锐钛矿型TiO2胶体制备抗菌陶瓷的特性研究

利用锐钛矿晶型的纳米TiO2胶体溶液，将硅胶作为粘结剂按不同配比加入TiO2胶体，用提拉法在陶瓷表面形成均匀薄膜并在高温下烘烤成膜。研究TiO2和硅胶在不同比例情况下的薄膜特性，讨论了退火温度对亲水性及光催化活性的影响，利用分光光度计测量了TiO2薄膜对亚甲基蓝的分解活性，测定了薄膜对洗涤剂、消毒剂、3％NaOH和沸水的抗腐蚀能力。结果表明，利用这种方法制备的薄膜具有较好的光致亲水性和光催化性，并具有良好的抗腐蚀能力。     

Sb对直流反应磁控溅射制备TiO2薄膜的影响

用直流磁控溅射方法在Si(100)面及载玻片上制备了Sb掺杂TiO2薄膜.利用XRD光谱研究了Sb对其薄膜结晶情况的影响,用AFM观察其表面形貌,利用分光光度计测量了TiO2薄膜的光学特性及其对亚甲基蓝的分解活性,通过测量和计算表面对水的接触角来衡量光致亲水性.研究结果表明纯TiO2薄膜为锐钛矿型,适量Sb的掺杂能使TiO2薄膜的结晶有显著改善,并出现Ti2O3和金红石相TiO2,薄膜的光催化活性和光致亲水性明显改善.随着掺杂量的增加,TiO2薄膜的吸收边逐渐红移.但Sb掺杂过量时,破坏了二氧化钛原有的晶格结构,光催化活性和光致亲水性也相应降低.     

衬底对溶胶凝胶法制备TiO2薄膜性能的影响

以钛酸丁酯为前驱体,经浸渍拉膜法在不锈钢以及表面预镀一层非晶态SiO2薄膜的不锈钢表面镀TiO2薄膜.利用XRD、FE-SEM研究了薄膜晶体结构与表面形貌,同时研究了不同衬底上薄膜光催化活性和亲水性,并与以玻璃为衬底的作比较.结果表明,衬底对TiO2薄膜表面形貌及性能的影响很大.以不锈钢为衬底的TiO2薄膜性能光催化活性较弱,但在表面预镀一层非晶态SiO2后TiO2薄膜的光催化活性有所改善.     

大规模真空蒸镀二氧化钛薄膜及其表征

采用大型真空镀膜设备在玻璃基底上蒸镀二氧化钛(TiO2)薄膜,并对TiO2薄膜进行了SEM、AFM、XRD、紫外可见光吸收光谱、亲水性的测试及分析,探讨了退火温度对薄膜性能的影响.结果表明制备的TiO2薄膜具有良好的均匀性.在室温条件下,TiO2薄膜具有无定型的结构;在300～500℃的条件下,TiO2薄膜退火2h后以锐铁矿晶型为主,600℃退火的TiO2薄膜明显向金红石型转变.随退火温度的升高,薄膜对紫外光和可见光的吸收有明显提高,并出现了明显的红移现象.另外,亲水性也随退火温度的升高而变强,500和600℃退火的TiO2薄膜表面出现超亲水性.     

反应磁控溅射制备超亲水性SiO2/TiO2多层膜的研究

本文采用反应磁控溅射的方法在玻璃基片上制备TiO2及SiO2／TiO2多层膜，利用X射线衍射（XRD）、原子力显微镜（AFM）、接触角测定等分析方法对试样进行表征。研究了不同制备工艺对薄膜亲水性能的影响，初步讨论了SiO2／TiO2多层膜的超亲水性机理。结果表明这种多层膜结构，其底层SiO2作用在于阻止玻璃中的钠离子在溅射过程中向薄膜中的扩散，适当厚度的顶层SiO2，一方面利用到了SiO2本身的亲水性，同时也利用到了TiO2薄膜的光致亲水性。因此在制备TiO2超亲水性薄膜的时候，考虑制备SiO2底层和顶层对于亲水性效果有明显的改善作用。     

