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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1021/la202974b
|2 doi
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|a pubmed24n0709.xml
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|a eng
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1 |
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|a Dragosavac, Marijana M
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Production of porous silica microparticles by membrane emulsification
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|c 2012
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 25.04.2012
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|a Date Revised 10.01.2012
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a A method for the production of near-monodispersed spherical silica particles with controllable porosity based on the formation of uniform emulsion droplets using membrane emulsification is described. A hydrophobic metal membrane with a 15 μm pore size and 200 μm pore spacing was used to produce near-monodispersed droplets, with a mean size that could be controlled between 65 and 240 μm containing acidified sodium silicate solution (with 4 and 6 wt % SiO(2)) in kerosene. After drying and shrinking, the final silica particles had a mean size in the range between 30 and 70 μm. The coefficient of variation for both the droplets and the particles did not exceed 35%. The most uniform particles had a mean diameter of 40 μm and coefficient of variation of 17%. By altering the pH of the sodium silicate solution and aging the gel particles in water or acetone, the internal structure of the silica particles was successfully modified, and both micro- and mesoporous near-monodispersed spherical particles were produced with an average internal pore size between 1 and 6 nm and an average surface area between 360 and 750 m(2) g(-1). A material balance and particle size analysis provided identical values for the internal voidage of the particles, when compared to the voidage as determined by BET analysis
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|a Journal Article
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1 |
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|a Vladisavljević, Goran T
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Holdich, Richard G
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Stillwell, Michael T
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 28(2012), 1 vom: 10. Jan., Seite 134-43
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|x 1520-5827
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| 773 |
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|g volume:28
|g year:2012
|g number:1
|g day:10
|g month:01
|g pages:134-43
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|u http://dx.doi.org/10.1021/la202974b
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