https://scholars.lib.ntu.edu.tw/handle/123456789/62104
標題: | Effect of Molecular Structure on Wetting Behavior at the Air-Liquid Interface of Water + Alcohol Mixtures | 作者: | Yeh, Ming-Chih Lin, Ping-Chang Chen, Li-Jen |
公開日期: | 2004 | 卷: | 108 | 期: | 28 | 起(迄)頁: | 9955-9961 | 來源出版物: | Journal of Physical Chemistry B | 摘要: | In this study, the wetting behavior of binary water + alcohol mixtures was carefully investigated by using eight different short-chain alcohols. These binary mixtures exhibit liquid-liquid equilibrium over the experimental temperature range 10-40°C. The wetting behavior of the upper liquid (alcohol-rich) phase at the surface of the lower liquid (aqueous) phase can be determined according to the wetting coefficient resulting from the interfacial tension measurements. Molecular structure of alcohols plays an essential role in the wetting behavior. The purpose of this study is threefold. (1) The effect of the hydrocarbon chain length of alcohols was examined by employing water + 1-butanol (C4E0), water + 1-pentanol (C5E 0), and water + 1-hexanol (C6E0) three systems, where CiEj is the abbreviation of a nonionic polyoxyethylene alcohol CiH2i+1(OCH2-CH 2)jOH. The shorter chain alcohol has a stronger tendency to wet the surface of the aqueous phase. (2) The effect of number of oxyethylene groups of alcohols was investigated by using three mixtures, water + C6E0, water + C6E1, and water + C6E2. An interfacial phase transition from partial wetting to nonwetting was observed for water + C6Ej mixtures as the number of oxyethylene groups j increases from 1 to 2. (3) The effect of isomeric structures of alcohols on wetting behavior was investigated by studying three mixtures, water + 1-pentanol, water + 2-pentanol (2-C 5E0), and water + tert-pentanol (t-C5E 0). An interfacial phase transition from partial wetting to complete wetting occurs while the molecular structure of alcohols evolves from linear (C5E0) to near spherical (t-C5E0) shape. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/87045 http://ntur.lib.ntu.edu.tw/bitstream/246246/87045/1/13.pdf https://www.scopus.com/inward/record.uri?eid=2-s2.0-3442876405&doi=10.1021%2fjp0380531&partnerID=40&md5=9b7aa0baa4100b065a8963c51248fd9e |
ISSN: | 15206106 | SDG/關鍵字: | Adsorption; Alcohols; Binary mixtures; Ellipsometry; Gas chromatography; Interfaces (materials); Osmosis; Phase diagrams; Phase transitions; Surface tension; Ternary systems; Thermodynamics; Thermostats; Wetting; Amphiphilicity; Aqueous phase; Droplets; Nonwetting; Molecular structure |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。