Results 251 to 260 of about 131,158 (306)
Some of the next articles are maybe not open access.
Adsorption isotherms-microscopic modelling
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1977Abstract A lattice formalism using “spin variables” is employed to analyse multi-state models for the adsorption of neutral dipoles. In particular, a spin-1/2 (two-state) model incorporating permanent and induced dipole moments of the solvent and the organic adsorbate, substrate interactions, and discreteness of charge effects is analysed.
openaire +1 more source
Adsorption isotherms and thermal fluctuations
Physical Review B, 1996The influence of thermal fluctuations on adsorption isotherms is calculated within the context of a selfconsistent mean-field theory, and it is found that such fluctuations cannot be neglected in the analysis of adsorption data. This result arises from our observation that substrate-induced hindrance of thermal fluctuations can significantly alter the ...
, Mecke, , Krim
openaire +2 more sources
General purpose adsorption isotherms
Environmental Science & Technology, 1986The fitting of adsorption isotherm equations to experimental data is often an important aspect of data analysis. If the Langmuir and Freundlich isotherms are used, then consideration must be given to the proper weighting of the observations. Preferably nonlinear regression (nonlinear least squares) should be used since this enables these isotherms to ...
openaire +2 more sources
Adsorption isotherms on fractal substrata
Physical Review A, 1989Au moyen de simulations de Monte Carlo, on etudie les reactions de recombinaison limitee par diffusion et suivies de la desorption et de l'adsorption de particules isolees a partir de substrats fractals et multifractals. A partir des resultats on admet: a) l'adsorption dissociative et la desorption associative de molecules diatomiques et b) l ...
, Albano, , Mártin
openaire +2 more sources
Adsorption isotherms—A critique
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1973Summary The possibility or the impossibility of separating the particle and the electrode interactions is discussed in a wider context of the effects due to any two interaction potentials on the equation of state. The involved nature of the pressure dependence on two individually definable forces is illustrated through the Percus Yevick results for ...
openaire +1 more source
Quantitative Characterization of Adsorption Isotherms Using Isothermal Microcalorimetry
Journal of Pharmaceutical Sciences, 1996The integral heat of adsorption of water vapor on sodium benzoate samples was determined at various partial vapor pressures using a heat conduction microcalorimeter. An equation is presented to describe the calorimetric integral heat response (mJ/g of solid) as a function of relative humidity.
M, Pudipeddi +3 more
openaire +2 more sources
ISOTHERMAL AND NON-ISOTHERMAL MULTICOMPONENT ADSORPTION KINETICS
Chemical Engineering Communications, 1990The model equations in the relaxation form for the multicomponent kinetics of isothermal and non-isothermal adsorption, taking into account all major distinctive features of the interphase heat and mass exchange inside porous grains and at their surface (see points 1 to 4 below) for P (“pore”) and S (“solid”) models of mass transfer within porous ...
L.K. FILIPPOV, I.V. FILIPPOVA
openaire +1 more source
Freundlich's adsorption isotherm
Surface Science, 1973Abstract We present a brief derivation of Freundlich's adsorption isotherm using straightforeward methods of statistical mechanics. The assumption that the adsorbed atoms move in Morse potential wells of different depths leads to the observed compensation effect in the energy dependence of the occupation probability of surface sites, essential for ...
openaire +1 more source
Nature, 1951
THREE years ago, Huttig1 derived a multilayer adsorption isotherm which in most cases agrees with experiment up to higher relative pressures x = p/p0 (where p0 is vapour pressure of the liquid adsorbate) than the Brunauer–Emmett–Teller2 isotherm. Huttig's formula, however, is not in accord with the kinetic assumptions implied in the derivation and does
openaire +1 more source
THREE years ago, Huttig1 derived a multilayer adsorption isotherm which in most cases agrees with experiment up to higher relative pressures x = p/p0 (where p0 is vapour pressure of the liquid adsorbate) than the Brunauer–Emmett–Teller2 isotherm. Huttig's formula, however, is not in accord with the kinetic assumptions implied in the derivation and does
openaire +1 more source
Monomolecular adsorption isotherms
Journal of Colloid and Interface Science, 1980There is a mathematical similarity between Jovanovich and Langmuir isotherms. They can be derived from integration of the differential equation. (dθ/dp) = c(1 − θ)k, when k = 1 and k = 2, respectively. Other isotherms which satisfy certain theoretical conditions of monomolecular adsorption may also be derived from the differential equation when k is ⩾1.
openaire +1 more source