SiO2添加量对TiO2薄膜表面特征及亲水性的影响

采用溶胶—凝胶法在载玻片表面制备了均匀透明的TiO2／SiO2超亲水性薄膜。利用XRD、红外光谱(IR)和分光光度计，研究了SiO2添加量对薄膜微结构、透光率、亲水性的影响。结果表明：添加SiO2后，薄膜中TiO2晶粒尺寸变小；在薄膜中，TiO2和SiO2分别单独形成颗粒，但有部分Ti—O—Si键形成，存在部分复合氧化物；由于取代反应，复合氧化物中表面形成Lewis酸，薄膜表面吸附的羟基含量增多且稳定，可提高TiO2薄膜的超亲水特性，其超亲水性状态在暗处可保持很长时间；SiO2添加量为40％时的薄膜亲水性最好。     

SiO_2添加量对TiO_2薄膜表面特征及亲水性的影响

采用溶胶凝胶法在载玻片表面制备了均匀透明的TiO2/SiO2超亲水性薄膜。利用XRD、红外光谱(IR)和分光光度计,研究了SiO2添加量对薄膜微结构、透光率、亲水性的影响。结果表明:添加SiO2后,薄膜中TiO2晶粒尺寸变小;在薄膜中,TiO2和SiO2分别单独形成颗粒,但有部分Ti—O—Si键形成,存在部分复合氧化物;由于取代反应,复合氧化物中表面形成Lewis酸,薄膜表面吸附的羟基含量增多且稳定,可提高TiO2薄膜的超亲水特性,其超亲水性状态在暗处可保持很长时间;SiO2添加量为40%时的薄膜亲水性最好。     

TiO2/SiO2复合薄膜对玻璃亲水性的影响

目的解决玻璃的防雾问题。方法采用溶胶-凝胶法在玻璃表面涂覆SiO2和TiO2复合薄膜,以改变玻璃表面的亲水性。通过全因素试验研究了SiO2溶胶的制备温度、SiO2薄膜的层数及TiO2薄膜的层数对玻璃亲水性的影响。结果 SiO2溶胶的制备温度对玻璃的亲水性影响最大,其次是SiO2层数,最后才是TiO2的层数。随SiO2溶胶的制备温度的升高,以及SiO2层数和TiO2层数的增加,玻璃的亲水性先上升,后基本保持不变。结论玻璃表面亲水改性最佳制备工艺条件是SiO2溶胶制备温度为60℃,2层SiO2薄膜和2层TiO2薄膜。     

纳米TiO2薄膜的制备及自清洁性能研究

通过溶胶一凝胶法在普通钠钙玻璃表面制备均匀透明的纳米TiO2自清洁薄膜。探讨了薄膜制备的工艺条件，并利用X射线衍射（XRD）、紫外分光光度计对薄膜的晶型、晶粒大小和透光率进行了表征，研究了在紫外光照射下薄膜的光催化性能及亲水性能。结果表明，制得的TiO2薄膜具有较强的自清洁性能。     

等离子合金化/热氧化复合技术制备光催化N掺杂TiO2薄膜

目的 提高316 L不锈钢表面的光催化和亲水性能.方法 通过等离子表面合金化技术在316 L不锈钢表面制备结合良好的TiN薄膜,然后对TiN薄膜进行热氧化,得到N掺杂TiO2薄膜.利用X射线衍射仪、X射线光电子能谱仪、扫描电子显微镜及紫外-可见分光光度仪对制备的N掺杂TiO2薄膜进行表征,并通过光催化实验和亲水性实验考察其光催化性能和亲水性.结果 经过空气中450℃氧化处理2 h的薄膜中存在锐钛矿晶型的TiO2,样品中的N元素取代了部分O.未掺杂TiO2和N掺杂TiO2的带隙宽度分别为3.25、3.08 eV.经热氧化处理后,薄膜表面致密,无裂纹和微孔,均匀分布着尺寸相近的微小凸起物.经可见光照射150 min后,N掺杂TiO2薄膜对亚甲基蓝溶液的最终降解率为20%.此外,N掺杂TiO2薄膜具有较高的亲水性,可见光照射下,30min内接触角降为8.5°.结论 N掺杂TiO2薄膜能有效提高316 L不锈钢表面的光催化和亲水性能.     

