1 Ocak 2013 Dergi makalesi Açık Erişim

Malay, Ozge; Yilgor, Iskender; Menceloglu, Yusuf Z.

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    "creators": [
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        "affiliation": "Sabanci Univ, Fac Engn & Nat Sci, Adv Composites & Polymer Proc Lab, TR-34956 Istanbul, Turkey", 
        "name": "Malay, Ozge"
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      {
        "affiliation": "Koc Univ, KUYTAM, Surface Sci & Technol Ctr, Dept Chem, TR-34450 Istanbul, Turkey", 
        "name": "Yilgor, Iskender"
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      {
        "affiliation": "Sabanci Univ, Fac Engn & Nat Sci, Adv Composites & Polymer Proc Lab, TR-34956 Istanbul, Turkey", 
        "name": "Menceloglu, Yusuf Z."
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    "description": "In-situ liquid-state Si-29 nuclear magnetic resonance was used to investigate the temporal concentration changes during ammonia-catalyzed initial hydrolysis of tetraethyl orthosilicate in different solvents (methanol, ethanol, n-propanol, iso-propanol and n-butanol). Dynamic light scattering was employed to monitor simultaneous changes in the average diameter of silica particles and atomic force microscopy was used to image the particles within this time frame. Solvent effects on initial hydrolysis kinetics, size and polydispersity of silica particles were discussed in terms of polarity and hydrogen-bonding characteristics of the solvents. Initial hydrolysis rate and average particle size increased with molecular weight of the primary alcohols. In comparison, lower hydrolysis rate and larger particle size were obtained in the secondary alcohol. Exceptionally, reactions in methanol exhibited the highest hydrolysis rate and the smallest particle size. Ultimately, our investigation elaborated, and hence confirmed, the influences of chemical structure and nature of the solvent on the formation and growth of the silica particles under applied conditions.", 
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      "issue": "2", 
      "pages": "351-361", 
      "title": "JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY", 
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    "title": "Effects of solvent on TEOS hydrolysis kinetics and silica particle size under basic conditions"
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