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In this work, lysine has been used to catalyze the hydrolysis of tetraethyl orthosilicate in order to fabricate uniform-sized silica nanospheres(SNSs). First, SNSs seeds were synthesized. Then the sphere sizes of silica nanoparticles were expanded by a seed regrowth method. Finally, by evaporating the solvent in the SNSs dispersion, SNSs of different sizes self-assembled into silica colloidal crystals...
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