共查询到19条相似文献,搜索用时 62 毫秒
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采用分子动力学方法研究了磺酸盐型阴离子Gemini表面活性剂在油/水界面的吸附行为,考察了不同长度的连接基(Spacer)对表面活性剂在界面的聚集形态及界面性质的影响.密度分布和微观结构信息显示,Gemini表面活性剂能在油/水界面形成单层膜结构.Gemini表面活性剂能使油/水界面的厚度显著增大,并使界面形成能降低.... 相似文献
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以天然生物质腰果酚、1,3-二溴丙烷及氯磺酸为原料,通过醚化、磺化及中和三步反应合成了一类新型的腰果酚基磺酸盐双子(Gemini)表面活性剂.采用傅立叶转换红外光谱仪和核磁共振谱仪表征了产物的结构;采用滴体积法测定了腰果酚Gemini表面活性剂的表面张力,研究了水溶液的表面性质,并与相应的单基腰果酚基磺酸盐表面活性剂进行了对比.结果表明:腰果酚Gemini表面活性剂水溶液的临界胶束浓度(cmc)为6.20×10-2 mmol.L-1,远小于相应的单基腰果酚表面活性剂水溶液的cmc(8.40mmol.L-1);其临界表面张力γcmc为36.92mN.m-1,与单基腰果酚表面活性剂水溶液的相近(γcmc为38.41mN.m-1).与此同时,腰果酚Gemini表面活性剂水溶液的最小分子截面积Amin为0.27nm2,比相应的单基表面活性剂水溶液的小得多. 相似文献
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Gemini型甜菜碱结合了甜菜碱和Gemini型表面活性剂的优点,可以在较低浓度下达到超低油水界面张力、配伍性好、耐温耐盐性好、Krafft点以及吸附量低,被广泛应用于日用化学、化学化工、纳米材料、生物技术和石油开采等领域。本文基于间隔基的类型介绍了近年来Gemini型甜菜碱表面活性剂方面的最新研究进展。重点阐述了对称胺型、三嗪环型、二卤代物型Gemini甜菜碱的合成方法,并从原料成本、产率、反应周期以及产物的性能等方面对合成方法进行了分析和比较。最后对Gemini型甜菜碱表面活性剂的发展进行了展望。 相似文献
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A new anionic, hydrolysis-resistant polymerizable surfactant: synthesis and polymerization 总被引:3,自引:0,他引:3
The synthesis and some surfactant properties of a new type of sulfonated anionic monomer which is useful for free-radical
polymerization are described. The monomer is based on the isobutenyl moiety as a reactive group. Higher homologues behave
as polymerizable surfactants (“surfmers”). Copolymerization with a number of standard monomers is possible, as well as homopolymerization
under micellar conditions.
Received: 1 December 1998 Accepted in revised form: 11 March 1999 相似文献
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The interactions between β‐cyclodextrin (β‐CD) and the mixtures of cationic‐anionic surfactants in the aqueous solution were investigated by surface tension, rheology, and dynamic light scattering measurements. It was shown that the key‐lock interactions between β‐CD and mixed cationic‐anionic surfactants were stronger than the electrostatic/hydrophobic interactions between cationic and anionic surfactants. The inclusion of β‐CD to surfactants could destroy the ion‐pair and aggregates of cationic‐anionic surfactants, and even inhibited the precipitation of the mixed cationic‐anionic surfactants. Furthermore, the inclusion of β‐CD to surfactants could also destroy the hydrogen bond between β‐CD molecules, inducing the disassociation of the aggregation formed by β‐CD themselves. 相似文献
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荧光探针法研究新型Gemini表面活性剂在水溶液中的聚集行为 总被引:1,自引:1,他引:0
以芘为荧光探针、二苯酮为猝灭剂,用稳态荧光探针法测定了新型Gemini表面活性剂的临界胶团浓度(CMC)、胶团聚集数(Nagg)及胶团微极性.研究了Gemini表面活性剂结构和氯化钠浓度对CMC、Nagg、胶团微极性的影响.结果表明,新型Gemini表面活性剂的CMC比常规表面活性剂的CMC低1—2个数量级.当疏水基碳原子数增加时,CMC依次降低,Nagg增大,胶团微极性减小.当氯化钠浓度增大时,Nagg增大,胶团微极性减小. 相似文献
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An optical sensor for the detection of anionic surfactants was developed. The optical sensing membrane is a 2-nitrophenyloctyl ether-plasticized poly(vinyl chloride) membrane incorporating a lactone-form Rhodamine B (L-RB). The response of the optical membrane to anionic surfactants was a result of the ion-pair coextraction of an anionic surfactant and a proton into the PVC membrane. The L-RB forms an ion associate with the extracted anionic surfactant; simultaneously, the formed L-RB ion associate is accompanied by a spectral change. Namely, the extracted anionic surfactant changes the color of the membrane from light pink to dark pink (absorption maximum; 558 nm). The optical membrane responds to anionic surfactants, such as dodecylbenzenesulfonate, dodecylsulfate and di-2-ethylhexyl sulfosuccinate in the concentration range from 1 to 50 microM. 相似文献
