Open AccessAn investigation of thermal stability and heat capacity of imidazolium based ionic liquids at elevated temperature
Author(s) -
Balaji Bakthavatchalam,
Khairul Habib,
R. Saidur,
Kashif Irshad,
Omar A. Hussein
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/863/1/012026
Subject(s) - ionic liquid , thermal stability , thermogravimetric analysis , differential scanning calorimetry , heat capacity , materials science , thermal analysis , phosphate , chemistry , thermal , organic chemistry , thermodynamics , physics , catalysis
In this paper, the thermal stability and specific heat capacities of four imidazolium based ionic liquids namely 1-ethyl-3-methyl imidazolium octylsulfate, 1-ethyl-3-methylimidazolium diethyl phosphate, 1,3-dimethyl-imidazolium dimethyl phosphate and 1-butyl-3-methylimidazolium chloride have been experimentally analysed using Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The thermal stability was assessed by conventional and high resolution modulated TGA with the temperature range of 0 to 700 °C. The specific heat capacity was measured by using DSC within the temperature interval of 0 to 200 °C. The factors influencing the thermal stability and heat capacity of ionic liquids were studied. The thermal analysis results indicate that 1-ethyl-3-methylimidazolium octylsulfate exhibited excellent thermal stability even at 440 °C while 1-ethyl-3-methylimidazolium diethyl phosphate obtained a maximum specific heat capacity of 4.52 J/g.K.