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Author: Jack Douglas

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1. High-speed, high-purity separation of gold nanoparticle‹DNA origami constructs using centrifugation
Published: 7/23/2014
Authors: Seung H. Ko, Luis Fernando Vargas Lara, Paul N. Patrone, Samuel M Stavis, Francis Starr, Jack F Douglas, James Alexander Liddle
Abstract: DNA origami is a powerful platform for assembling gold nanoparticle constructs, an important class of nanostructure with numerous applications. Such constructs are assembled by the association of complementary DNA oligomers. These association reactio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915009

2. Three Dimensional Cluster Distributions in Processed Multi-wall Carbon Nanotube Polymer Composites
Published: 6/25/2014
Authors: Doyoung Moon, Jan Obrzut, Jack F Douglas, Thomas Fung Lam, Krzysztof Koziol, Kalman D Migler
Abstract: We determine the three-dimensional structure of melt-mixed carbon nanotube networks in an amorphous polymer via confocal microscopy and image analysis. We find that the CNTs networks consist of ramified clusters whose size distribution scales with cl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914833

3. Resonant Microwave Absorption in Thermally Deposited Au Nanoparticle Films Near Percolation Coverage
Published: 6/19/2013
Authors: Jan Obrzut, Jack F Douglas, Oleg A Kirillov, Fred Sharifi, James Alexander Liddle
Abstract: We observe a resonant transition in microwave absorption in thin thermally deposited Au nanoparticle films near the geometrical percolation transition pc where the films exhibit a ,fractal‰ heterogeneous geometry. The absorption of incident microwa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912786

4. Rippling Instability of Supported Polymer Nanolines
Published: 2/21/2012
Authors: Vijaya R. Tirumala, Christopher M Stafford, Leonidas E. Ocola, Jack F Douglas, L. Mahadevan
Abstract: The swelling response of polymer line gratings supported on a rigid substrate has direct implications on their mechanical stability during pattern transfer in nanofabrication. The polymer lines, when swollen in a good solvent, undergo a rippling inst ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909469

5. Using Block Copolymer Self-Assembly to Imprint the Crystallization of Polymer Dendrites
Published: 8/10/2011
Authors: Sangcheol Kim, Alamgir Karim, Jack F Douglas, Christopher L Soles, R M Briber
Abstract: We utilize the self-assembly of cylinder-forming block copolymer (BCP) films to create templates for dendritic polymer crystallization patterns. This templating was achieved by simply spin-casting thin films from a solution containing both the BC ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903962

6. Flexure-induced structural and electronic changes in polymer supported membranes of length purified single-wall carbon nanotubes
Published: 2/22/2011
Authors: John M. Harris, Ganjigunte R.S. Iyer, Daneesh O. Simien, Jeffrey A Fagan, JiYeon Huh, Jun Y. Chung, Steven D Hudson, Jan Obrzut, Jack F Douglas, Christopher M Stafford, Erik K Hobbie
Abstract: 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 c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907546

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904774

8. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902099

9. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904974

10. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904589



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