Zobrazeno 1 - 10
of 181
pro vyhledávání: '"George D. Wignall"'
Publikováno v:
Macromolecules. 50:4406-4414
Aiming to understand the inversion of crystallization kinetics observed by DSC, detailed SANS investigations of the melt structure of a broadly distributed ethylene–1-hexene copolymer have been undertaken in a wide range of temperatures that were r
Autor:
Shuo Qian, Sai Venkatesh Pingali, Hugh O'Neill, Kevin L. Weiss, Volker S. Urban, Douglas L Selby, William T. Heller, Yuri B. Melnichenko, Gary W. Lynn, George D. Wignall, Dean A. A. Myles, Kenneth C. Littrell, Paul Butler, Michelle V. Buchanan
Publikováno v:
Journal of Applied Crystallography. 47:1238-1246
Small-angle neutron scattering (SANS) is a powerful tool for characterizing complex disordered materials, including biological materials. The Bio-SANS instrument of the High Flux Isotope Reactor of Oak Ridge National Laboratory (ORNL) is a high-flux
Autor:
Yuri B. Melnichenko, Kathy Bailey, Paul Butler, Michelle V. Buchanan, Dean A. A. Myles, Douglas L Selby, William T. Heller, Gary W. Lynn, George D. Wignall, Volker S. Urban, Kenneth C. Littrell
Publikováno v:
Journal of Applied Crystallography. 45:990-998
A series of upgrades have been undertaken at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, including the installation of a supercritical hydrogen moderator (T≃ 20 K), which has boosted the flux of long-wavelength neutrons b
Autor:
Yuri B. Melnichenko, George D. Wignall
Publikováno v:
International Journal of Thermophysics. 30:1578-1590
The density and volume fraction of an adsorbed phase of carbon dioxide (CO2) in aerogels was investigated using a formalism based on independent measurements of neutron transmission and small-angle neutron scattering from fluid-saturated absorbers (R
Publikováno v:
Macromolecules. 41:9831-9836
The conformation and clusterization of comblike polymers of polystyrene densely grafted with oligo(ethylene glycol) (OEG) side chains in 1.0 wt % solutions of D2O, toluene-d8, and methanol-d4 was investigated as a function of the degree of polymeriza
Autor:
George D. Wignall, Fengjun Hua, Boualem Hammouda, Kunlun Hong, Jimmy W. Mays, Yuri B. Melnichenko, Gang Cheng
Publikováno v:
European Polymer Journal. 44:2859-2864
The conformation of newly synthesized amphiphilic poly(methoxyoligo(ethylene oxide) norbornenyl esters) macro-homopolymers in dilute solutions of toluene-d8 and D2O was investigated by small angle neutron scattering (SANS). The macro-homopolymers con
Autor:
Yuri B. Melnichenko, Kunlun Hong, Jimmy W. Mays, Fengjun Hua, Boualem Hammouda, Gang Cheng, George D. Wignall
Publikováno v:
Macromolecules. 41:4824-4827
The structures and association properties of thermosensitive block copolymers of poly(methoxyoligo(ethylene glycol) norbornenyl esters) in D2O were investigated by small angle neutron scattering (SANS). Each block is a comblike polymer with a polynor
Publikováno v:
The Journal of Physical Chemistry C. 111:15736-15742
Fluid accommodation in porous media has been studied over a wide range of pressures at three supercritical temperatures by small-angle neutron scattering. A new formalism gives for the first time the mean density and volume of the adsorbed fluid phas
Publikováno v:
Polymer. 48:4108-4113
Temperature induced conformational changes of poly(p-oligo(ethylene glycol) styrene) (POEGS) in aqueous solutions were investigated by small angle neutron scattering (SANS), neutron transmission and dynamic light scattering (DLS). The molecular weigh
Autor:
Yuri B. Melnichenko, George D. Wignall
Publikováno v:
Reports on Progress in Physics. 68:1761-1810
Before the application of small-angle neutron scattering (SANS) to the study of polymer structure, chain conformation studies were limited to light and small-angle x-ray scattering techniques, usually conducted in dilute solution owing to the difficu