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Thermodynamic and k...
Thermodynamic and kinetic supercooling of liquid in a wedge pore
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- Nowak, D. (författare)
- University of Leeds
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- Heuberger, M. (författare)
- Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH),Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa),Swiss Federal Laboratories for Materials Science and Technology (Empa)
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- Zäch, Michael, 1973 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Christenson, H. K. (författare)
- University of Leeds
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(creator_code:org_t)
- AIP Publishing, 2008
- 2008
- Engelska.
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 129:15, s. 154509 (article no.)-
- Relaterad länk:
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Cyclohexane allowed to capillary condense from vapor in an annular wedge pore of mica in a surface force apparatus (SFA) remains liquid down to at least 14 K below the bulk melting-point T(m). This is an example of supercooling of a liquid due to confinement, like melting-point depression in porous media. In the wedge pore, however, the supercooled liquid is in equilibrium with vapor, and the amount of liquid (and thereby the radius of curvature r of the liquid-vapor interface) depends on the surface tension gamma(LV) of the liquid, not the interfacial tension between the solid and liquid. At coexistence r is inversely proportional to the temperature depression Delta T below T(m), in accordance with a recently proposed model [P. Barber, T. Asakawa, and H. K. Christenson, J. Phys. Chem. C 111, 2141 (2007)]. We have now extended this model to include effects due to the temperature dependence of both the surface tension and the enthalpy of melting. The predictions of the improved model have been quantitatively verified in experiments using both a Mark IV SFA and an extended surface force apparatus (eSFA). The three-layer interferometer formed by the two opposing, backsilvered mica surfaces in a SFA was analyzed by conventional means (Mark IV) and by fast spectral correlation of up to 40 fringes (eSFA). We discuss the absence of freezing in the outermost region of the wedge pore down to 14 K below T(m) and attribute it to nonequilibrium (kinetic) supercooling, whereas the inner region of the condensate is thermodynamically supercooled.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- temperature
- freezing-point
- kelvin equation
- solvation forces
- porous solids
- vapor-pressure
- capillary condensation
- cut mica sheets
- surface forces apparatus
- confinement
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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