{"title":"精矿稳定性研究。非水乳液","authors":"E. Ruckenstein","doi":"10.1016/0166-6622(93)80008-4","DOIUrl":null,"url":null,"abstract":"<div><p>It is demonstrated that the depth of the potential well between two colloidal particles which interact via van der Waals interactions can be minimized if they are covered with a shell of adsorbed surfactant molecules whose Hamaker constant is near to that or the liquid medium. This result is used to explain some experimental observations (I. Sushumna, R.P. Gupta and E. Ruckenstein, J. Mater. Res., 7 (1992) 2884) which indicate that long-chain fatty acids with an alkyl side chain of 5–10 carbon atoms located far from the head group of the surfactant lead to lower paste viscosities than those without side chains or with longer side alkyl chains. It is also suggested that, in concentrated suspensions, the collective interactions when the pair interaction is attractive can lead to an effective repulsion component between two neighboring particles, and that this effect may contribute to the stability of the concentrated dispersions.</p></div>","PeriodicalId":10488,"journal":{"name":"Colloids and Surfaces","volume":"69 4","pages":"Pages 271-275"},"PeriodicalIF":0.0000,"publicationDate":"1993-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-6622(93)80008-4","citationCount":"12","resultStr":"{\"title\":\"On the stability of concentrates. Non-aqueous dispersions\",\"authors\":\"E. Ruckenstein\",\"doi\":\"10.1016/0166-6622(93)80008-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>It is demonstrated that the depth of the potential well between two colloidal particles which interact via van der Waals interactions can be minimized if they are covered with a shell of adsorbed surfactant molecules whose Hamaker constant is near to that or the liquid medium. This result is used to explain some experimental observations (I. Sushumna, R.P. Gupta and E. Ruckenstein, J. Mater. Res., 7 (1992) 2884) which indicate that long-chain fatty acids with an alkyl side chain of 5–10 carbon atoms located far from the head group of the surfactant lead to lower paste viscosities than those without side chains or with longer side alkyl chains. It is also suggested that, in concentrated suspensions, the collective interactions when the pair interaction is attractive can lead to an effective repulsion component between two neighboring particles, and that this effect may contribute to the stability of the concentrated dispersions.</p></div>\",\"PeriodicalId\":10488,\"journal\":{\"name\":\"Colloids and Surfaces\",\"volume\":\"69 4\",\"pages\":\"Pages 271-275\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1993-01-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0166-6622(93)80008-4\",\"citationCount\":\"12\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Colloids and Surfaces\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0166662293800084\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Colloids and Surfaces","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0166662293800084","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 12
摘要
结果表明,在两个通过范德华相互作用相互作用的胶体粒子表面覆盖一层Hamaker常数接近的表面活性剂分子或液体介质,可以使它们之间的势阱深度最小化。这个结果被用来解释一些实验观察(I. Sushumna, R.P. Gupta和E. Ruckenstein, J. Mater)。Res., 7(1992) 2884)表明,与没有侧链或侧烷基链较长的脂肪酸相比,具有5-10个碳原子的烷基侧链的长链脂肪酸,其膏体粘度较低,且远离表面活性剂的头基团。研究还表明,在浓悬浮液中,当对相互作用具有吸引力时,集体相互作用会导致两个相邻粒子之间产生有效的排斥分量,这种效应可能有助于浓悬浮液的稳定性。
On the stability of concentrates. Non-aqueous dispersions
It is demonstrated that the depth of the potential well between two colloidal particles which interact via van der Waals interactions can be minimized if they are covered with a shell of adsorbed surfactant molecules whose Hamaker constant is near to that or the liquid medium. This result is used to explain some experimental observations (I. Sushumna, R.P. Gupta and E. Ruckenstein, J. Mater. Res., 7 (1992) 2884) which indicate that long-chain fatty acids with an alkyl side chain of 5–10 carbon atoms located far from the head group of the surfactant lead to lower paste viscosities than those without side chains or with longer side alkyl chains. It is also suggested that, in concentrated suspensions, the collective interactions when the pair interaction is attractive can lead to an effective repulsion component between two neighboring particles, and that this effect may contribute to the stability of the concentrated dispersions.