to matrix carrier materials, such as poly(ethylene glycol) dimethacrylate (PEG-DMA) and lipid material (1,2-
dioleoyl-sn-glycero-3-phosphocholine, DOPC). Finally, dot-array patterns of four different inks were obtained in 50 ×
50 μm2 area. This lithography platform is capable of patterning 12 separate materials within micrometer areas by
efficient use of the available MEMS accessories. This number can be scaled up further with development of new
accessories.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Various nano-structures and complex patterns have been fabricated by top-down or bottom-up approaches, which have
own strength and weakness. Here we combined the top-down and the bottom-up fabrications to take advantages on both
strengths. We demonstrated that two different ways of the top-down/bottom-up combination could be very effective for
the future nano-fabrications. One way is to assemble nanometer-sized building blocks into the device configurations
such as electronics and sensor. Our strategy is to use those functionalized peptide nanowires, which can recognize and
selectively bind a well-defined region on antigen-patterned substrates, as building blocks to assemble nanoscale
architectures at uniquely defined positions, patterned by AFM-based nanolithography. The second method of the topdown/
bottom-up combination is to pattern mineralization peptides with nanolithography and grow metals along the
peptide lines. For example, when an Au-mineralizing peptide was written in the line-array, the biomineralization yielded
monodisperse Au-NPs along the peptide lines. We were also succeeded to grow and pattern semiconductors at room
temperature as precursors were patterned with dip-pen nanolithography. This crystallization was induced by energy gain
from the shape change caused by DPN. Then, hydrophobic-hydrophilic pattern that mimics protein-binding sites in
nature could be patterned by DPN and this pattern geometry can induce the attachment-detachment switching of
proteins. At last, the electronic pathogen sensor chips will be introduced as another example for the DPN application.
Here the DPN was applied to attach single cell at a time on transducer surface, which unambiguously determined the
single cell detection limit of the sensors.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Scanning probe characterizations of porphyrin patterns created by nanografting were used to provide insight for the
molecular orientation and surface assembly of porphyrins with pyridyl and phenyl substituents. In-situ AFM provides
highly local views of the assembly of pyridyl-substituted porphyrins on surfaces of Au(111). Matrix self-assembled
monolayers(SAMs) of n-alkanethiols furnish a molecular ruler for calibrating height measurements. Nanografting can
be used for local measurements of the thickness of porphyrin films in situ by comparison with heights of n-alkanethiol
nanopatterns. When nanografted, pyridyl porphyrins were found to assemble onto gold directly into an upright
configuration, and surface binding is likely mediated through nitrogen-gold chemisorption.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
Dip Pen Nanolithography® (DPN®) is a direct write scanning probe-based technique which operates under ambient
conditions, making it suitable to deposit a wide range of biological and inorganic materials. Precision nanoscale
deposition is a fundamental requirement to advance nanoscale technology in commercial applications, and tailoring
chemical composition and surface structure on the sub-100 nm scale benefits researchers in areas ranging from cell
adhesion to cell-signaling and biomimetic membranes. These capabilities naturally suggest a "Desktop Nanofab"
concept - a turnkey system that allows a non-expert user to rapidly create high resolution, scalable nanostructures
drawing upon well-characterized ink and substrate pairings. In turn, this system is fundamentally supported by a
portfolio of MEMS devices tailored for microfluidic ink delivery, directed placement of nanoscale materials, and cm2 tip
arrays for high-throughput nanofabrication. Massively parallel two-dimensional nanopatterning is now commercially
available via NanoInk's 2D nano PrintArray™, making DPN a high-throughput (>3×107 μm2 per hour), flexible and
versatile method for precision nanoscale pattern formation. However, cm2 arrays of nanoscopic tips introduce the nontrivial
problem of getting them all evenly touching the surface to ensure homogeneous deposition; this requires
extremely precise leveling of the array. Herein, we describe how we have made the process simple by way of a selfleveling
gimbal attachment, coupled with semi-automated software leveling routines which bring the cm^2 chip to
within 0.002 degrees of co-planarity. This excellent co-planarity yields highly homogeneous features across a square
centimeter, with <6% feature size standard deviation. We have engineered the devices to be easy to use, wire-free, and
fully integrated with both of our patterning tools: the DPN 5000, and the NLP 2000.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We report a versatile, and automatic method for sorting cells and particles in a three dimensional
polydimethylsiloxane (PDMS) structure consisting of two crossmicrochannels. As microspheres or yeast cells
are fed continuously into a lower channel, a line shaped focused laser beam is applied (perpendicular to the
direction of flow) at the crossing junction of the two channels. The scattering force of the laser beam was
employed to push microparticles matching specific criteria upwards from one channel to another. The force
depends on the intrinsic properties of the particles such as their refractive index and size, as well as the laser
power and the fluid flow speed. The combination of these parameters gives a tunable selection criterion for
the effective and efficient sorting of the particles. The introduction of the cylindrical lens into the optical train
allows for simultaneous manipulation of multiple particles which has significantly increased the efficiency
and throughput of the sorting. A high aspect ratio microchannel (A.R. = 1.6) was found to enhance the
sorting performance of the device. By careful control of the microparticle flow rate, near 100% sorting
efficiency was achieved.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We present the preparation, characterization and electrical properties of a flexible electrically conducting nanocomposite
