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Investigations of the influence of vapour phase inhibitors on the surface charge of iron oxide particles by zeta‐potential measurements

Identifieur interne : 001288 ( Main/Exploration ); précédent : 001287; suivant : 001289

Investigations of the influence of vapour phase inhibitors on the surface charge of iron oxide particles by zeta‐potential measurements

Auteurs : Künzelmann [Allemagne] ; Jacobasch [Allemagne] ; Reinhard [Allemagne]

Source :

RBID : ISTEX:CCF81908FD782C429A1B4D3BD8E300C0855FA973

Abstract

Adsorbability of the vapour phase inhibitor dicyclohexylammonium nitrite (Dichan) and its ionic constituents present in aqueous media were investigated by means of zeta‐potential measurements in 10−3 M KCl solution in dependence on the pH‐value using particles of various iron oxides and oxide hydroxides. It was pointed out, that the interactions between Dichan and iron oxides result in a negativation of the zeta‐potential and in a displacement of the isoelectric point of the particles surface (IEPS) due to specific adsorption of anions. By dicyclohexylamine in the primary solution, the zeta‐potential of iron oxides is hardly influenced, even when the saturation concentration is established. As nitrite changes the chemical surface properties when concentrations considerably higher than those indicated for Dichan are achieved, a synergism is assumed to be present because of the Dichan's high adsorbability at oxidic iron compounds. This effect probable consist in the promotion of the specific adsorption of nitrite ions at the oxide surface by the amine component.

Url:
DOI: 10.1002/maco.19890401206


Affiliations:


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<div type="abstract" xml:lang="en">Adsorbability of the vapour phase inhibitor dicyclohexylammonium nitrite (Dichan) and its ionic constituents present in aqueous media were investigated by means of zeta‐potential measurements in 10−3 M KCl solution in dependence on the pH‐value using particles of various iron oxides and oxide hydroxides. It was pointed out, that the interactions between Dichan and iron oxides result in a negativation of the zeta‐potential and in a displacement of the isoelectric point of the particles surface (IEPS) due to specific adsorption of anions. By dicyclohexylamine in the primary solution, the zeta‐potential of iron oxides is hardly influenced, even when the saturation concentration is established. As nitrite changes the chemical surface properties when concentrations considerably higher than those indicated for Dichan are achieved, a synergism is assumed to be present because of the Dichan's high adsorbability at oxidic iron compounds. This effect probable consist in the promotion of the specific adsorption of nitrite ions at the oxide surface by the amine component.</div>
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