TiO2复合薄膜光生亲水及防结雾性能研究

利用中频交流磁控溅射技术制备了TiO2薄膜、Ag/TiO2复合薄膜和TiO2:MoO3复合薄膜,研究了TiO2薄膜的光生亲水性和防结雾特性,讨论Ag及MoO3对TiO2薄膜光生亲水性的影响.发现:制备的TiO2薄膜有良好的光生亲水性和防结雾效果,同时薄膜越厚其光生亲水性越明显.800 nm的TiO2薄膜在TUV辐照3 min后其接触角可下降至2°以下.Ag/TiO2复合薄膜是一种接触角在较大范围内可变的薄膜材料,紫外辐射可使其接触角在120°到0°间调节.而TiO2:MoO3复合薄膜的光生亲水性则远比TiO2薄膜差.     

浸蚀多孔铝模板制备TiO2亲水薄膜材料

利用浸蚀多孔铝模板,涂覆TiO2溶胶和纳米粉组成的料浆,制得TiO2亲水性阵列薄膜。通过对此薄膜SEM及表面接触角分析,研究了聚乙二醇改性、存放时间、SiO2的添加等对其亲水性的影响。结果表明:浸蚀多孔铝模板制备的TiO2薄膜无需紫外光激发即表现出良好的亲水性,5s内可达到完全铺展;料浆中添加0.02～0.04g/mL聚乙二醇能一定程度上提高薄膜材料亲水性并减缓其亲水性的降低;添加纳米SiO2制备的TiO2/SiO2复合薄膜亲水性优于纯TiO2薄膜,经聚乙二醇改性后为超亲水性,超亲水性能在黑暗中维持5天。     

热处理温度对TiO2薄膜光催化及亲水性的影响

采用溶胶-凝胶法及浸渍提拉法在普通的载玻片上制得TiO2薄膜,通过对薄膜及相应粉体的XRD、IR谱及薄膜致密度的测量,分析了热处理温度对TiO2薄膜光催化及超亲水特性的影响.结果表明:薄膜经过不同温度的热处理,光催化活性不同,亲水性能也有显著的差别,经450℃热处理的薄膜光催化活性最高,而在450～550℃的热处理温度范围得到了接触角为0°的超亲水性薄膜;薄膜表面的超亲水性与薄膜中TiO2的晶型、羟基浓度及薄膜的孔隙度有关.     

电子束蒸镀纳米TiO_2薄膜结构、相组成及亲水性研究

利用电子束蒸镀技术在石英玻璃和单晶Si〈100〉上制备了纳米TiO2薄膜,研究了衬底温度和退火温度对其结构、相组成和亲水性能的影响。结果表明,衬底温度为40~240℃时,石英玻璃上制备的薄膜为无定型TiO2,单晶Si〈100〉上制备的薄膜为弱结晶性的金红石TiO2,两类薄膜的亲水性均很差。退火温度显著影响薄膜的相组成及亲水性能。石英玻璃上不同衬底温度制备的TiO2薄膜经550,650℃退火后均转变为锐钛矿TiO2,具有很好的亲水性能。单晶Si〈100〉上不同衬底温度制备的TiO2薄膜经550~950℃退火后,均由金红石和锐钛矿TiO2混晶组成,且随退火温度升高,薄膜中锐钛矿TiO2含量逐渐增加;随退火温度升高,衬底温度为40℃时制备的TiO2薄膜的亲水性能逐渐降低,而衬底温度为240℃时制备的TiO2薄膜的亲水性能逐渐增强。     

TiO2/SnO2复合薄膜的亲水性能研究

采用溶胶-凝胶法制备了TiO2／SnO2复合薄膜，通过XRD、XPS、UV透射光谱的分析及薄膜表面接触角、光催化降解甲基橙等的分析，研究了SnO2与TiO2配比、热处理温度、膜厚度等因素对复合膜的亲水性、透光率及光催化活性的影响。结果表明：复合膜的亲水性和光催化活性均优于单纯TiO2，当SnO2与TiO2的摩尔比为1％-5％时，所制备的薄膜具有超亲水特性；热处理温度为450℃时薄膜亲水性最好，膜厚度的增加有利于亲水性的改善。     

