Lewis Group

Name Jennifer Lewis

Bok Yeop Ahn
Korea University, Ph.D

Scott Slimmer
University of Illinois, Urbana-Champaign, Ph.D

My research focuses on conformal printing of electrically small antennas on three-dimensional surfaces. I use omnidirectional printing of metallic nanoparticle inks to fabricate three-dimensional antennas that are smaller than the wavelength at their operating frequency. The results of this project may be relevant to the design and fabrication of new antennas and compact wireless devices that would improve the quality of data transmission in numerous applications. This research is a collaborative effort with Prof. Jennifer Bernhard's group in the Department of Electrical and Computer Engineering here at Illinois.
Yongxiang Gao
McGill University, Ph.D

I am interested in the phase behavior, structure, dynamics and rheology of colloidal rod suspensions with tunable rod aspect ratios and interactions. Rod-shape particles are important in many practical applications, such as high-tech ink design and paper industry. Due to their elongated shape, they are efficient in regulating mechanical properties. They are also important for their own sake because they can serve as model systems to understand fundamental physics of hard rods with or without attraction, such as equilibrium isotropic fluid to liquid crystals transitions and non-equilibrium glass and gel transitions.
Jaime Juarez
Johns Hopkins University, Chemical and Biomolecular Engineering, Ph.D

I study the assembly of anisotropic colloids and microfluidics for encapsulation.

Graduate students
David Lorang
Georgia Institute of Technology, BS

I work on expanding direct-write capability in the area of simultaneous patterning of multiple inks, enabling the creation of novel structures and composites. I have applied this technique to the creation of optical waveguides from photo-curable Newtonian fluids through the use of a fugitive viscoelastic shell. I am also studying the behavior of concentric two-phase flow in different fluid systems.
Brett Walker
Oklahoma State University, BS

Analisa Russo
Massachusetts Institute of Technology, BS

I make low-temperature conductive silver inks for direct writing of circuits onto flexible substrates. I work with Ashley on constructing large area devices on polyimide using Direct Ink Writing. I also work on drawing unique electronic devices on paper by rollerball pen, and co-authored a paper on this technology with Bok. Currently, I am studying the properties of functional particle-based inks that make them suitable for drawing with handheld tools.
Lucas Osterbur
Hope College, BS

John Vericella
University of Illinois, Urbana-Champaign, BS

Aaron Chan
University of Illinois, Urbana-Champaign, BS

David Kolesky
University of Florida, Materials Science and Engineering, BS

I am currently working on creating micro-energetic materials with tailored architectures via direct ink writing (DIW) of highly ordered oxide structures that are in-filled with a metal fuel. These composite materials are capable of releasing large amounts of stored chemical energy upon ignition. This work is in collaboration with a great team at Lawrence Livermore National Laboratory. I am also working with Steve on developing multinozzle arrays for quickly patterning parallel features over large areas.
Steve Kranz
Arizona State University, Materials Science and Engineering, BS

I use a 3-axis CNC mill to machine a bifurcating array of microfluidic channels into a PMMA block. I solvent weld this block to another piece of PMMA to create a device used to split a single stream of ink into 64 streams of equal flow. David K. and I use this device (a "multinozzle" as we call it) to extrude a fugitive viscoelastic ink in a wood-pile pattern over a large area. We fill in the voids of the printed structure with epoxy, cure the epoxy, and remove the original fugitive ink.
Ashley Gupta
University of Illinois, Urbana-Champaign, BS

I work on a DARPA funded project with Analisa on the direct-write assembly of metallic interconnects for photovoltaic concentrator arrays. The device our collaborators are making is a rollable solar cell array composed of all flexible and lightweight materials. Our role is to integrate the printing of conductive patterns between the patches of Indium Gallium Phosphide photovoltaic cells to wire the 4x4" device.
Kundan Chaudhary
Illinois Wesleyan University, Physics, BS

I study the behavior of anisotropic colloidal particles in electric fields.
Teng-Sing (Sean) Wei
University of Illinois, Urbana-Champaign, BS

Bethany Glesner
University of Michigan, Materials Science and Engineering, BS

I am developing metallic inks and manufacturing methods to produce electronic components on flexible substrates quickly and accurately. With high-throughput printing all aspects of the system including ink chemistry, deposition method, and substrate preparation need to be optimized for precise and efficient features.
Josh Grolman
University of Massachusetts, BS

