In the present work some physical properties of binary zinc chloride-dimethylsulfone (ZnCl2DMSO2) melts were investigated; the phase diagram was determined by Differential Scanning Calorimeter (DSC) and Thermogravimetric Analyzer (TGA) analyses; the electric conductivity was measured using a direct-current computerized method. The conductivities of the melts increased with increasing temperatur...

A major mystery of glass-forming liquids is the non-Arrhenius temperature-dependence of the average relaxation time. This paper brie ̄y reviews the classical phenomenological models for non-Arrhenius behavior ± the free volume model and the entropy model ± and critiques against these models. We then discuss a recently proposed model according to which the activation energy of the average relaxat...

We have studied a system composed of an hydrophobic aerosil (R812) dispersed in the liquid crystal 4-n-octyl-4’-cyanobiphenyl (8CB) using the spin probe ESR technique and, in particular, we have determined, for different aerosil concentrations, the temperature dependence of the orientational order parameter 〈P2〉 and the rotational diffusion coefficient D⊥ of the probe 5-doxyl stearic acid in th...

The molecular mobility of films thermoplastic aromatic polyimides and nanocomposites based on them with 3% cerium dioxide has been studied by dielectric spectroscopy. Three relaxation regions dipole polarization were found for the initial polyimides, γ β (in glassy state) α (transition to a highly elastic state).The introduction into matrix polyimide leads suppression process appearance in spec...

Ethanol is commonly used as a solvent in extracting glucomannan from Porang. However, the extraction process often leaves ethanol. The remaining ethanol can be re-distilled to save use of it. re-distillation with input volumes 50L and 100L variations heating temperatures 80°C, 85°C, 90°C. This study aimed analyze effect volume temperature on output determine constant change using kinetics Arrhe...

The effects of temperature on the chloride-induced corrosion behavior reinforcing steel in simulated sea-sand concrete pore solution are studied by means linear polarization resistance. results show that Ecorr (corrosion potential) and icorr current density) steels and/or chloride concentration (CCl)-related parameters. A correlation between a natural logarithmic CCl observed. It is proved rela...

This research investigated how the variation of temperature and shear rate affects viscosity ethanol gel propellants that use methyl cellulose as gellant and, in parts, boron energetic additive. Using a rotational viscometer cone-and-plate configuration, propellant data was recorded across range temperatures applied rates. The temperaturedependence modelled using an Arrhenius-type equation. For...

This study aims to propose a kinetics-based model of fatigue crack growth rate coupling with temperature, strain level and damage degree for bituminous materials. The length is calculated by an energy-based mechanistic (EBM) approach, kinetic parameters characterizing the are determined based on Arrhenius equation. Results show that logarithm linear inverse absolute cracking activation energy i...

The widely used Arrhenius equation describes the kinetics of simple two-state reactions, with the implicit assumption of a single transition state with a well-defined activation energy barrier DeltaE, as the rate-limiting step. However, it has become increasingly clear that the saddle point of the free-energy surface in most reactions is populated by ensembles of conformations, leading to nonex...

The characteristic relaxation time τ of protein hydration water exhibits a strong hydration level h dependence. The dynamic crossover is observed when h is higher than the monolayer hydration level hc=0.2-0.25 and becomes more visible as h increases. When h is lower than hc, τ only exhibits Arrhenius behavior in the measured temperature range. The activation energy of the Arrhenius behavior is ...