Authors
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Spange, St. ; Reuter, A. ; Prause, S. ; Bellmann, C.
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Title
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Electrokinetic and Solvatochromic Studies of Functionalized Silica Particles
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Date
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27.01.2000
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Number
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6338
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Abstract
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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 <I>DN</I> (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)<SUP>+</SUP>B(C<SUB>6</SUB>H<SUB>5</SUB>)<SUB>4</SUB><SUP>-</SUP> for β and <I>DN</I>; 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.
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Publisher
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Journal of Adhesion Science and Technology
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Wikidata
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Citation
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Journal of Adhesion Science and Technology 14 (2000) 399-414
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DOI
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https://doi.org/10.1163/156856100742672
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Tags
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