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Production of porous silica microparticles by membrane emulsification
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...
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| Format: | Default Article |
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2012
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| Online Access: | https://hdl.handle.net/2134/9368 |
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| _version_ | 1805993575338475520 |
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| author | Marijana Dragosavac Goran Vladisavljevic Richard Holdich Michael T. Stillwell |
| author_facet | Marijana Dragosavac Goran Vladisavljevic Richard Holdich Michael T. Stillwell |
| author_sort | Marijana Dragosavac (1249020) |
| collection | Figshare |
| description | 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 % SiO2) 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 m2 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. |
| format | Default Article |
| id | rr-article-9244919 |
| institution | Loughborough University |
| publishDate | 2012 |
| record_format | Figshare |
| spelling | rr-article-92449192012-01-01T00:00:00Z Production of porous silica microparticles by membrane emulsification Marijana Dragosavac (1249020) Goran Vladisavljevic (1253448) Richard Holdich (1253271) Michael T. Stillwell (7128413) Chemical engineering not elsewhere classified untagged Chemical Engineering not elsewhere classified 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 % SiO2) 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 m2 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. 2012-01-01T00:00:00Z Text Journal contribution 2134/9368 https://figshare.com/articles/journal_contribution/Production_of_porous_silica_microparticles_by_membrane_emulsification/9244919 CC BY-NC-ND 4.0 |
| spellingShingle | Chemical engineering not elsewhere classified untagged Chemical Engineering not elsewhere classified Marijana Dragosavac Goran Vladisavljevic Richard Holdich Michael T. Stillwell Production of porous silica microparticles by membrane emulsification |
| title | Production of porous silica microparticles by membrane emulsification |
| title_full | Production of porous silica microparticles by membrane emulsification |
| title_fullStr | Production of porous silica microparticles by membrane emulsification |
| title_full_unstemmed | Production of porous silica microparticles by membrane emulsification |
| title_short | Production of porous silica microparticles by membrane emulsification |
| title_sort | production of porous silica microparticles by membrane emulsification |
| topic | Chemical engineering not elsewhere classified untagged Chemical Engineering not elsewhere classified |
| url | https://hdl.handle.net/2134/9368 |