掺银TiO2薄膜的亲水特性

采用溶胶—凝胶法及浸渍提拉法在普通的载玻片上制得含不同掺银量的TiO2薄膜，通过对薄膜及相应粉体的XRD、XPS及薄膜致密度的测量，分析了银的掺杂量对TiO2薄膜亲水特性的影响。结果表明：TiO2薄膜中银的掺杂量≤0．635mol％时有利于TiO2薄膜亲水性能的改善；表面羟基和表面桥氧的含量对TiO2薄膜的亲水性能均有直接影响。     

TiO2膜/硅胶复合微球的制备及光催化性能

采用硅胶微球为载体,以TiO2溶胶为涂膜液,制备TiO2膜/硅胶复合微球,用XRD,FT-IR和显微镜等对催化剂的物相、形貌行了表征,并考察其对甲基橙溶液的光催化降解性能.结果表明:TiO2膜和硅胶微球之间存在化学键合作用,涂膜5层微球粒径为0.5～3mm,呈白色,水溶液中透明,是理想的光催化材料.其光催化性能随涂膜层数和催化剂用量的增加而增大,涂膜的5层微球甲基橙降解率可达85%.     

Laser damage properties of TiO2/Al2O3 thin films grown by atomic layer deposition

Research on thin film deposited by atomic layer deposition (ALD) for laser damage resistance is rare. In this paper, it has been used to deposit TiO(2)/Al(2)O(3) films at 110 °C and 280 °C on fused silica and BK7 substrates. Microstructure of the thin films was investigated by x-ray diffraction. The laser-induced damage threshold (LIDT) of samples was measured by a damage test system. Damage morphology was studied under a Nomarski differential interference contrast microscope and further checked under an atomic force microscope. Multilayers deposited at different temperatures were compared. The results show that the films deposited by ALD had better uniformity and transmission; in this paper, the uniformity is better than 99% over 100 mm Φ samples, and the transmission is more than 99.8% at 1064 nm. Deposition temperature affects the deposition rate and the thin film microstructure and further influences the LIDT of the thin films. As to the TiO(2)/Al(2)O(3) films, the LIDTs were 6.73±0.47 J/cm(2) and 6.5±0.46 J/cm(2) at 110 °C on fused silica and BK7 substrates, respectively. The LIDTs at 11 °C are notably better than 280 °C.     

Fabrication of a pure TiO2 thin film using a self-polymeric titania nano-sol and its properties

A pure TiO2 thin film without adding any organic binder was fabricated by using a self-polymeric titania nano-sol (14 mass%), which was prepared by the acid peptization method. The particle size distribution in the 14 mass% TiO2 sol, in which almost of particles had a size below 10.2 nm and the crystal phase confirmed by X-ray diffraction analysis was anatase. The diluted nano-sol had a capability to form a thin film at a low temperature (100-400 degrees C) on the slide glass by dipping method. The average thickness of a coating film was measured to be about 0.25-0.30 microm. A coated film had a high refractive index over 1.88 at least irrespective of the heat-treatment even at room temperature drying and showed a super-hydrophilicity (< 5 degrees) after 20 minutes under Ultra Violet light irradiation, and it sustained in the darkness during a long period over 7 days depending on the heat-treatment conditions. Atomic Force Microscopic observation shows that the morphology of a heat-treated film had a relationship with the long-term hydrophilicity in the darkness.     

Characterization of Sol-gel-derived TiO2 and TiO2-SiO2 Films for Biomedical Applications

In order to improve the corrosion resistance and biocompatibility of NiTi surgical alloy, TiO2 and TiO2-SiO2 thin films were prepared by sol-gel method. The surface characteristics of the film, which include surface composition, microstructure and surface morphology, were studied by X-ray diffraction (XRD), atomic force microscopy (AFM) and X-ray photoelectron spectra (XPS), respectively. A scratching test was used to assess the interface adhesive strength between the film and substrate. The corrosion resistance of NiTi alloy coated with oxide films were studied by anodic polarization curves measurement in biological solution. Additionally, a preliminary study of the in vitro bioactivity of the films was conducted. The results indicated that TiO2 and TiO2-SiO2 (Ti/Si=4:1) films have higher electrochemical corrosion resistance and can be used as protective layers on NiTi alloy. In addition, TiO2-SiO2 composite films have better bioactivity than TiO2 film.     

