Novel Ester-linked Anionic Gemini Surfactant: Synthesis,Surface-Active Properties and Antimicrobial Study

A novel anionic gemini surfactant containing an ester bond in the spacer group was synthesized using cardanol as the raw material and characterized by IR, ¹H NMR and ¹³C NMR. The surface properties of the gemini surfactant were investigated and compared with its corresponding single chain surfactant counterpart. It was found that this novel gemini surfactant exhibited a low critical micelle concentration value (1.9 mM) and good efficiency in reducing surface tension of water (33.6 mN/m). The gemini surfactant was found to have antimicrobial activity against Gram-negative (Escherichia coli and Pseudomonas aeruginosa), Gram-positive (Bacillus subtilis and Staphylococcus aureus) bacteria and fungi (Aspergillus niger, Aspergillus flavus, Candida albicans and Rhizopus stolonifer). The gemini as well as the corresponding single chain surfactant showed good antimicrobial activity against all pathogenic microorganisms studied and can be employed as an antimicrobial agent. The synthesized novel anionic gemini surfactant possesses an excellent wettability and low foamability.     

Synthesis,interface activity and oil flooding experiment with an authentic sandstone microscopic model of cationic gemini surfactant

In this work, a series of cationic gemini surfactants with different hydrophobic tails were prepared and characterized by element analysis, IR spectra, and ¹H NMR spectra. The influencing factors of physic-chemical properties of these surfactants were carefully studied. The critical micelle concentration (CMC) of all the surfactants ranged from 3.87 × 10^?4 mol L^?1 to 8.97 × 10^?4 mol L^?1 and the values (γ_cmc) also ranged from 28.62 mN m^?1 to 34.07 mN m^?1 at CMC level by surface tension experiments. The consequences of the oil/water interface tension experiments indicated that all these prepared surfactants could lower oil/water interface tension to ultra-low with the combination of Na₂CO₃. C₁₂-2-C₁₂, and C₁₄-2-C₁₄ were chosen as the representative to evaluate the displacement efficiency in the oil flooding experiments using authentic sandstone microscopic model. The results showed that these surfactants could effectively improve the displacement efficiency by 10–20%.     

以双子表面活性剂模板合成 碳酸钙-环糊精复合材料*

以阳离子双子表面活性剂溴化N,N,N’,N’-四甲基-N,N’-双十二烷基-1,6-己二铵（12-6-12）与阴离子表面活性剂十二烷基硫酸钠（SDS）混合系统,以及12-6-12/正丁醇/正辛烷/水微乳系统为模板,利用碳酸化法合成了具有贝壳珍珠层“砖-泥”结构碳酸钙-环糊精仿生复合材料。以X射线衍射（XRD）、红外光谱（IR）、透射电 镜（TEM）表征产品的组成与形貌。讨论了模板尺寸、电性与复合材料形貌的关系。提出了“砖-泥”式层状结构生成机制。     

Gemini表面活性剂的研究进展及其在皮革中的应用前景 Gemini表面活性剂的研究进展及其在皮革中的应用前景 Gemini表面活性剂的研究进展及其在皮革中的应用前景 Gemini表面活性剂的研究进展及其在皮革中的应用前景

Gemini表面活性剂以其独特的结构,表现出优异的表面活性。本文综述了Gemini表面活性剂的结构特点和优异性质,最后对其在皮革工业上的应用前景进行了展望。     

Gemini表面活性剂的性质与应用

Gemini表面活性剂结构特殊,性能优越,在石油、化工等领域有着重要的研究与应用前景.文中对Gemini表面活性剂的结构、性质及应用进行了综述.     

新型吉米奇(Gemini)季铵盐(NGA)的研制及其在VES清洁压裂液中的应用

本研究合成了一种新型的吉米奇(Gemini)季铵盐阳离子表面活性剂NGA-乙烯撑基双(十八烷基二甲基溴化铵),并对产物的表面活性及由产物配制的VES清洁压裂液的性能进行了测定。结果表明:其CMC为1.2×10~(-1) mol/L,r_(CMC)为30.7 mN/m;添加NGA 2.0%(wt),NaCl 4.0%(wt)配制的VES清洁压裂液体系具有良好的粘弹性及抗温稳定性能,最高抗温可达95℃,解决了传统季铵盐类清洁压裂液体系的添加量高、耐温性能差的缺点,具有良好的市场应用前景。     

Gemini表面活性剂的杀菌性能

采用双子表面活性剂16—4—16、十二烷基二甲基苄基氯化铵1227、异噻唑啉酮3种杀菌剂杀灭回注水中的硫酸盐还原菌（SRB）、铁细菌（FB）及腐生菌（TGB）3种细菌,并用绝迹稀释法对杀菌前后菌数进行测定。实验结果表明,杀菌剂双子表面活性剂和杀菌剂1227的杀菌效率均达到企业标准,且杀菌剂双子表面活性剂的杀菌效率达到99％以上,具有良好的耐药性,可将杀菌剂1227与杀菌剂双子表面活性剂交替应用于现场。     

新型gemini表面活性剂在三次采油中的应用研究

结合双子表面活性剂的结构及分类,综述其独特的性质,即高表面活性,良好的水溶性,高的增溶能力,优异的协同作用,独特的流变性,优良的润湿性等,并介绍了几种三次采油用的特殊双子表面活性剂(合成工艺简单型,环保型,复配型),指出优化合成工艺,开展复配研究,提高产品产率,开发新型产品(如杂双子表面活性剂)是未来发展方向。     

葡萄糖酰胺非离子双子表面活性剂的制备与表征

以烷基胺、1,3-二溴丙烷为主要原料,采用两步法合成了不同碳链长度(n=8、12、16)的N,N′-二烷基(8/12/16)-N,N′-二葡萄糖丙二酰胺非离子双子表面活性剂。通过FTIR与1 HNMR对产物的结构进行了表征,用悬滴法对其表面张力进行了测定,用动态光散射对其粒度分布进行了测定,用改进Ross-Miles法对样品的泡沫性能进行了测定。结果表明:合成的葡萄糖酰胺非离子双子表面活性剂(8/12/16)的临界胶束浓度(cmc)及γcmc分别为5.627×10-3 mol/L、4.42×10-4 mol/L、2.96×10-3 mol/L和36.20mN/m、30.22mN/m、46.35mN/m;双子表面活性剂溶液粒径分布在130～1050nm;双子表面活性剂泡沫性能良好。     

双子辛酸甘油酯的合成及性能

以正辛酸乙酯、甲酸乙酯、1,2-二氯乙烷、甘油和金属钠为原料合成了非离子gem in i型表面活性剂双子辛酸甘油酯,并以核磁共振氢谱和红外光谱对其结构进行了表征,测定了其表面活性和流滴性能,与单辛酸甘油酯进行性能对比。结果表明,该双子表面活性剂cm c为0.004 mmol/L,γcm c为30.0 mN/m;并且分散、乳化和流滴性能均优于单辛酸甘油酯。