公开(公告)号：JP2002265223A

公开(公告)日：2002-09-18

申请号：JP2001068076

申请日：2001-03-12

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SASAKI TAKAYOSHI ,  EBINA YASUO ,  HARADA MASARU ,  SUZUKI JUN ,  WATANABE JUN

IPC: B82B1/00 ,  B82B3/00 ,  C01G23/04

Abstract: PROBLEM TO BE SOLVED: To solve such a problem that an ultrathin film made by laminating titania nanosheets and a polymer which is developed by this inventor previously is short of thermal stability, chemical stability and mechanical strength and has a fear of hindering a practical use depending on an application because the polymer is laminated within the thin film due to its role of a binder for the nanosheets, although the ultrathin film has an excellent characteristic such as highly efficient absorption for ultraviolet light. SOLUTION: The titania ultrathin film comprises a multi-layered structure of titania nanosheets consisting of ultrathin particles which are obtained by exfoliating laminar titanium oxide microcrystals and has no polymer interposing layer. By alternately laminating titania nanosheets consisting of ultrathin particles which are obtained by exfoliating laminar titanium oxide microcrystals and a cationic polymer on a substrate from liquid phases, respectively, the multi-layered structure film which is made by the titania ultrathin film and the polymer of interposed layer is once manufactured, but the polymer is removed from the film of the multi-layered structure film by heat treatment or electromagnetic irradiation such as ultraviolet rays and, thereby, the titania ultrathin film is produced.

公开(公告)号：JP2003160335A

公开(公告)日：2003-06-03

申请号：JP2001357178

申请日：2001-11-22

Applicant: NAT INST FOR MATERIALS SCIENCE ,  KAKEN KK

Inventor： AWAZU MASASHI ,  MORI TOSHIYUKI ,  FUJIMOTO KENJIRO ,  WATANABE JUN ,  SUZUKI JUN ,  HARADA MASARU ,  HASEGAWA YOSHIO

IPC: C01B13/32 ,  C01G1/00 ,  C01G19/00 ,  C01G23/00

Abstract: PROBLEM TO BE SOLVED: To obtain a hollandite type compound powder having a high specific area and excellent homogeneity in composition. SOLUTION: Various metal alkoxides are used as starting materials so as to satisfy, in composition, the chemical formula: A x M y N 8-y O 16 (wherein, A is K, Na, Rb or Ca; M is Fe, Ga, Zn, In, Cr, Co, Mg, Al or Ni; N is Sn or Ti; 1.5≤x≤2.0; and 1.5≤y≤2.0). The hollandite type compound powder is produced by dissolving the above starting materials into an organic solvent, mixing to prepare a precursor solution, and hydrolyzing the obtained mixed solution under such conditions that a hydrolytic rate is 0.15%/min or higher but 3.0%/min or lower, the dropping rate of hydrolysis water is regulated to 0.1-2.0 ml/min, the final hydrolysis rate of the whole raw material is 95% or more, that is, the non-hydrolyzed materials are regulated to 5% or less, and the temperature of the alkoxide mixed solution at hydrolysis is 4°C or higher but 20°C or lower. COPYRIGHT: (C)2003,JPO