Papers by Keyword: Relaxation Process

Abstract: The features of organomodifiedmontmorillonite with different concentrations of guanidine acrylate.The influence of modifiers on the relaxation properties of nanocomposites on the basis of PA6 and organoclays by dynamic mechanical analysis.

Abstract: In this work we report the study of magnetic relaxation process presented in the bimetallic Co/Au nanoparticles prepared utilizing the reverse micelle method. Structural analysis of the system using synchrotron X-ray diffraction and transmission electron microscopy documented individual nanocrystalline particles of average size about 7 nm. Magnetic properties of the particles were examined by ac magnetic susceptibility measurements at temperature range 2 – 300 K at different frequencies of magnetic field. The relaxation process was revealed at temperature about 6 K. Application of several theoretical models on experimental data of magnetic susceptibility confirmed strong inter-particle interactions and novel superspin glass state in the nanoparticle system at low temperatures.

Abstract: The molecular dynamics simulations on the isothermal relaxation properties of supercooled liquid and glassy Pb have been performed. The calculated diffusion constant of Pb is well agreed with the experimental result. Results indicate that the relaxations of supercooled and glassy Pb present more and more pronounced heterogeneity with decreasing temperature. The appearance of the second plateau of mean square displacement (MSD) and the non-zero plateau of Non-Gaussian parameter (NGP) is corresponding to the rest of structure rearrangement.

Abstract: Due to the impact of the CO2 kinetic cooling effect, which is kind of energy transfer between CO2 and N2 molecules, the mixed gas containing CO2, the amplitude of the photoacoustic signal and the detected gas concentration are no longer a linear change, and the signal phase also has been changed. In this study, the energy transfer model between CO2 and N2 molecules in near-infrared band (1～2.2μ) was derived, the influence from CO2 gas with different concentration on photoacoustic signal was discussed, and the relevant experimental tests were made，which showed that the proposed model can scientifically interpret the energy transfer relation between CO2 and N2 molecules and can quantitatively determine the influence from CO2 gas with different concentration on photoacoustic signals excited by mixed gas with including CO2 gas.