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Unformatted text preview: diction of the stability of vesicles from glycolipids based which resemble the l amellar phases. This enables experimental evaluation of the simulation results. About 250 glycolipid molecules were arranged in double bilayer in the absence as well as the presence of up to nearly 5000 water molecules. Since the system is large in term of dimension and number of atoms, all the calculations and analysis were carried out in high performance parallel computers using AMBER suite of programs. The results from this simulation give amongst others, auto correlation function of the surface area per lipid for a total of 100 nano seconds’ production, which shows that bilayers are stable throughout the simulation period. Further analysis of the area per lipid reveals a slight increase as more water is added, thus indicating a moderate swelling of the lamellar phase. Local density profile analysis confirms the swelling. The hydrogen bonding analysis shows a constant interaction between lipid molecules. This reflects the stability of the lamellar phase within the investigated water concentration range. 214 3rd ICYC 2010 Universiti Sains Malaysia PHY-O9 23rd-25th June 2010 ACETYLATION OF GLYCEROL TO SYNTHESISE BIOADDITIVES: CATALYSIS OVER BIMETALLIC AgCu/RICE HUSK SILICA-ALUMINA *Farook Adam and Radhika Thankappan School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected] The increased usage of biofuels for transportation leads to an overproduction of glycerol, which is the main byproduct (10 %) during biodiesel production. To utilize this renewable feedstock, the use of glycerol-based additives to improve petrol fuel properties is one of the possibilities currently being explored. Among many transformations (hydrogenolysis, oxidation), acetylation of glycerol with acetic acid to yield mono, di and tri acetyl esters of glycerol have great industrial applications (Schem e 1). Acetylation of glycerol with acetic acid was carried out over bimetallic Ag -Cu/rice husk silica-alumina catalysts in liquid-phase. Effect of reaction parameters such as temperature, molar ratio (glycerol:acetic acid) and catalyst weight have also been studied. Mono, di and tr...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11