Dielectric relaxation of supercritical water: Computer simulations
نویسندگان
چکیده
منابع مشابه
Dielectric Relaxation of Biological Water†
Dielectric relaxation and NMR spectrum of water in biological systems such as proteins, DNA, and reverse micelles can often be described by two widely different time constants, one of which is in the picosecond while the other is in the nanosecond regime. Although it is widely believed that the bimodal relaxation arises from water at the hydration shell, a quantitative understanding of this imp...
متن کاملMolecular dynamics simulations of dielectric relaxation of concentrated polymer solutions
Molecular dynamics simulations are conducted for concentrated solutions of flexible polymers. The results are contrasted with literature dielectric spectroscopy data, in an attempt to elucidate the observed phenomena from a molecular level perspective. A bead-spring model is used and systems with chain sizes up to N5150 beads at reduced densities 0.5<r<0.8 are studied. The dimensions of the cha...
متن کاملDielectric relaxation in dimethyl sulfoxide/water mixtures studied by microwave dielectric relaxation spectroscopy.
Dielectric spectra of dimethyl sulfoxide (DMSO)/water mixtures, over the entire concentration range, have been measured using the transmission line method at frequencies from 45 MHz to 26 GHz and at temperatures of 298-318 K. The relaxation times of the mixtures show a maximum at an intermediate molar fraction of DMSO. The specific structure of mixtures in different concentration regions was de...
متن کاملAnalysis of Dielectric Relaxation in Water at Microwave Frequency
A distribution function has been incorporated into polarization and the information about the distribution function has been obtained from the experimental results of water and from the existing theoretical models for dielectric dispersion. The theoretical values of the relaxation terms obtained from Davidson-Cole equation are very close to the relaxation terms evaluated from the experimental d...
متن کاملDielectric secondary relaxation of water in aqueous binary glass-formers.
Glassy aqueous binary mixtures generally exhibit a water induced dielectric relaxation. The characteristic time-scale of this relaxation follows an Arrhenius temperature dependence with a nearly universal activation energy. We here demonstrate for a series of model aqueous mixtures that the relaxation time also follows a remarkably general exponential dependence on the weight fraction of water....
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of Chemical Physics
سال: 2000
ISSN: 0021-9606,1089-7690
DOI: 10.1063/1.1289919