Colloids and Surfaces最新文献_第7页

Mechanisms for lowering of interfacial tension in alkali/acidic oil systems 1. Experimental studies 降低碱/酸性油体系界面张力的机理实验研究

Colloids and Surfaces Pub Date : 1992-11-10 DOI: 10.1016/0166-6622(92)80148-U

Jeff Rudin, Darsh T. Wasan

{"title":"Mechanisms for lowering of interfacial tension in alkali/acidic oil systems 1. Experimental studies","authors":"Jeff Rudin, Darsh T. Wasan","doi":"10.1016/0166-6622(92)80148-U","DOIUrl":"10.1016/0166-6622(92)80148-U","url":null,"abstract":"<div><p>Experimental studies are conducted in order to determine the physicochemical mechanisms responsible for lowering of interfacial tension in alkali/acidic oil systems. A well-defined model acidic oil is selected for controlled design of experiments, thus enhancing verification of known and unknown mechanisms. Ionic strength, pH, alkalinity, acid concentration and acid type were investigated for their effect on interfacial and surface tension. We show that interfacial tension goes through an ultralow minimum with NaOH (initial pH) at constant ionic strength. Unionized acid is shown to be present in the system at alkali concentrations where interfacial tension is ultralow. The results presented here suggest that the unionized acid adsorbs onto the interface together with the ionized acid, resulting in ultralow transient and equilibrium interfacial tension. Current theories do not consider adsorption of unionized acid on the interface, and, as a result, they do not adequately describe the effect of pH. A preliminary investigation of buffers shows that buffering the aqueous pH against dilution will also buffer the interfacial tension against dilution.</p></div>","PeriodicalId":10488,"journal":{"name":"Colloids and Surfaces","volume":"68 1","pages":"Pages 67-79"},"PeriodicalIF":0.0,"publicationDate":"1992-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-6622(92)80148-U","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87942982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 82

Electrokinetic sonic amplitude of colloidal poly(methyl methacrylate) and Ludox®-TM 胶体聚甲基丙烯酸甲酯和Ludox®-TM的电动声波振幅

Colloids and Surfaces Pub Date : 1992-11-10 DOI: 10.1016/0166-6622(92)80151-Q

R.T. Klingbiel , H. Coll , R.O. James , J. Texter

引用次数: 10

Capillary instability of a fast-draining film 快排膜的毛细不稳定性

Colloids and Surfaces Pub Date : 1992-11-10 DOI: 10.1016/0166-6622(92)80144-Q

L. Doubliez

引用次数: 3

Adsorption of anionic and amphoteric foam-forming surfactants on different rock types 阴离子和两性泡沫表面活性剂在不同岩石类型上的吸附

Colloids and Surfaces Pub Date : 1992-11-10 DOI: 10.1016/0166-6622(92)80146-S

Karin Mannhardt, Laurier L. Schramm, Jerry J. Novosad

{"title":"Adsorption of anionic and amphoteric foam-forming surfactants on different rock types","authors":"Karin Mannhardt, Laurier L. Schramm, Jerry J. Novosad","doi":"10.1016/0166-6622(92)80146-S","DOIUrl":"10.1016/0166-6622(92)80146-S","url":null,"abstract":"<div><p>Surfactant adsorption studies carried out with surfactants suitable for mobility control by foams in gas-flooding enhanced oil recovery are described. The extent of adsorption of three surfactants (an anionic surfactant, a betaine, and a sulfobetaine) is measured on four types of rock representing reservoir materials (berea sandstone, Indiana limestone, Baker dolomite and quartz) from three brines (a sodium chloride solution and two synthetic reservoir brines with different concentrations of total dissolved solids). This allows the assessment of the effects of surfactant type, rock type, brine salinity and the presence of divalent cations on surfactant adsorption. In order to probe into adsorption mechanisms, an attempt is made to correlate adsorption levels with rock surface charges.</p><p>Adsorption of the anionic surfactant on sandstone and dolomite is significantly lower than that of both amphoterics, while adsorption of the amphoterics on limestone is similar to or lower than adsorption of the anionic surfactant. The presence of divalent cations increases the adsorption of the anionic surfactant and the betaine on sandstone and limestone, but has very little effect on the adsorption of the sulfobetaine on all rocks, or on the adsorption of all three surfactants on dolomite. The effect of the total dissolved solids concentration in the brine on adsorption is different for different surfactant/rock combinations. A correlation of surfactant adsorption with rock surface charge shows that adsorption of the anionic surfactant is consistent with an electrostatic mechanism of adsorption. Adsorption of both amphoteric surfactants occurs through a complex interplay of mechanisms, some of which can be suggested from the observed trends.</p></div>","PeriodicalId":10488,"journal":{"name":"Colloids and Surfaces","volume":"68 1","pages":"Pages 37-53"},"PeriodicalIF":0.0,"publicationDate":"1992-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-6622(92)80146-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79944897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 42

