Hydrothermal synthesis of highly water-dispersible anatase nanocrystals from transparent aqueous sols of titanate colloids
Hydrothermal synthesis of highly water-dispersible anatase nanocrystals from transparent aqueous sols of titanate colloids
复制标题
钛酸盐胶体透明水溶胶水热合成高度水分散性锐钛矿纳米晶
DOI：
10.1007/s11051-010-0027-y
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
and Y. Ohya
中科院分区：
文献类型：
--
作者：
T. Ban;Y. Tanaka;and Y. Ohya
锐钛矿纳米晶的透明胶体水溶液是由水热溶胶与四甲基钛酸铵胶体水热合成的，其表面用柠檬酸改性，通过钛酸盐结构转化为锐钛矿。这种修饰阻碍了水热合成过程中钛酸盐胶体的聚结。尽管在水热处理过程中胶体上吸附的柠檬酸的量减少，但所得锐钛矿纳米晶体上吸附了少量柠檬酸。此外，将使用钛酸盐胶体作为前体与使用柠檬酸钛配合物、柠檬钛酸四甲基铵进行比较。对钛配合物的透明水溶液进行水热处理产生了具有大锐钛矿胶体的不透明溶液，这表明钛酸盐胶体可用于制备透明锐钛矿胶体溶液。因为所得胶体的形状和尺寸可能取决于起始胶体的尺寸和形状，所以使用钛酸盐胶体作为前体可以使得容易控制锐钛矿胶体的尺寸和形状。
Transparent colloidal aqueous solutions of anatase nanocrystals were hydrothermally synthesized from aqueous transparent sols with tetramethylammonium titanate colloids, the surfaces of which were modified with citric acid, by structural conversion of the titanate to anatase. This modification hindered coalescence of the titanate colloids during the hydrothermal synthesis. Although the amount of citric acid adsorbed on the colloids was reduced during hydrothermal treatment, a small amount of citric acid was adsorbed on the resulting anatase nanocrystals. Moreover, the use of the titanate colloids as a precursor was compared with the use of a citrato Ti complex, tetramethylammonium citratotitanate. The hydrothermal treatment of the transparent aqueous solutions of the Ti complex yielded opaque solutions with large anatase colloids, suggesting that the titanate colloids were useful for preparing transparent anatase colloidal solutions. Because the shape and size of resulting colloids may be dependent on the size and shape of starting colloids, the use of titanate colloids as a precursor may make it easy to control size and shape of anatase colloids.