Abstract
The Langmuir–Blodgett (LB) technique has been employed for the construction of a model of interfacial supported ionic liquids (ILs) catalyst. In this model a hybrid LB film consists of three components: ionic liquids (imidazolium chloride with different length of substituent alkyl chain), catalyst carrier (saponite and laponite), and catalyst species (platinum nanocrystals). It was found imidazolium ILs with carbon number more than six in the alkyl substituents can form stable Langmuir monolayer over diluted clay dispersions. By recording surface pressure versus time (π–t) kinetic curves, we found that the adsorption of imidazolium ILs or platinum nanocrystals by clay elementary layers reaches equilibrium within 200 s, and the molar Gibbs free energy change −dG (kJ mol–1) for the adsorption lies in the range 0.34–5.6 kJ mol–1. Surface pressure versus area (π–A) isotherms revealed that platinum nanocrystals are adsorbed by the IL–clay Langmuir films at the air–water interface, and there are two phase trans...
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