The effects of free polymers on osmotic compression, depletion flocculation and fusion of lamellar liquid-crystalline droplets 游离聚合物对层状液晶液滴渗透压缩、耗尽絮凝和融合的影响

Colloids and Surfaces Pub Date : 1992-11-10 DOI: 10.1016/0166-6622(92)80154-T

J.C. van de Pas, C.J. Buytenhek

{"title":"The effects of free polymers on osmotic compression, depletion flocculation and fusion of lamellar liquid-crystalline droplets","authors":"J.C. van de Pas, C.J. Buytenhek","doi":"10.1016/0166-6622(92)80154-T","DOIUrl":"10.1016/0166-6622(92)80154-T","url":null,"abstract":"<div><p>The effects of free polymers on the physical properties of lamellar liquid-crystalline dispersions as model systems for active structured liquid detergents have been investigated. Addition of free polymers to lamellar dispersions may lead to osmotic compression (decrease in the volume fraction or lamellar phase), depletion flocculation and fusion of lamellar droplets. Osmotic compression will occur if the size of the polymer coil (e.g. molecular mass) is too large with respect to the lamellar water layer thickness. Depletion flocculation will occur, as found for normal dispersions, at lower polymer concentrations if the molecular mass of the polymer increases. Fusion of lamellar droplets, which results in an increase in lamellar droplet size, occurs at polymer concentrations lower than the polymer concentration at which depletion flocculation is observed. Extensive fusion is observed well above the critical polymer concentration for depletion flocculation. Osmotic compression and fusion result in a decrease in the viscosity of the lamellar dispersions and allow for concentration of the products based on lamellar dispersions while retaining pourability. Depletion flocculation results in physical instability and increased viscosity of the liquid detergents and has to be avoided.</p></div>","PeriodicalId":10488,"journal":{"name":"Colloids and Surfaces","volume":"68 1","pages":"Pages 127-139"},"PeriodicalIF":0.0,"publicationDate":"1992-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-6622(92)80154-T","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77699094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Miscibility of dodecylammonium chloride and octylsulfinylethanol in the adsorbed film and micelle 十二烷基氯化铵和辛基亚砜乙醇在吸附膜和胶束中的混溶性

Colloids and Surfaces Pub Date : 1992-11-09 DOI: 10.1016/0166-6622(92)80285-A

Kinsi Motomura, Tomoko Kanda, Koji Abe, Natsuko Todoroki, Norihiro Ikeda, Makoto Aratono

引用次数: 14

Chirality effects on 1H and 13C NMR chemical shifts for Aerosol OT in reverse micelles assisted by line shape simulations and two-dimensional pulse techniques 在线形模拟和二维脉冲技术的辅助下，手性对气溶胶OT在反胶束中的1H和13C NMR化学位移的影响

Colloids and Surfaces Pub Date : 1992-11-09 DOI: 10.1016/0166-6622(92)80287-C

Akihiro Yoshino , Nobuyuki Sugiyama , Hirofumi Okabayashi , Keijiro Taga , Tadayoshi Yoshida , Osamu Kamo

