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  Silica-supported Au@hollow-SiO2 particles with outstanding catalytic activity prepared via block copolymer template approach

Shajkumar, A., Nandan, B., Sanwaria, S., Albrecht, V., Libera, M., Lee, M.-H., et al. (2017). Silica-supported Au@hollow-SiO2 particles with outstanding catalytic activity prepared via block copolymer template approach. Journal of Colloid and Interface Science, 491, 246-254. doi:10.1016/j.jcis.2016.12.051.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-A665-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1E33-5
Genre: Journal Article

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 Creators:
Shajkumar, Aruni1, Author
Nandan, Bhanu1, Author
Sanwaria, Sunita1, Author
Albrecht, Victoria1, Author
Libera, Marcin1, Author
Lee, Myong-Hoon1, Author
Auffermann, Gudrun2, Author              
Stamm, Manfred1, Author
Horechyy, Andriy1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863432              

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 Abstract: Catalytically active Au@hollow-SiO2 particles embedded in porous silica support (Au@hollow-SiO2@PSS) were prepared by using spherical micelles from poly(styrene)-block-poly(4-vinyl pyridine) block copolymer as a sacrificial template. Drastic increase of the shell porosity was observed after pyrolytic removal of polymeric template because the stretched poly(4-vinyl pyridine) chains interpenetrating with silica shell acted as an effective porogen. The embedding of Au@hollow-SiO2 particles in porous silica support prevented their fusion during pyrolysis. The catalytic activity of Au@hollow-SiO2@PSS was investigated using a model reaction of catalytic reduction of 4-nitrophenol and reductive degradation of Congo redazo-dye. Significantly, to the best of our knowledge, Au@hollow-SiO2@PSS catalyst shows the highest activity among analogous systems reported till now in literature. Such high activity was attributed to the presence of multiple pores within silica shell of Au@hollow-SiO2 particles and easy accessibility of reagents to the catalytically active sites of the ligand-free gold surface through the porous silica support. (C) 2016 Elsevier Inc. All rights reserved.

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Language(s): eng - English
 Dates: 2017-01-102017-01-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.jcis.2016.12.051
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Title: Journal of Colloid and Interface Science
  Abbreviation : J. Colloid Interface Sci.
Source Genre: Journal
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Publ. Info: Amsterdam etc. : Elsevier Inc.
Pages: - Volume / Issue: 491 Sequence Number: - Start / End Page: 246 - 254 Identifier: ISSN: 0021-9797
CoNE: /journals/resource/954927606757