TiO_2-SiO_2复合薄膜的常温制备及其性能

采用溶胶-凝胶法合成具有锐钛矿型TiO2晶粒的TiO2-SiO2复合溶胶,通过浸渍提拉工艺常温制备TiO2-SiO2复合薄膜。考察正硅酸乙酯(TEOS)用量对薄膜结构及性能的影响。结果表明:随着TEOS用量的增加,溶胶的稳定性降低,薄膜的透光率及光催化活性先增大后减小。在Si:Ti摩尔比为1:8时,复合溶胶与薄膜的综合性能达到最优;与单一TiO2溶胶相比,TiO2-SiO2复合溶胶的平均粒度从44增大到75nm;与单一TiO2薄膜相比,TiO2-SiO2复合薄膜的表面粗糙度增大,对罗丹明B的分解率从46.1%提高到67.0%,对水接触角由16°下降到3°,透光率显著增强。     

粒子型TiO_2溶胶和薄膜的制备与性能

利用纳米TiO2粉体制备粒子型TiO2纳米溶胶,并采用浸渍提拉法在普通玻璃表面制备TiO2纳米薄膜。研究粒子型溶胶的胶体特性以及薄膜的表观形貌、透光性、亲水性和光催化性能。结果表明:粒子型TiO2纳米溶胶的常温晶相为锐钛矿相,500℃以后逐步向金红石相转变;TiO2纳米薄膜具有良好的可见光透过性,强的紫外吸收能力,从而具有很好的紫外光光催化性能,同时还具有一定的可见光响应和亲水性能。     

溶胶-凝胶法制备TiO2-SiO2系亲水性薄膜的研究

采用溶胶-凝胶(sol-gel)法在陶瓷釉面砖表面制备了TiO2-SiO2系亲水性薄膜.利用XRD、AFM、FTIR、热显微镜润湿角测角仪等,研究了SiO2添加量对薄膜的微结构和亲水性等的影响.结果表明:薄膜中TiO2晶粒尺寸随着SiO2含量的增加而减小;TiO2和SiO2分别单独成相,并有Ti-O-Si键形成,存在部分复合氧化物,在光照条件下,由于取代反应,复合氧化物的表面易形成Lewis酸,薄膜表面吸附的羟基含量增多且稳定,SiO2摩尔分数为0.4时,润湿角小于5°,薄膜的超亲水状态可在停止光照后长时间存在.     

金属钛表面微纳结构制备表征及其亲疏水性研究

利用阳极氧化法在TA1基底上制备了不同形貌的TiO2纳米薄膜。通过改变其氧化参数来控制薄膜的微观形貌,再在薄膜表面修饰低表面能物质以控制其表面能,制备出超亲水、亲水、疏水及超疏水表面,分析了影响表面润湿性的因素,材料表面微纳结构及表面能量共同决定固体表面的润湿性,在高能表面制备微纳结构则显示超亲水性,在低能表面制备微纳结构则表现超疏水性。实验表明,通过改变阳极氧化参数和表面修饰氟硅烷的方法控制TiO2表面的润湿性简单方便可行。     

不锈钢表面TiO2薄膜的溶胶-凝胶法制备及其性能

通过溶胶-凝胶法在316L不锈钢表面制备TiO2薄膜.研究发现,经500℃热处理1h的TiO2主要由锐钛矿相构成,随着热处理温度的提高,锐钛矿相逐渐转变为金红石相.降解结晶紫水溶液和对水的接触角结果测试表明,随着涂膜次数的增加,TiO2薄膜的光催化性和亲水性都有一定的提高.电化学腐蚀测试说明,表面涂有TiO2薄膜的316L不锈钢的耐腐蚀性提高,薄膜对基体起到了一定的保护作用.     