{"title":"Chirality effects on 1H and 13C NMR chemical shifts for Aerosol OT in reverse micelles assisted by line shape simulations and two-dimensional pulse techniques","authors":"Akihiro Yoshino , Nobuyuki Sugiyama , Hirofumi Okabayashi , Keijiro Taga , Tadayoshi Yoshida , Osamu Kamo","doi":"10.1016/0166-6622(92)80287-C","DOIUrl":"10.1016/0166-6622(92)80287-C","url":null,"abstract":"<div><p>For the <sup>1</sup>H NMR spectrum of sodium bis(2-ethylhexyl)sulfosuccinate (AOT) in C<sub>6</sub>D<sub>6</sub>D<sub>2</sub>O, the very complex H3′ signals, which have not yet been elucidated, have now been successfully explained by superimposition of the four AB parts, and have been discussed in connection with the diastereoisomers arising from the three asymmetric carbon atoms.</p><p>Discussion of the <sup>13</sup>C NMR signal assignment of AOT in organic solvents has previously been focused on the signals of the head group (CH(SO<sup>−</sup><sub>3</sub>)CH<sub>2</sub>) and on the CH<sub>2</sub>OCO and OCH<sub>2</sub>CH segments. In this study, the signals arising from the other segments of the two chains have been completely assigned to the individual carbon atoms of each 2-ethylhexyl chain, using pulse techniques.</p><p>The secondary splitting of the <sup>13</sup>C chemical shifts was due to the chirality effect of an AOT molecule. In particular, the effect of the chiral centers was found to be concentrated on the α chain and to reach the C6′carbon.</p></div>","PeriodicalId":10488,"journal":{"name":"Colloids and Surfaces","volume":"67 ","pages":"Pages 67-79"},"PeriodicalIF":0.0,"publicationDate":"1992-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-6622(92)80287-C","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79651799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Superhigh surface area determination of microporous solids 微孔固体的超高表面积测定

Colloids and Surfaces Pub Date : 1992-11-09 DOI: 10.1016/0166-6622(92)80299-H

K. Kaneko, C. Ishii

引用次数: 202

Expansion of mixed anionic—non-ionic micelles caused by solubilization of organic solutes 有机溶质的增溶引起阴离子-非离子混合胶束的膨胀

Colloids and Surfaces Pub Date : 1992-11-09 DOI: 10.1016/0166-6622(92)80283-8

Masahiko Abe , Yoshikazu Tokuoka , Hirotaka Uchiyama , Keizo Ogino , John F. Scamehorn , Sherril D. Christian

引用次数: 7

Solubilization of spiropyran in aqueous NaBr solutions of dodecyltrimethylammonium bromide 螺吡喃在十二烷基三甲基溴化铵NaBr水溶液中的增溶作用

Colloids and Surfaces Pub Date : 1992-11-09 DOI: 10.1016/0166-6622(92)80281-6

Shoichi Ikeda, Yoko Saso

{"title":"Solubilization of spiropyran in aqueous NaBr solutions of dodecyltrimethylammonium bromide","authors":"Shoichi Ikeda, Yoko Saso","doi":"10.1016/0166-6622(92)80281-6","DOIUrl":"10.1016/0166-6622(92)80281-6","url":null,"abstract":"<div><p>1,3,3-Trimethylindolino-6′-nitrobenzopyrilospiran is solubilized in aqueous NaBr solutions of dodecyltrimethylammonium bromide (DTAB). The dye is soluble in solutions of DTAB having concentrations higher than the critical micelle concentration. The solubilization power of DTAB is 2.08·10<sup>−3</sup> mol dye per mol DTAB at NaBr concentrations lower than 1.84 <em>M</em>, while it increases linearly with increasing NaBr concentration from 1.84–4.50 <em>M</em>. The constant solubilization power of DTAE is attributable to the spherical micelles, while its higher solubilization power in the presence of NaBr beyond 1.84 <em>M</em> can be ascribed to rod-like micelles. The solubilization capacity of a spherical micelle of DTAB ranges from 0.11–0.18, depending on the NaBr concentration, where the micelle aggregation number varies from 52–86. The rod-like micelle has an increasing solubilization capacity with increasing NaBr concentration, and it can solubilize the dye to such an amount that 136 DTAB molecules along its contour length incorporate one dye molecule. The solubilized dye is partly in the mecrocyanine form, and the solubilization locus has polarity corresponding to a dielectric constant ≈35.</p></div>","PeriodicalId":10488,"journal":{"name":"Colloids and Surfaces","volume":"67 ","pages":"Pages 21-27"},"PeriodicalIF":0.0,"publicationDate":"1992-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-6622(92)80281-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77098373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4