Concentration and temperature dependence of the refractive index of ethanol-water mixtures: influence of intermolecular interactions.
The temperature and concentration dependence of the refractive index, nD(x, T), in ethanol-water mixtures agrees with previous data in the ethanol-rich concentration range. The refractive index versus concentration x determined at 20 degrees C shows the expected maximum at about 41 mol% water (22 mass% water). The temperature derivative of the refractive index, dnD/dT, shows anomalies at lower water concentrations at about 10 mol% water but no anomaly at 41 mol% water. Both anomalies are related to intermolecular interactions, the one in nD seems to be due to molecular segregation and cluster formation while the origin of the second one in dnD/dT is still not clear.
Riobóo
R J
RJ
Instituto de Ciencia de Materiales de Madrid (C.S.I.C.), Campus de Cantoblanco, E-28049-Madrid, Spain. rjimenez@icmm.csic.es
Philipp
M
M
Ramos
M A
MA
Krüger
J K
JK
D003198:Computer Simulation; D000431:Ethanol / Q000737:chemistry*; D008956:Models, Chemical; D012031:Refractometry; D012996:Solutions / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry*
D012996:Solutions; D014867:Water; D000431:Ethanol