Contrasting microscopic interactions determine the properties of water/methanol solutions  

作　　者：Carmelo Corsaro Francesco Mallamace Sebastiano Vasi Sow-Hsin Chen H. Eugene Stanley Domenico Mallamace 

机构地区：[1]CNR-IPCF Messina, Istituto per i Processi Chimico-Fisici, Viale F. Stagno D'Alcontres 37, 98158 Messina, Italy [2]Dipartimento MIFT, Sezione di Fisica, Universita di Messina, Viale F. Stagno D'Alcontres 31, 98166 Messina, Italy [3]Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA [4]Center for Polymer Studies and Department of Physics, Boston University, Boston, MA 02215, USA [5]Consorzio interuniversitario per lo sviluppo dei Sistemi a Grande Interfase - CSGI, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy

出　　处：《Frontiers of physics》2018年第1期51-56,共6页物理学前沿（英文版）

摘　　要：Herein we study the different microscopic interactions occurring in water/methanol solutions at dif- ferent methanol molar fractions, using NMR spctroscopy. Temperature was found to determine which interaction dominates. It was found that the mixing between water and methanol is non-ideal because of the presence of interactions like hydrophobicity and hydrophilicity. These results indicate that the competition between hydrophilic and hydrophobic interactions is different in different thermal regions, and that the physical properties of the solution are determined by the character of the solution itself, which in turn depends on the mole fraction of methanol and on the temperature.Herein we study the different microscopic interactions occurring in water/methanol solutions at dif- ferent methanol molar fractions, using NMR spctroscopy. Temperature was found to determine which interaction dominates. It was found that the mixing between water and methanol is non-ideal because of the presence of interactions like hydrophobicity and hydrophilicity. These results indicate that the competition between hydrophilic and hydrophobic interactions is different in different thermal regions, and that the physical properties of the solution are determined by the character of the solution itself, which in turn depends on the mole fraction of methanol and on the temperature.

关 键 词：aqueous solutions HYDROPHOBICITY NMR HYDROPHILICITY 

分 类 号：TH742[机械工程—光学工程] TQ223.121[机械工程—仪器科学与技术]