✦ LIBER ✦

Adsorption of Polyethylenimine on Nanosized Zirconia Particles in Aqueous Suspensions

✍ Scribed by J Wang; L Gao

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 62 KB
Volume: 216
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1999.6308

No coin nor oath required. For personal study only.

✦ Synopsis

Polyethylenimine (PEI, M w 50,000) was employed as a dispersant to stabilize nanosized ZrO 2 (3 mol% Y 2 O 3 doped) aqueous suspensions. Adsorption isotherm measurements demonstrated that the plateau region of coverage was reached when polymer concentration approached 1.0 wt% dry weight basis of ZrO 2 and beyond at fixed pH values. The positively charged polymer chains showed a high affinity type of adsorption on nanosized ZrO 2 particles. Obviously, the amount of dispersant adsorbed on ZrO 2 particles at pH higher than the isoelectric point was greater than the amount adsorbed at low pH. FTIR spectral analysis of the polymer-anchored ZrO 2 nanoparticles strongly supported the conclusion that the adsorption was accompanied by the formation of a ZrO 2 /PEI interface complex. The mechanisms of PEI adsorption on ZrO 2 nanoparticles were dominated by hydrogen bonding and electrostatic attraction.

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