...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Effects of side chain length and degree of counterion binding on micellization of sodium salts of alpha-myristic acid alkyl esters in water: A thermodynamic study
【24h】

Effects of side chain length and degree of counterion binding on micellization of sodium salts of alpha-myristic acid alkyl esters in water: A thermodynamic study

机译：侧链长度和抗衡离子结合程度对水中α-肉豆蔻酸烷基酯钠盐胶束化的影响：热力学研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Temperature studies were performed on the micelle formation of a series of anionic surfactants, i.e. Na salts of alpha-sulfonatomyristic acid methyl, ethyl, and propyl esters (abbreviated as alpha-SMy.Me, alpha-SMy.Et and alpha-SMy.Pr, respectively) in water, paying special attention to the effects of the number of carbon atoms in the alkyl chain attached near the hydrophilic group (-SO3) on micellar properties, such as critical micellization concentration (cmc) and the degree of counterion binding (beta) or the degree of electrolytic dissociation of micelles (alpha). The correlation among cmc, beta, and hydrophobicity was discussed in terms of thermodynamic parameters or the changes in the Gibbs free energy, enthalpy, and entropy upon micelle formation (Delta G(m)(o), Delta H-m(o), and Delta S-m(o), respectively). The cmc of the alpha-SMy.series surfactants decreases with increased hydrophobicity, as is expected. The degrees of counterion binding (beta) are ca. 0.7 for alpha-SMy Me, ca. 0.6 for alpha-SMy.Et, and ca. 0.5 for alpha-SMy.Pr in line with increasing hydrophobicity of the side chain, indicating that the larger alkyl group near the headgroup leads to less Coulombic repulsion between headgroups. The absolute value of negative Delta G(m)(o) increases in the order alpha-SMy.Pr < alpha-SMy.Et < alpha-SMy.Me, in parallel with the increasing order of beta.A clear linear relation (the compensation rule) completely holds between Delta H-m(o) and Delta S-m(o) for each surfactant studied, as have been observed for different surfactants. [References: 31]
机译：对一系列阴离子表面活性剂的胶束形成进行了温度研究，这些表面活性剂是α-磺基原子热酸甲酯，乙酯和丙酯的钠盐（缩写为α-SMy.Me，α-SMy.Et和α-SMy.Pr分别在水中），要特别注意亲水基团（-SO3）附近连接的烷基链中碳原子数对胶束特性的影响，例如临界胶束浓度（cmc）和抗衡离子结合程度（ β）或胶束的电解解离度（α）。根据热力学参数或胶束形成时吉布斯自由能，焓和熵的变化，讨论了cmc，β和疏水性之间的相关性（Delta G（m）（o），Delta Hm（o）和Delta） Sm（o））。正如预期的那样，α-SMy系列表面活性剂的cmc随着疏水性的增加而降低。抗衡离子结合度（β）为约。 0.7对于alpha-SMy Me，对于alpha-SMy.Et为0.6，而对于α-SMy.Pr的值为0.5，与侧链疏水性的增加相一致，表明靠近头基的较大烷基导致较少的头基之间的库仑排斥。负Delta G（m）（o）的绝对值按alpha-SMy.Pr

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号