polymer which has been prepared by shear mixing of 80nm - 500nm silver particles in polydimethylsiloxane
(PDMS). We have characterized and compared the resistivity of films 3cm × 1 cm × 0.01cm in size as a function of
weight percentage of silver nanoparticles (ranging from 10 to 50) with the result that the percolation threshold is
achieved at 32.5 weight percent. The resistivity level achieved at 50 weight percentage is equal to 2.3 × 10-5 Ω-m which
is better than bulk carbon. Microelectrodes were fabricated with a height of 30μm, width of 100μm, and lengths (l)
ranging from 1mm to 10mm with a maximum current of 40mA achieved for the 1mm electrode at 1V. The fabricated
microelectrodes maintain electrical continuity on being bent, flexed or twisted and can be used for electronic routing on a
flexible circuit board of non-conductive PDMS.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
In this work, the concept of recently introduced electromagnetic pump has been presented. This pump has been proposed
for pumping biomedical fluids carrying particles sensitive to shear stresses. Its working concept depends on controlling
the rotation of two pistons placed in a circular channel in opposing polarity under the influence of a moving
electromagnetic field. Analytical and numerical investigations on the effect of pump geometrical parameters on shear
stresses at different boundary conditions are performed. The geometrical parameters include: channel aspect ratio
(channel width to height) and channel radius ratio (inner to outer radius). Non-dimensional simple analytical shear stress
expressions that are valid for a wide range of geometrical design parameters and variety of fluids are derived. CFD
simulations have been used to verify the analytical expressions within the range of studied parameters. Obtained results
showed that the analytical models predict the wall maximum shear stresses with an error less than 5% for w / h≤1.0 at
high radius ratios and with an error less than10% for Ri / Ro ≥0.3. These results help the designer in fabricating the
micropump to be suitable for biomedical applications, where saving the particles carried in fluids from damage is of high
importance.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We present fabrication of a novel (Nd0.7Ce0.3)10.5Fe83.9B5.6 magnetic powder and polydimethysiloxane bonded material
that can be micropatterned into micromagnets. The magnetic powder, with an average particle size of 5μm-6μm, has
been prepared from an alloy ingot of raw materials which are put in a vacuum induction furnace and melt spun to obtain
ribbons with nanocrystalline microstructure. The ribbons are crushed using vibrating ball milling under inert atmosphere
to obtain coarse powder (average particle size of 200μm). In order to obtain 5μm fine powder the course powder is jet
milled at 6000rpm under inert atmosphere. The fine magnetic powder (referred to as MQFP-15) is ultrasonically
uniformly dispersed in a polydimethylsiloxane matrix (PDMS) using a horn tip probe operating at a frequency of 42
kHz. Micromagnets (diameter of 50μm, height 30μm) are fabricated from the prepared composite via soft lithography
and are tested using a SQUID magnetometer, showing a remanent magnetization (Mr) of 60.10 emu/g and coercivity
(Hc) of 5260 G at 75 weight percentage of magnetic powder in the PDMS matrix.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
We fabricated SU-8 based slab waveguides on surface-modified poly(dimethyl siloxane) PDMS lower claddings for
application in evanescent field sensing. In this application, higher sensitivity is obtained by generating stronger
penetrating power above the waveguide into the analyte. This can be achieved by reducing the refractive index of the
substrate. Compared with glass substrates that have a refractive index of 1.5, PDMS has a refractive index of 1.42 at 633
nm, thus serving as a better lower cladding material for high-sensitivity sensing with an evanescent field or as claddings
in multilayer waveguide applications. In order to increase the adhesion of PDMS surfaces for successful SU-8
application we treated PDMS thin films in low-frequency (40 kHz) oxygen plasma for varied length of exposure time.
The treatment process made PDMS hydrophilic and created nano-structures on the surfaces. The resultant surface
topography with different exposure time was studied by an interferometric profiler on PDMS lower claddings and the
later spin-coated SU-8 waveguides. Measurement results showed that longer plasma treatment on PDMS claddings
significantly improved the uniformity and waviness of the waveguides. Light propagation tests performed with a prism
coupler and an end-butt coupling setup proved that PDMS can be used as a proper material for SU-8 waveguides.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
The notion of sample preconditioning, or pretreatment, as a micro-unit operation in a Lab on a Chip (LOC) system has
yet to be realized in commercial practice. As is well known, Biomarker detection in complex, biological samples, such
as blood, requires a series of pretreatment steps to enable detection of specific markers. On chip, such a process usually
relies on "off-chip" sample pretreatment prior to "on-chip" analyte manipulations and detection. Presented in this paper
is a PDMS, pretreatment chip based on the design of Oddy et al.1 with a view to enable a self-contained LOC platform.
The chip was designed to directly manipulate the suspended species while adjusting fluid properties using buffer
volumes less than 1 ml. Using previous literature related to capillary electrophoresis, a bench-scale pretreatment protocol
was developed to tune specific fluidic parameters to an optimal range, namely pH, conductivity, and viscosity. A PDMS
device was fabricated and used to combine a raw, bovine serum sample with specific buffer solutions. Off-chip
electrodes were used to induce DC-electrokinetic micro-mixing of the target analyte in the mixing chamber, where a
homogeneous analyte distribution was achieved in less than one second using an 800V DC pulse wave. Additionally, the
desired solution viscosity and pH were achieved using less than 1 ml of buffer solution. Adjustment of sample
conductivity, which is driven by sample fluid volume, remains an open area of research.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.