Synthesis of transparent aqueous sols of colloidal layered niobate nanocrystals at room temperature

Bottom-up synthesis of titanophosphate nanosheets by the aqueous solution process

“…Alternatively, we have formed metalate nanosheets by a bottom-up synthesis in aqueous solution. [12][13][14][15][16][17][18] The chemical reactions in the sols form layered metalates with bulky cations in their interlayers. These layered metalates are exfoliated, yielding metalate nanosheets as highly water-dispersible colloidal particles, which can be applied as coating sols for thin lm fabrication by solution processes.…”

“…These layered metalates are exfoliated, yielding metalate nanosheets as highly water-dispersible colloidal particles, which can be applied as coating sols for thin lm fabrication by solution processes. 13,19 In our previous work, many types of metalate nanosheets were synthesized in strongly basic aqueous sols, which can corrode the substrates. To avoid this problem, bottom-up synthesis of metalate nanosheets in acidic or neutral aqueous sols is desirable.…”

Synthesis of Stable Sols of Layered Titanate Nanoparticles using Dialysis and Applications for Thin Film Preparation

“…This process requires that the titanium hydroxide gels are purified by washing using a centrifuge. Ban et al synthesized a colloidal solution of layered titanate by mixing titanium isopropoxide and tetramethylammonium hydroxide aqueous solution at room temperature [13,14]. These sols are useful for anatase nanoparticles and for hybrid inorganic-organic films.…”

Synthesis of layered tantalate nanocrystals by aqueous process at room temperature

“…Previously, we reported a novel synthesis method for layered titanate 14,15 and niobate 16 nanocrystals. An aqueous solution of the tetraalkylammonium hydroxide was mixed with Ti[OCH(CH 3 ) 2 ] 4 or Nb(OC 2 H 5 ) 5 under ambient conditions.…”

“…The titanate nanocrystals had a lepidocrocite-type layered crystal structure 17 while the niobate nanocrystals were similar in structure to layered hexaniobates, M 4 Nb 6 O 17 ?nH 2 O. 16 Moreover, different nanostructures of anatase-type titanium oxide were formed by the hydrothermal treatment of the aqueous colloidal suspensions of titanate nanocrystals. [17][18][19][20][21][22] Therefore, the application of this novel synthesis method to layered compounds other than titanate and niobate is intriguing.…”