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ALKALINE EARTH METAL TITANATE CRYSTAL LAMINATE meetings

Foreign code F190009821
File No. J1023-03WO
Posted date May 9, 2019
Country WIPO
International application number 2018JP034156
International publication number WO 2019054474
Date of international filing Sep 14, 2018
Date of international publication Mar 21, 2019
Priority data
  • P2017-177321 (Sep 15, 2017) JP
Title ALKALINE EARTH METAL TITANATE CRYSTAL LAMINATE meetings
Abstract Provided are a new type of crystal laminate of an alkaline earth metal titanate having improved catalytic activity, and a method for the production thereof. This crystal laminate comprises alkaline earth metal titanate crystals as constituent units and is characterised in that the crystals serving as constituent units are cubic, tetragonal or orthorhombic, have a primary particle size of no more than 500nm, and are layered with an orientation in the direction of the {100} planes of said crystals.
Outline of related art and contending technology BACKGROUND ART
Strontium titanate, barium titanate or the like of the alkaline earth metal titanate, have high catalyst activity and the dielectric properties of the light, light for water decomposition, ceramic capacitor, piezoelectric element and the like are used. However, the nanoparticles of the metals titanium, randomly tends to agglomerate, which is caused by the drop in surface area that, due to the mismatching of the interface, light catalytic activity, the light energy conversion efficiency is a problem.
As a means for solving this problem, with respect to the metal oxide nanoparticles, metal oxide nanoparticles with the super structure of the self-assembled metal oxide crystals reported means meso (non-patent document 1, 2). Further, the inventors of the present invention, typified by titanium oxide of the metal oxide easily to obtain a crystalline material that has been found that, the metal oxide precursor, ammonia and water, or a metal oxide precursor, ammonia, an aqueous solution containing a surfactant and water by baking, the metal oxides larger in size and specific surface area of the obtained crystal was found to be mesoporous (Patent Document 1, 2). 2 The composite oxide containing one or more metal species can be obtained crystals of mesoporosity (Patent Document 2) has been found.
Scope of claims (In Japanese)請求の範囲 [請求項1]
 チタン酸アルカリ土類金属の結晶を構成単位とする結晶積層体であって、
 前記構成単位となる結晶が立方晶、正方晶又は直方晶であり、
 前記構成単位となる結晶の1次粒子径が500nm以下であり、
 かつ前記結晶が、その{100}面方向に配向して積層されている
ことを特徴とする結晶積層体。

[請求項2]
 前記結晶積層体の平均幅が、1μm以上である、請求項1に記載の結晶積層体。

[請求項3]
 前記結晶積層体の平均厚みが、50nm以上である、請求項1又は2に記載の結晶積層体。

[請求項4]
 前記結晶積層体表面に存在する結晶の1次粒子径が、前記結晶積層体内部に存在する結晶の1次粒子径よりも大きいことを特徴とする、請求項1~3のいずれか1項に記載の結晶積層体。

[請求項5]
 前記結晶積層体の比表面積が10m 2/g以上である、請求項1~4のいずれか1項に記載の結晶積層体。

[請求項6]
 請求項1~5のいずれか1項に記載の結晶積層体の表面上に、チタン酸アルカリ土類金属結晶ナノ粒子を有する構造体であって、
 前記ナノ粒子の結晶配向が、前記結晶積層体と同一方向に配向していることを特徴とする構造体。

[請求項7]
 前記ナノ粒子の1次粒子径が、前記結晶積層体表面に存在する結晶の1次粒子径の2倍以上である、請求項6に記載の構造体。

[請求項8]
 前記ナノ粒子の1次粒子径が、50nm以上である、請求項6又は7に記載の構造体。

[請求項9]
 チタン酸アルカリ土類金属の結晶積層体の製造方法であって、
 酸化チタンナノ粒子が規則的に積層された酸化チタンメソ結晶と、アルカリ土類金属原子源とを水熱反応に供することを特徴とする、結晶積層体の製造方法。

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • Inventor
  • TACHIKAWA, Takashi
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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