Comparison of Surface-Active Properties of (Alkyloxycarbonylmethyl)trimethylammonium Chlorides and Alkyltrimethylammonium Chlorides
Comparison of Surface-Active Properties of (Alkyloxycarbonylmethyl)trimethylammonium Chlorides and Alkyltrimethylammonium Chlorides
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DOI：
10.1007/s11743-008-1097-z
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发表时间：
2009-05
影响因子：
1.6
通讯作者：
Y. Itoh;Ryogo Akasaka
中科院分区：
文献类型：
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作者：
Y. Itoh;Ryogo Akasaka
研究了含甜菜碱酯基的可裂解表面活性剂-（正烷氧羰基甲基）三甲基氯化铵作为分离试剂的表面活性性能。临界胶束浓度，分散能力，和发泡能力的烷基三甲基氯化铵具有相同的碳原子总数。N，N-二甲基-3-硝基苯胺、萘、芘和油橙子SS在前一种表面活性剂溶液中的溶解度等于或略小于相同烷基链长的后一种表面活性剂溶液中的溶解度。在pH 10和25 °C的缓冲溶液中，前者的碱水解产率在10 min内接近100%，pH 9时的产率取决于烷基链的长度。还发现这种类型的表面活性剂作为有效的分离试剂，其分散炭黑并将上述染料增溶到中性水溶液中，然后当加入少量过量的NaOH时，立即且几乎完全地将它们分离为沉淀物。
Surface-active properties of cleavable surfactants with a betaine ester group—(n-alkyloxycarbonylmethyl)trimethylammonium chlorides, used as separation reagents—were investigated. Critical micelle concentrations, dispersing powers, and foaming powers were comparable to those of alkyltrimethylammonium chlorides with the same total number of carbon atoms. On the other hand, the solubilities of the four hydrophobic dyesN,N-dimethyl-3-nitroaniline, naphthalene, pyrene, and oil orange SS in the former surfactant solutions were equal to or slightly smaller than those in the solutions of the latter surfactants with the same alkyl chain length. The alkali hydrolysis yields of the formers approached 100% in aqueous buffer solution at pH 10 and 25 °C within 10 min, and the yield at pH 9 was dependent on the alkyl chain length. This type of surfactant was also found to be as an efficient separation reagent which disperses carbon black and solubilizes the above dyes into aqueous neutral solution and then separates them instantaneously and almost perfectly as precipitates when a small excess of NaOH is added.