Synthesis,surface active and thermal properties of novel imidazolium cationic monomeric surfactants |
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| Affiliation: | 1. Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, India;2. Department of Applied Science, Punjabi University, Patiala 147002, India;1. SP Technical Research Institute of Sweden – Chemistry, Materials and Surfaces, Box 5607, SE-114 86 Stockholm, Sweden;2. KTH Royal Institute of Technology, Department of Chemistry, Surface and Corrosion Science, SE-100 44 Stockholm, Sweden;1. Rheinisches Institut für Umweltforschung an der Universität zu Köln, Abteilung Planetenforschung, Köln, Germany;2. Institut für Raumfahrttechnik und Weltraumnutzung, Universität der Bundeswehr München, Neubiberg, Germany;3. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA;4. Royal Observatory of Belgium, Brussels, Belgium;1. Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain;2. Research and Technology Food and Agriculture (IRTA), Torre Marimon, 08140 Caldes de Montbui, Spain;3. Polytechnic University of Catalonia (UPC), 08860 Castelldefels, Spain |
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| Abstract: | A series of long chain water soluble cationics have been synthesized by using renewable raw materials like fatty alcohols and epichlorohydrin. The surface activity of the molecules has been determined by measurement of their conductance and surface tension in aqueous solution. The dynamics of surface activity of these surfactants have also been investigated in the presence of sodium halides, NaCl and NaBr by surface tension measurement. A series of useful parameters like critical micelle concentration (cmc), surface tension at the cmc (γcmc), adsorption efficiency (pC20), effectiveness of surface tension reduction (Πcmc), Gibbs free energy of the micellization (ΔG0 mic) and Gibbs free energy of adsorption (ΔG0 ads) have been determined from the measurements obtained by surface tension and conductivity method. Further with the application of the Gibbs adsorption isotherm, maximum surface excess concentration (θmax) and minimum surface area/molecule (Amin) at the air–water interface were also estimated. Thermal stability of these long chain cationics has been measured by thermal gravimetric analysis under nitrogen atmosphere. Analysis of thermal stability measurement indicated that the thermal stability of these long chain imidazoliums increase with an increase in chain length. |
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| Keywords: | Long chain imidazolium cationics cmc Salt effect Thermal stability |
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