Authors: Spange, Stefan¹; Reuter, Anett¹; Prause, Silvio¹; Bellmann, Cornelia²

Source: Journal of Adhesion Science and Technology, Volume 14, Number 3, 2000 , pp. 399-414(16)

Publisher: VSP, an imprint of Brill

Abstract:

Zeta potential plots, Kamlet-Taft's α (hydrogen bond-donating, HBD), β (hydrogen bond-accepting, HBA), and π* (dipolarity/polarizability) parameters as well as Gutmann's DN (donor numbers) are presented for 12 differently functionalized (i.e. alkyl, cyanoalkyl, aminoalkyl, and imidazolidine) silica particles. The pH-dependent zeta potential plots were measured in aqueous solution, whereas the solvatochromic studies were performed in 1,2-dichloroethane and cyclohexane as solvents using a special UV/visible spectroscopic technique. For the determination of the solvatochromic polarity parameters, a set of carefully characterized polarity indicators was employed: Cu(tmen)(acac)⁺B(C₆H₅)₄^- for β and DN; dicyano-bis(1,10-phenanthroline)iron(II) for α; 4,4′-bis(N,N-dimethylamino)benzophenone for π*; and an aminobenzofuranone derivative {3-(4-amino-3-methylphenyl)-7-phenyl-benzo[1,2b : 4,5b′]difuran-2,6-dione} (ABF) for α, β, and π*. The calculation of the polarity parameters was carried out via linear solvation energy (LSE) correlation equations using the Kamlet-Taft solvent parameters as a reference system. A linear correlation between the electrokinetically determined value of the isoelectric point and the β parameter of the functionalized silicas is demonstrated.

Keywords: SURFACE POLARITY; ELECTROKINETICS; SOLVATOCHROMISM; SURFACE MODIFICATION

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856100742672

Affiliations: 1: Department of Polymer Chemistry, Institute of Chemistry, Chemnitz University of Technology, Strasse der Nationen 62, D-09107 Chemnitz, Germany 2: Institute of Polymer Research, Hohe Strasse 6, D-01069 Dresden, Germany

Publication date: 2000-01-12

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