Two new classes of gemini cationic surfactants—hexanediyl-1,6-bis[(isopropylol) alkylammonium] dibromide {in the abbreviation form: C_nC₆C_n[iPr-OH] and C_nC₆C_n[iPr-OH]₂; alkyl: C_nH_2n + 1 with n = 9, 10, 12 and 14}—have been synthesized by interaction of alkyl bromides with N,N′-di-(isopropylol)-1,6-diaminohexane and N,N,N′,N′-tetra-(isopropylol)-1,6-diaminohexane. The surface tension, electrical conductivity, and dynamic light scattering (DLS) techniques were used to investigate the aggregation properties of the gemini cationic surfactants in aqueous solution. The formation of critical aggregates at two concentrations in an aqueous solution from obtained gemini cationic surfactants were determined via the tensiometric method. Thus, these gemini cationic surfactants start to form aggregates at concentrations well below their critical micelle concentrations (CMC). The surface properties and the binding degree (β) of the opposite ion were tested against the length of the surfactant hydrocarbon chain and the number of the isopropylol groups in the head group. By applying the DLS technique, it was explored that how the number of isopropylol groups in gemini cationic surfactants with C₁₂H₂₅ chain affects the sizes of micelles at concentrations greater than CMC. It was discovered that the obtained gemini cationic surfactants have a biocidal character.

中文翻译：

---

基于丙氧基化1，6-二氨基己烷和烷基溴化物的双子阳离子表面活性剂的表面和杀生物特性

两类新型双子阳离子表面活性剂-己二基-1,6-双[（异丙醇）烷基铵]二溴化物（缩写形式：C _n C ₆ C _n [iPr-OH]和C _n C ₆ C _n [iPr-OH ] ₂ ; 烷基：C _n H _{2n +1}n = 9、10、12和14}}-已通过烷基溴与N，N'-二-（异丙醇）-1,6-二氨基己烷和N，N，N'，N'-四- （异丙醇）-1,6-二氨基己烷。表面张力，电导率和动态光散射（DLS）技术用于研究双子阳离子表面活性剂在水溶液中的聚集性能。通过以下方法测定了由双子阳离子表面活性剂在水溶液中两种浓度下关键聚集体的形成张力法。因此，这些双子阳离子表面活性剂在远低于其临界胶束浓度（CMC）的浓度下开始形成聚集体。针对表面活性剂烃链的长度和头部基团中异丙醇基团的数目，测试了相反离子的表面性质和结合度（β）。通过使用DLS技术，研究了具有C ₁₂ H ₂₅链的双子阳离子表面活性剂中异丙醇基团的数量如何影响大于CMC的胶束的尺寸。发现所获得的双子阳离子表面活性剂具有杀生物特性。