SDS与相反电荷的Bola两亲分子混合水溶液性质  被引量:4

Properties of Mixed Aqueous Solutions of SDS and Oppositely Charged Bola Amphiphiles

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作  者:裴晓梅[1] 黄娟[2] 宋冰蕾[1] 崔正刚[1] 

机构地区:[1]江南大学化学与材料工程学院食品胶体与生物技术教育部重点实验室,江苏无锡214122 [2]福州大学化学化工学院胶体与界面化学研究所,福建福州350108

出  处:《精细化工》2013年第9期1008-1013,共6页Fine Chemicals

基  金:国家自然科学基金(21203078);中央高校基本科研业务费专项资金(JUSRP111A06)~~

摘  要:考察了4个含有季铵头基的Bola两亲分子ArN-n—NAr(n=4,6,8,10)与SDS(十二烷基硫酸钠)混合水溶液的溶液性质。ArN-n-NAr/SDS混合体系表现出在降低表面张力效率(c20)和能力(γCMC)以及胶束生成能力(CMC)的明显增效。c20在混合水溶液中均比单纯组分低,在等电点(0.33)时出现最小值,分别为0.076mmol/L(n=4),0.048mmol/L(n=6),0.046mmol/L(n=8)和0.026mmol/L(n=10)。与单组分SDS相比,混合体系的CMC出现明显降低,其中ArN-10-NAr/SDS混合体系的CMC比SDS单组分降低了9倍多(从2.40mmol/L降至0.26mmol/L)。混合体系中ArN-m-NAr连接链的伸直长度分别为0.635nm(n=4),0.889nm(n=6),1.143nm(n=8)和1.397nm(n=10),通过与静电平衡距离(-0.9nm)比较得知气/液界面混合吸附层的外表层完全由SDS构成,ArN—n—NAr分子分布在亚表层,依据两头基间连接链长度的不同,ArN—n-NAr(n=4,6,8)采取横躺的方式,ArN-10-NAr采取直立的方式。Bola amphiphiles ( ArN-n-NAr, n = 4,6,8,10 ) with quaternary ammonium headgroups have been synthesized. The results show considerable enhancement in the efficiency (c20) and the effectiveness(CMC) in surface tension reduction as well as the ability of micelle formation( CMC ) in the mixed aqueous solutions. The minimum c20 value [ 0. 076 mmol/L ( n = 4 ), 0. 048 mmol/L ( n = 6 ), 0. 046 mmoL/L( n = 8 ) and 0. 026 mmol/L( n = 10) ] was obtained at cq = 0. 33 ( α1 represents the molar fraction of ArN-n-NAr) in the mixed aqueous solution. Compared with the pure SDS solution,the CMC of the mixed systems showed significant decrease. For the ArN-10-NAr/SDS system, the CMC decreased more than 9 times( from 2.40 mmoL/L to 0.26 mmol/L). The length of ArN-n-NAr spacer in the mixed solution was 0. 635 nm(n =4), 0. 889 nm(n =6) ,1. 143 nm(n =8) and 1. 397 nm(n = 10). The outer surface of the mixed adsorption layer at the air/water interface was totally composed of SDS while ArN-n-NAr was arranged at the sublayer neighboring the outside. The ArN-n-NAr molecules adopted lying( for n = 4,6,8 ) or perpendicular ( for n = 10 ) pattern according to the spacer length between the two headgroups of Bola amphiphiles.

关 键 词:Bola两亲分子 SDS 混合水溶液 表面活性 表面活性剂 

分 类 号:TE357.462[石油与天然气工程—油气田开发工程]

 

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