Effects of Temperature on the Viscosity of Nonionic Micellar Solution in the Presence of Salts

Chem. J. Chinese Universities ›› 1992, Vol. 13 ›› Issue (6): 824.

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Effects of Temperature on the Viscosity of Nonionic Micellar Solution in the Presence of Salts

HUANG Zhi-zhen¹, CHEN Zong-qi¹, XUE Mei-ling¹, SHI Cai-yun²

1. Department of Applied Chemistry, Qingdao Institute of ChemicalTechnology, Qingdao, 266042;
2. Department of Chemistry, Huazhong University of Science and Technology, Wuhan, 430074

Received:1991-06-25 Online:1992-06-24 Published:1992-06-24

Abstract

Abstract: The effects of temperature on the viscosity of nonionic surfactant, OP, in the presence of the added salts are presented.It is found that the plots of logarithm of the relative viscosity vs 1/T are linear.The activation free energies (△G^*) of the viscous flow were obtained from the slopes of these plots.The activation enthalpies (△H^*) and entropies (△S^*) for the viscous fluid were calculated out and the entropic contribution was found to be negligible.△G^* and △H^* were highly dependent on the ethylene oxide number and the nature of positive ions.The △G^* is interpreted in terms of the energy required to create a hole or an activated transition micellar structure capable of being transformed into smaller spherical mecelles.

Key words: Viscosity, Nonionic surfactant solution, Thermodynamic function

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HUANG Zhi-zhen, CHEN Zong-qi, XUE Mei-ling, SHI Cai-yun. Effects of Temperature on the Viscosity of Nonionic Micellar Solution in the Presence of Salts[J]. Chem. J. Chinese Universities, 1992, 13(6): 824.

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Effects of Temperature on the Viscosity of Nonionic Micellar Solution in the Presence of Salts

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