Ms. Mona Rahbar Profile

Mona Rahbar

at Simon Fraser Univ

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Publications (3)

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Proceedings Article | 16 April 2014 Paper

Flexible touchpads based on inductive sensors using embedded conductive composite polymer

A. Rahbar, M. Rahbar, B. Gray

Proceedings Volume 9060, 90600O (2014) https://doi.org/10.1117/12.2044342

KEYWORDS: Sensors, Inductance, Polymers, Composites, Polymeric sensors, Switches, Fabrication, Electronics, Magnetic sensors, Optical lithography

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We present the design, fabrication, and preliminary testing of a flexible array of sensor switches intended for applications in wearable electronics and sensor systems. The touch pad sensor arrays feature flexible printed circuit board (flexible PCB) substrates and/or flexible conductive composite polymer (CCP) structures, resulting in highly flexible switch arrays. Each switch consists of 4 elements: fascia, target, spacer and a sensor coil. The user presses the fascia, bringing the target in contact with the sensor coil. Any change in the position of the target changes the coil inductance due to the generation of eddy currents, which are detected by an electronic circuit and custom software. Contact between the target and coil also measurably changes the inductance of the coils. Different sizes and geometries (square, circular, hexagonal and octagonal) of coils in both flexible PCB metal (copper) and CCP were investigated to determine which couple best with the CCP that forms the target for the inductive coils. We describe techniques for patterning two-layer inductive coils on flexible PCBs. Using this process, we demonstrate coil trace thicknesses of 200 micrometers. We also present a new low cost microfabrication technique to create inductive flexible coils using embedded CCP in polydimethylsiloxane (PDMS) as an alternative to flexible PCB metal coils. We further describe an electronic circuit that accurately measures inductances as low as 500 nH that is used to detect the change in the inductance of a sensor’s coil when the user presses the target element of the sensor. The inductance for a sensor composed of CCP square coils and CCP target was measured to be approximately 35 μH before being pressed. When pressed, the inductance dropped to 3.8 μH, a change which was easily detected.

Proceedings Article | 6 March 2014 Paper

High-aspect ratio magnetic nanocomposite polymer cilium

M. Rahbar, H. Tseng, B. Gray

Proceedings Volume 8976, 89760D (2014) https://doi.org/10.1117/12.2040662

KEYWORDS: Magnetism, Microfluidics, Polymers, Fabrication, Nanocomposites, Lab on a chip, Chemical analysis, Particles, Chemical elements, Ferromagnetics

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This paper presents a new fabrication technique to achieve ultra high-aspect ratio artificial cilia micro-patterned from flexible highly magnetic rare earth nanoparticle-doped polymers. We have developed a simple, inexpensive and scalable fabrication method to create cilia structures that can be actuated by miniature electromagnets, that are suitable to be used for lab-on-a chip (LOC) and micro-total-analysis-system (μ-TAS) applications such as mixers and flow-control elements. The magnetic cilia are fabricated and magnetically polarized directly in microfluidic channels or reaction chambers, allowing for easy integration with complex microfluidic systems. These cilia structures can be combined on a single chip with other microfluidic components employing the same permanently magnetic nano-composite polymer (MNCP), such as valves or pumps. Rare earth permanent magnetic powder, (Nd_0.7Ce_0.3)_10.5Fe_83.9B_5.6, is used to dope polydimethylsiloxane (PDMS), resulting in a highly flexible M-NCP of much higher magnetization and remanence [1] than ferromagnetic polymers typically employed in magnetic microfluidics. Sacrificial poly(ethylene-glycol) (PEG) is used to mold the highly magnetic polymer into ultra high-aspect ratio artificial cilia. Cilia structures with aspect ratio exceeding 8:0.13 can be easily fabricated using this technique and are actuated using miniature electromagnets to achieve a high range of motion/vibration.

Proceedings Article | 18 February 2010 Paper

Patterning of PMMA microfluidic parts using screen printing process

Aminreza Ahari Kaleibar, Mona Rahbar, Marius Haiducu, Ash Parameswaran

Proceedings Volume 7593, 75930E (2010) https://doi.org/10.1117/12.841345

KEYWORDS: Microfluidics, Polymethylmethacrylate, Printing, Optical lithography, Image processing, Computer aided design, Deep ultraviolet, Ultraviolet radiation, Lamps, Etching

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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.

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