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

外加振动场和外加电压影响了SiO_2-TiO_2凝胶涂层在热水处理过程中形成的二氧化钛晶粒的纳米结构。在没有外场的情况下，在热水处理期间在涂层上形成尺寸为30-50 nm的颗粒状纳米晶，而在热水处理期间通过向基底施加振动，沉淀物的形状变成片状。也观察到涂层上沉淀物形状的类似变化，并且通过在基板之间施加电场在负电极处形成枝状（树枝状）微晶。片状和枝状微晶主要由水合二氧化钛m（TiO_2）·nH_2O组成，具有片状层状结构，d间距为0.6-0.8 nm。二氧化钛纳米片的特征在于大的表面积与体积比，这产生了优异的水润湿性和防雾性能。加工温度 ...更多信息 在大气压下，可将制备温度降低到60℃左右，从而使该涂层在包括耐热性差的有机聚合物在内的各种基底上具有很大的应用潜力。SiO_2-TiO_2凝胶膜中的F_（127）使热处理后的SiO_2-TiO_2凝胶膜形成多孔膜结构，并使SiO_2-TiO_2纳米晶在整个膜中高度分散。水处理采用溶胶-凝胶法制备了粒径约0.7 μm的SiO_2-TiO_2球形微粒。经90℃的热水处理后，微粒中形成了锐钛矿型纳米晶，比表面积增加。用纳米SiO_2-TiO_2微粒在ITO玻璃衬底上沉积了颗粒状的厚膜，热水处理也能在低温下形成纳米晶和纳米结构的Al_2O_3、SnO_2和ZnO凝胶膜。热水处理使SnO_2和ZnO晶体析出，而在Al_2O_3膜上生成AlO（OH）晶体。对于ZnO凝胶涂层，电压和基底类型对负极上ZnO的结晶习性有显着影响。ITO涂层玻璃衬底和硅片分别形成了沿C轴方向取向的半球形柱状晶和花瓣状微晶。少

项目成果

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

(100-x)SiO_2 xTiO_2 通过溶胶-凝胶法和沸腾热水处理获得薄膜的锐钛矿纳米晶体沉淀涂层的表征

• 发表时间: 2005
• 期刊: Journal of Materials Research 20[1]
• 作者: 松田厚範;辰巳砂昌弘;松田厚範;A.Matsuda et al.
• 通讯作者: A.Matsuda et al.

「有機・無機ナノ複合材料の新局面」B編 ゾル-ゲル法による有機・無機ナノハイブリッドの創製

“有机-无机纳米复合材料的新方面”B部分：溶胶-凝胶法制备有机-无机纳米杂化物

• 发表时间: 2004
• 作者: A.Matsuda;M.Tatsumisago (分担);松田厚範 (分担);松田厚範(分担)
• 通讯作者: 松田厚範(分担)

External-Field Hot-Water Treatments of Sol-Gel Derived SiO2-TiO2 Coatings for Surface Nanostructure Control —A Review—

• DOI: 10.2109/jcersj.114.26
• 发表时间: 2006
• 期刊: Journal of the Ceramic Society of Japan
• 影响因子: 1.1
• 作者: A. Matsuda;M. Sakai;T. Kogure;K. Tadanaga;M. Tatsumisago

Characterization of Ramiform Precipitates Formed on SiO_2-TiO_2 Gel Coatings by Electric Field Hot Water Treatment

电场热水处理SiO_2-TiO_2凝胶涂层上枝状沉淀的表征

• 期刊: Journal of Non-Crystalline Solids (submitted)
• 作者: A.Matsuda;K.Kobayashi;T.Kogure;M.Sakai;K.Tadanaga;T.Minami;M.Tatsumisago
• 通讯作者: M.Tatsumisago

Titania Nanocrystals-Despersed Coatings fromSiO_2-TiO_2 Gel Films through Hydrolysis and Dissolution

SiO_2-TiO_2凝胶膜水解溶解二氧化钛纳米晶分散涂层

• 期刊: Key Engineering Materials 印刷中
• 作者: A.Matsuda;Y.Higashi;K.Tadanga;M.Tatsunisago;A.Matsuda et al.;A.Matsuda et al.
• 通讯作者: A.Matsuda et al.