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Citation: Zhu Bu-Yao, Wu Li-Jun, Huang Jian-Bin, He Xu. Surface Chemical lnvestigation on Aqueous Solution of Sodeum Undecanoate and Sodium Undecenoate[J]. Acta Physico-Chimica Sinica, ;1998, 14(11): 1025-1029. doi: 10.3866/PKU.WHXB19981112 shu

Surface Chemical lnvestigation on Aqueous Solution of Sodeum Undecanoate and Sodium Undecenoate

1.
Chemistry College,Peking University,Beijing 100871

Received Date: 8 December 1997
Available Online: 15 November 1998

The CMCs, γcmcS and micropolarities of aqueous solutions of sodium undecenoate(UNDE) and sodium undecanoate (UNDA) have been studied by surface tension measurement and fluorescence method. It is revealed that double bond at the en of hydrophobic chain weakens its hydrophobicity, hence lowering the effectiveness of micelle formation and that of surface tension reduction. The limited adsorption amount is less, while micropolarity higher, in UNDE solution than those in UNDA's. Therefore, conformation of the hydrophobic chain in aggregates is infered to be more bending for UNDE. Changes of thermodynamic parameters in micellization and adsorption show smaller free energy reduction and larger increases in entropy and enthalpy for UNDE than those for UNDA.
- Sodium undecenoate,
- Sodium undecanoate,
- Surface activity,
- Thermodynamic parameters,
- Micropolarity
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