Title In-situ monitoring of silica shell growth on PS-b-P4VP micelles as templates using DLS
Date 19.12.2016
Number 51122
Abstract Polystyrene-block-poly(4-vinylpyrdine) (PS-b-P4VP) block copolymer (BCP) was used as a template for the preparation of PS-b-P4VP@SiO2 core-shell particles using an acid catalyzed sol-gel process. The process of silica shell formation and development of shell morphology were studied using a combination of in-situ dynamic light scattering (DLS) and transmission electron microscopy (TEM). The results obtained reveal that shell formation and growth principally involve the following stages: (I) sol assembly around BCP micelles; (II) hydrolysis-condensation reaction accelerated by the protonated P4VP corona of BCP micelles; (III) shell densification; and (IV) shell growth. Present work provides insight into the sol-gel process which takes place in systems containing “reactive” templates, such as protonated PS-b-P4VP micelles, and discloses the mechanism and pathways of silica shell formation. We demonstrate that the whole process can be effectively monitored in-situ using conventional DLS. The results are of significant importance for fabrication of targeted core-shell nanostructures.
Publisher Polymer
Identifier 0
Citation Polymer 107 (2016) 485-491
Authors Horechyy, A. ; Nandan, B. ; Shajkumar, A. ; Formanek, P. ; Paturej, J. ; Stamm, M. ; Fery, A.
Tags in-situ dls sol-gel core-shell particles block copolymer micelles ps-b-p4vp

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