检索结果-南通市图书馆

Engineering an ultrathin amorphous TiO2 layer for boosting the weatherability of TiO2 pigment with high lightening power

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第11期27卷 2825-2834页

作者： Yangyang Yu Kejing Wu Shiyu Lu Kui Ma Shan Zhong Hegui Zhang Yingming Zhu Jing Guo Hairong Yue Changjun Liu Siyang Tang Bin Liang Low-Carbon Technology and Chemical Reaction Engineering Laboratory School of Chemical EngineeringSichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610207China Institute for Clean Energy&Advanced Materials Faculty of Materials and EnergySouthwest UniversityChongqing 400715China Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China

TiO2 pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO2, and therefore reduce the lightening power of TiO2. In the present work, a uniform, amorphous, 2.9-nm-thick TiO2 protective layer was deposited onto the surface of anatase TiO2 pigments according to pulsed chemical vapor deposition at room temperature, with Ti Cl4 as titanium precursor. Amorphous TiO2 coating layers exhibited poor photocatalytic activity, leading to a boosted weatherability. Similarly, this coating method is also effective for TiO2 coating with amorphous SiO2 and SnO2 layers. However, the lightening power of amorphous TiO2 layer is higher than those of amorphous SiO2 and SnO2 layers. According to the measurements of photoluminescence lifetime, surface photocurrent density, charge-transfer resistance, and electron spin resonance spectroscopy, it is revealed that the amorphous layer can prevent the migration of photogenerated electrons and holes onto the surface, decreasing the densities of surface electron and hole, and thereby suppress the photocatalytic activity.

关键词： TiO2 pigments Pulsed chemical vapor deposition Ultrathin layer weatherability Lightening power Photocatalytic suppression mechanism

Cerium Oxide Coating of Titanium Dioxide Pigment to improve the weatherability

在线全文

学校读者我要写书评

暂无评论

Cerium Oxide Coating of Titanium Dioxide Pigment to improve ...

Characteristics and properties of surface coated nano-TiO_2

中国化学会第九届全国无机化学学术会议

作者： Zhao Li Shiyong Yu Inner Mongolia Key Laboratory of Physics and Chemistry of Rare Earth Materials School of Chemistry and Chemical Engineering Inner Mongolia University

Titanium dioxide is the best white pigment, but it does not have good weatherability if it is not properly coated. The untreated Titanium dioxide has photocatalytic activity,it can make the degradation of organic produce, resulting in loss of light, yellowing, chalking phenomenon. The function of the coated film was to capture electrons and holes of the Ti O2 particles produced by the ultraviolet irradiation that otherwise could produce free radicals on the Ti O2 surface. As a change from the conventional coating with silicon or aluminum oxide, its weatherability after coating with the oxides of cerium was investigated. A new more effficient, easier and more accurate method that used rhodamine-B degradation was used to evaluate the weather-stability of the coated Ti O2 particles. The photocatalytic activity of titanium dioxide particles coated with cerium oxide decreases largely. It means a large improvement in the weatherability of titanium dioxide particles coated with cerium oxide was obtained even with a tinycoating amount of 1 wt %, and the pigments were more stable with the 10 wt % film coating of cerium dioxide.

关键词： weatherability titanium dioxide cerium oxide

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2006年第6期7卷 1252-1258页

作者：高家诚邹健谭小伟王勇 College of Materials Science and Engineering Chongqing University

Nano-TiO2 was coated with A12O3,SiO2 and silane coupling agent by chemical liquid *** coating was characterized by Raman spectroscopy,XRD,TEM and *** coating content and anti-ultraviolet capacity of nano-TiO2 were measured by XRF and UV-vis *** results show that dense coatings containing 5% Al2O3 or SiO2 can be obtained by mixing slurry at pH 10,adding coating reagent and neutralization reagent into the slurry for 60 min at 85?95 ℃,and finally aging for 120 *** SiO2 was coated on the surface of nano-TiO2 to form silica gel polymer with a Ti—O—Si bond,while aluminum compound exists in the form of AlOOH and part Al(OH)*** integrated dense film can shield photocatalysis *** inorganic coating film can increase the wettability for xylene and stability in *** surface modification of nano-TiO2 will not impair its ability for anti-ultraviolet radiation,and more short band ultraviolet radiation can be *** addition,the optimal coating amount of silane coupling agent should be less than 3% and the best wettability for xylene can be reached when the amount is 1.2%.

关键词： nano-TiO2 surface modification coating weatherability dispersing

Effect of Nanocomposites Coatings on Exterior Performance of Bamboo during Aging

在线全文

学校读者我要写书评

暂无评论

Chinese Forestry Science and Technology 2012年第Z1期11卷 29-38页

作者： LI Neng CHEN Yuhe BAO Yongjie ZOU Yijia CAI Hanjiang China National Bamboo Research Center Hangzhou 310000P.R.China

Bamboo deterioration caused by light becomes a significant problem as application of bamboo extends from indoor to *** color and roughness of bamboo are two important exterior *** study focused on UV resistant nano composites coatings for exterior use and what aimed to find a formulation which could enhance the durability of *** kinds of film-forming materials and four kinds of nano particles were used to improve bamboo exterior *** color and roughness of nano composites coatings were measured during accelerated *** aging time was 174 h at the temperature of 50 ℃.The experiment showed nanocomposites coatings had significant improvement in UV-shielding and nearly all the samples presented a darkening tendency in ΔL* and increasing tendency in Δa*,ΔE* and Δ*** orthogonal experiment obtained the least change in color and Ra which could be achieved with nano composites coating made by melamine resin and TiO2 when a* was considered as an important ***-forming material was the only factor which had significant influence on color and roughness when a* was not considered as important index,then melamine resin was the best choice.

关键词： bamboo nanoparticle roughness weatherability

Study on Improving Weattlerability of UV-curable Clearcoats

在线全文

学校读者我要写书评

暂无评论

Study on Improving Weattlerability of UV-curable Clearcoats