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Search Publications by: Steven D. Hudson (Fed)

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Displaying 76 - 100 of 203

Self-Repairing Complex Helical Columns Generated via Kinetically Controlled Self-Assembly of Dendronized Perylene Bisimides

November 16, 2011
Author(s)
Virgil Percec, Steven Hudson, Mihai Peterca, Pawaret Leowanawat, Emad Aqad, Robert Graf, Hans -. Spiess, Xiangbing Zeng, Goran Ungar, Paul A. Heiney
The dendronized perylene 3,4:9,10-tetracarboxylic acid bisimide (PBI) (3,4,5)12G1-3-PBI was recently shown to self-assemble in a complex helical column containing tetramers of PBI as the basic repeat unit. The tetramers contain a pair of two molecules

Self-Assembly of Dendronized Perylene Bisimides into Complex Helical Columns

June 24, 2011
Author(s)
Virgil Percec, Mihai Peterca, Timur Tadjiev, Xiangbing Zeng, Goran Ungar, Pawaret Leowanawat, Emad Aqad, Mohammad Imam, Brad Rosen, Umit Akbey, Robert Graf, Sivakumar Sekharan, Daniel Sebastiani, Hans -. Spiess, Paul A. Heiney, Steven Hudson
The synthesis of perylene 3,4:9,10-tetracarboxylic acid bisimides (PBIs) dendronized with first generation dendrons containing 0 to 4 methylenic units (m) between the imide group and the dendron, (3,4,5)12G1-m-PBI, is reported. Structural analysis of their

Differences in Polydimethylsiloxane Modification Methods Affect Laminin Deposition and Smooth Muscle Cell Proliferation

April 13, 2011
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

Interfacial effects on droplet dynamics in Poiseuille flow

April 12, 2011
Author(s)
Jonathan T. Schwalbe, Frederick R. Phelan Jr., Petia Vlahovska, Steven D. Hudson
Interfacial rheology governs many properties of emulsions, and here we report theory that accounts for and measure surface viscous and elastic forces. Stokes flow is assumed in bulk phases and a jump in hydrodynamic stress at the interface is balanced by

Flexure-induced structural and electronic changes in polymer supported membranes of length purified single-wall carbon nanotubes

February 22, 2011
Author(s)
John M. Harris, Ganjigunte R. Iyer, Daneesh O. Simien, Jeffrey Fagan, JiYeon Huh, Jun Y. Chung, Steven Hudson, Jan Obrzut, Jack F. Douglas, Christopher Stafford, Erik K. Hobbie
Thin membranes of length purified single-wall carbon nanotubes (SWCNTs) are uniaxially compressed by depositing them on prestretched polymer substrates. Upon release of the strain, the topography, microstructure and conductivity of the films are

Controlling the Microstructure of Solution-Processible Small Molecules in Thin-Film Transistors through Substrate Chemistry

February 4, 2011
Author(s)
Regis J. Kline, Steven D. Hudson, Xinran Zhang, David J. Gundlach, Andrew Moad, Lee J. Richter, Oana Jurchescu, Thomas Jackson, Sanker Subramanian, John E. Anthony, Michael F. Toney
Solution-processible small molecules have tremendous potential for providing both high charge carrier mobility and low cost processing. This study outlines a detailed microstructural study of the effect of substrate chemistry on fluorinated 5,11-bis

NMR Characterization of the Formation Kinetics and Structure of Di-O-Benzylidene Sorbitol Gels Self-Assembled in Organic Solvents

January 19, 2011
Author(s)
David L. VanderHart, Jack F. Douglas, Steven Hudson, Joseph M. Antonucci, Elizabeth A. Wilder
The molecule 1,3:2,4-Di-O-Benzylidene sorbitol (DBS) is a common gelator that forms thermally reversible gels in diverse organic solvents. Solid state 13C and proton NMR techniques, along with electron microscopy, are utilized in an exploratory study of

Controlled in situ Nanocavitation in Polymeric Materials

January 18, 2011
Author(s)
Yajun Cheng, Joseph M. Antonucci, Steven Hudson, Nancy Lin, Xinran Zhang, Sheng Lin-Gibson
A new strategy to produce polymer-inorganic composites with ultra low volume shrinkage has been developed. Small amount of cavitation agent, acetone dicarboxylic acid (ADCA), was introduced into acrylate-glass composites and decomposed in situ to carbon

Microfluidics Measurements of Interfacial Rheology

January 18, 2011
Author(s)
Jeffrey D. Martin, Joie N. Marhefka, Kalman D. Migler, Steven D. Hudson
The bulk properties and structural characteristics of emulsions arise substantially from their interfacial rheology, which depends strongly on surfactant mass transfer and its coupling to flow. Typical methods used to measure such properties often employ

Mapping Crystal Orientation in High Performance Thienothiophene Copolymer Thin Films

December 8, 2010
Author(s)
Xinran Zhang, Steven D. Hudson, Dean M. DeLongchamp, David J. Gundlach, Martin Heeney, Iain McCulloch
Mapping of crystalline grain orientation for solution-processed semiconducting polymer thin films is key to understanding charge transport in electronic devices based on them and yet challenging. In this work, a high mobility thienothiophene copolymer

Development of a MEMS based Dynamic Rheometer

August 31, 2010
Author(s)
Gordon Christopher, Jae M. Yoo, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Rheological methods that interrogate nano-liter scale volumes of fluids and solids have advanced considerably over the past decade, yet there remains a need for methods that probe the frequency dependent complex rheological moduli through application of