The Freundlich equation or Freundlich adsorption isotherm, an adsorption isotherm, is an empirical relationship between the quantity of a gas adsorbed into a solid surface and the gas pressure. The same relationship is also applicable for the concentration of a solute adsorbed onto the surface of a solid and the concentration of the solute in the liquid phase. In 1909, Herbert Freundlich gave an expression representing the isothermal variation of adsorption of a quantity of gas adsorbed by unit mass of solid adsorbent with gas pressure.[1] This equation is known as Freundlich adsorption isotherm or Freundlich adsorption equation. As this relationship is entirely empirical, in the case where adsorption behavior can be properly fit by isotherms with a theoretical basis, it is usually appropriate to use such isotherms instead (see for example the Langmuir and BET adsorption theories). The Freundlich equation is also derived (non-empirically) by attributing the change in the equilibrium constant of the binding process to the heterogeneity of the surface and the variation in the heat of adsorption.[2]
^Freundlich, Herbert. Kapillarchemie, eine Darstellung der Chemie der Kolloide und verwandter Gebiete. Akademische Verlagsgesellschaft, 1909.
^Adamson, A.W (1997). Physical chemistry of surfaces. p. 393.
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The Freundlichequation or Freundlich adsorption isotherm, an adsorption isotherm, is an empirical relationship between the quantity of a gas adsorbed...
This may be written in the following form, known as the Ostwald–Freundlichequation: ln p p s a t = 2 γ V m r R T , {\displaystyle \ln {\frac {p}{p_{\rm...
his honor Freundlichequation, an adsorption (adhesion of gas or liquid on solid) equation This page lists people with the surname Freundlich. If an internal...
equations has only one: as a result, it often fits the data on rough surfaces better than the Langmuir's equations. However, the Freundlichequation is...
energy of adsorption remains constant with surface occupancy, the Freundlichequation is derived with the assumption that the heat of adsorption continually...
Ostwald-Freundlichequation. Ostwald first published his finding in 1900, and his mathematical equation was refined by German chemist Herbert Freundlich in...
work of Sten Lagergren. Freundlichequation Ostwald–Freundlichequation Thixotropy Donnan, F. G. (1942). "Herbert Freundlich. 1880-1941". Obituary Notices...
structure and particle size, in regards to nanocrystals. The Ostwald-Freundlichequation below shows this relationship: l o g ( C s C α ) = 2 σ V 2.303 R...
always avoid the "negative adsorption" for one-component systems. Freundlichequation Langmuir adsorption model Brunauer–Emmett–Teller (BET) theory H....
total binding molecules on the beads. The Freundlich isotherm is given by: [CS] = Keq[C]1/n The Freundlich isotherm is used when the column can bind to...
32U(1): 174–175. Freundlich, Herbert (1907). "Über die Adsorption in Lösungen". Zeitschrift für Physikalische Chemie. 57U(1): 385–470. Freundlich, Herbert (1909)...
astronomer Erwin Finlay-Freundlich publicized Einstein's challenge to scientists around the world. In October 1911, Freundlich contacted astronomer Charles...
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1911, responding to Einstein's encouragement, German astronomer Erwin Freundlich contacted solar eclipse expert Charles D. Perrine in Berlin to inquire...
Telegraphenberg to house a solar telescope designed by the astronomer Erwin Finlay-Freundlich. The telescope supports experiments and observations to validate (or disprove)...
something that turns (or changes) when touched. It was invented by Herbert Freundlich originally for a sol-gel transformation. Bingham plastic Calcium Sulfate...
: 301 The centrality of his thesis focused towards the research on the Freundlich (or classical) adsorption isotherm, and Zeldovich discovered the theoretical...
have been shown to better fit the adsorption isotherm than Langmuir, Freundlich, and partition. The experiment studied the adsorption of organic molecules...
cosmology preferred by researchers. In the early 1950s, Erwin Finlay-Freundlich proposed a redshift as "the result of loss of energy by observed photons...
Cinderella Rockefeller: A Life of Wealth Beyond All-Knowing. New York: Freundlich Books, 1987. Ernst, Joseph W., editor. "Dear Father"/"Dear Son:" Correspondence...
Klein considered equations of degree > 4, and was especially interested in using transcendental methods to solve the general equation of the fifth degree...
Extensive additional information can be found in the articles by Martin Freundlich, Reinhold Rüdenberg and Mulvey. One effort was university based. In 1928...
1029/JZ070i022p05615. R. Weiss & G. Blum (1967). "Experimental Test of the Freundlich Red-Shift Hypothesis". Phys. Rev. 155 (5): 1412. Bibcode:1967PhRv..155...
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