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Shajkumar, Aruni,Nandan, Bhanu,Sanwaria, Sunita,Albrecht, Victoria,Libera, Marcin,Lee, Myong-Hoon,Auffermann, Gudrun,Stamm, Manfred,Horechyy, Andriy Academic Press 2017 Journal of Colloid and Interface Science Vol. No.
<P><B>Abstract</B></P> <P>Catalytically active Au@hollow-SiO<SUB>2</SUB> particles embedded in porous silica support (Au@hollow-SiO<SUB>2</SUB>@PSS) were prepared by using spherical micelles from poly(styrene)-<I>block</I>-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-SiO<SUB>2</SUB> particles in porous silica support prevented their fusion during pyrolysis. The catalytic activity of Au@hollow-SiO<SUB>2</SUB>@PSS was investigated using a model reaction of catalytic reduction of 4-nitrophenol and reductive degradation of Congo red azo-dye. Significantly, to the best of our knowledge, Au@hollow-SiO<SUB>2</SUB>@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-SiO<SUB>2</SUB> particles and easy accessibility of reagents to the catalytically active sites of the ligand-free gold surface through the porous silica support.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>