Mat o14 synthesis o carboxymethylchitosan as

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Unformatted text preview: OCMC was elucidated by using Fourier Transform Infrared spectroscopy (FTIR). The synthesized OCMC was soluble in water at various pH as compared to the chitosan. The inhibition effect of OCMC on the corrosion of mild steel in 1 M HCl was studied by weight loss measurement, polarization and electrochemical impedance spectroscopy (EIS) methods. It was found that inhibition increase with increasing concentration of OCMC. The weight loss -4 measurement shows the highest efficiency which is 87.09 % at 7 x 10 M. Polarization studies shows that OCMC behaves as mixed-type inhibitor. 149 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia MAT-O15 SYNTHESIS AND CHARACTERIZATION OF PHOSPHINE FUNCTIONALIZED MULTI-WALLED CARBON NANOTUBES AA Muleja, XY Mbianda, RW Krause and K Pillay Department of Chemical Technology, Faculty of Science, University of Johannesburg, Doornfontein Campus, Johannesburg 2028, South Africa E-mail: mbianday@uj.ac.za Carbon nanotubes (CNTs) are a well organized form of carbon arranged in tubular shapes. CNTs are mostly used in the fabrication of nanomaterials. Nowadays, several areas of science, engineering, technology, development and industry are being influenced by the uses of nanomaterials. Multi-walled carbon nanotubes (MWCNTs) were produced by a technique known as nebulizer spray pyrolysis (NSP). The mixture of toluene and ferrocene was used in the synthesis of MWCNTs. Arylated-MWCNTs were formed from a coupling of 4-bromobenzenediazonium tetrafluoroborate and purified MWCNTs. This was performed in the presence of 1 -methyl-3-octylimidazolium tetrafluorobate and potassium carbonate through a nucleophilic aromatic substitution mechanism. Phosphorylation of arylated MWCNTs was then achieved at room temperature by substitution of bromine anion with diphenylphosphide ion; by single electron transfer (SET) leading to triphenylphosphine -MWCNTs (TppMWCNTs). The morphology of nanotubes was analyzed by electron microscopy techniques such TEM and SEM. FTIR spectrum revealed peaks of phenyl groups attached directly to phosphorus near 1000 -1 and 1440 cm . Th...
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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.

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