Research:
Biological microsystems and biomaterials

Programmable biopolymer deposition

We have pioneered biopolymer electrodeposition as a vehicle for spatially and temporally programmable fabrication of biofunctional sites on surfaces and in microfluidic bioMEMS devices. An amine-rich polysaccharide, chitosan, can be selectively deposited to provide an effective platform for conjugation of proteins, nucleic acids, and cells for a variety of applications, including bioprocess reactions, metabolic engineering, and biosensing.

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BioMEMS devices, process Integration, packaging, and control

We are developing bioMEMS designs to accommodate microfluidic networks, electrical activation at specific sites, and in-situ optical diagnostics through windows and integrated waveguide structures.  Our emphasis is on designs which enable robust, leak-tight, re-usable bioMEMS devices together with packaging and system control technologies. One major goal is a bioMEMS design strategy which enables multi-site, multi-step biochemical reactions for investigating metabolic engineering pathways, with application to drug discovery.  Another important goal is to capture and sustain cell metabolism for use in cell-based sensing.  The microfluidics technology has implications for directed assembly of nanosystems as well.

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Real-time and in-situ diagnostics

We are pursuing means for real-time, in-situ process monitoring in bioMEMS systems in order to expedite analyses of bioMEMS-based reaction sequences and for control of reaction systems. Primary emphasis is on optical techniques, including fluorescence and confocal imaging, microRaman and surface-enhanced Raman spectroscopy, and optical reflectivity. Mass spectrometric approaches are also under consideration.

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Selected Accomplishments

Spatially selective deposition and biofunctionalization of chitosan
DNA conjugation and reversibility on chitosan surfaces
Enzyme conjugation and catalysis on chitosan surfaces
Microfluidics device integration and packaging for bioMEMS

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Students and Postdocs

Yi Cheng (postdoc)
Jordan Betz (BIOE grad)
Omar Bekdash (BIOE undergrad)

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Collaborators

Reza Ghodssi (ECE/ISR/SSSC, UMCP)
Gregory F. Payne (UMBI-CBR)
William Bentley (BIOE, UMCP; UMBI-CBR)
Xiaolong Luo (BIOE postdoc, Bentley group)
FCS group, ITC-irst, Trento, Italy

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Support

Robert W. Deutsch Foundation
NSF Emerging Frontiers in Research and Innovation (EFRI)
CoSMIC NSF International Materials Institute
Laboratory for Physical Sciences
UMD-NSF MRSEC (seed)

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Selected Publications

" Patterned Assembly of Genetically Modified Viral Nanotemplates via Nucleic Acid Hybridization ", Hyunmin Yi, Saira Nisar, Sang-Yup Lee, Michael A. Powers, William E. Bentley, Gregory F. Payne, Reza Ghodssi, Gary W. Rubloff, Michael T. Harris, and James N. Culver, Nano Letters 5 (10), 1931-36 (2005).

" A fabrication platform for electrically mediated optically active biofunctionalized sites in BioMEMS ", Michael A. Powers, Stephan T. Koev, Arne Schleunitz, Hyunmin Yi, Vildana Hodzic, William E. Bentley, Gregory F. Payne, Gary W. Rubloff, and Reza Ghodssi, Lab on a Chip 5, 583-586 (2005).

" Biofabrication with Chitosan ", Hyunmin Yi, Li-Qun Wu, William E. Bentley, Reza Ghodssi, Gary W. Rubloff, James N. Culver, and Gregory F. Payne, review paper, Biomacromolecules 6 (6) 2881-2894 (Nov/Dec 2005).

"Signal-Directed Sequential Assembly of Biomolecules onto Patterned Surfaces", Hyunmin Yi, Li-Qun Wu, Reza Ghodssi, Gary W. Rubloff, Gregory F. Payne, and William E. Bentley, Langmuir 21 (6) 2104-2107 (Mar 15 2005).

" Thermo-Biolithography: a Technique for Patterning Nucleic Acids and Proteins ", Rohan Fernandes, Hyunmin Yi , Li-Qun Wu, Gary W. Rubloff , Reza Ghodssi , William E. Bentley, and Gregory F. Payne, Langmuir 20 (3), 906-913 (2004).

" A Robust Technique for Assembly of Nucleic Acid Hybridization Chips Based on Electrochemically Templated Chitosan ", Hyunmin Yi , Li-Qun Wu, Reza Ghodssi, Gary W. Rubloff, Gregory F. Payne, and William E. Bentley, Anal. Chem. 76 (2), 365-372 (2004).

" Integrated Fabrication of Polymeric Devices for Biological Applications ", M. J. Kastantin, S. Li, A. P. Gadre, L-Q Wu, W. E. Bentley, G. F. Payne, G. W. Rubloff, and R. Ghodssi, Sensors and Materials (invited) 15 (6), 295-311 (2003).

" Nature-inspired Creation of Protein-Polysaccharide Conjugate and its Subsequent Assembly onto a Patterned Surface ", Tianhong Chen, David A. Small, Li-Qun Wu, Gary W. Rubloff , Reza Ghodssi , Rafael Vazquez-Duhalt, William E. Bentley, and Gregory F. Payne, Langmuir 19 (22), 9382-86 (2003).

" Voltage-Programmable Biofunctionality in MEMS Environments using Electrodeposition of a Reactive Polysaccharide ", Li-Qun Wu, Hyunmin Yi , Sheng Li, David A. Small, Jung Jin Park , Gary W. Rubloff , Reza Ghodssi , William E. Bentley, and Gregory F. Payne, Proc. IEEE Transducers 2003, 1871-1874 (2003).

" Electrochemically-Induced Deposition of a Polysaccharide Hydrogel onto a Patterned Surface ", Rohan Fernandes, Li-Qun Wu, Tianhong Chen, Hyunmin Yi , Gary W. Rubloff , Reza Ghodssi , William E. Bentley , and Gregory F. Payne, Langmuir 19 (10), 4058-4062 (2003).

" Spatially Selective Deposition of a Reactive Polysaccharide Layer onto a Patterned Template ", Li-Qun Wu, Hyunmin Yi , Sheng Li, Gary W. Rubloff , William E. Bentley, Reza Ghodssi , and Gregory F. Payne, Langmuir 19 (3), 519-524 (2003).

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On this page

Programmable biopolymer deposition

BioMEMS Devices, Process Integration, Packaging, and Control

Real-time Diagnostics

Selected Accomplishments

Students

Collaborators

Support

Selected Publications

Research

Overview

Biological microsystems and biomaterials

Nanostructures and energy applications

Electronic materials and processes

Nanomanufacturing

Contact

Gary W. Rubloff
301 405-3011
office: 1128 Kim Bldg
mail: 2145 AV Williams Bldg
University of Maryland
College Park, MD 20742-3285