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8 citations found for Melnichenko, Y.
Search for Melnichenko, Y. in the World Directory of Crystallographers
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research papers
A new methodology has been developed to determine the fraction of open and closed porosity in rocks, without reaching the zero average contrast condition, using (ultra-)small-angle neutron scattering.
research papers
Supercritical carbon dioxide within a porous silica aerogel behaves as a two-phase system formed by a film next to the silica walls and a remaining fluid phase. Small-angle neutron scattering allows one to determine the structural parameters of the involved phases.
addenda and errata
Errors in the paper by Ciccariello, Melnichenko & He [J. Appl. Cryst. (2011), 44, 43-51
] are corrected.
research papers
The Bio-SANS small-angle neutron scattering instrument at the High Flux Isotope Reactor of Oak Ridge National Laboratory and its performance are presented, along with unique sample environments.
short communications
The EQ-SANS instrument has completed its construction and commission and is ready to serve users. Initial experiments show that the instrument has met its design goals.
research papers
Small-angle neutron scattering has been used to study the effect of temperature and pressure on the phase behaviour of semidilute solutions of polymers dissolved in organic and supercritical solvents. Above the theta temperature (TΘ), these systems exhibit a "good solvent" domain, where the molecules expand beyond the unperturbed dimensions in both organic solvents and in CO2. However, this transition can be made to occur at a critical "theta pressure" (PΘ) in CO2 and this represents a new concept in the physics of polymer-solvent systems. For T < TΘ, and P < PΘ, the system enters the "poor solvent" domain, where diverging concentration fluctuations prevent the chains from collapsing and allow them to maintain their unperturbed dimensions.
abstracts
research papers
In order to take advantage of the new capabilities of the High Flux Isotope Reactor at Oak Ridge National Laboratory, a 40 m-long small-angle neutron scattering instrument has been constructed. The design and characteristics of this instrument are described, along with examples of scattering data to illustrate the performance.
