für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Liquid-liquid equilibrium data of toluene or benzene+n-hexane or n-heptane or n-octane hydrocarbon systems are reported with many solvent mixtures at 298.15K.Complete phase digrams were obtained by evaluating the solubility and tie line results for each ternary mixture. The thermodynamic models :NRTL,UNIQUAC,and UIFAC models were used to correlate the experimental data and to predict the phase compositions of the ternary systems.The NRTL equation fitted the experimental data better than the UNIQUAC and UNIFAC equations:the average root mean square deviations (RMSD) was 0.165 for NRTL as compared to 0.491 for UNIQUAC and 1.304 for UNIFAC. ····· 103611037
für 49.41€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Barium Strontium Titanate Ba(x)Sr(1-x)TiO3 Is a solid solution between BaTiO3 and SrTiO3 which posses different Ferroelectric Curie temperature , Barium Strontium Titanate (BST) posses an adjustable value of Ferroelectric Curie temperature Tc depending on the value of (x). BST has wide range of applications depending on Curie temperature and Dielectric properties . BST used in communications especially in microwave tunable circuits , phase shifter , waveguides , antennas , MOSFET ,MLCCs and Varactor. ····· 10361773
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray These data have been used to arrive at the various parameters like partial molar volumes and their corresponding transfer functions, side chain contributions, interaction coefficients, activation parameters and hydration numbers. These parameters have been used to rationalize the nature of interactions amongst various amino acids/diglycine (solutes) and water (solvent) in the presence of various electrolytes. From the comparison of partial molar volumes of studied amino acids in aqueous solutions of sodium nitrate[Soto et al. (1999)], NaCl[Bhat et al. (1985)], sodium sulphate[Wadi and Ramasami (1997)] and sodium acetate[Banipal et al. (2004)], it may be observed that apparent molar volumes may vary with the change in concentration of electrolytes. As the anionic part of the salts is mainly modulating the behavior of partial molar volumes because the cationic part is same in the above salts. However in case of L-valine and L-leucine with the increase in the size of nonpolar side chain, the hydrophobic effect also starts influencing the partial molar volumes.Thus there is a competition between interactions due to the anionic part of salts and hydrophobicity of the various amino acids. ····· 10361747
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Polymer and Surfactant Supported Ultrafiltration is a technique that is equally effective for removing both inorganic and organic pollutants from water. A bio-polymer namely Sericin is extracted from silk and it is water soluble. Moreover, It has ability to show chelation with metal ions in water. Likewise, surfactant forms micelles in water which encapsulate organic dyes. In this way, the size of pollutants increases due to either chelating effect of Sericin or micelles formed by the selected surfactant in water. Once the size of metal ions or organic dye has increased, they are subjected to pass through a porous barrier such as membrane in an ultrafiltration cell/plant. These pollutants with enhanced size get stuck on the surface of membrane whereas pollutant free water stream is collected on other side of membrane as a permeat soluion. Recycling of permeat solution finally gives pure water. ····· 10361630
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book presents the important facts about the reaction and mechanism in aqueous micellar media and colloidal systems. A detailed stereochemical discussion of the reaction steps in each mechanism and their relationship with kinetic observations has been considered. Kinetics is the study of rate processes such as chemical reactions, diffusion and the flow of charge in an electrochemical cell. Manganese shows variable oxidation state in their compounds and this ability is certainly related to the redox function of the metal ion in biological system. Permanganates are the broad range oxidants in synthetic as well as analytical chemistry and also act as disinfectant. The studies discussed in this book deals with the kinetics and mechanism of electron transfer reactions in colloidal systems of carbohydrates and amino acids in absence and presence of anionic, cationic and non-ionic surfactants by permanganate ions. It is believed that the present book will provide a succinct and clear introduction to kinetics and mechanism of electron transfer reaction that meets the needs of researchers at a variety of levels in several disciplines. ····· 10361464
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Nowadays considerable research has been carried out on a new type of surfactants called as gemini surfactants, using variety of experimental methods. By far the most studied of gemini surfactants are cationic gemini, m-s-m (N, N -bis(alkyldimethyl)- , -alkanediammonium dibromide type) type surfactant. In particular, the choice of cationic gemini surfactants was made in an effort because of the low toxicity of quaternary ammonium surfactants as well as low critical micelle concentration. In addition to low toxicity, quaternary ammonium surfactants exhibit broad spectrum of antimicrobial activity including antibacterial, antifungal and antiviral. Gemini surfactants may be an appropriate alternative to traditional quaternary ammonium compounds. The geminis used in the present studies, though extensively studied, still lack a quantitative interpretation of their mixed micellar behaviour with the conventional surfactants. Therefore, a thorough investigation and relative comparison among the mixed micellar properties with the conventional surfactants would allow their appropriate applications to achieve both fundamental as well as applied goals. ····· 10361459
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Aerogel holds 15 entries in the Guinness Book of Records, more than any other material. It is the lightest solid in existence according to the record book. Henceforth, may be the most unique material on the earth.Aerogels have extremely high surface area as well as porosity. These unique properties are being used for thermal and acoustic insulation. Therefore, sometimes called `frozen smoke`. This material is produced by the supercritical drying or ambient pressure drying of liquid gels. The most common type is silica aerogel. In this context sol-gel processing of water glass (sodium silicate) and alkooxide based silica aerogels is described. The silica gels are dried at ambient pressure to reduce final cost of the aerogel. Their physical properties are studied. ····· 10361124· 1 ·· 2 ·· 3 ·· 4 ·· 5 ·· 6 ·· 7 ·· 8 ·· 9 ·
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