Production of Porous Silica Microparticles by Membrane Emulsification
Апстракт
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 mu m pore size and 200 mu m pore spacing was used to produce near-monodispersed droplets, with a mean size that could be controlled between 65 and 240 mu m 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 mu m. 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 mu m 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 sph...erical 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.
Извор:
Langmuir, 2012, 28, 1, 134-143Финансирање / пројекти:
- UK Engineering and Physical Sciences Research Council
DOI: 10.1021/la202974b
ISSN: 0743-7463
PubMed: 22059928
WoS: 000298904900022
Scopus: 2-s2.0-84855647339
Колекције
Институција/група
VinčaTY - JOUR AU - Dragosavac, Marijana M. AU - Vladisavljević, Goran T. AU - Holdich, Richard G. AU - Stillwell, Michael T. PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4644 AB - 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 mu m pore size and 200 mu m pore spacing was used to produce near-monodispersed droplets, with a mean size that could be controlled between 65 and 240 mu m 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 mu m. 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 mu m 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. T2 - Langmuir T1 - Production of Porous Silica Microparticles by Membrane Emulsification VL - 28 IS - 1 SP - 134 EP - 143 DO - 10.1021/la202974b ER -
@article{ author = "Dragosavac, Marijana M. and Vladisavljević, Goran T. and Holdich, Richard G. and Stillwell, Michael T.", year = "2012", abstract = "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 mu m pore size and 200 mu m pore spacing was used to produce near-monodispersed droplets, with a mean size that could be controlled between 65 and 240 mu m 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 mu m. 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 mu m 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.", journal = "Langmuir", title = "Production of Porous Silica Microparticles by Membrane Emulsification", volume = "28", number = "1", pages = "134-143", doi = "10.1021/la202974b" }
Dragosavac, M. M., Vladisavljević, G. T., Holdich, R. G.,& Stillwell, M. T.. (2012). Production of Porous Silica Microparticles by Membrane Emulsification. in Langmuir, 28(1), 134-143. https://doi.org/10.1021/la202974b
Dragosavac MM, Vladisavljević GT, Holdich RG, Stillwell MT. Production of Porous Silica Microparticles by Membrane Emulsification. in Langmuir. 2012;28(1):134-143. doi:10.1021/la202974b .
Dragosavac, Marijana M., Vladisavljević, Goran T., Holdich, Richard G., Stillwell, Michael T., "Production of Porous Silica Microparticles by Membrane Emulsification" in Langmuir, 28, no. 1 (2012):134-143, https://doi.org/10.1021/la202974b . .