7624

7096

كارشناسي ارشد

شيمي فيزيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1391

شانزده،109ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

يوسف غائب، عبدالرضا حاجي پور

20/1/92

بيژن نجفي، عليرضا نجفي

شيمي

ID7096

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Synthesis and Estimation of Thermo Physical Properties of Br nsted and Lewis Acidic Ionic Liquids Based on Quaternary Ammonium Cations at range Temperatures from 298 15 to 363 15 K Zeynab Heydari Pebdani z heydaripabdani@ch iut ac ir Date of Submission 2013 01 16 Department of chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Prof A R Hajipour Email haji@cc iut ac ir Abstract Due to the development of green chemistry in recent years researchers have been interested in the application of ionic liquids instead of common organic solvents Ionic liquids can also apply as green catalysts Room temperature ionic liquids RTILs have high thermal stabilities and can remain liquid in a wide range of temperature usually over 200 C More importantly the ILs shows low toxicity and high conductivity together so that they could be used as green alternatives to volatile organic solvents in electrochemical Regard to these unique features ILs have received an increasing attention for wide variety applications In spite of the interesting feature and practical importance of ILs there are limited literature reports on the accurate measurements of many of their fundamental physical and chemical properties at various temperatures Thus in this two project we wish to report the results of our studies on the physical electrochemical thermodynamic and transport properties of Br nsted acdic ionic liquids BAILs and Lewis ionic liquids Initial synthesized Br nsted acidic ILs and estimated physical propertises them tri butyl ammonium chlorid tri butyl ammonium nitrate tri butyl ammonium hydrogen sulfate and tri butyl ammonium di hydrogen phosphate binary mixture water also synthtetis and estimated physical properties Lewis acidic ionic liquids binary mixtures with DMSO Bu3NBn Cl 2 MClm MClm AlCl3 FeCl3 ZnCl2 SnCl4 CuCl2 which are historically among the most important and commonly used ILs The properties of ILs accurately measured at atmospheric pressure and several temperatures include density dynamic viscosity thermal stability surface tension refractive index ionic conductivity and thermal conductivity the ILs were then calculated from the measured as a function of the temperature from 20 C to 90 C Several techniques for example CHNS ICP TGA TLC 1H NMR FT IR MASS spectroscopy and UV Vis have used for measuring also was important in order to decide about their possible application as reaction media A common and effective way to evaluate the acidity of BAILs was the Hammett method Ho that we used them and pH pKa In the first poroje measured densities and the dynamic viscosities for the binary mixtures of BAILs with water at 20 C to 90 C As can be seen the density of all of the mixtures always decreases with temperature A very good linear correlation is observed for all compositions r 1 this linear behavior with temperature The experimental viscosity results of BAILs from this study are in good agreement with the very scarce data from the literature and are well represented by the Vogel Fulcher Tammann VFT equation Presence oxygen atoms perhaps make up high viscosity this ILs than other ILs Since the viscosities of ILs are essentially effective by the van der Waals interactions and H bonding have reported the influence of oxygen water on the physical properties of ILs It showen The thermal conductivity of ILs as a function of temperature It was also hypothesised that the temperature independent behaviour is associated with the high viscosity of the ionic liquids For second project we used of all relation and methodes for estimated and reported for thermophysical properties for Lewis ILs Keywords Ionic liquids Thermophysical properties Hammett acidity temperature dependence

يوسف غائب، عبدالرضا حاجي پور

بيژن نجفي، عليرضا نجفي