Our goal is to develop novel materials for targeted release of actives: mainly focused on macromolecular synthesis and characterization toward new, structured materials and nano-scale devices. Using microfluidic devices, we are able to possess fine control over hierarchal material composition and order, and develop materials with special 'smart' surface functionalities in a high-throughput format. It is at the interface, where much fascinating science remains to be discovered.
Dan Reilly
Penn State University, Chemical Engineering, BS

I am a graduate student pursuing a Ph.D. in chemical engineering. The main areas of my research are encapsulation and controlled release of active chemicals. I use direct write assembly to produce encapsulating filament or droplet shells that surrounds an active core. In addition, I use microfluidic systems to create emulsion droplets to serve as encapsulating agents. The materials used to encapsulate can be made of responsive chemicals that allow for a controllable release of the core.

Former group members (2001 - present)

Name Year Currently at Thesis
Chris Hansen PhD (2011) UMass Lowell Self-healing materials and multinozzle printheads with embedded microvascular networks
Elizabeth Glogowski Post-doc University of Wisconsin, Eau Claire  
Willie Wu PhD (2010) Intel Direct Ink Writing of Microvascular Networks
Adam DeConinck M.S. (2010) R Systems Fabrication, Dynamics, and Self-Assembly of Anisotropic Colloidal Particles
Sara T. Parker   Intel Direct-write assembly of 3D microperiodic scaffolds for tissue engineering applications
Rob F. Shepard   Harvard Microfluidic assembly and packing dynamics of colloidal granules
Eric Duoss   LLNL  
Jacinta Conrad Post-doc University of Houston  
Jun Yoshikawa PhD (2009) NGK Comb Polymer Architecture and Particle Size Effects on the Behavior of Biphasic Nanoparticle Inks for Direct-Write Assembly
Summer Rhodes PhD (2009) Sandia National Labs Structure, Dynamics and Flow Behavior of Model Biphasic Colloidal Mixtures
Eric Duoss PhD (2009) UIUC Sol-Gel and Nanoparticle Inks for Direct-Write Assembly of Functional Metal Oxide and Metallic Materials
Dan Harris PhD (2008) Intel Patterning Colloidal Films via Evaporative Lithography
Ranjeet Rao PhD (2007) PARC Biphasic Nanoparticl Inks for Direct Write Assembly of 3-D Periodic Structures
Mingjie Xu PhD (2007) Intel Inorganic Hybrids Templated From 3-D Polyelectrolyte Scaffolds Assembled Via Direct Ink Writing
Ketan Bhatt Post-doc
Angel Chan MD/PhD (2007) Johns Hopkins Nanoparticle Engineering of Colloidal Suspsension Behavior
Ali Mohraz Post-doc UC Irvine  
Mark Roberts M.S. (2005) BP Rheological properties and micro-particle imaging velocimetry of model colloidal fluids and gels
Greg Gratson PhD (2005) General Electric Colloidal and Polyelectrolyte Inks For Direct-Write Assembly of 3D Periodic Structures
Sarah Michna M.S. (2004)   Directed Assembly of 3-D Hydroxyapatite Scaffolds
Glen Kirby PhD (2003) Oak Ridge National Laboratory PAA/PEO Comb Polymer Effects on the Rheological Property Evolution in Concentrated Cement Suspensions
James Smay PhD (2002) Oaklahoma State University Directed Colloidal Assembly and Characterization of PZT-Polymer Composites
Carlos J. Martinez PhD (2002) Purdue Structure and Property Evolution During Film Formation From Binary Colloidal Suspensions
Valeria Tohver Milam PhD (2002) Georgia Institute of Technology Phase Behavior, Structure, and Properties of Colloidal Microsphere-Nanoparticle Mixtures
Mariusz Twardowski Post-doc MIT  
James Gilchrist Post-doc Lehigh University  
Mike Bevan Post-doc Johns Hopkins University  

Former group members (before 2001)

Kim Blackman Sherry Morisette Hiro Matsuyama
Michelle Boyer Andrea Ogden Kiochi Numata
Pryadarshi Desai Gerry Raban Osamu Sakurada
Jiyou Guo Andrew Read  
Marsha Huha Rita Slilaty  
Matthew Janet Markus Wegman