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Author: jack douglas

Displaying records 201 to 210 of 224 records.
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201. Crystallization of Poly(ethylene oxide) on Topographically Patterned Substrates
Published: Date unknown
Authors: Brian C. Okerberg, Christopher L Soles, Jack F Douglas, Alamgir Karim
Abstract: Crystallization of poly(ethylene oxide) (PEO) on topographically patterned substrates is investigated. Primary nucleation was dramatically enhanced during solvent drying on patterned substrates compared to flat films. The nucleation density also in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852757

202. Dendritic Crystallization in Thin Films of PEO/PMMA Blends: A Comparison to Crystallization of Small Molecule Liquids
Published: Date unknown
Authors: Brian C. Okerberg, H Marand, Jack F Douglas
Abstract: Dendritic crystallization of PEO/PMMA thin films is reported. The film thickness is kept constant while the PMMA molar mass and blend composition are varied. Some basic features of dendritic growth, such as the diffusion length and tip curvature ar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852771

203. Dispersion and Shear Viscosity of a Simulated Polymer Nanocomposite
Published: Date unknown
Authors: Francis W. ~undefined~undefined~undefined~undefined~undefined Starr, Jack F Douglas, S C Glotzer
Abstract: Using molecular dynamics simulations, we explore properties affecting nano-filler dispersion in a dense bead-spring polymer melt, and how the state of dispersion alters the response of the system to shear. We determine a simple metric to determine t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852087

204. Effects of Aspect Ratio of Multi-Walled Carbon Nanotube on Flammability Properties of Polymer Nanocomposites
Published: Date unknown
Authors: Bani Cipiriano, Takashi Kashiwagi, Srinivasa R. Raghavan, Ying Yang, E A Grulke, Kazuya Yamammoto, John R Shields, Jack F Douglas
Abstract: The effects of the aspect ratio of multi-walled carbon nanotube (MWNT) on viscoelastic properties and flammability properties of PS/MWNT nanocomposites are studied with two different MWNTs having average aspect ratios of 49 and 150. While no signifi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861452

205. Entanglement Effects on the Dewetting of Polymer Thin Films
Published: Date unknown
Authors: K A Barnes, Alamgir Karim, Jack F Douglas, Da-Wei Liu, Eric J. Amis
Abstract: We investigate the dewetting of entangled and unentangled polymer films from model viscous polymer and inorganic substrates. Linear and hypergraft polyethyloxazoline (PEOX) polymers are chosen as the unentangled and entangled dewetting fluid, respec ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851527

206. Flammability Properties of PMMA-Single Walled Carbon Nanotube Nanocomposites
Published: Date unknown
Authors: Takashi Kashiwagi, F Du, K Winey, K M. Groth, John R Shields, Richard H. Harris Jr., Jack F Douglas
Abstract: Flammability properties of PMMA/SWNT nanocomposites were measured. The addition of SWNT significantly reduces mass loss rate of PMMA even for the contents less than a 1 % mass fraction. The dispersion of tubes affects flammability properties.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861286

207. Flammability Properties of Poly(methyl methacrylate)-Single Walled Carbon Nanotube Nanocomposites
Published: Date unknown
Authors: Takashi Kashiwagi, K Winey, Richard H. Harris Jr., John R Shields, Jack F Douglas
Abstract: Recent measurements on polymer nanocomposites filled with multiple-walled carbon nanotubes (MWNT) have indicated that these nanoparticles are highly effective fire retardants at low loading (1 wt.-%). We report here similar results for single-walled ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861238

208. Fluctuation Effects on Surface Pattern Formation in Thin Block Copolymer Films
Published: Date unknown
Authors: A C Smith, Jack F Douglas, Eric J. Amis, Alamgir Karim
Abstract: Hole formation on the surface of thin block copolymer films is investigated as a function of time (t), temperature (T) and film thickness. The size of the holes, h^ds^, approaches a steady state value at long times h^ds,{infinity}^ = h^ds^(t -> {inf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851931

209. Isothermal Stress and Elasticity Tensors for Ions and Point Dipoles Using Ewald Summations
Published: Date unknown
Authors: K Van Workum, K Yoshimoto, J J de Pablo, Jack F Douglas
Abstract: The isothermal stress tensor and isothermal elasticity tensor for systems of point charges and of non-polarizable point dipoles are derived from the strain derivatives of the free energy. For the case of point dipoles, it is shown that the angular de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852469

210. Laser Based Angle-Resolved Photoemission, the Sudden Approximation and Quasiparticle-Like Spectral Peaks in Bi^d2^Sr^d2^Cu^d2^O^d8^+Delta
Published: Date unknown
Authors: j D Koralek, Jack F Douglas, N C Plumb, Z Sun, A V Fedorov, M M Murnane, H C Kapteyn, Steven T Cundiff, Y Aiura, K Oka, H. Eisaki, D S Dessau
Abstract: A new low photon energy regime of angle-resolved photoemission spectroscopy is accessed with lasers and used to study the hight T^dc superconductor Bi^d2^CaCu^d2^O^d8^d+^delta. The low energy increases bulk sensitivity, reduces background, and improv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842363



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