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Correlation between thermophoretic behavior and hydrophilicity for various alcohols⋆
Monika Bjelčić1, Doreen Niether1, Simone Wiegand2
1ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428, Jülich, Germany.
The European Physical Journal. E, Soft Matter
|May 31, 2019
Summary
The temperature dependence of the Soret coefficient in alcohols correlates with hydrophilicity, measured by the log P value. This finding extends previous observations for amides and sugars, suggesting a universal relationship for water-soluble molecules.
Area of Science:
- Physical Chemistry
- Thermodynamics
- Solution Behavior
Background:
- The Soret coefficient describes thermophoresis, the movement of molecules in a temperature gradient.
- Hydrophilicity, quantified by the 1-octanol/water partition coefficient (log P), influences molecular behavior in solutions.
- Previous studies linked the Soret coefficient's temperature dependence to log P for amides and sugars.
Purpose of the Study:
- To investigate the thermophoresis of mono- and polyhydric alcohols.
- To determine if the correlation between Soret coefficient temperature dependence and hydrophilicity (log P) extends to alcohols.
- To validate a universal relationship for water-soluble molecules.
Main Methods:
- Utilized infrared Thermal Diffusion Forced Rayleigh Scattering (IR-TDFRS), a holographic grating technique.
- Systematically studied the thermophoretic behavior of various mono- and polyhydric alcohols.
- Measured the temperature dependence of the Soret coefficient for these alcohols.
Main Results:
- The temperature dependence of the Soret coefficient for polyhydric alcohols was found to correlate with their hydrophilicity (log P).
- These alcohol data points align with the previously established master plot for amides and sugars.
- Demonstrated a consistent relationship between thermophoresis and hydrophilicity across different classes of water-soluble molecules.
Conclusions:
- The correlation between the Soret coefficient's temperature dependence and log P is applicable to mono- and polyhydric alcohols.
- This study confirms a universal principle governing the thermophoresis of diverse water-soluble compounds.
- Hydrophilicity is a key factor determining the thermal transport properties of molecules in solution.
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