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Effect of Catalyst on the Colloidal Silica Particle Growth in Direct Oxidation of Silicon

机译：催化剂对硅直接氧化胶体二氧化硅颗粒生长的影响

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Nano size silica particles were produced by direct oxidation of silicon powder in the water with the base catalysts. The average size of 10～100 nm was successfully prepared from the starting material of silicon powder with variable procession parameters such as silicon solid content, choice of catalyst and amount, the order of mixing, etc. The sodium hydroxide and ammonium hydroxide was chosen for the base catalysts and their amount and addition order were found to control the size of silica particles in the oxidation reaction. The limited amount of NH_4OH as the first catalyst seemed to limit the number of nucleus particles, and the limited amount of NaOH further feeded only for particle growing rather than nucleus formation, thereby it was observed to be able to control the average size of particles to be as large as 100 nm. The possible mechanism of particle growth was suggested by solubility of silica and relative affinity of NH_4~+ and Na~+ ions to the surface of SiO_2.
机译：通过用碱催化剂直接氧化水中的硅粉末制备纳米大小二氧化硅颗粒。从硅粉末的起始材料与可变加工参数如硅固体含量，催化剂的选择和量，混合顺序等成功制备了10〜100nm的平均尺寸。选择氢氧化钠和氢氧化铵。发现碱催化剂及其量和添加顺序在氧化反应中控制二氧化硅颗粒的尺寸。当第一催化剂时的NH_4OH的有限量似乎限制了核颗粒的数量，并且仅用于颗粒生长而不是核形成进一步喂食的NaOH数量，从而观察到能够控制颗粒的平均尺寸大约100纳米。通过二氧化硅的溶解性和NH_4〜+和Na〜+离子的相对亲和力来提出颗粒生长的可能机制，提出了SiO_2的表面。

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