{"title":"Solvents having high dielectric constants. XVI. Properties of colloids in N-methylacetamide","authors":"Lyle R Dawson, Djong Gie Oei","doi":"10.1016/0095-8522(65)90018-8","DOIUrl":null,"url":null,"abstract":"<div><p>CuS and As<sub>2</sub>S<sub>3</sub> sols in <em>N</em>-methylacetamide have been prepared and have been purified by electrodialysis. Both sols were found to carry negative charges.</p><p>Flocculation values were determined using solutions of NaI and of CaCl<sub>2</sub> in NMA at 40°C. The experimental values for both sols were considerably higher than for similar systems in water.</p><p>As<sub>2</sub>S<sub>3</sub> sols in NMA exhibit very unusual stability, showing no flocculation after three months.</p><p>The CuS sol was found to be inherently unstable in NMA and to dissolve in a few days. Coordination of NMA molecules around the Cu<sup>++</sup>, ion and the very high dielectric constant of the medium may contribute to this behavior.</p></div>","PeriodicalId":15437,"journal":{"name":"Journal of Colloid Science","volume":"20 3","pages":"Pages 282-285"},"PeriodicalIF":0.0000,"publicationDate":"1965-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0095-8522(65)90018-8","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Colloid Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0095852265900188","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
CuS and As2S3 sols in N-methylacetamide have been prepared and have been purified by electrodialysis. Both sols were found to carry negative charges.
Flocculation values were determined using solutions of NaI and of CaCl2 in NMA at 40°C. The experimental values for both sols were considerably higher than for similar systems in water.
As2S3 sols in NMA exhibit very unusual stability, showing no flocculation after three months.
The CuS sol was found to be inherently unstable in NMA and to dissolve in a few days. Coordination of NMA molecules around the Cu++, ion and the very high dielectric constant of the medium may contribute to this behavior.
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