申请人:Isobe Tetsuhiko
公开号:US20060234417A1
公开(公告)日:2006-10-19
There is provided composite nano-particles comprising nano-crystal particles dispersed stably and individually in suspension in high concentration without mutual aggregation of the nano-particles. A determined amount of pure water or deionized water is poured into a reactor, into which is introduced nitrogen gas at rate of 300 cm
3
/min for a given time while agitating with a stirrer to remove dissolved oxygen in the pure water, allowing to stand in an atmosphere of nitrogen. Next, the inside of the reactor is maintained in an atmosphere of nitrogen and sodium citrate as a dispersion-stabilizing agent, an aqueous solution of MPS as a surface-modifying agent, an anion aqueous solution for co-precipitation as a nano-crystal and a cation aqueous solution are added, in that order. Then, an aqueous solution of sodium silicate is added to the reactor, which is then allowed to stand in the dark place in an atmosphere of nitrogen after agitation. At that time, a vitrification-inhibiting agent may be added in order to inhibit the growth of glass layer.
本发明提供了一种复合纳米颗粒,它由纳米晶体颗粒组成,这些颗粒在高浓度悬浮液 中稳定地单独分散,不会相互聚集。将一定量的纯水或去离子水倒入反应器中,然后以 300 cm3 的速度向反应器中通入氮气。
3
/min的速度将氮气引入反应器,同时用搅拌器搅拌,以去除纯水中的溶解氧,并在氮气环境中静置一段时间。然后,将反应器内部保持在氮气环境中,依次加入分散稳定剂柠檬酸钠、表面改性剂 MPS 水溶液、纳米晶体共沉淀用阴离子水溶液和阳离子水溶液。然后,向反应器中加入硅酸钠水溶液,搅拌后将反应器置于氮气环境中的暗处。此时,可加入玻璃化抑制剂,以抑制玻璃层的生长。