The glycerol desorption from the ion exchange and adsorbent resin Purolite PD206 was studied using conventional and supercritical fluids techniques. Untreated biodiesel was purified by dry washing using the resin and, after purification, the glycerol desorption was carry out using three diferent solvents: absolute ethanol under atmospheric conditions at different mass flows (10 and 30 g/min), o...

We compute the thermal conductivity and diffusion coefficient of supercritical carbon dioxide along the 313 K isotherm using non-equilibrium molecular dynamics. Comparisons are made with experiment at four densities corresponding to pressures of 30, 70, 200 and 500 bar. Two intermolecular potential models for carbon dioxide are compared. INTRODUCTION In a previous paper (Wang and Cummings, 1988...

purpose : to evaluate the retinal nerve fiber layer (rnfl) and central corneal thickness (cct) in patients with exfoliation syndrome (xfs) methods : in this comparative case series we measures rnfl thickness and cct 30 patients with xfs and 30 age and sex matched healthy subjects who met the inclusion criteria. results : average rnfl in xfs group were significantly thinner than controls (94.36±...

Complete mineralization of hazardous organic compounds to innocuous products can be achieved using supercritical water oxidation (SCWO). At typical SCWO process conditions (500 – 650 °C), free radical chemistry has been shown to be the dominant reaction path. Detailed Chemical Kinetic Mechanisms (DCKM), consisting of elementary free-radical reactions, have been used to model the oxidation of a ...

Numerical studies have been carried out to investigate flow instabilities in a natural circulation loop with supercritical CO2. For steady-state and dynamic analyses of the loop under supercritical conditions, a single-channel, one-dimensional model is developed. In this model, equations for the conservation of mass, momentum and energy are discretized using an implicit finite difference scheme...

The electrochemical oxidation and reduction of decamethylferrocene is demonstrated in supercritical carbon dioxide at a macro gold disc electrode at 100 bar and 313 K. Fast mass transport effects were exhibited and the corresponding steady-state voltammetry was observed at high scan rates. A highly lipophilic room temperature ionic liquid that readily dissolved in supercritical CO(2) with aceto...

Lead-free piezoelectric (Bi1/2Na1/2)TiO3 (BNT) films were deposited on 1 mm thick pure titanium(Ti) substrates by a hydrothermal method. Tensile tests were performed to quantitatively assess the adhesion strength between BNT films and Ti substrates. Ti substrates were pretreated by chemical polish and mechanical polish respectively prior to BNT film deposition. In the tensile test, the behavior...

THE NORMAL EXFOLIATION PROCESS Exfoliation occurs naturally as outworn stratum corneum cells detach and are removed from the skin’s surface. Replacement of stratum corneum cells occurs by a self-renewal process as epidermal cells move upward from the basal layer, the stratum basalis, and through the subsequent two layers, the stratum spinosum and stratum granulosum, to reach the stratum corneum...