Synthesis and Characterization of Core/Shell Structured Silica Composite Microspheres with Dendritic Mesoporous Silica Shells

doi:10.11901/1005.3093.2017.746

Chinese Journal of Materials Research

2018, Vol. 32

Issue (10): 791-800 DOI: 10.11901/1005.3093.2017.746

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Synthesis and Characterization of Core/Shell Structured Silica Composite Microspheres with Dendritic Mesoporous Silica Shells

Changzhi ZUO¹, Yang CHEN¹(

), Ailian CHEN²

1 School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
2 School of Mechanical Engineering, Changzhou University, Changzhou 213164, China

Cite this article:

Changzhi ZUO, Yang CHEN, Ailian CHEN. Synthesis and Characterization of Core/Shell Structured Silica Composite Microspheres with Dendritic Mesoporous Silica Shells. Chinese Journal of Materials Research, 2018, 32(10): 791-800.

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Abstract

Core/shell structured composite microspheres of sSiO₂/D-mSiO₂composed of solid silica (sSiO₂) as core and dendritic mesoporous silica (D-mSiO₂) as shell were synthesized via an oil-water biphase stratification approach with cetyltrimethylammonium bromide (CTAB) as template, tetraethylorthosilicate (TEOS) as precursor, Triethanolamine (TEA) as catalyst and n-hexane as emulsion agent. The synthesized products were characterized by means of field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffractometer (XRD), and nitrogen adsorption/desorption measurements. As revealed by FESEM and TEM that there existed plenty of radiate-dendritic-like open meso-channels, which were perpendicular to the sSiO₂sphere surface.The thicknesses of D-mSiO₂ shell could be controlled by adjusting the TEOS amount. Low-angle XRD analyses suggested that the mesochannles in the shells exhibit poor degree of order, and the average pore diameter was 7~9 nm. Moreover, the D-mSiO₂ shell thicknesses (5~60 nm) increased firstly and then decreased with the increase of stirring rate (50~500 r/min). Finally, the formation mechanism for the mesoporous shells with radiate-dendritic-like open meso-channels of composite microspheres was also discussed.

Key words: inorganic non-metallic materials mesoporous silica dendritic mesoporous channels core/shell structure composite microspheres

Received: 18 December 2017

ZTFLH:

TB332

Fund: Supported by National Natural Science Foundation of China (Nos. 51405038, 51575058 & 51875052)

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	Changzhi ZUO
	Yang CHEN
	Ailian CHEN

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.746 OR https://www.cjmr.org/EN/Y2018/V32/I10/791

Fig.1 FTIR spectra of sSiO₂/D-mSiO₂ composite samples

Fig.2 FESEM images of (a, b) sSiO₂, (c, d) sSiO₂/D-mSiO₂-1, (e, f) sSiO₂/D-mSiO₂-2, and (g, h) sSiO₂/D-mSiO₂-3 samples

Fig.3 TEM images of sSiO₂ (a) ,sSiO₂/D-mSiO₂-1 (b), sSiO₂/D-mSiO₂-2 (c) and sSiO₂/D-mSiO₂-3 (d) samples

Fig.4 TEM images of sSiO₂/D-mSiO₂ composites: (a) 50, (b) 100, (c) 300, and (d) 500 r/min

Fig.5 XRD patterns of sSiO₂/D-mSiO₂ composite samples

Fig.6 Nitrogen adsorption/desorption isotherms and pore size distribution curves of (a, b) sSiO₂/D-mSiO₂-1, (c, d) sSiO₂/D-mSiO₂-2, and (e, f) sSiO₂/D-mSiO₂-3 samples

Table 1 Pore structure parameters of sSiO₂/D-mSiO₂ samples

Fig.7 Schematic diagrams of fabrication procedure for the sSiO₂/D-mSiO₂ composites

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