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Forces measured between zirconia surfaces in poly(acrylic acid) solutions
YKI – Ytkemiska institutet.
1999 (engelsk)Inngår i: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 82, s. 1137-1145Artikkel i tidsskrift (Fagfellevurdert)
Abstract [en]

We have studied the forces between a sphere and a plane surface of yttria-partially-stabilized tetragonal-zirconia immersed in aqueous solutions of low-molecular-weight (Mw = 10 000) poly(acrylic acid) (PAA) using atomic force microscopy. The measurements are performed at high pH where the adsorbed, highly charged anionic polyelectrolyte extends far into the solution, resulting in a combination of polymeric (steric) and electrostatic interactions. Analysis of the experimental data using scaling theory shows that the polymeric contribution dominates and that the electrostatic contribution is small at relatively high ionic strength (0.01M NaCI). We find that the measured forces are highly dependent on time and interaction history of the absorbed PAA layer; consecutive compression-decompression cycles result in an increase of the surface coverage and the range of the repulsive polymeric interaction. This buildup of PAA at the inter-face is strongly related to attractive bridging interactions manifested as strong adhesion during decompression at less than full surface coverage. The force results are compared to rheological observations of zirconia suspensions stabilized by the same dispersant; the poor colloidal sta-bility and high viscosity at low surface coverage of PAA are related to the attractive bridging interactions.

sted, utgiver, år, opplag, sider
1999. Vol. 82, s. 1137-1145
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Identifikatorer
URN: urn:nbn:se:ri:diva-26619OAI: oai:DiVA.org:ri-26619DiVA, id: diva2:1053622
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A1206Tilgjengelig fra: 2016-12-08 Laget: 2016-12-08 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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