表面活性剂和四烷基溴化铵的复配Ⅲ.四烷基溴化铵碳氢链长对离子型表面活性剂在气/液表面吸附行为的影响  

MIXING OF SURFACTANT AND TETRAALKYLAMMONIUM BROMIDE Ⅲ.Effect of the Hydrocarbon Chain Length of Tetraalkylammonium Bromides on the Adsorption of Ionic Surfactants at Air/water Interface

作　　者：赵剑曦[1] 陈晓东[1] 娄颖[2] 

机构地区：[1]福州大学化学系,福建福州350002 [2]大连理工大学精细化工国家重点实验室,辽宁大连116012

出　　处：《化学研究与应用》2000年第1期29-34,共6页Chemical Research and Application

基　　金：大连理工大学染料;表面活性剂精细化工国家重点实验室开放课题基金

摘　　要：本文考察了四烷基溴化铵 (TAAB)碳氢链长对离子型表面活性剂SDS和DTAB在气 /液表面吸附行为的影响。实验结果表明 ,与表面活性剂离子对应的添加剂反离子是影响其水溶液表面活性的主要因素 ,因而TAAB对SDS表现出明显的效应 ,对DTAB影响效果则和同浓度的NaBr类似。除了对表面活性离子头基电荷的静电屏蔽外 ,TAA+的碳氢基团和SD-碳氢链间还可能发生疏水相互作用 ,但后者受TAA+离子体积制约。TAAB对SDS在气 /液表面吸附行为的影响是上述几个因素的综合作用结果。Effects of the hydrocarbon chain length of tetraalkylammonium bromides (TAAB) on the adsorption of ionic surfactants (sodium dodecyl sulfate,SDS;and dodecyltrimethylammonium bromide,DTAB)at air/water interface have been examined by using surface tension measurements.The results showed that the electrolyte ions which are as the counterions of surface active component of surfactant play a main role in affecting the adsorption behavior of ionic surfactant at air/water interface and therefore TAAB strongly enhances the surface activities of SDS aqueous solution.By electrostatic attraction,the hydrophobic interaction between the hydrocarbon groups of TAA + and the alkyl chains of SDS take place.Such a hydrophobic interaction is pronounced in (Bu) 4NB case.At (Bu) 4NB =5 and 100 mmol·L -1 , ∏ cmc of SDS increases 4.2 and 6.2mN·m -1 , respectively, whereas pC 20 increases 2.0 and 2.1 units respectively as compared with the SDS aqueous solution without additive.

关 键 词：表面张力 降低能力 表面活性剂 四烷基溴化铵 

分 类 号：O647.2[理学—物理化学]