Physical Adsorption by Homogeneous and Heterogeneous Solid Surfaces
Molecules adsorbed by a substrate may be held firmly at certain spots by strong chemical forces, or even by physical forces that, although comparatively weaker, are yet sufficiently greater than the desorption force endowed on the molecule by its thermal energy. Molecules that answer this description are said to be localized. Should the thermal energy be sufficiently great to counteract localization, yet not sufficiently great to cause complete desorption, the adsorbed molecules may be able to glide along the surface, overcoming small energy barriers to surface diffusion as they move from spot to spot. Molecules corresponding to this description are said to be mobile.
KeywordsAdsorption Isotherm Carbon Black Physical Adsorption Adsorptive Energy Isosteric Heat
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- 3.M. Polanyi, Verhandl. deut. physik. Ges. 16: 1012 (1914); ibid., 18: 55 (1916).Google Scholar
- 5.J. H. de Boer, The Dynamical Character of Adsorption, Clarendon Press (Oxford), 1953, pp. 172–174.Google Scholar
- 10.S. Ross and G. E. Boyd, New Observations on Two-Dimensional Condensation Phenomena, MDDC Report No. 864, U.S.A.E.C., 1947Google Scholar
- 13.B. B. Fisher and W. G. McMillan, J. Chem. Phys. 28: 549, 555, 563, (1958).Google Scholar
- 18.W.D. Machin and S. Ross, Proc. Roy. Soc. (London) 265A; 455.(1962)Google Scholar
- 19.D. M. Young and A.D. Crowell, Physical Adsorption of Gases, utterworths (London), 1962, pp. 247–276.Google Scholar
- R. J. Sips, Ibid., 18: 1024 (1950).Google Scholar
- 24.S. Ross and J. P. Olivier, On Physical Adsorption, Interscience (New York), 1964.Google Scholar
- 33.J. R. Sams, Jr., G. Constabaris, andG. D. Halsey, Jr., J. Phys. Chem. 64: 1689 (1960).Google Scholar