Abstract
The Kelvin equation can approximately describe the conditions required for the occurrence of capillary condensation–evaporation phenomena. Nonetheless, nucleation phenomena imply noteworthy deviations from the Kelvin prediction. Nucleation occurs in porous media during liquid–vapor transitions and this phenomenon certainly influences the appearances of adsorption–desorption isotherms. Nucleation plays indeed a capital role during capillary condensation whilst is mostly absent during capillary evaporation.
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Abbreviations
- ΔG :
-
Work of droplet formation
- ΔG*:
-
Free energy barrier associated to nucleation
- \( \Updelta G_{S}^{*} \) :
-
Free energy required for a new phase formation in the case of heterogeneous nucleation
- ΔG(V l):
-
Liquid phase work of formation
- ΔG ij :
-
Free energy change due to the formation of the interface between the phases i and j
- Δp*:
-
Critical supersaturation
- C lv :
-
Curvature of the liquid–vapor interface
- n :
-
Number of molecules
- n*:
-
Number of molecules threshold for droplet formation
- p :
-
Pressure
- p l :
-
Liquid pressure
- pv/p0:
-
Relative pressure
- p v :
-
Vapor pressure
- p 0 :
-
Vapor saturation pressure
- R :
-
Universal gas constant
- r p :
-
Pore size
- r :
-
Droplet size
- r*:
-
Critical radius
- r m :
-
Mean radius of curvature of the liquid–vapor interphase
- v l :
-
Molar volume of the liquid phase
- T :
-
Temperature
- β:
-
Wall crevice slope
- δ:
-
Pit mouth radius
- ρ:
-
Mean radius of curvature of a nucleation droplet
- φ:
-
Correction factor. A real number
- θ:
-
Contact angle at the three-phase line of contact
- σlv :
-
Liquid–vapor surface tension
References
Defay R, Prigogine I, Everett DH (1966) Surface tension and adsorption. Longmans Green & Co Ltd, Nova, London Chap XV
Fisher LR, Israelachvili JN (1979) Nature 277:548–549
Parlar M, Yortsos YC (1989) Colloid Interface Sci 132(2):425–443
Bories S, Prat M (2002) In: Ingham DB (ed) Transport phenomena in porous media II, Pergamon—Elsevier, Oxford, pp 276–315
Everett DH, Haynes JM (1972) J Colloid Interface Sci 38:125–137
Casanova F, Chiang CE, Li CP, Roshchin IV, Ruminski AM, Sailor MJ, Sculler IK (2008) EPL 81:26003
Carey VP (1992) Liquid–vapor phase-change phenomena. Hemisphere Publishing Corporation, Washington Chap 5
Talanquer V (2002) J Chem Educ 79(7):877–883
Gunther L (2003) Am J Phys 71(4):351–357
Wilt PM (1986) J Colloid Interface Sci 112:530–538
Carey VP (1992) Liquid–vapor phase-change phenomena. Hemisphere Publishing Corporation, Washington Chap 6
Ward CA, Johnson WR, Venter RD, Ho S, Forest TW, Fraser WD (1983) J Appl Phys 54(4):1833–1843
Bankoff SG (1958) AIChE J 4(1):24–26
Forest TW (1982) J Appl Phys 53(9):6191–6201
Everett DH (1967) In: Flood EA (ed) The solid gas interface, Dekker, New York, Chap 36
El-Yousfi A, Zarcone C, Bories S, Lenormand R (1991) Mécanisme de formation d’une phase gazeuse par détente d’un liquide en milieu poreux. C.R.A.S. Paris Série 2 1093–1099
Domínguez A, Bories S, Prat M (2000) Int J Multiph Flow 26:1951–1979
Acknowledgments
Thanks are given to CONACYT for the support provided under project No. 83659 “Estudio Fisicoquímico de la obtención y de las propiedades de los sólidos mesoporosos”. Thanks are also due to the SEP-PROMEP Network “Fisicoquímica de Sistemas Complejos Nanoestructurados”, Project “Estudio de Propiedades Fisicoquímicas de Sistemas Complejos Nanoestructurados. (UAM-I-CA-31 Fisicoquímica de Superficies)”.
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Ponce, M., Domínguez, A., Esparza, J.M. et al. Thermodynamic Study of Nucleation Effects on Vapor–Liquid Transitions Occurring in Porous Substrates. Top Catal 54, 114–120 (2011). https://doi.org/10.1007/s11244-011-9651-8
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DOI: https://doi.org/10.1007/s11244-011-9651-8