Jack F. Douglas
National Institute of Standards and Technology
ParticlePhysicsStatistical physicsGlass transitionNanoparticleChemical physicsComposite materialNanotechnologyChemistryPolymer chemistryThin filmMaterials scienceSelf-assemblyCondensed matter physicsPolystyreneChemical engineeringCarbon nanotubePolymerMolecular dynamicsThermodynamics
739Publications
91H-index
23.3kCitations
Publications 650
Newest
#1Ferenc Horkay (NIH: National Institutes of Health)H-Index: 38
#2Alexandros Chremos (NIH: National Institutes of Health)H-Index: 3
Last. Yan Xia (Stanford University)H-Index: 23
view all 0 authors...
We systematically investigate model synthetic and natural bottlebrush polyelectrolyte solutions through an array of experimental techniques (osmometry and neutron and dynamic light scattering) along with molecular dynamics simulations to characterize and contrast their structures over a wide range of spatial and time scales. In particular, we perform measurements on solutions of aggrecan and the synthetic bottlebrush polymer, poly(sodium acrylate), and simulations of solutions of highly coarse-g...
Source
#1Wenjie Wu (UH: University of Houston)H-Index: 2
#2Maninderjeet Singh (UH: University of Houston)H-Index: 4
Last. Markus Bleuel (NIST: National Institute of Standards and Technology)H-Index: 15
view all 16 authors...
While the phase separation of binary mixtures of chemically different polymer-grafted nanoparticles (PGNPs) is observed to superficially resemble conventional polymer blends, the presence of a "soft" polymer-grafted layer on the inorganic core of these nanoparticles qualitatively alters the phase separation kinetics of these "nanoblends" from the typical pattern of behavior seen in polymer blends and other simple fluids. We investigate this system using a direct immersion annealing method (DIA) ...
Source
#1Xiaolei Xu (CAS: Chinese Academy of Sciences)H-Index: 4
#1Xiaolei Xu (CAS: Chinese Academy of Sciences)H-Index: 7
Last. Wen-Sheng Xu (CAS: Chinese Academy of Sciences)H-Index: 13
view all 3 authors...
Source
#1Wengang Zhang (NIST: National Institute of Standards and Technology)H-Index: 7
#2Jack F. Douglas (NIST: National Institute of Standards and Technology)H-Index: 91
Last. Francis W. Starr (Wesleyan University)H-Index: 54
view all 4 authors...
Source
#1Sachin R. Natesh (U of C: University of Chicago)H-Index: 1
#2A. R. Hummels (U of C: University of Chicago)
Last. Esmael J. Haddadian (U of C: University of Chicago)H-Index: 11
view all 8 authors...
We compared all-atom explicit solvent molecular dynamics simulations of three types of Aβ(1–40) fibrils: brain-seeded fibrils (2M4J, with a threefold axial symmetry) and the other two, all-synthetic fibril polymorphs (2LMN and 2LMP, made under different fibrillization conditions). Fibril models were constructed using either a finite or an infinite number of layers made using periodic images. These studies yielded four conclusions. First, finite fibrils tend to unravel in a manner reminiscent of ...
Source
#1Maninderjeet Singh (UH: University of Houston)H-Index: 4
#2Wenjie Wu (UH: University of Houston)H-Index: 2
Last. Alamgir Karim (UH: University of Houston)H-Index: 62
view all 6 authors...
1 CitationsSource
#1Ali Masud (UH: University of Houston)H-Index: 2
#2Melanie Longanecker (University of Akron)H-Index: 1
Last. Alamgir Karim (UH: University of Houston)H-Index: 62
view all 11 authors...
Previous studies have shown that the degree of ordering and alignment in block copolymer (BCP) films can be enhanced by increasing the thermodynamic driving force for microphase separation, χN, whe...
2 CitationsSource
#1Hao Zhang (U of A: University of Alberta)H-Index: 26
#2Xinyi Wang (U of A: University of Alberta)H-Index: 4
Last. Jack F. Douglas (NIST: National Institute of Standards and Technology)H-Index: 91
view all 4 authors...
We investigate the Johari-Goldstein (JG) [Formula: see text]-relaxation process in a model metallic glass-forming (GF) material ([Formula: see text]), previously studied extensively by both frequency-dependent mechanical measurements and simulation studies devoted to equilibrium properties, by molecular dynamics simulations based on validated and optimized interatomic potentials with the primary aim of better understanding the nature of this universal relaxation process from a dynamic heterogene...
Source
#1Ari Y. Liu (Wesleyan University)
#2Hamed Emamy (Columbia University)H-Index: 6
Last. Francis W. Starr (Wesleyan University)H-Index: 54
view all 4 authors...
We use molecular dynamics simulations to study how the chain length affects the structure and segmental dynamics of polymer–nanoparticle (NP) composites at semidilute NP concentrations. For NPs hav...
1 CitationsSource