Crystallite size effects in chemisorption on dispersed metals

Farin, Dina

doi:10.1016/0021-9517(89)90250-9

Cited by 19 publications

(2 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plot of total number of molecules (a measure of the surface area) vs. an effective size for the moleeules produces a straight line plot on log-log axes, whose slope gives the surface dimension (Pfeifer, Avnir et al 1983;Pfeifer and Avnir 1983a;Pfeifer and Avnir 1983b;Pfeifer and Avnir 1983c;Avnir and Farin 1984;Pfeifer, Avniret al 1984a;Pfeifer, Avnir etal. 1984b;Farin, Peleg et al 1985;Daoud and Martin 1989;Elber 1989;Fripiat 1989;Le Mehaute 1989;Pfeifer and Obert 1989;Farin and Avnir 1989a;Farin and Avnir 1989b;Avnir and Farin 1990;Pfeifer and Cole 1990;Pfeifer, Obert et al 1990;LaBrecque 1992;Piscitelle and Segars 1992;Ludlow and Hoberg 1990).…”

Section: Direct Methodsmentioning

confidence: 98%

Fractal Surfaces

Russ

1994

414

175

View full text Add to dashboard Cite

Section: Direct Methodsmentioning

confidence: 98%

Fractal Surfaces

Russ

1994

414

175

View full text Add to dashboard Cite

“…Such geometries are in fact more common in the physical world than the classical Euclidean geometries, especially if we consider surfaces and porous structures such as aggregates or fractured objects. Some of the chemical topics studied by fractal analysis include surface accessibility to physisorption of small molecules, , surface-geometry effects on the adsorption of polymers, , estimation of the surface available for reactions between adsorbates, , particle size effects in physisorption and chemisorption, surface geometry effects on reactions with catalytic and noncatalytic fractal surfaces, − and growth of layers on mercury electrode …”

Section: Introductionmentioning

confidence: 99%

Fractal and Voltammetric Study of Linoleic Acid Adsorption at the Mercury/Electrolyte Solution Interface

2001

View full text Add to dashboard Cite

A new method, size-scaling of the hanging mercury drop electrode, is introduced and used to determine the fractal properties of the adsorbed layer and its dependence on fractional electrode coverage. Simultaneously, the adsorption process of linoleic acid at a mercury electrode surface has been studied by means of phase-sensitive ac voltammetry in 0.5 M NaCl electrolyte solution, pH 8.3, simulating seawater conditions. Three concentration domains that exhibit different fractal behavior characterize the adsorption process. In the first domain, corresponding to the fractional electrode coverage  < 0.5, the fractal dimension of the adsorbed layer D  2. Further increase in surface concentration (electrode coverage) is followed by a swift change in fractal dimension, reaching the peak value D  2.4. This indicates that, at fractional electrode coverage of 0.7 -0.8, depending on adsorption conditions, a second order phase change in the adsorbed layer of linoleic acid takes place. In the third domain, the fractal dimension rapidly decreases to D  2.0 and remains stable regardless of bulk concentration increase, reflecting formation of a rather uniform and homogenous layer of perpendicularly oriented molecules of linoleic acid. The observed changes of fractal dimension are result of restructuring of the adsorbed layer and 2 a change in the orientation of adsorbed molecules due to molecular interactions.The influence of electrode polarity on the adsorption process of linoleic acid and fractal properties of the adsorbed layer is discussed. Comparison with the apparent isotherm, obtained in a classical voltammetric way, shows that the analysis of fractal properties of the adsorbed layer provides a useful tool for studies of the adsorption process and a sensitive method for detection of phase changes.

show abstract