Different characterization techniques were used to study the hydrolysis and condensation reaction kinetics of 3-methacryloxypropyltrimethoxysilane (MAPTMS) to obtain open cage silsesquioxane oligomers. The formation of hydrogen bonds, which condition the chemical structures of the resulting products, was identified. Improved thermal and fire resistant behavior of unsaturated polyester (UP) comp...

The present status of plasma processes involving heat and mass transfer is surveyed, with particular reference to the proceses of vaporization, condensation and chemical reaction. Some of the more important plasma techniques are discussed with emphasis placed on means for maximising the overall thermal efficiency of the mass transfer process, and for controlling the properties of the condensed ...

Methods of rapidly and accurately assessing the chemical stability of pharmaceutical dosage forms are reviewed with respect to the major degradation mechanisms generally observed in pharmaceutical development. Methods are discussed, with the appropriate caveats, for accelerated aging of liquid and solid dosage forms, including small and large molecule active pharmaceutical ingredients. In parti...

The thermal screening unit is an instrument specifically designed for the fast and efficient hazard screening of liquids, solids and heterogeneous systems. The unit provides an alternative device to DSC and DTA for use in hazard assessment and provides information regarding reaction “onset temperatures”, rates of temperature rise as well as crucial information regarding the rates and magnitudes...

in a temperature gradient, see Fig.1. This is of our knowledge the first molecular dynamics study of a reacting system submitted to non-equilibrium conditions. The reaction, which is diffusion controlled, was investigated at and close to local chemical equilibrium. The transport properties are determines; i.e. diffusion, thermal conductivity and the coupling between transport of heat and mass. ...

Carbene species are grafted onto Mo(100) by the thermal decomposition of methylene iodide, where the decomposition is followed using ultraviolet photoelectron spectroscopy. Carbenes hydrogenate to methane by reaction with surface hydrogen via a secondorder reaction with an activation energy of 21 ___ 2 kJ mol1. Experiments with deuterium show that there appears to be no hydrogendeuterium exchan...

The present paper deals with the study of flow, heat and mass transfer characteristics of the free convection on a vertical plate in porous media with variable wall temperature and concentration in a doubly stratified and viscous dissipating micropolar fluid in presence of chemical reaction, heat generation and Ohmic heating. A uniform magnetic field is applied normal to the plate. The governin...

A new method to generate chemical reaction network is proposed. The particularity of the method is that network generation and mechanism reduction are performed simultaneously using sampling techniques. Our method is tested for hydrocarbon thermal cracking. Results and theoretical arguments demonstrate that our method scales in polynomial time while other deterministic network generators scale ...

The process of synthesizing silica nanopowder by the gas phase thermal oxidation of tetraethylorthosilicate (TEOS) in a diffusion flame reactor was simulated using a commercial computational fluid dynamic (CFD) code. The fuel combustion process and silica particle formation and growth in the flame are modeled. The temperature, velocity and particle size distribution (PSD) fields inside the reac...

In this work, a Homotopy Perturbation Solution of magnetohydrodynamic (MHD) model of boundary-layer equations for an electrically conducting Nanofluid flow bounded by an infinite parallel vertical permeable plates is to be introduced. This model is applied to study the mass and heat transfer of an unsteady nanofluid, incompressible flow with suction, internal heat generation, Hall Effect and Ch...