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Search Publications by: Steven D. Hudson (Fed)

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Displaying 51 - 75 of 99

MEMS Parallel Plate Rheometer for Oscillatory Shear Micro Rheology Measurements

December 11, 2009
Author(s)
Gordon Christopher, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Growing numbers of applications including proteomics, cosmetics, and thin film coatings use novel viscoelastic materials that derive their rheological properties from micro scale structure created by the inclusion of long chain molecules, nano particles

Mass transfer in two-phase microchannel flows

November 4, 2009
Author(s)
Jeffrey D. Martin, Steven D. Hudson
Drop-based microfluidic devices are becoming more common and molecular mass transfer and drop circulation are issues that affect the performance of such devices. Moreover, interfacial properties and surfactant mass transfer rates govern emulsion behavior

Poiseuille flow and drop circulation in microchannels

October 29, 2009
Author(s)
Steven D. Hudson
Microfluidics aims to control precisely the transport of fluids and suspended particles or drops. Here we calculate two characteristics of interest in rectangular microchannels, as a function of the cross-sectional aspect ratio. First, we present a

Interfacial Rheology in Complex Flow

August 23, 2009
Author(s)
Jeffrey D. Martin, Steven Hudson
Typical methods used to measure dynamic interfacial properties of multiphase liquid systems often employ drops that are much larger and flows that are much simpler than those encountered in typical processing applications. A microfluidic approach is used

Polyelectrolyte and Particle Adsorption to Nanopatterned Surfaces

August 23, 2009
Author(s)
Steven D. Hudson, Thuy Chastek
The adsorption of polyelectrolytes and nanoparticles onto patterned and curved surfaces is investigated (by fluorescence and electron microscopy) and exploited to produce anisotropic patchy particles. Various anisotropic properties are necessary for the

Differences in PDMS Modification Affect Laminin Deposition and Smooth Muscle Cell Response

August 16, 2009
Author(s)
Joy P. Dunkers, Hae-Jeong Lee, Marvi Matos, Lisa Pakstis, Juan M. Taboas, Steven D. Hudson, Marcus T. Cicerone
When culturing cells on flexible surfaces, it is important to consider extracellular matrix treatments that will remain on the surface under mechanical strain. Here we investigate differences in laminin surfaces that were deposited on oxidized PDMS (plasma

Microscale Polymer-Nanotube Composites

July 2, 2009
Author(s)
Erik K. Hobbie, Jeffrey A. Fagan, Jan Obrzut, Steven D. Hudson
Microscopic polymer colloids with an interfacial coating of purified single-wall carbon nanotubes (SWCNTs) have been synthesized from length and type sorted SWCNTs. Aqueous SWNCT suspensions sorted through density-gradient ultracentrifugation are used to

Preparation and Characterization of Patchy Particles

November 14, 2008
Author(s)
Thuy Chastek, Steven D. Hudson, Vincent A. Hackley
The self-assembled organization of partilces depends on the symmetry of their interactions, and strides are being made in producing nanoaparticles of controlled shape and functionalization. This paper describes the use of particles adsorption to control

Organic single crystal field-effect transistors of a soluble anthradithiophene

October 22, 2008
Author(s)
Oana Jurchescu, Sankar Subramanian, R J. Kline, Steven D. Hudson, John E. Anthony, Thomas Jackson, David J. Gundlach
We use single crystals (grown by physical vapor transport) of a soluble oligomer to obtain a better understanding of the intrinsic properties, limitations and potential of these materials. Single crystals are well-suited for studies exploring the effects

Hollow spherical supramolecular dendrimers

October 1, 2008
Author(s)
Virgil Percec, Mihai Peterca, Andres E. Dulcey, Mohammad Imam, Steven Hudson, Sami Nummelin, Peter Adelman, Paul A. Heiney
The synthesis of a library containing 12 conical dendrons that self-assemble into hollow spherical supramolecular dendrimers is reported. The design principles for this library were accessed by development of a method that allows the identification of

Diffusive and convective mass transfer in two-phase flow in microchannels

August 3, 2008
Author(s)
Steven D. Hudson, Jai A. Pathak, Jeffrey D. Martin
The kinetics of mass transfer from one phase to another is monitored in flow. The time-dependent interfacial tension between water and oil (determined from drop deformation dynamics in situ) serves as a measure of the butanol concentration within the drop

Osteocyte Enhancement of Angiogenesis In Vitro

February 14, 2007
Author(s)
Erica Takai, Juan M. Taboas, Rocky Tuan, Steven D. Hudson
It is well known that an intimate relationship exists between vascularization and bone formation during development and fracture healing, where new bone formation is preceded by local vascularization. A recent rat exercise model has demonstrated that

Encapsulated Chondrocyte Response to Pulsatile Flow Bioreactor

August 16, 2006
Author(s)
James A. Cooper, W Li, L A. Bailey, Steven D. Hudson, Sheng Lin-Gibson, Kristi S. Anseth, Rocky Tuan, N Washburn
We have developed a bioreactor using microfluidic techniques that allow for dynamic culture conditions and measurement of the fluid flow impinging upon a three-dimensional (3-D) tissue engineering (TE) scaffold. Chondrocytes in scaffolds have been shown to

Mirofluidic Appproach for Rapid Interfacial Tensiometry

February 1, 2006
Author(s)
J Cabral, Steven Hudson
We report a microfluidic instrument to rapidly measure the interfacial tension of multi-component immiscible liquids. The measurement principle rests upon the deformation and retraction dynamics of drops under extensional flow and was implemented in

Breakup of Carbon Nanotube Flocs in Microfluidic Traps

January 1, 2006
Author(s)
P R. Start, Steven Hudson, Erik K. Hobbie, B MiglerKalman
The critical stress to break flocs of multiwalled-carbon nanotubes suspended in low-molecular-weight polymer fluid is measured in planar elongational flow. Through image analysis of aggregates and their fragments, the extension rate of the flow and the