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12 nm in size were synthesized according to the original method with slight modifications. First, regent grade lysine (0.001 mol, Aldrich, 98%) was dissolved in deionized water with stirring at 333 K. TEOS (0.05 mol, Tokyo Kasei) was added to the lysinewater solution in one step. The molar composition of the reactants was 1TEOS: 0.02lysine: 162H2O.
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Preparation of Anisotropic Silica Nanoparticles via Controlled Assembly of Presynthesized Spherical Seeds
http://pubs.acs.org/doi/abs/10.1021/la103564p
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Synthesis of Spherical Silica Seeds.

In a typical synthesis, Arg (54.6 mg) was dissolved in water (41.4 g) in a 110 ml glass vial at room temperature. TEOS (3.13 g) was added to the Arg-water solution. The reaction was carried out at 60 ¡ãC in a water bath under magnetic stirring for 24 h. The stirring rate was maintained at ca. 500 rpm to obtain TEOS-in-water emulsion system using a 2 cm long Teflon-coated magnetic stirring bar. Spherical silica seeds having an average diameter of 22 nm were synthesized with excellent reproducibility under these reaction conditions.

[ Last edited by znpmg on 2011-1-5 at 22:53 ]
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