ChemInform Abstract: Electrocrystallization: Nucleation and Growth of Nano‐Clusters on Solid Surfaces

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Electrochemical nucleation and growth of black and white chromium deposits onto stainless steel surfaces

“…It has been shown that the potentiostatic technique is a powerful tool for elucidating the mechanisms of formation of new phases during electrocrystallization processes [8][9][10][12][13][14][15][16][17][18][19][20][21][22][23][24]. As nitrates play a major role in the formation of chromium coatings with photothermal properties [6], analysis of the electrocrystallization mechanism of Cr 2 O 3 on steel must be well defined, cf.…”

Test of Nucleation Models from Compiled Data

“…For a simplicity in the data treatment, it will be assumed that this consideration holds and then, in equations (8), (10), (14), (15) In those systems where the number of nuclei N was reported for an instantaneous nucleation, it was assumed that J ∝ N [1,23] and then similar equations to eqs. (14), (15) and (16) were used.…”

“…Lower values of Φ(1) could indicate a strong interaction with the substrate, as in the case of PbSO 4 on Hg/Pb amalgam. ), Φ(1) and ∆G(1) for some systems: (a-c) presented in Table 1, and (d-f) reported in [23]. Overpotential at the point of change of n * , η, expressed in V. Nucleation models can also be tested from crystallization in supersaturated solutions.…”

“…When we deal with electrocrystallization, as lnβ=zFη/RT, where η is the overpotential, we can write [1,16,23,27]:…”

“…Theories of nucleation have been developed along the last century, from both thermodynamic and kinetic points of view [1,[9][10][11][12][13][14]. The phenomenon of electrocrystallization has been treated by several authors [15][16][17][18][19][20][21] and reviewed recently [22][23]. Experimental analysis of nucleation models presents several problems, joined to the control of the system where nucleation occurs or to the nucleation detection technique.…”