TiO_2在水及丙二醇介质中表面电性质的研究  

Study on Surface Charge Properties of Titanium Dioxide in Water and Propylen e Glycol

作　　者：刘付胜聪[1] 李玉平[1] 胡智荣[1] 卢君[1] 肖汉宁[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082

出　　处：《无机化学学报》2004年第1期79-83,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然 科学基金资助项目(No.50174024)

摘　　要：Surface charge properties of titanium dioxide in water and propylene g lycol have been discussed by proton-transfer phenomena.Electrophoresis shows s ignificant differences between each type of titanium dioxide particles and betwe en the two dispersion media.In aqueous solvent,the sign of the charge for tita nium dioxide would change due to pH and surface chemical composition.However,i n propylene glycol pH value could not result in the sign of the charge for uncoa ted titanium dioxide.Furthermore,the effects of both alumina and silica coatin gs and media on the surface charge properties of titanium dioxide are due to pro ton-transfers.The acidity of hydroxyl groups on oxides surface is believed to be the direct reason that make them have different charge properties in solvents .It is favorable for the hydroxyl groups on the surface of particles to donate protons,as was observed by negative charge pertaining for dispersion in water a t most values of pH.While in propylene glycol titanium dioxide particles are fo rced to accept protons,resulting in positively charged particles.Small amounts of water have a significant effect on the sign of the charge for uncoated titan ium dioxide.Surface charge properties of titanium dioxide in water and propylene g lycol have been discussed by proton-transfer phenomena.Electrophoresis shows s ignificant differences between each type of titanium dioxide particles and betwe en the two dispersion media.In aqueous solvent,the sign of the charge for tita nium dioxide would change due to pH and surface chemical composition.However,i n propylene glycol pH value could not result in the sign of the charge for uncoa ted titanium dioxide.Furthermore,the effects of both alumina and silica coatin gs and media on the surface charge properties of titanium dioxide are due to pro ton-transfers.The acidity of hydroxyl groups on oxides surface is believed to be the direct reason that make them have different charge properties in solvents .It is favorable for the hydroxyl groups on the surface of particles to donate protons,as was observed by negative charge pertaining for dispersion in water a t most values of pH.While in propylene glycol titanium dioxide particles are fo rced to accept protons,resulting in positively charged particles.Small amounts of water have a significant effect on the sign of the charge for uncoated titan ium dioxide.

关 键 词：TIO2 水 丙二醇 表面电性质 质子迁移 二氧化钛 

分 类 号：O614.411[理学—无机化学]