152 3rd icyc 2010 universiti sains malaysia mat o21

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Unformatted text preview: E-mail: [email protected] 1 Room temperature ionic liquids (RTILs) based on trioctyltetradecylphosphonium [P 8,8,8,14] with chloride 1 [Cl] and dioctylsulfosuccinate [docusate] anions were prepared and characterized using H NMR and elemental analysis. The experimental values of density and dynamic viscosity at a temperature range (293.15 to 353.15) K and refractive index (298.15 to 343.15) K were measured at atmospheric pressure and the influence of the alkyl chain and anion on these properties is discussed. The measured density, viscosity and refractive index of the present ionic liquids; [P 8,8,8,14]Cl and [P8,8,8,14][docusate] at 298.15 K -3 are (0.8858 and 0.9544) g cm , ( 1272.2 and 2960.3) mPa.s and (1.47832 and 1.46934) respectively. The density of the presnt IL is lower compared to the phosphonium ILs with short alkyl chain due to the increases free volume of the longer alkyl chain. The experimental values of density for the present ILs decrease linearly with increasing temperature as consequ ence of the large temperature difference between their working temperature range and their critical temperatures. The results show that these ILs possesses higher viscosities and similar refractive indices compared to the trihexyltetradecylphosphonium ILs. The higher viscosity of the present ILs when compared to [P 2, 2, 2 ,8][NTf2] and [P2, 2, 2, 12][NTf2] is due to the increased Van der Waals interactions results from the long alkyl chains of the phosphonium cation and the docusate anion. In addition, the higher viscosity of [P8,8,8,14][docusate] compared to [P8,8,8,14]Cl] is due to the long alkyl chain and large volume of the docusate anion which results in low ion mobility due to the electrostatic interaction between the cation and anion. MAT-O22 FUNDAMENTAL STUDY OF NEAT AND SODIUM DOPED BARIUM TITANATE K.Y. Chew and *M. Abu Bakar School of Chemical Sciences, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia E-mail: [email protected] Barium titanate is a well known high dielectric material. Neat barium titanate (BTO) was synthesized from precursors of barium hydroxide monohydrate and titanium (IV) isopropoxide via sol gel method and calcined at 900 °C. Surface microstructures o...
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