复配条件对骨明胶-十二烷基硫酸钠体系表面活性的影响

利用骨明胶-十二烷基硫酸钠(SDS)复配体系,研究了时间、温度和pH值对复配体系表面活性的影响规律.结果表明时间2h,温度50℃,pH=6.9左右时,复配体系的表面张力最低;时间3h,温度50℃,pH=5.5左右时,复配体系的起泡力、乳化力较好;时间2h,温度60℃左右,pH=7.0时,体系的起泡力、乳化力最低;时间2h,温度50℃,pH=8.5左右时,体系的起泡力最高.     

温度及无机盐对LMEE和SDS混合溶液表面张力的影响

通过表面张力的测定,研究了温度和不同无机盐对月桂酸甲酯乙氧基化物(laurylmethylesterethoxylate,简称LMEE)与十二烷基硫酸钠(SDS)复配物表面张力及临界胶束浓度(CMC)的影响。研究表明:混合体系的CMC在很宽的复配比例内出现最低值,25℃、未加无机盐时可使CMC最低降至3 8×10-5mol/L;温度对复配体系表面张力的影响较小,温度上升复配物的CMC略有降低。3种价态无机盐的加入均可使复配物的CMC有所降低,但与单一表面活性剂相比,温度和无机盐对复配物的CMC影响均不大,说明复配体系的抗温变及抗盐能力均有增强。     

无机盐对SDS溶液表面张力的影响

通过最大气泡法表面张力的测定,研究了无机盐NaCk、CuCl2、ZnSO4、AICI,和Al2(SO4)3等对十二烷基硫酸钠(SDS)溶液表面张力的影响.结果表明:在一定浓度范围内,随着无机盐浓度的增大,SDS溶液的表面张力逐渐减小;相同浓度的不同无机盐,价态越高,对SDS溶液表面张力降低越明显,3种无机盐对SDS溶液表面张力影响程度依次为:NaCl＜ZnSO4＜Al2(SO4)3.     

N-辛基-2- 吡咯烷酮表面活性剂复配体系的研究

研究了３０℃下Ｎ 辛基吡咯烷酮（Ｃ８Ｐ） 分别与十二烷基硫酸钠（ＳＤＳ） 、十六烷基三甲基溴化铵（Ｃ１６ ＴＡＢ）的水溶液表面张力随浓度的变化。计算这２ 种复配体系中的分子相互作用参数βσ、βＭ 值分别为－２ ．７０ ,－２ ．７８ ,－ １．２７,－ ０．８７,并比较了这２ 种复配体系的协同效应     

阴,阳离子混合表面活性剂的表面活性表面张力,润滑能力和乳化能力

辛基苯基聚氧乙烯醚硫酸钠Ｃ８Ｈ１７Ｃ６Ｈ４（ＯＣ２Ｈ４）１０ＳＯ４Ｎａ（Ｃ８φＥ１０Ｓ）和十二烷基三甲基溴化铵Ｃ１１Ｈ２５Ｎ（ＣＨ３）３Ｂｒ（Ｃ１２ＮＭ）不仅能在水溶液中形成透明的均匀溶液，而且混合体系的临界胶团浓度（ｃｍｃ）和γｃｍｃ比单一组份的低得多，在Ｃ８φＥ１０Ｓ中引入的Ｃ１２ＮＭ３量小于１０％时，Ｃ８ψＥ１０Ｓ－Ｃ１２ＮＭ３的润湿能力不变，大于１０％时，润湿能力增加，超过２０％时，润湿能     

烷基糖苷-十二烷基甜菜碱复配性能及无机盐的影响

考察了非离子型表面活性剂烷基糖苷(APG)和两性表面活性剂十二烷基甜菜碱(BS-12)之间的复配性能,测定了不同摩尔比的APG和BS-12复配体系的表面张力、泡沫和乳化性能,并且研究了无机盐对复配体系表面活性的影响。结果表明,与单独任一表面活性剂体系相比,APG和BS-12复配体系具有较好的表面活性,呈现明显的协同增效作用;在摩尔比为3∶7时,复配体系的表面活性最高、起泡性能最好、形成的泡沫和乳状液最稳定,协同增效作用最显著。此外,无机盐的加入提高了复配体系的表面活性,当NaCl浓度为0.03 mol·L-1时,表面张力和临界胶束浓度最小,表面活性最高;而对于无机盐,其离子价态越高,提高表面活性程度越明显;相比之下,阳离子提高复配体系表面活性的能力大于阴离子。     

