A study of the Solubility and Surface Tension of Aqueous Alcohol Solutions

• Main Authors: Ming Chun Tu, 涂名鈞
• Other Authors: Shi-Yow Lin
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/rk2g2r

碩士 === 國立臺灣科技大學 === 化學工程系 === 95 === According to the phase rule ( F=C-P+2 ), the degree of freedom (F) is zero for a two-components (C) and two-phases (P) solution system at specific temperature and pressure. It means that every physical property of such solution system should be fixed. However, we measured the equilibrium surface tensions of benzyl alcohol、phenethylalcohol and 1-octanol aqueous solutions using a video-enhanced pendant drop/bubble tensiometry. The data show that surface tension decreased with increasing alcohol concentration; even there exist two separated phases inside solution system. We apply UV/Vis spectrum to measure the bulk concentration of benzyl alcohol and find that content of benzyl alcohol in aqueous bulk phase increases even when second phase appears. A droplet of benzyl alcohol moved on the surface of 3wt% TX-405 aqueous spontaneously. A white film appears on the solution surface while the droplet is moving at the surface. We speculate that the white layer is a number of droplets of benzyl alcohol solubilizated in TX-405 aqueous solution.