Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 181, Issue -, Pages 254-261Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2013.08.006
Keywords
Olivine; Nano-silica; Specific surface area; Ostwald ripening; Porous material
Categories
Funding
- EU FP7 project Pro Mine: Nanoparticle products from new mineral resources in Europe [228559]
- Bouwdienst Rijkswaterstaat
- Graniet-Import Benelux
- Kijlstra Betonmortel
- Struyk Verwo
- Attero
- Enci
- Provincie Overijssel
- Rijkswaterstaat Directie Zeeland
- AG Maasvlakte
- BTE
- Alvon Bouwsystemen
- V.d. Bosch Beton
- Selor
- Twee R Recycling
- GMB
- Schenk Concrete Consultancy
- Intron
- Geochem Research
- Icopal
- BN International
- APP All Remove
- Consensor
- Eltomation
- Knauf Gips
- Hess ACC Systems
- Kronos
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The production of porous amorphous nano-silica by the olivine route is an interesting alternative to the existing commercial production methods because of the much lower energy requirements of this process. The produced olivine nano-silica has a specific surface area between 100 and 400 m(2)/g and primary particles between 10 and 25 nm (agglomerated in clusters). The process conditions of the dissolution of olivine and the subsequent ripening treatment influence the specific surface area of the nano-silica in the following ways. (1) The cleaner the nano-silica is, the higher the specific surface area is. Thus, high-purity silicas presents an SSA between 300 and 400 m(2)/g. (2) The higher the filtration pressure is, the higher the surface area will be. (3) The ripening treatment can diminish the specific surface of nano-silica by three quarters and reduce the microporous surface area by 90%. A 99% pure nano-silica with specific surface area controlled between 90 and 400 m(2)/g can be synthesized by ripening treatment in an alkaline solution at room temperature. Therefore, tailored olivine nano-silica can provide additional environmental and economic benefits over the current commercial products. (c) 2013 Elsevier Inc. All rights reserved.
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