Durable antistatic coating for polymethylmethacrylate

A durable antistatic coating is achieved on polymethylmethacrylate plastic without affecting its optical clarity by applying to the surface of the plastic a low molecular weight solvent having a high electron affinity and a high dipole moment, such as acentonitrile or nitromethane alone or in the presence of photopolymerizable monomer. The treated polymethylmethacrylate plastic dissipates most of the induced electrostatic charge and retains its optical clarity. The antistatic behavior persists after washing, rubbing and vacuum treatment

Diagramme de phases du système ternaire KCl-FeCl3-H2O. Isothermes 15 et 30 °C

The phase diagram of the ternary system KCl-FeCl3-H2O was determined at 15 and 30°C by conductimetric and analytical methods. The solubilitie curves are given. In this temperature range, we have observed the crystallisation fields of KCl , FeCl3.6H2O and of a double salt 2KCl.FeCl3.H2O.The composition of the isothermal invariant points (liq. ↔ KCl + FeCl3.6H2O) and (liq. ↔ FeCl3.6H2O + 2KCl.FeCl3.H2O) is determined

Diagramme d'équilibre liquide vapeur du système binaire NH3-CH3NH2

A static equilibrium apparatus is described which permits vapour - liquid equilibrium measurements in the range of 293 to 473K and pressure up to 100 bar. Both phases are analysed in a gas chromatography. Measurements are reported on ammonia - monomethylamine. The temperature - composition phase diagram of the binary system between 6 to 18bar is given

Équilibre solide-liquide du système quaternaire K

Le diagramme d'équilibre liquide-solide du système K+, Na+, Fe3+/Cl- - H2O a été établi à 15 et 30°C à l'aide de la méthode conductimétrique. Les méthodes des ensembles et des restes ont été utilisées de façon complémentaire. Les courbes à teneurs en eau constante sont données, les lignes monovariantes sont représentées en projection orthogonale, de même que les points invariants quaternaires. Pour les deux isothermes, on observe les domaines de cristallisation de KCl, NaCl, FeCl3.6H2O et 2KCl.FeCl3.H2O

Optimization of the Influencing Variables on the Corrosion Property of Steel Alloy 4130 in 3.5 wt.% NaCl Solution

In this work, the aqueous Lawsonia inermis extract (LI) is investigated as an economic and green deterioration inhibitive formula for steel alloy 4130 in 3.5 wt.% NaCl solutions. The water-based extraction process is considered as one of the cheapest techniques for preparation of active ingredients of natural products. These ingredients play an important role in corrosion mitigation of steel alloy 4130 in saline media. This extract was subjected to three different parameters: inhibitor concentration, rotation speed, and temperature in 3.5 wt.% NaCl solutions. The electrochemical techniques are used to perceive the corrosion behavior, and the obtained results were dedicated to theoretical explorations to assess the features of corrosion inhibition and the adsorption over the steel substrate in 3.5 wt.% NaCl solutions. Affording to the electrochemical techniques of LI showed very promising results against corrosion depending on the inhibitor concentrations. The inhibition efficiency of LI was additionally appraised at three diverse temperatures, and the results disclosed that the inhibition efficiency is decreased. Additionally, the theoretical aspects illuminated that the main active ingredients of LI have a proclivity to coagulate on the steel substrates allowing these areas to paradigm a protecting layer on the steel surfaces. This behavior is in provision of investigational results. Statistical studies were used to examine the consequence of chief constraints (i.e., inhibitor concentration, temperature, and rotation speed) on the inhibition efficiency and the rate of corrosion of steel alloy 4130. The inhibitive effect of LI in contradiction of the corrosion of steel alloy 4130 surfaces is considered by resources of DFT/6-31G(d) calculations. The quantum chemical parameters interrelated to the inhibition efficiency are considered

Thermal treatment of moroccan phosphogypsum

Phosphogypsum (PG) is produced as a by-product during treatment of phosphate rock with sulphuric acid to produce phosphoric acid according to the following simplified reaction: Ca_{10} (PO_2 )_6 F_2 + 10H_2 SO_4 {\rm{ }} + {\rm{ }}20H_2 O{\rm{ }}\buildrel {70{\rm{ }}\`a {\rm{ }}80^\circ C} \over \longrightarrow {\rm{ }}6H_3 PO_4 {\rm{ }} + {\rm{ }}2HF{\rm{ }} + {\rm{ }}10(CaSO_4 .2H_2 O) Minerai Phosphogypse PG is mainly CaSO4·2H2O but also contains impurities such as free phosphoric acid, phosphates, fluorides and organic matter that adhere to the surface of the gypsum crystals. Phosphogypsum is discharged directly to the Sea or into the natural evaporation ponds. Previous studies have focused on reducing impurity levels in PG. Phosphogypsum impurities can be removed by simple techniques. Washing with water removes the soluble impurities. By cons, other contaminants (radioactive elements, heavy metals ...) a specific treatment method required a complex technique where the treatment is likely to be expensive. In this study, we studied purification of phosphogypsum using water and the thermal behavior of the natural gypsum and Moroccan phosphogypsum to calculation of parameters for drying and dehydration reactions. Also, the effects of different heating temperature on the course of dehydration are investigated