聚吡咯改性聚偏氟乙烯膜的电学特性及生物相容性

聚偏氟乙烯因具有生物相容性、压电性及良好的机械性能而在生物医用中备受关注。利用电化学法在聚偏氟乙烯膜表面沉积聚吡咯涂层以表面改性聚偏氟乙烯膜,研究了聚吡咯纳米颗粒和纳米线结构涂层对聚偏氟乙烯膜的表面亲水性、电学特性及生物相容性的影响。采用扫描电镜和原子力显微镜观察了纳米结构聚吡咯涂层改性聚偏氟乙烯膜的表面形貌;利用表面接触角测量仪、原子力显微镜研究了改性聚偏氟乙烯膜的亲水性和电学特性;通过体外矿化、细胞死活染色和CCK-8检测方法探讨了改性聚偏氟乙烯膜的生物相容性。结果表明：纳米结构聚吡咯涂层改性聚偏氟乙烯膜的表面亲水性、表面电势分布及生物相容性明显提高了,有利于表面类骨矿物的沉积及细胞的粘附与增殖。此外,纳米线结构聚吡咯改性的聚偏氟乙烯膜具有更高的亲水性、表面电势分布,更有利于细胞粘附与增殖。     

TLM合金表面微弧氧化膜的制备及其生物相容性研究

在新型近β钛合金TLM(Ti-3Zr-2Sn-3Mo-15Nb)表面分别用3种不同的微弧氧化工艺(普通微弧氧化、复相微弧氧化、紫外光照射微弧氧化)镀上一层TiO2薄膜,并考察了3种薄膜的亲水性和抗腐蚀性能。XRD和SEM测试结果表明,3种微弧氧化膜均是多孔膜,主要由金红石相和锐钛矿相组成,普通微弧氧化法和紫外光照射微弧氧化法制备的薄膜表面更为光滑;接触角测试结果表明,紫外光照射微弧氧化膜的表面亲水性最好;电化学腐蚀实验显示,3种工艺所得的氧化膜都具有较好的抗腐蚀性能,普通微弧氧化膜的抗腐蚀能力稍好于另外两种薄膜。     

Effects of pH and polyethylene glycol on surface morphology of TiO2 thin film

In this investigation, a sol gel procedure for preparation of TiO₂ thin films was developed using polyethylene glycol (PEG). Effect of pH on the structure of the films was also investigated. The morphology and surface structure of the films were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). It was found that the films from the base sols had a porous structure and the surface was considerably rough. However, the films made by the acid sols were very dense and had a relatively smoother surface. It was also found that by using PEG, the surface area of the film became larger as a result of the increase in the film porosity. BET analysis confirmed the increase in the surface area which enhanced the photocatalytic activity of TiO₂ thin film in degradation of Malachite Oxalate Green.     

磁控溅射法ZnO-TiO2复合薄膜的制备及性能

采用双靶共溅射的方法在FJL600EI型超高真空多功能磁控溅射仪上制备不同复合量的ZnO-TiO2复合薄膜,对不同工艺参数制备的ZnO-TiO2复合薄膜进行形貌结构分析、光催化性测定和亲水性检测。结果表明,当Ti靶材的溅射功率为150 W时,得到了颗粒大小均匀的ZnO-TiO2复合薄膜,且复合薄膜对甲基橙的降解率最高,亲水性最优。ZnO-TiO2薄膜的光催化性明显高于单一ZnO薄膜。     

Preparation and characterization of non-evaporable porous Ti-Zr-V getter films

Highly porous TiZrV film getters on (100) silicon substrates have been successfully grown by the glancing angle dc magnetron sputtering method. The glancing angle is defined as the angle between the surface normal to the substrate and the surface normal to the target. The main deposition parameters that produce the porous TiZrV films are the pressure of sputtering gas Ar and glancing angle at room temperature. The larger the glancing angle is, the higher the porosity and specific surface area of the TiZrV films are. The specific surface area of the dense and porous TiZrV films is 2 m²/g and 13 m²/g, respectively. The diameter of columnar width and inter-distance between the columnar crystals of the porous film are 200 nm and 50 nm, respectively. The columnar width of dense TiZrV films is about 100 nm. The porous TiZrV films have a larger capability to absorb oxygen than that of the dense TiZrV films.     

