Volumetric Properties of Dilute Aqueous Alcohol Solutions at Different Temperatures
Volumetric Properties of Dilute Aqueous Alcohol Solutions at Different Temperatures
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不同温度下稀酒精水溶液的体积性质
DOI：
10.1246/bcsj.67.1580
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发表时间：
1994
影响因子：
4
通讯作者：
K. Nitta
中科院分区：
文献类型：
--
作者：
M. Sakurai;Kunio Nakamura;K. Nitta
在5 ° C、15 ° C、25 ° C、35 ° C和45 °C下，通过离心管密度计测量了正醇（从甲醇到1-己醇）和支链醇（2-丁醇、2-甲基-1-丙醇和2，2-二甲基-1-丙醇）的稀水溶液的密度。测定了醇在水溶液中的表观摩尔体积。讨论了极限偏摩尔体积、过量偏摩尔体积、浓度依赖性和亚甲基对体积的贡献随温度的变化关系。还尝试了基于使用特定单位而不是摩尔单位的替代分析。醇水溶液的特征体积行为对于短链或支链醇而不是疏水性醇更明显。没有明确的证据表明，所谓的疏水水化周围的烷基醇在水中是伴随着一个显着的体积变化。负偏摩尔膨胀等独特的性质可能来源于其分子结构。
The densities of dilute aqueous solutions of normal alcohols (from methanol to 1-hexanol) and branched-chain alcohols (2-butanol, 2-methyl-1-propanol, and 2,2-dimethyl-1-propanol) were measured at 5, 15, 25, 35, and 45 °C by means of an oscillating-tube densimeter. The apparent molar volumes of the alcohols in aqueous solutions were determined. The temperature dependences of the limiting partial molar volume, excess partial molar volume, concentration dependence, and methylene group contribution to volume were discussed. An alternative analysis based on the use of specific units instead of molar units was also attempted. The characteristic volumetric behavior of aqueous alcohol solutions is more pronounced for shorter- or branched-chain alcohols rather than hydrophobic alcohols. There is no definitive evidence that so-called hydrophobic hydration around the alkyl groups of alcohol in water is accompanied by a prominent volume change. The unique properties, such as negative partial molar expansion, may ori...