Abstract:

Water/TX-100/Hexanol/Octane reverse microemulsion system is studied by Microcalorimeter and FT-IR methods. The formation process of reverse microemulsions is an exothermic process and is a two step reaction. The first step is that hydrogen-bonds are formed between ether oxygen bonds of TX-100 monomers and water molecules, the second step is hydrogen-bond formation between ether oxygen bonds which are buried in aggregates and water molecules. Three types of water: bind water, trapped water, free water exist in this reverse microemulsion. This result is also proven by FT-IR. The stretch vibration peaks of hydroxyl of water are treated by curve-fitting method from 3035 cm-1 to 3700cm-1. The O-H stretch vibration frequency of trapped water, bind water and free water are 3550±20cm-1, 3400±20cm-1, 3220±20cm-1 respectively. Alkyl ether is prior to phenyl ether in acting with water because their polarity is different. Enthalpy contribution is the main driving force in the spontaneous formation...更多 of this reverse microemulsion. 

Key words: Microcalorimetry, FT-IR, Reverse microemulsion