Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (02): 122-126.doi: 10.3866/PKU.WHXB20020206

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Influence of Alcohol on the Properties of Colloidal Liquid Aphrons

Hu Wei;Ye Ru-Qiang;Wu Shu-Sen;Liu Hong-Lai   

  1. Department of Chemistry,East China University of Science and Technology Shanghai 200237
  • Received:2001-07-09 Revised:2001-10-09 Published:2002-02-15
  • Contact: Ye Ru-Qiang

Abstract: This work examined the shape,half-life,Zeta potential and other properties of colloidal liquid aphrons (CLA),whose aqueous phase is composed of de-ionized water and alcohol.The volume ratio of water to alcohol varies while the concentration of water-soluble surfactant does not change.It is found that the existence of alcohol in the aqueous phase will affect the surface tension between the oil and water phase,hence the particle size and distribution of CLA will change.The influence of alcohal on the Zeta potential of CLA is very weak.The main cause of the change of stability is that alcohol molecule is embedded into the SDBS layer and a mixed soapy film is formed,which changes the intensity of the soapy film .The viscosity of the aqueous phase change also,which affects the process of drainage.When the concentration of alcohol reaches 30%,the most stable CLA appears,while the worst stable one appears at 50%.   In the application of pre-dispersed solvent extraction,we need a stable and small-sized CLA with a large matter transferring area,and the cost should be low.This will be benefit for the industrialization of the method.The results of this work prove that by adding alcohol into the aqueous phase ,we can get the CLA with great satisfactory for industrial use.

Key words: Alcohol, Colloidal liquid aphrons(CLA), Aphrons, SDBS, Stability