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標題: Micellization and morphological characterization of Ag-micelles prepared by poly(vinyl acetate)-silver nitrate in solvent/nonsolvent system
作者: Huang, C.J.
Shieu, F.S.
關鍵字: Ag-containing micelle;poly(vinyl acetate);micellization;morphology;solvent/nonsolvent;block-copolymers;nanoparticles
Project: Colloid and Polymer Science
期刊/報告no:: Colloid and Polymer Science, Volume 284, Issue 2, Page(s) 192-202.
The inducing method for preparing Ag-micelle solution with the use of mixed solvent/nonsolvent, and the morphological characterization of the generated metal-micelles were investigated and reported in this paper. In this method, an Ag containing metal chelate polymer (MCP) raw solution was preprepared by dissolving poly(vinyl acetate) (PVAc)-silver nitrate (AgNO3) MCP in cone. formic acid, and a mixed solvent of HCOOH/H2O with specific water composition was then added to induce the micellization of the MCP chain. The critical water concentration (CWC) that was needed for inducing the formation of the Ag-micelles, and the water concentration at which the flocculation of the Ag-micelles occurred in micellar solution, were studied by measuring the transmittance of the dilute MCP solution; the results showed that a long-lasting MCP solution with stable micelles might be prepared by using a H2O/ HCOOH solvent of specific weight ratio 1:1.2. The effect of the AgNO3 concentration on the morphology of the Ag-micelles was also investigated by transmission electron microscopy (TEM). At AgNO3 concentration below 0.5 wt%, the Ag-micelles displayed a variety of core-shell structure; but as the AgNO3 concentration was increased to 1.0-2.0 wt%, micelles that had Ag-solid embedded in the micellar core were observed.
ISSN: 0303-402X
DOI: 10.1007/s00396-005-1360-z
Appears in Collections:工學院

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