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Articles by A.H. Nour
Total Records ( 3 ) for A.H. Nour
  Maryudi , R.M. Yunus , A.H. Nour and M.H. Abidin
  The explorations of prodegradant additives for plastics from trans-metals organic salts have been being conducted. This study reports a method of synthesis of manganese carboxylates and their characterization. The new method involves reaction between molten carboxylic acid with sodium hydroxide in alcoholic solution to produce sodium carboxylate and continued by reacting sodium carboxylate with chloride salt of manganese. First reaction and second reaction were conducted at 80-85°C and under perfect agitation. Second reaction took place well in the low concentration of manganese chloride, about 0.25 M or less. Manganese carboxylates (manganese laurate, manganese palmitate, manganese stearate) densities are 0.376, 0.227 and 0.201 g cm-3, respectively. Their onset melting points are 104.95, 111.27 and 114.69°C, respectively, obtained by Differential Scanning Calorimeter (DSC) test. Thermogravimetric Analyzer (TGA) test have been done on manganese carboxylates to investigate their thermal stabilities. The results obtained in this study have exposed the capacity of manganese carboxylates stability at processing temperature of polyethylene. It was also found that manganese carboxylates were insoluble in water, ethanol, acetone, n-hexane, cyclohexane, benzene and toluene.
  A.H. Nour , S.A. Elhussein , N.A. Osman , N.E. Ahmed , A.A. , Abduelrahman , M.M. Yusoff and A.H. Nour
  This study is concerned with the evaluation of antibacterial activity of the essential oils of the most commonly grown ornamental-type basils (five types) as well as that of wild-type basil which spontaneously grows in large pure stands during the rainy season. The essential oils of all six basil types showed strong antibacterial activity against E. coli, Staphylococcus aureus and Salmonella typhimurium. This activity was dose-dependent. Calculated LD50 values varied between 40 and 325 μL of crude essential oil/well, for the three bacteria, using the agar well diffusion method. The crude essential oil of wild Sudanese basil, assayed by the disc diffusion method, had three TLC-separated compounds which were active against Salmonella typhimurium. One of these was identified as geraniol, a major constituent of the essential oil. Thus basil essential oil has potential clinical or food applications as an antibacterial agent.
  A.H. Nour , S.F. Pang , A.H. Nour and M.S. Omer
  This study was conducted to examine a batch microwave process of 2450 MHz in demulsification of water-oil- (w/o) emulsions as well as the effect of triton X-100 and Low Sulfur Wax Residue (LSWR) from synthesized (w/o) emulsions stability and demulsification. Oil exploitation is always accompanied by the non-desired formation of emulsions caused by the presence of naturally occurring surface-active molecules such as asphaltenes and resins. Because their presence stabilizes the oil/water interface, it is necessary to break emulsions by adding other surface-active molecules. In this study, a microwave demulsification method was utilized in a 50-50% and 20-80% of water-in-oil emulsions with varied microwave exposure time. Results show that, temperature profiles of water-in-oil emulsions inside a cylindrical container were measured. The temperature rise at a given location was linear. The rate of temperature increase of emulsions decreased at higher temperature due to decreasing dielectric loss of water. Due to its fast, volumetric and selective heating, microwave heating can be used an alternative demulsification method for water-in-oil emulsions.
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