Characterization of an Amphoteric-Charged Layer Grafted to the Pore Surface of a Porous Membrane

Autor:	Akihiko Tanioka, Norihiko Minoura, Toshihiko Jimbo
Rok vydání:	1998
Předmět:	Aqueous solution Chemistry Protonation Surfaces and Interfaces Electrolyte Condensed Matter Physics Streaming current Dissociation (chemistry) Isoelectric point Chemical engineering Polymerization Polymer chemistry Electrochemistry General Materials Science Surface charge Spectroscopy
Zdroj:	Langmuir. 14:7112-7118
ISSN:	1520-5827 0743-7463
DOI:	10.1021/la9800295
Popis:	Porous membranes having amphoteric charge groups were prepared by heterogeneous graft polymerization from aqueous solution containing acrylic acid and (N,N-dimethylamino)propyl acrylamide. The charging properties of the amphoteric charge groups grafted to the pore surface were investigated by ζ potentials obtained from streaming potential measurements. Theoretical development in terms of the amphoteric pore surface was attempted by introducing a site dissociation model of pH-dependent ζ potentials. The theoretical model is based on the assumption that the surface charge arises only from the protonation and deprotonation of the charged surface groups exposed to electrolyte solution. Good fits between experimental results and theoretical equations were attained, and thereby the isoelectric point, dissociation constant, apparent surface site density, and acid-to-base ratio of the amphoteric pore surface were determined. Depending on the variation in the feed monomer ratio for graft polymerization, these para...
Databáze:	OpenAIRE
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