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Search Publications by: Steven D. Hudson (Fed)

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Displaying 76 - 99 of 99

Dynamics of Wormlike Micelles in Elongational Flows

January 1, 2006
Author(s)
Philip A. Stone, Paul Dalhaimer, Dennis E. Discher, Eric J. Amis, Steven D. Hudson, Kalman D. Migler
Micelles formed of amphiphilic diblock copolymers may have applications in drug delivery and in understanding the physics of biological structures. Wormlike micelles, in particular, provide an opportunity to study the behavior of semiflexible rods in

The Influence of Clay and Elastomer Concentration on the Morphology and Fracture Energy in Preformed Acrylic Rubber Dispersed Clay Filled Epoxy Nanocomposites

November 1, 2005
Author(s)
G Balakrishnan, P R. Start, D T. Raghavan, Steven Hudson, D Yebassa
The influence of toughener and clay concentration on the morphology and mechanical properties of three-phase, rubber-modified epoxy nanocomposites was studied. Nanocomposite samples were prepared by adding octadecyl ammonium ion exchanged clay to a

Microfluidic interfacial tensiometry

August 17, 2005
Author(s)
Steven D. Hudson, J Cabral, Kathryn L. Beers, W Goodrum, Eric J. Amis
A microfluidic approach to measure interfacial tension of immiscible fluids rapidly is reported. This method rests upon quantitative real-time analysis of two-phase flow and drop-shape dynamics. Drops of prescribed dimension and spacing are produced

Microfluidic Interfacial Tensiometry

August 1, 2005
Author(s)
Steven D. Hudson, J Cabral, Wenhua Zhang, Jai A. Pathak, Kathryn L. Beers
Immiscible fluids find diverse applications, yet their interfacial tension σ remains a fundamental property that governs their performance. Therefore, accurate and efficient methods to measure interfacial tension facilitate development and refinement of

Colloidal Particles Coated and Stabilized by DNA-Wrapped Carbon Nanotubes

January 1, 2005
Author(s)
Erik K. Hobbie, Barry J. Bauer, J S. Stephens, Matthew Becker, P M. McGuiggan, Steven Hudson, Haonan Wang
Single-walled carbon nanotubes (SWNTs) are dispersed in water via wrapping with short segments of single-stranded DNA (ssDNA). Small-angle neutron scattering suggests that the aqueous SWNT suspensions are only marginally stable, and we exploit this to make

Helical Porous Protein Mimics

August 12, 2004
Author(s)
Virgil Percec, A E. Dulcey, Y Miura, U Edlund, V S. Balagurusamy, Steven Hudson, Paul A. Heiney, H Duan, S N. Magonov
Pore forming proteins, peptides and their remodeled structures perform a diversity of biological and biologically inspired functions. They include viral helical coats,1 transmembrane channels2,3, mediated protein folding4 and reversible encapsulation5

Flow Simulation of a Microfluidic Analog of the Four-Roll Mill

March 1, 2004
Author(s)
Frederick R. Phelan Jr., Steven Hudson
The fluid dynamics of channel geometries for liquid state materials characterization in microfluidic devices are investigated using finite element flow simulation and flow classification criteria. A pressure driven microchannel device is sought that has an

Microfluidic Analogue of the 4-Roll Mill

January 1, 2004
Author(s)
Steven D. Hudson, Frederick R. Phelan Jr., Matthew D. Handler, J Cabral, Kalman D. Migler, Eric J. Amis
Microfluidic technology promises to revolutionize analytical (bio)chemistry, because molecular separations are faster, less expensive and more efficient than in traditional large scale equipment. Materials and complex-fluid sciences can likewise benefit

The Effect of Surfactant on the Efficiency of Shear-Induced Drop Coalescence

January 1, 2003
Author(s)
Steven D. Hudson, A M. Jamieson, B Burkhart
Shear-induced drop coalescence efficiency e is measured by in situ videomicroscopy of emulsions of poly(propylene glycol) and poly(ethylene glycol), with poly(ethyleneglycol-b-propyleneoxide-b-ethyleneglycol) block copolymer surfactant. Sorption of

Wall Migration and Shear-Induced Diffusion of Fluid Droplets in Emulsions

January 1, 2003
Author(s)
Steven D. Hudson
The spatial distribution of drops in multiphase flow through narrow passages is analyzed theoretically and experimentally. In simple shear between two plates, drops migrate away from the walls and concentrate towards the center of the gap. At steady state

Solvophobically Driven Self-Assembly of Chiral Supramolecular Dendrimers

December 1, 2002
Author(s)
Virgil Percec, A E. Dulcey, Y Miura, U Edlund, V S. Balagurusamy, Steven Hudson, H Duan, Paul A. Heiney
The self assembly in dilute solution of chiral supramolecular dendrimers is investigated by circular dichroism (CD) spectroscopy. These results are compared with analysis of the bulk state by CD spectroscopy x-ray diffraction electron diffraction and

Layered Droplet Microstructures in Sheared Emulsions: Finite-Size Effects

November 1, 2002
Author(s)
Jai A. Pathak, M C. Davis, Steven D. Hudson, Kalman D. Migler
We investigate the influence of confinement on the steady state microstructure of emulsions sheared between parallel plates, in a regime where the average droplet dimension is comparable to the gap width between the confining walls. Utilizing droplet

Self-Organization of Supramolecular Helical Dendrimers Into Complex Electronic Materials

September 1, 2002
Author(s)
Virgil Percec, A Rapp, Hans -. Spiess, Steven Hudson, H Duan, M Glodde, T K. Bera, Y Miura, I Shiyanovskaya, K D. Singer, V S. Balagurusamy, Paul A. Heiney, I Schnell
The discovery of electrical conduction in organic crystals and polymers has widened the range of potential optoelectronics materials, provided these exhibit sufficiently high charge carrier mobilities and are easy to make and process. Organic single

Structure Formation in Micro-Confined Polymeric Emulsions

August 1, 2002
Author(s)
Jai A. Pathak, Steven D. Hudson, Kalman D. Migler
Application of a shear field to a concentrated emulsion induces a complex spatial and temporal response. The behavior of a concentrated system is treated as an extrapolation of the well-understood behavior of isolated droplets (or of the behavior of two