沉积压力对磁控溅射WS2薄膜摩擦学性能的影响

目的研究不同沉积压力对磁控溅射WS2薄膜微观结构、力学性能和摩擦学性能的影响。方法采用射频磁控溅射法制备WS2薄膜。利用扫描电镜(SEM)和X射线衍射仪(XRD)对薄膜微观形貌、成分和晶相结构进行表征。用纳米压痕仪、摩擦磨损试验机和白光干涉三维形貌仪测试薄膜的力学性能和摩擦磨损性能。结果随着沉积压力增大,WS2薄膜疏松多孔结构明显降低,粗大柱状晶显著细化,薄膜致密度得到有效改善。沉积压力大于0.8Pa时,WS2薄膜表现出明显的(101)晶面择优取向。WS2薄膜硬度变化与薄膜中S/W原子比变化趋势相反,弹性模量逐渐减小。沉积压力0.4 Pa时,由于WS2薄膜大部分易滑移(002)晶面平行于基体表面,摩擦系数最低,为0.092,但其耐磨性能最差。沉积压为1.6 Pa时,WS2薄膜的磨损率最低,为2.34×10^-7 mm^3/(N·m),表现出良好的耐磨性能。结论改变沉积压力可以显著提高WS2薄膜致密度,改善薄膜的力学性能,提升WS2薄膜的摩擦磨损性能。     

EIS characterisation of Ti anodic oxide porous films formed using modulated potential

Titanium, due to its excellent corrosion resistance, good mechanical properties and biocompatibility has been employed in many fields, such as in biomedical and dental implants. A passive oxide film formed on titanium surface is responsible for its high corrosion resistance. In the present study, oxide films were grown on titanium surface employing an anodising procedure using modulated potential, in a hydrofluoric acid solution. Electrochemical impedance spectroscopy was used to study the electrochemical behaviour of anodised Ti surface in a NaCl solution. The dependence of oxide film characteristics on forming conditions was analysed employing equivalent circuits. Samples were observed by scanning electron microscopy, in Jeol-JSM-5900LV microscope of the LME/LNLS, Campinas. It was observed that final anodising potential has an influence on the porous layer film morphology and that the anodising procedure with the chosen solution produces a double layer porous anodic film.     

Hydrophilic property of SiO2-TiO2 overlayer films and TiO2／SiO2 mixing films

The photo-induced hydrophilicity of SiO2 overlayer on TiO2 films prepared by sol-gel method was investigated by means of soak angle measurement, XPS, UV-VIS and FTIR spectra. The results show that, compared with the TiO2 film without SiO2 overlayer, when the TiO2 film is thoroughly covered by SiO2 overlayer, the hydrophilicity and the sustained effect are enhanced. It is found that the significant growth of the OH- group occurs in the surface of SiO2 overlayer. The different mechanism of enhanced hydrophilicity between SiO2 overlayer on TiO2 films and TiO2/SiO2 mixing films was analyzed. The result suggests that the photo-generated electrons created in the interface between TiO2 and SiO2 tend to reduce the Ti(Ⅳ) cation to the Ti( Ⅲ ) state, and the photogenerated holes transmit through the SiO2 layer to uppermost surface efficiently. Once the holes go up to the surface， they tend to make the surface hydrophilic. The stable hydrophilicity of SiO2 overlayer which adsorbs more stable OH groups, enhances the sustained effect, i.e. the super-hydrophilic state can be maintained for a long time in dark place.     

Characterization and Application of Diamond like Carbon Films

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