聚乙烯醇/二氧化硅共混膜的制备及耐温、耐溶剂性能研究

以聚乙烯醇（PVA）和正硅酸乙酯（TEOS）为原料,通过溶胶－凝胶（Sol-Gel)方法,制备出不同二氧化硅含量的聚乙烯醇／二氧化硅（PVA／SiO2)共混均质膜。通过热重分析（TGA）、示差扫描量热法（DSC）和动态力学分析（DMA）研究了共混膜的热性能。结果表明,与PVA膜相比,PVA／SiO2共混膜具有更高的热稳定性,随SiO2含量的增大,共混膜的分解温度升高,玻璃化温度也略有提高。以水为溶剂,测定了共混膜的耐溶剂性能。与PVA膜相比,PVA／SiO2共混膜的耐溶剂性能有显著的提高。     

微波辐射溶胶-凝胶法制备TiO2薄膜及其降解铬黑T的活性

通过微波辐射溶胶一凝胶法（sol-gel）法在导电玻璃（ITO）基体上制备TiO2纳米薄膜光催化剂，考察不同加热方式、微波时间、酸处理、薄膜层数等对TiO2纳米粒子及薄膜的影响。以可见光谱（UV-VIS）、X射线衍射（XRD）对TiO2薄膜进行了表征，并通过薄膜光催化降解铬黑T溶液的性能进行了研究。实验表明，ITO玻璃表面的TiO2纳米薄膜经HNO3和微波处理后，因协同效应使薄膜的光催化活性大大增强。     

溶胶-凝胶法在3D-SiC陶瓷表面浸涂Al_2O_3薄膜的研究

以无机盐Al(NO_3)_3·9H_2O为先驱体、水为溶剂,加入不同浓度的胶溶剂HNO_3,采用溶胶-凝胶(Solgel)法制备了勃姆石(γ-AlOOH)溶胶.分别以溶液下降法和真空浸渍法在三维网络碳化硅陶瓷骨架(3D-SiC)表面浸涂γ-AlOOH溶胶,采用不同烧结制度在3D-SiC表面生成了Al_2O_3薄膜.采用X射线衍射仪(XRD)、红外光谱仪(IR)和扫描电子显微镜(SEM)分析了薄膜的物相和显微结构,并检测了薄膜的抗热震性.结果表明,采用真空浸渍法在3D-SiC表面浸涂加入浓度0.22mol/L HNO_3制备的γ-AlOOH溶胶能烧结形成致密平整的Al_2O_3薄膜.升高烧结温度,Al_2O_3晶粒长大,900℃时薄膜最致密且能观测到玻璃态显微结构.薄膜的抗热震性随烧结温度升高而提高.     

多晶纳米ZnO薄膜的溶胶-凝胶法制备及光催化性能研究

在石英玻璃衬底上用溶胶-凝胶法制备了纳米级的多晶ZnO薄膜,通过XRD、AFM和UV-Vis吸收光谱对薄膜进行了表征;以苯酚作为被降解的物质,研究了退火温度、降解温度、苯酚溶液的初始浓度和空气流量对ZnO薄膜光催化降解苯酚性能的影响,以及其光催化活性的失活与恢复.实验结果证明,溶胶-凝胶法制备的纳米级ZnO薄膜光催化效果显著,并且可以再生.     

Improved photocatalytic activity of zeolite- and silica-incorporated TiO2 film

Porous TiO2 film was prepared by sol-gel method from TiO2 sol containing polyvinylpyrolidone (PVP). Photocatalytic activity of the film was evaluated by the elimination rate of ethylene. Several adsorbents including zeolite and silica powders were incorporated into the TiO2 film. All the adsorbents enhanced the activity. The optimum adsorbent content was 0.005-0.01 g/ml of the coating sol solution. Silica provided better activity than zeolite. At high humidity and in dry air the activity decreased.