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Influence of chemical pretreatment on the surface properties of silicon nitride powder
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1999 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 158, 327-341 p.Article in journal (Refereed)
Abstract [en]

Adsorption energy distributions for nitrogen at the surface of silicon nitride samples with different pretreatment have been obtained and related to the heats of adsorption determined by BET analysis of adsorption isotherms. This has confirmed the conjecture that, in normal conditions, the surface of silicon nitride is covered by a layer of silica, as suggested by earlier studies. An attempt to correlate adsorption data with ab initio potentials of the adsorbate-adsorbent interaction has been made. The charge-regulated behaviour of the surface of silicon nitride in aqueous electrolytic solutions has been investigated in relation to charge titration and electrokinetic experiments. An important role of surface hydrolysis in the interpretation of experimental data has been pointed out. Based on the surface ionization parameters extracted from charge titration data, interparticle forces governing the stability of colloidal dispersions have been calculated in the framework of Derjaguin's approximation.

Place, publisher, year, edition, pages
1999. Vol. 158, 327-341 p.
Keyword [en]
Ab initio, Adsorbate-adsorbent interaction, Adsorption energy distribution, Charge regulation, colloid stability, interparticle interaction, silicon nitride, surface heterogeneity.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26449OAI: oai:DiVA.org:ri-26449DiVA: diva2:1053451
Note
A1227Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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