Health & Environmental Research Online (HERO)


Print Feedback Export to File
1609939 
Journal Article 
A comprehensive study of diffusion, thermodiffusion, and Soret coefficients of water-isopropanol mixtures 
Mialdun, A; Yasnou, V; Shevtsova, V; Königer, A; Köhler, W; Alonso de Mezquia, D; Bou-Ali, MM 
2012 
Yes 
Journal of Chemical Physics
ISSN: 0021-9606
EISSN: 1089-7690 
136 
24 
244512 
English 
22755592 
WOS:000305881100036 
We report on the measurement of diffusion (D), thermodiffusion (D(T)), and Soret (S(T)) coefficients in water-isopropanol mixtures by three different instrumental techniques: thermogravitational column in combination with sliding symmetric tubes, optical beam deflection, and optical digital interferometry. All the coefficients have been measured over the full concentration range. Results from different instruments are in excellent agreement over a broad overlapping composition (water mass fraction) range 0.2 < c < 0.7, providing new reliable benchmark data. Comparison with microgravity measurements (SODI/IVIDIL (Selected Optical Diagnostic Instrument/Influence of VIbration on DIffusion in Liquids)) onboard the International Space Station and with literature data (where available) generally gives a good agreement. Contrary to theoretical predictions and previous experimental expectations we have not observed a second sign change of S(T) at low water concentrations.