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Displaying records 11 to 20 of 227 records.
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11. NMR Characterization of the Formation Kinetics and Structure of Di-O-Benzylidene Sorbitol Gels Self-Assembled in Organic Solvents
Published: 1/19/2011
Authors: David Lloyd VanderHart, Jack F Douglas, Steven D Hudson, Joseph M Antonucci, Elizabeth A Wilder
Abstract: 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 st ...

12. Thermally-Reversible Surface Morphology Transition Between Cylinders and Spheres in Thin Diblock Copolymer Films
Published: 7/28/2010
Authors: Xiaohua Zhang, Kevin G. Yager, Jack F Douglas
Abstract: Many phase transitions exhibit ordering transitions at the boundary of the material that are distinct from the interior where the intermolecular interactions can be significantly different. The present result considers the existence of a reversible s ...

13. Dynamic light scattering investigations of nanoparticle aggregation following a light-induced pH jump
Published: 5/19/2010
Authors: Ryan Murphy, Denis Pristinski, Kalman D Migler, Jack F Douglas, Vivek M Prabhu
Abstract: We use dynamic light scattering to characterize the kinetics of nanoparticle aggregation. The aggregation process was conveniently initiated in photoacid generator (PAG) solutions where changes in the pH of the solution can be controlled by exposure ...

14. Wrinkling and Strain Softening in Single-Wall Carbon Nanotube Membranes
Published: 3/26/2010
Authors: Erik K. Hobbie, Daneesh Olivia Simien, Jeffrey A Fagan, JiYeon Huh, Jun Y. Chung, Steven D Hudson, Jan Obrzut, Jack F Douglas, Christopher M Stafford
Abstract: Ultrathin layers of single-wall carbon nanotubes (SWCNTs) show considerable promise for applications ranging from fuel-cell membranes and biochemical sensors to bioactive films and transparent electrodes. The high conductivity and extreme anisotropy ...

15. Relaxation and antiplasticization measurements in trehalose-glycerol mixtures; a model formulation for protein preservation
Published: 1/28/2010
Authors: Jan Obrzut, A Anopchenko, Jack F Douglas, Bert W Rust
Abstract: We utilize dielectric relaxation process for the quantitative characterization of antiplasticization of trehalose by glycerol. The high frequency Johari-Goldstein relaxation time was obtained by analyzing the complex permittivity data in terms of the ...

16. Solvent Retention In Thin Spin-Coated Polystyrene And Poly(Methyl Methacrylate) Homopolymer Films Studied By Neutron Reflectometry
Published: 1/19/2010
Authors: Xiaohua Zhang, Kevin G. Yager, Shuhui Kang, Nathaniel J Fredin, Bulent Akgun, Sushil K. Satija, Jack F Douglas, Alamgir Karim, Ronald Leland Jones
Abstract: We utilize neutron reflectometry (NR) to probe the amount of residual solvent inside thin polystyrene (PS) and poly(methyl methacrylate) (PMMA) films spin-coated from deuterated toluene polymer solutions onto silicon substrates . The effect of therma ...

17. Capillary Instability in Nanoimprinted Polymer Films
Published: 5/21/2009
Authors: Kyle J. Alvine, Yifu Ding, Hyun Wook Ro, Brian C. Okerberg, Alamgir Karim, Christopher Soles, Jack F Douglas
Abstract: Capillary forces play an active role in defining the equilibrium structure of nanoscale structures. This effect can be especially pronounced in soft materials such as polymers near or above their glass transition temperatures where material flow is ...

18. Grain boundaries exhibit the dynamics of glass-forming liquids
Published: 5/12/2009
Authors: James A Warren, Jack F Douglas, Hao Zhang, David J Srolovitz
Abstract: Polycrystalline materials are composites of crystalline particles or grains separated by thin amorphous grain boundaries (GBs). Although GBs have been exhaustively investigated at low temperatures, at which these regions are relatively ord ...

19. Equilibrium Polymerization Models of Reentrant Self-Assembly
Published: 4/24/2009
Authors: Jacek Dudowicz, Jack F Douglas, Karl Freed
Abstract: As is well known, liquid-liquid phase separation can occur either upon heating or cooling, corresponding to lower and upper critical solution phase boundaries, respectively. Likewise, self-assembly transitions from a monomeric state to an organized ...

20. Dielectric Spectroscopy Investigation of Relaxation in C60-Polyisoprene Nanocomposites
Published: 3/23/2009
Authors: Yifu Ding, Sebastian Pawlus, Alexei Sokolov, Jack F Douglas, Alamgir Karim, Christopher Soles
Abstract: We investigate the influence of adding C60 nanoparticles on the dielectric relaxation spectra of both unentangled and entangled polyisoprene (PIP). Relaxation modes corresponding to both segmental and chain relaxation were analyzed over a broad tempe ...

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