十二烷基苯磺酸钠对碳钢/3.5%NaCl-钼酸盐体系表面张力及缓蚀性能的影响

采用电化学阻抗谱、极化曲线和溶液表面张力分析研究了十二烷基苯磺酸钠(SDBS)对碳钢/3.5%NaCl-钼酸盐体系表面张力及缓蚀性能影响。结果表明,溶液中加入1～10mg/L的十二烷基苯磺酸钠可以使溶液的表面张力显著降低,并对碳钢电极具有一定的腐蚀性;SDBS与钼酸钠复配后,溶液表面张力降低,缓蚀性能增强,100mg/L的钼酸钠和10mg/L的SDBS复配后比单独使用相同浓度的钼酸钠缓蚀效率提高17%左右,研究说明溶液表面张力和金属/溶液界面的变化对金属的腐蚀过程及缓蚀剂的作用过程产生一定的影响。     

聚合单体对乳化剂临界胶束浓度和表面张力的影响

对十二烷基硫酸钠(SDS)在不同单体存在下的临界胶束浓度(CMC)和表面张力进行了测定.结果表明:加入亲水单体丙烯酸(AA)可使其CMC值明显降低,加入甲基丙烯酸-β-羟乙酯(HEMA)则使CMC升高,同时加入少量AA和HEMA时也使SDS的CMC降低;加入油溶性单体苯乙烯对SDS的CMC值影响不大.加入亲水单体AA或...     

十二烷基硫酸钠与两性表面活性剂复配体系表面性能及影响因素

通过测定表面张力、黏度、pH研究了十二烷基硫酸钠(SDS)与十二烷基磺基甜菜碱(SB)、月桂酰胺基甘氨酸(NL)之间的相互作用。结果表明:SB与SDS在摩尔比为3∶7时,体系的表面张力达到最低,cmc最小,即出现最大协同效应;在整个pH范围内,表面活性并不随溶液酸碱性的变化而变化。而NL与SDS的复配体系在摩尔比为3∶7到7∶3时,协同效应显著;并且在强酸条件下,体系的表面活性降低,有沉淀生成。     

烷基苯表面张力随温度的变化关系

<正> 表面张力是物理和传递过程中的重要基础数据。纯液体表面张力随温度的变化曾被多人研究过,最通用的是Van der Waals方程式:     

Interactions of aminoalkylcarbamoyl cellulosics and sodium dodecyl sulfate. I. Surface tension

We have compared the interactions between Polyquaternium 10 and sodium dodecyl sulfate (SDS) with similar complexes of mono and diquaternary aminoalkylcarbamoyl cellulose derivatives by measuring the surface tension of their aqueous solutions. The results indicate that reduction of surface tension of aqueous solutions occurs via the formation of highly surface active polymer–surfactant complexes. At approximately a 1 : 1 stoichiometric ratio of SDS to quaternary groups, a complex of low solubility forms which is more efficient at reducing surface tension than the surfactant alone. The ability of the polymer–surfactant complex to reduce surface tension appears to be independent of polymer architecture and dependent only upon adsorption of the surfactant species at the cationic polymer sites. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1091–1097, 1998     

Volumetric, Compressibility, and Surface Tension Studies on Micellization Behavior of SDS in Aqueous Medium: Effect of Sugars

The densities , velocities of sound , and surface tension , of anionic surfactant sodium dodecyl sulfate in presence of aqueous saccharides (fructose and maltose) with concentrations 0.01 and 0.10 mol kg^?1 have been reported over a wide temperature range (293.15–313.15 K) at an interval of 5 K. The apparent molar volume , isentropic compressibility , and apparent molar adiabatic compression values have been calculated using densities and velocities of sound data. Both, and vary non‐linearly at lower concentration of surfactant and tend to achieve linearity at higher concentration of surfactant in presence of saccharides. From the surface tension data, parameters like surface excess , minimum area occupied by the surfactant molecule at the saturated air/solution interface and surface film pressure have been computed. The effect of additives on these parameters has been discussed in terms of different types of the interactions pertaining in the micellar system. An attempt has also been made to draw an inference regarding the effect of these additives on the critical micelle concentration of the surfactant.     

