Mr. Ali Asgar S. Bhagat Profile

Ali Asgar S. Bhagat

Graduate Research Assistant at Univ of Cincinnati

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Publications (7)

Proceedings Article | 13 February 2008 Paper

Evaluation of passive planar microfluidic devices for mixing of particle flows

Ali Asgar S. Bhagat, K. Teal Wurm, Ian Papautsky

Proceedings Volume 6886, 68860W (2008) https://doi.org/10.1117/12.767347

KEYWORDS: Particles, Microfluidics, Diffusion, Lab on a chip, Microfluidic imaging, Performance modeling, Data modeling, Proteins, Ultrasonics, Molecules

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Proceedings Article | 13 February 2008 Paper

Spiral microfluidic nanoparticle separators

Ali Asgar S. Bhagat, Sathyakumar S. Kuntaegowdanahalli, Dionysios D. Dionysiou, Ian Papautsky

Proceedings Volume 6886, 68860M (2008) https://doi.org/10.1117/12.767350

KEYWORDS: Particles, Microfluidics, Nanoparticles, Luminescence, Atmospheric particles, Manufacturing, Blood, Plasma, Medicine, Electronics

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Proceedings Article | 22 January 2007 Paper

A simple planar micromixer with low-pressure drop for disposable lab-on-a-chip (LOC) systems

Ali Asgar Bhagat, Erik T. K. Peterson, Ian Papautsky

Proceedings Volume 6465, 64650A (2007) https://doi.org/10.1117/12.698370

KEYWORDS: Microfluidics, Lab on a chip, Semiconducting wafers, Diffusion, Glasses, Biological research, Microscopes, Luminescence, Photoresist materials, Plasma

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Proceedings Article | 22 January 2007 Paper

Simple passive micromixer using recombinant multiple flow streams

Joon Sub Shim, Irena Nikcevic, Michael Rust, Ali Asgar Bhagat, William Heineman, Carl Seliskar, Chong Ahn, Ian Papautsky

Proceedings Volume 6465, 64650Y (2007) https://doi.org/10.1117/12.701977

KEYWORDS: Microfluidics, Lab on a chip, Semiconducting wafers, Protactinium, Glasses, Diamond, Computational fluid dynamics, Fluid dynamics, Resistance, Silicon

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Proceedings Article | 23 January 2006 Paper

Characterization of SU-8 optical multimode waveguides for integrated optics and sensing on microchip devices

A. Piruska, A. A. Bhagat, K. Zhou, E.T.K. Peterson, I. Papautsky, C. Seliskar

Proceedings Volume 6112, 611207 (2006) https://doi.org/10.1117/12.655667

KEYWORDS: Waveguides, Refractive index, Prisms, Signal attenuation, Metals, Optical properties, Ellipsometry, Integrated optics, Microfluidics, Chemical analysis

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Our research group is interested in environmental sensing of heavy metals that are involved in pollution of aqueous environments. As a result, we are developing chemical sensors within integrated microfluidic systems for sensitive and selective detection of these pollutants. Our approach is to combine established chemical sensing strategies with microfluidic structures, especially in plastic devices, to achieve a total heavy metal analysis system. In this regard, the combination of three complementary techniques - optical waveguide spectroscopy, electrochemistry and chemical partitioning offers the required selectivity and sensitivity essential for many environmental samples. On-chip optical waveguide spectroscopy promises to yield the necessary high sensitivity but relies on fabrication of optical structures with a material of appropriate refractive index, optical quality, and chemical stability by methods consistent with established fabrication methods. SU-8, the epoxy-based negative photoresist, appears to satisfy these requirements and, thus, has become one of our candidate materials for waveguide fabrication on plastic microchips. Although the SU-8 has been previously used for waveguide fabrication, its optical properties and more specifically the influence of processing conditions on resultant optical properties have not been thoroughly characterized. This work presents an evaluation of SU-8-based multimode waveguides on glass and plastic substrates. Optical constants of waveguides have been characterized by spectroscopic ellipsometric and prism coupling techniques. Additionally, using the latter method, evaluation of propagation losses of various structures with different thicknesses has been made. Ellipsometric and prism coupling measurements gave comparable refractive indices for variously cured SU-8 waveguide materials. Prism coupling analyses proved to be more useful for analysis of the many SU-8 waveguide structures fabricated in the thickness range of 5 to 75 μm.

Proceedings Article | 23 January 2006 Paper

Passive micromixer with break-up obstructions

Ali Asgar Bhagat, Erik Peterson, Ian Papautsky

Proceedings Volume 6112, 61120J (2006) https://doi.org/10.1117/12.648150

KEYWORDS: Microfluidics, Lab on a chip, Semiconducting wafers, Diffusion, Performance modeling, Lithography, Diamond, Photoresist materials, Microscopes, Data modeling

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Proceedings Article | 22 January 2005 Paper

Passive micromixer with obstructions for lab-on-a-chip applications

Ali Asgar Bhagat, Gabriel Dagani, Erik Peterson, Jin-Hwan Lee, Ian Papautsky

Proceedings Volume 5718, (2005) https://doi.org/10.1117/12.591766

KEYWORDS: Semiconducting wafers, Lab on a chip, Diamond, Microfluidics, Photoresist materials, Diffusion, Wafer bonding, Silicon, Chemistry, Control systems

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Showing 5 of 7 publications

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