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Search Publications by: Kathryn L. Beers (Fed)

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Displaying 51 - 75 of 98

Raman Spectroscopic Monitoring of Droplet Polymerization in a Microfluidic Device

September 1, 2006
Author(s)
Susan E. Barnes, Zuzanna T. Cygan, Kathryn Beers, Eric J. Amis, Jesse K. Yates
Thiolene based microfluidic devices were used to generate droplets of benzyl methacrylate monomer and hexanediol dimethacrylate crosslinker mixtures suspended in a water/surfactant continuous phase. A gradient of droplet composition was established and the

Controlled Radical Polymerization in Confined Spaces

August 21, 2006
Author(s)
Kathryn L. Beers
Advanced polymeric materials in applications as diverse as tissue engineering, electronics and personal care products require superior control of a wide range of properties. From molecular properties such as molar mass and chain composition, to the

Solution and Surface Composition Gradients via Microfluidic Confinement: Fabrication of a Statistical-Copolymer-Brush Composition Gradient

June 6, 2006
Author(s)
Chang Xu, Susan E. Barnes, Tao Wu, Daniel A. Fischer, Dean M. DeLongchamp, J Batteas, Kathryn L. Beers
A simple method to generate solution gradients through microfluidic confinement is described. The solution gradient inside a microchannel was formed by varying the relative infusion rates of two solutions that differed in compositions. The establishment

High Throughput Microfluidic Light Scattering for Aqueous Polymer Solutions

March 10, 2006
Author(s)
A I. Norman, Wenhua Zhang, Kathryn L. Beers, Eric J. Amis
A small-angle light scattering (SALS) apparatus, coupled with a specially designed microfluidic device was used, to monitor the structure of a diblock copolymer in aqueous solution. The closed-face design was fabricated between glass slides using a UV

Surface-Grafted Block Copolymer Gradients: Effect of Block Length on Solvent Response

September 1, 2005
Author(s)
Chang Xu, Tao Wu, J Batteas, Charles M. Drain, Kathryn L. Beers, Michael J. Fasolka
We outline a method to fabricate gradient combinatorial libraries that explore architectural parameters in surface-grafted block copolymers (BCs). In addition, we demonstrate the utility of such libraries for the rapid, thorough assessment of the response

Microfluidic Platform for Combinatorial Measurements of Polymer Particles

August 28, 2005
Author(s)
Zuzanna T. Cygan, Susan E. Barnes, Kathryn L. Beers, Eric J. Amis
Organic-stable microfluidic devices are used for combinatorial measurements of polymerization reactions on chip. Formulation, processing, and measurement are combined on one chip device for the generation of combinatorial polymer libraries. A monomer /

Spectroscopic Monitoring of Polymerization in Microfluidic Channels

August 28, 2005
Author(s)
Susan E. Barnes, Anthony J. Bur, Zuzanna T. Cygan, Kathryn Beers, Eric J. Amis
At NIST Combinatorial Methods Center (NCMC) we are interested in the construction of material libraries that explore a range of polymer chemistries and properties. In this study we extend on-chip application of spectroscopic techniques to the analysis of

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

ATRP in Microchannels

August 1, 2005
Author(s)
Kathryn L. Beers, Tao Wu, Chang Xu
The range of accessible well-defined synthetic polymers expanded dramatically with the discovery of atom transfer radical polymerization (ATRP). In fact, there are so many options for variations of block, statistical and gradient copolymers, not to mention

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

Manipulating Cell Adhesion on Gradient Poly(2-Hydroxyethyl Methacrylate)-Grafted Surfaces

April 1, 2005
Author(s)
Ying Mei, Tao Wu, Chang Xu, K J. Langenbach, John T. Elliott, B D. Vogt, Kathryn L. Beers, Eric J. Amis, N Washburn
In this study, a simple and versatile method was developed to prepare the low grafting density initaitor gradient, which was combined with surface initiated atom transfer radical polymerizations (ATRP) to produce a well defined poly(2-hydroxyethyl

Microfluidic Platform for the Generation of Organic-Phase Microreactors

April 1, 2005
Author(s)
Zuzanna T. Cygan, J Cabral, Kathryn L. Beers, Eric J. Amis
Rapid prototyping photolithography of a thiolene based resin was used to fabricate microfluidic devices stable to aliphatic and aromatic organic solvents. The swelling of the thiolene resin in various organic solvents was quantified and the solvent