R_(12)TAC-SDS混合溶液的表面张力和泡沫性能

测定了 3 十二烷氧基 2 羟丙基三甲基氯化铵 (R12 TAC)和十二烷基硫酸钠 (SDS)复配体系的表面张力和泡沫性能。实验表明 ,复配体系的CMC及γCMC均低于单一组分。当R12 TAC和SDS以等量比复配时 ,体系表现出良好的泡沫性能。其中起泡性参数Cs为 1.99mmol/L ,Rmv 为0 86 ,稳泡性参数Ct为 2 .5 0mmol/L ,t1/ 2 m 为 91.5s。对相互作用参数的计算表明 ,该复配体系具有强烈的增效作用     

一种新型阳离子表面活性剂的表面活性

测定了两种３ 烷氧基 ２ 羟基丙基三甲基溴化铵［ＣｎＨ２ｎ＋１ＯＣＨ２ＣＨ（ＯＨ）ＣＨ２Ｎ（ＣＨ３）３Ｂｒ,ｎ分别为８和１２］和十二烷基硫酸钠混合体系的表面张力和对二甲基黄的增溶能力。实验表明,此复配体系的表面活性高于单纯体系,二者相互作用强,混合溶液透明稳定,对二甲基黄的增溶作用高于单一组分;混合比为１∶１时表面活性和增溶能力最强。     

Surface Tensions of Hydrocarbons and Bitumens at High Temperatures and Pressures

A maximum bubble pressure apparatus, described in a previous publication, has been used at pressures to 13.9 MPa (2000 psig) and temperature to 623 K (350°C) to measure the static surface tension of several alkanes and paraffinic petroleum fractions, and two types of Alberta bitumens in contact with hydrogen, helium and hydrogen/methane mixtures. With hydrogen, the surface tensions of alkanes or mixtures of alkanes were nearly independent of pressure, whereas with helium surface tension increased significantly. With hydrogen/methane mixtures, the surface tension decreased in value as pressure increased, with the effect increasing at the higher methane concentrations. For the two bitumens used, the surface tension with hydrogen showed a 10–15% increase as pressure increased at constant temperature. Some discussion is also given concerning methods of predicting the effects of pressure and temperature in hydrogen/hydrocarbon systems.     

Aqueous and nonaqueous microemulsion systems with a palm oil-base emollient

Microemulsions with a palm oil-based emollient, i.e., medium-chain triglyceride (MCT), and water or glycerol, stabilized by two oppositely charged ionic surfactants and a medium-chain alcohol, were investigated. The results showed that only the water-in-MCT or the glycerol-in-MCT microemulsions were prominent. The maximum solubilization of the MCT emollient was higher in cetyltrimethyl ammonium bromide, i.e., the positively charged surfactant that contained a nitrogen atom, than the negatively charged surfactant sodium dodecyl sulfate. However, the results did not lend themselves for selecting any decisive factor that would explain the different solubilization behavior encountered in the investigated aqueous and nonaqueous systems.     

十二烷基硫酸钠与氟碳表面活性剂混合体系的溶液性能

测定新型非离子氟碳表面活性剂(Intechem-01)与十二烷基硫酸钠(SDS)混合体系的表面张力、cmc、泡沫性能,研究了两者之间的相互作用。结果表明:Intechem-01与SDS质量比为3:1时,体系表面张力最低,cmc最小,体系出现最大协同效应;并且Intechem-01显示了良好的稳泡性能,当其与SDS质量比为5:1时,混合体系25%析液时间可达99.2s。     

磁场处理对PFS溶液粘度和表面张力的影响研究

为了增强PFS(聚合硫酸铁)溶液的溶解度,提高水处理中混凝反应的效果,通过实验测定了PFS溶液在不同磁化参数下的粘度和表面张力,研究了不同磁化参数下PFS溶液粘度和表面张力的变化特征以及磁场对PFS溶液作用的记忆效应.实验结果表明:随着磁场强度和磁化时间的增加,PFS溶液的粘度和表面张力均会减小;磁场对溶液的作用具有一定的记忆效应,大概10 h左右.在电磁场作用下,PFS溶液的熵值减小,分子间氢键作用增加,磁化后液体有序度增加.