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Authors
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Horechyy, A. ; Nandan, B. ; Shajkumar, A. ; Formanek, P. ; Paturej, J. ; Stamm, M. ; Fery, A.
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Title
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In-situ monitoring of silica shell growth on PS-b-P4VP micelles as templates using DLS
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Date
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19.12.2016
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Number
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51122
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Abstract
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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.
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Publisher
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Polymer
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Wikidata
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Citation
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Polymer 107 (2016) 485-491
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DOI
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https://doi.org/10.1016/j.polymer.2016.07.080
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Tags
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in-situ dls sol-gel core-shell particles block copolymer micelles ps-b-p4vp
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