排序方式: 共有20条查询结果,搜索用时 15 毫秒
1.
离子型共聚单体参与下的全氟丙烯酸酯无皂乳液共聚 总被引:4,自引:0,他引:4
离子型共聚单体参与下的全氟丙烯酸酯无皂乳液共聚;全氟烷基丙烯酸酯;无皂乳液;离子型共聚单体 相似文献
2.
Lasers and amplifiers in a single fiber have been developed rapidly, especially for optical fiber communication and various sensors, in the recent years. However, remarkable progress and achievement have been made mainly in silica fiber doped with rare earth elements. In this paper, we report the progress on the development of the Yb3+-doped phosphate fiber laser. 相似文献
3.
S.P. Feofilov D.V. Arsentyev A.B. Kulinkin R.I. Zakharchenya 《Journal of luminescence》2011,131(3):438-6358
The fluorescence spectra of nanocrystalline powder samples of Sc2O3:Ce3+ prepared by the sol-gel process were studied. The strong shift of the fluorescence spectra with the excitation wavelength was observed. The effect of the surrounding gaseous medium on 4f05d1→4f1 fluorescence of Ce3+ ions in nanoparticles, discovered earlier in YAG:Ce3+, was also observed and studied in Sc2O3:Ce3+. The fluorescence intensity and the excitation power dependence of fluorescence dramatically depend on the pressure of the gaseous media. 相似文献
4.
MATTHEW T. STONE PIETER J. IN 'T VELD YING LU ISAAC C. SANCHEZ 《Molecular physics》2013,111(17):2773-2792
In this study Monte Carlo simulations are used to determine the solvation properties of model hydrophobic (xenon and hard sphere) and hydrophilic (dimethyl ether) solutes in SPC/E water. Various contributions to the experimental solvation entropy, including the solvent reorganization entropy, have been determined. The main conclusion drawn, which is in accord with solubility data, is that poor solubility correlates with poor solute-water interaction. At room temperature, energy dominates the aqueous solubility of both hydrophobic and hydrophilic solutes, rather than entropy. However, at higher temperatures the solubility can pass through a minimum, and then entropy becomes dominant. Another interesting finding is the presence of larger than expected cavities in water. Two different simulation results support this finding. This unexpected hollow structure in water explains why a hard sphere solute is more soluble in water than in a comparable hard sphere or Lennard-Jones solvent. Hydrogen bonding causes water to aggregate into clusters that produce a few large cavities rather than many smaller cavities. The propensity for clustering also explains why water gives the illusion of being a low density liquid. Sufficient theoretical apparatus is developed to connect theoretical solvation properties to those measured by simulation and experiment. Finally, based on gas solubility, an intuitive hydrophobic/hydrophilic scale is developed. 相似文献
5.
M. IN HET PANHUIS C. H. PATTERSON R. M. LYNDEN-BELL 《Molecular physics》2013,111(6):963-972
Atomistic simulations are reported of a model of CO2 in water. CO2 is modelled by partial charges and Lennard-Jones interaction sites on each atom; the SPC/E model for water is used. Good agreement with experiment is found for the translational diffusion constants. The variation of the dynamics with the potential parameter was investigated. As expected, the orientational correlation times increase as the magnitude of the quadrupole moment is increased, but the translational diffusion constants are found to be surprisingly insensitive to the magnitude of the CO2 quadrupole moment. The translational friction coefficient was resolved into electrostatic, Lennard-Jones and cross-terms; the Lennard-Jones contribution is found to be the largest. Varying the Lennard-Jones size parameter affects both translational and reorientational motion. In order to try to understand these results further, the variation of solvation free energy was investigated and the solvent structure around carbon dioxide was examined as the electrostatic and Lennard-Jones parameters were changed. The temperature dependence of the self-diffusion constant of pure SPC/E water was determined. 相似文献
6.
Smolyanskii A. S. Arsentyev M. A. Rashkovskii A. Yu. Politova E. D. 《Crystallography Reports》2019,64(4):553-558
Crystallography Reports - An analysis of the diffraction patterns of powdered polytetrafluoroethylene (PTFE) γ-irradiated at room temperature in a nitrogen atmosphere to doses of 10–500... 相似文献
7.
G. F. Prozorova S. A. Korzhova T. V. Kon’kova T. G. Ermakova A. S. Pozdnyakov A. N. Sapozhnikov O. A. Proydakova B. G. Sukhov K. Yu. Arsentyev E. V. Likhoshvai B. A. Trofimov 《Journal of Structural Chemistry》2010,51(1):105-108
Novel multifunctional hybrid nanocomposites with silver and gold nanoparticles stabilized by original polymer matrix based on poly-1-vinyl-1,2,4-triazole were synthesized and studied using UV and IR spectroscopy, X-ray diffraction analysis and transmission electron microscopy. The obtained nanocomposites comprise silver or gold nanoparticles of spherical and elliptical shape with size 3–20 nm and 1–10 nm, respectively. 相似文献
8.
A formalism for studying the interference between the direct reaction and the compound resonance processes is presented by the S-matrix theory; The mechanism of 12C(d, d) 12C, 12C(d, p1) 13C* and 12C(d, p2) 13C* reactions in the energy range Ed=1.63 MeV to 2.05 MeV is analysed.Te results show that: the interference between these two processes exists; and the quantitative relation between them is given. While the parameters of direct reactions and compound resonance processes, particularly for four resonance states with Ed=1.726, 1.767, 1.792 and 1.86 MeV are determined. 相似文献
9.
P. V. Seredin D. A. Goloschapov A. S. Lenshin V. E. Ternovaya I. N. Arsentyev A. D. Bondarev I. S. Tarasov 《Bulletin of the Russian Academy of Sciences: Physics》2017,81(9):1119-1126
IR and UV spectroscopy is used to study the properties of nanostructured aluminum nitride films obtained via reactive ion-plasma sputtering on GaAs substrates with different orientations. Nanostructured thin (100–200 nm) films of cubic aluminum nitride with optical bandgaps of ~5 eV and refractive indices varying from 1.6 to 4.0 in the wavelength range of ~250 nm are fabricated. Growth on a misoriented GaAs(100) substrate (4° with respect to the [110] plane) makes it possible to synthesize AlN films with smaller grains and higher refractive indices (n ~ 4). It is shown that misoriented GaAs substrates allow us to control the morphology, surface composition, and optical functional characteristics of AlN/GaAs heterophase systems. 相似文献
10.