Advanced Nanocrystal-Dispersed Coatings from Metal Oxide Gels with Hot-Water Treatment under External Fields

外部场下热水处理的金​​属氧化物凝胶先进纳米晶体分散涂层

• 批准号: 16360327
• 负责人: MATSUDA Atsunori
• 金额: $ 9.6万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360327/
• 关键词: Sol-Gel Method; External Field; Hot-Water Treatment; Nanocrystal; Coating; Titania; Zinc Oxide; Morphology Control

External fields of vibrations and electric voltages affected the nanostructure of titania crystallites formed on SiO_2-TiO_2 gel coatings during hot-water treatment. Without the external fields granular anatase nanocrystals of 30-50 nm in size were formed on the coatings during the hot-water treatment, whereas the shape of the precipitates became sheetlike by applying a vibration to the substrate during hot-water treatment. Similar changes in shape of the precipitates on the coatings were also observed, and ramiform (branchlike) crystallites were formed at the negative electrode by applying an electric field between the substrates. The sheetlike and ramiform crystallites are mainly composed of a hydrated titania, m(TiO_2)・nH_2O, with the lepidocrocite-like layered structure with a d-spacing of 0.6-0.8 nm. Titania nanosheets are characterized by a large surface-to-volume ratio, which gives rise to the excellent wettability for water and antifogging properties. Processing temperatures fo … More r the preparation of the coatings can be lowered at about 60℃ under atmospheric pressure, so that the coatings have a great potential for applications to various substrates including organic polymers with poor heat resistance.The addition of supramolecular assemblies of CTAB, P123, and F127 in the SiO_2-TiO_2 gel films permits the formation porous film structure and highly dispersion of anatase nanocrystals in the whole films after hot-water treatment. When the anatase nanocrystal-dispersed, porous films were irradiated with UV light, residual surfactants were completely eliminated due to the photocatalytic effects of the nanocrystals.SiO_2-TiO_2 spherical microparticles of about 0.7 μm in diameter have been prepared by the sol-gel method. Anatase nanocrystals were formed in the microparticles and their specific surface area was increased after a hot-water treatment at 90℃. Particulate, thick films were electrophoretically deposited on indium-tin oxide (ITO)-coated glass substrates using the anatase nanocrystal-precipitated SiO_2-TiO_2 microparticles.Hot water treatments were also found to be effective to form nanostructure as well as nanocrystals for Al_2O_3, SnO_2 and ZnO gel films at low temperatures. Cubic SnO_2 and hexagonal ZnO crystallites were precipitated by the hot water treatment, whereas AlO(OH) crystallite were formed on the Al_2O_3 film. With respect to ZnO gel coatings, the electric voltage and type of substrates showed a significant influence on the crystal habit of ZnO on the negative electrode. Hexagonal columnar and petal-like crystallites, which were oriented in the C-axis direction, were formed ITO-coated glass substrate and Si wafer, respectively. Less

振动和电压的外部场影响了热水处理过程中SiO_2-TiO_2凝胶涂层上形成的二氧化钛微晶的纳米结构，没有外部场，热水处理过程中涂层上形成了尺寸为30-50 nm的粒状锐钛矿纳米晶体。而在热水处理过程中，通过对基材施加振动，沉淀物的形状会变成片状。还观察到涂层，并且通过在基底之间施加电场在负极处形成枝状（枝状）微晶。片状和枝状微晶主要由水合二氧化钛m(TiO_2)·nH_2O和纤铁矿组成。 d 间距为 0.6-0.8 nm 的类似层状结构的二氧化钛纳米片具有较大的比表面积。使得该涂料具有优异的水润湿性和防雾性能，常压下制备的加工温度可降低至60℃左右，因此该涂料在各种基材上具有巨大的应用潜力。在SiO_2-TiO_2凝胶薄膜中添加CTAB、P123和F127超分子组装体，可以形成多孔薄膜结构，并且具有良好的耐热性。热水处理后锐钛矿纳米晶分散在整个薄膜中当用紫外光照射锐钛矿纳米晶分散的多孔膜时，由于纳米晶的光催化作用，残留的表面活性剂被完全消除。SiO_2-TiO_2球形微粒子的粒径约为1.5μm。通过溶胶-凝胶法制备了直径为0.7μm的材料。使用锐钛矿纳米晶体沉淀的 SiO_2-，在微粒中形成纳米晶体，并在 90℃ 热水处理后，在氧化铟锡 (ITO) 涂层玻璃基板上电泳沉积颗粒厚膜。 TiO_2 微粒。热水处理也被发现可有效形成纳米结构以及纳米晶体，用于热水处理在低温下析出立方体SnO_2和六方体ZnO微晶，而Al_2O_3薄膜上形成AlO(OH)微晶。基板的形状对负极上ZnO的晶习有显着影响。分别在ITO涂覆的玻璃基板和Si晶片上形成沿C轴方向取向的微晶。

项目成果

酸化チタンナノ結晶分散コーティング薄膜の低温合成と高分子および分子集合体の添加によるナノ組織制御(解説)

二氧化钛纳米晶分散涂层薄膜的低温合成及通过添加聚合物和分子聚集体控制纳米结构（解说）

• 发表时间: 2006
• 作者: 片桐清文; 松田厚範; 逆井基次
• 通讯作者: 逆井基次

Characterization of Anatase Nanocrystals-Precipitated Coatings from (100-x)SiO_2・xTiO_2 Gel Films via the Sol-Gel Process with Boiling Hot Water Treatment

通过沸腾热水处理的溶胶-凝胶法表征 (100-x)SiO_2·xTiO_2 凝胶膜锐钛矿纳米晶体沉淀涂层

• 发表时间: 2005
• 作者: A.Matsuda; T.Matoda; T.Kogure; K.Tadanaga; T.Minami; M.Tatsumisago
• 通讯作者: M.Tatsumisago

Effects of Electric Field on the Formation of Titania Nanocrystals on SiO_2-TiO_2 Coatings during Hot Water Treatment

热水处理过程中电场对SiO_2-TiO_2涂层二氧化钛纳米晶形成的影响

• 作者: A.Matsuda et al.

Preparation of Titania Nanosheet-Precipitated Coatings on Glass Substrates by Treating SiO2-TiO2 Gel Films with Hot Water Under Vibrations

振动热水处理 SiO2-TiO2 凝胶膜在玻璃基材上制备二氧化钛纳米片沉淀涂层

• DOI: 10.1023/b:jsst.0000047993.12165.75
• 发表时间: 2004-08-01
• 期刊: Journal of Sol-Gel Science and Technology
• 影响因子: 2.5
• 作者: A. Matsuda;Tatsuo Matoda;T. Kogure;K. Tadanaga;T. Minami;M. Tatsumisago
• 通讯作者: M. Tatsumisago

Synthesis and Stabilization of BaTiO3/CoFe2O4 Ferrocolloids

BaTiO3/CoFe2O4 铁胶体的合成与稳定化

• DOI: 10.4028/www.scientific.net/amr.415-417.362
• 发表时间: 2011-12-01
• 期刊: Advanced Materials Research
• 作者: D. Zhou;Fei;S. Gong;Q. Fu
• 通讯作者: Q. Fu