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Ya. R. Bazel I. P. Antal V. M. Lavra Zh. A. Kormosh 《Journal of Analytical Chemistry》2014,69(3):211-236
Methods for the determination of synthetic anionic surfactants published in the past two decades are considered, and their advantages and disadvantages are demonstrated. Spectrophotometric and potentiometric (with the use of ion-selective electrodes) techniques, including flow injection analysis versions, are used for the determination of anionic surfactants. Chromatographic techniques (primarily, high-performance liquid chromatography) are most frequently used for the separation, preconcentration, and determination of anionic surfactants in complex mixtures. Spectrofluorimetry, voltammetry, and immunoassay did not find wide application. 相似文献
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Ethoxylated anionic polymer surfactants were suggested as collectors for a sludge flotation. The mechanism of fixing anionic surfactants on the clay-carbonate slimes was examined by FTIR spectroscopy and electron microscopy. 相似文献
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The surfactant to dye binding degree (SDBD) method is proposed for the routine monitoring of anionic surfactants in aqueous environmental samples and their analytical features compared with those provided by the standard methylene blue (MB) method. This new analytical approach is based on the effect that anionic surfactants exert on the binding degree of the cationic surfactant didodecyldimethylammonium bromide (DDABr) to the anionic dye Coomassie Brilliant Blue G (CBBG). The formation of DDABr-CBBG aggregates is monitored photometrically. The analytical applicability of the proposed method was demonstrated by determining anionic surfactants in tap, river and swamp water, and raw and treated sewage. The mean recoveries obtained ranged between 99 and 101%. The SDBD method offers important advantages over the classical MB method: it is more sensitive, selective, precise, simple and rapid; the analytical response is independent of the molecular structure of the anionic surfactants, and the volume of sample required for analysis and the consumption of organic solvents are significantly reduced. 相似文献
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Aggregation‐Induced Emission Active Probe for Light‐Up Detection of Anionic Surfactants and Wash‐Free Bacterial Imaging 下载免费PDF全文
Dr. Meng Gao Luochao Wang Junjian Chen Shiwu Li Guanhai Lu Dr. Lin Wang Prof. Dr. Yingjun Wang Prof. Dr. Li Ren Prof. Dr. Anjun Qin Prof. Dr. Ben Zhong Tang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(15):5107-5112
Anionic surfactants are widely used in daily life and industries, but their residues can cause serious damage to the environment. The current detection methods for anionic surfactants suffer from various limitations and a new detection strategy is highly desirable. Based on 2‐(2‐hydroxyphenyl)benzothiazole fluorogen with aggregation‐induced emission characteristics, we have developed a fluorescent probe HBT‐C18 for selective and sensitive detection of anionic surfactants. By in situ formation of catanionic aggregates or micelles with anionic surfactants, the emission intensity of the HBT‐C18 probe can increase with increasing keto/enol emission ratio through restriction of intramolecular motion and excited‐state intramolecular proton‐transfer mechanisms. The probe can also be used for wash‐free imaging of bacteria enveloped by a negatively charged outer membrane. The results of this study provide a new strategy for sensitive detection of anionic surfactants and wash‐free bacterial imaging. 相似文献