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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.9b03034
|2 doi
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|a eng
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| 100 |
1 |
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|a Li, Jie
|e verfasserin
|4 aut
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|a Preparation of SilicaSilica Core-Shell Microspheres Using an Aqueous Two-Phase System in a Novel Microchannel Device
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 04.03.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a In the present work, a novel microchannel device was developed and used for the preparation of core-shell microspheres combining with a dextran/poly(ethylene glycol) diacrylate (DEX/PEGDA) aqueous two-phase system. Silicasilica core-shell microspheres were prepared as a model material. Silica@silica core-shell microspheres with different sizes of cores and thicknesses of shells were prepared by using different flowrate ratios of DEX/silica and PEGDA/silica aqueous solutions. The content of colloidal silica and the calcination temperature have a significant effect on the texture properties of the prepared core-shell microspheres. The surface area decreased from 199 to 177 m2/g with an increase in the colloidal silica content from 30 to 60 wt %. For a specific colloidal silica content (50 wt %), with the increase in calcination temperature from room temperature to 650 °C, the total pore volume went through a maximum of 0.7 cm3 g-1 with a surface area of 178 m2 g-1 and pore size of 7.32 nm at 450 °C. Due to the accumulation of metal nanoparticles in DEX, different metal nanoparticles (Ni and Pd) were successfully introduced into the core of the core-shell microspheres for the preparation of silica/metal nanoparticles@silica core-shell microsphere catalysts. The catalysts showed similar catalytic performance as the metal nanoparticles for hydrogenation of 4-nitrophenol with a conversion higher than 95%. However, the core-shell microsphere catalyst is much easier to recover. The reuse experiments indicated that the core-shell catalyst has high stability
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|a Journal Article
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|a Zhang, Feng
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jiang, Leilei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yu, Liang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Lixiong
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 36(2020), 2 vom: 21. Jan., Seite 576-584
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
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|g volume:36
|g year:2020
|g number:2
|g day:21
|g month:01
|g pages:576-584
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|u http://dx.doi.org/10.1021/acs.langmuir.9b03034
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