CAJ | 학술논문

为研究少量乙醇分子对纯水中氢键作用的影响，测量了0~10%体积浓度区间乙醇-水溶液和纯水中羟基伸缩振动的激光拉曼光谱，并根据不同样品拉曼光谱间的差分光谱分析了低浓度溶液中乙醇分子的水合作用。研究结果表明：当向纯水中加入少量乙醇分子至4%体积浓度的过程中，水分子的四面体氢键网状结构得到扩大，同时乙醇分子疏水基团周围的水分子间氢键作用也得到加强；随着溶液中乙醇浓度的增加，乙醇分子间由于疏水水合作用逐渐聚集到了一起，造成溶液中疏水基团与水分子总的作用面积减少，溶液中的水分子氢键网状结构变得松散，最终一些水分子会脱离氢键网状结构并以大小不等的团簇存在于溶液中，而乙醇分子的亲水基团则与其周围的自由水分子通过氢键缔合在一起。
위연구소량을순분자대순수중경건작용적영향，측량료0~10%체적농도구간을순-수용액화순수중간기신축진동적격광랍만광보，병근거불동양품랍만광보간적차분광보분석료저농도용액중을순분자적수합작용。연구결과표명：당향순수중가입소량을순분자지4%체적농도적과정중，수분자적사면체경건망상결구득도확대，동시을순분자소수기단주위적수분자간경건작용야득도가강；수착용액중을순농도적증가，을순분자간유우소수수합작용축점취집도료일기，조성용액중소수기단여수분자총적작용면적감소，용액중적수분자경건망상결구변득송산，최종일사수분자회탈리경건망상결구병이대소불등적단족존재우용액중，이을순분자적친수기단칙여기주위적자유수분자통과경건체합재일기。
In order to study the molecular interactions involved in dilute ethanol-water solutions, the OH stretching vibration spectra of ethanol-water solutions with the concentration range of 0-10 vol.% were measured, and the difference spectra of the samples were calculated. The hydration of ethanol molecule in the solutions of low concentration was analyzed based on the difference spectra. The result shows a very small amount of ethanol in the solution can enlarge the hydrogen bonding network in pure water, and the hydrogen bonding degree of water molecules around hydrophobic groups of ethanol molecules was also enforced. Ethanol molecules tend to aggregate together with increasing concentration, which was caused by hydrophobic hydration, and the hydrogen bonding network of water molecules become loosen due to this. As a result, some of the water molecules break away from the hydrogen bonding network, and transfer to small clusters of different size; at the same time, the hydrophilic groups of ethanol molecules associate with free water molecules through hydrogen bond.