稻壳灰制备掺杂TiO2硅气凝胶研究

以稻壳为硅源制备SiO2气凝胶，在溶胶凝胶过程中加入TiO2纳米粉末，可制得掺杂TiO2硅气凝胶。通过SEM、BET吸附．脱附测试等手段，与同种方法制得的纯SiO2气凝胶在结构和物性特征方面等进行了比较。结果显示，掺杂TiO2气凝胶的平均颗粒直径为50nm左右，而纯SiO2气凝胶的粒径约为20nm，且孔洞直径明显减小、孔径分布更为均匀；此外，TiO2纳米粉末的加入可以使气凝胶的弹性模量提高约23％，并且通过TiO2对气凝胶溶胶-凝胶过程的影响研究了其影响机理。     

PANI/Ag-TiO2纳米纤维复合材料的制备及其抗菌性能研究

采用水热法制备Ag掺杂量不同的Ag/TiO2纳米复合材料,通过原位聚合法制备PANI/Ag-TiO2纳米纤维复合材料,利用XRD、SEM、FT-IR等检测技术对复合材料的结构进行了表征。研究了光源、Ag掺杂量、不同实验菌种等因素对PANI/Ag-TiO2纳米纤维复合材料抗菌性能的影响。结果表明：在无光照射情况下,PANI/Ag-TiO2纳米纤维复合材料具有良好的抗菌性能,在长波紫外光照射情况下,抗菌性能进一步增强。在浓度1 mg/mL时,在无需光照的情况下对4种实验菌种杀菌率均达到99.99%。     

铁离子掺杂聚苯胺涂层的光热杀菌性能

选用聚苯胺（PANI）作为光热材料,采用三氯化铁作为掺杂剂制备铁离子掺杂PANI纳米线,通过静电吸附将铁离子掺杂PANI纳米线均匀负载于纤维素膜表面,形成了PANI杀菌涂层,采用红外（FT-IR）、X射线衍射（XRD）和扫描电子显微镜（SEM）研究材料的结构;通过紫外可见吸收光（UV-vis）和光热升温测试研究材料的吸光和光热性能;通过热重分析仪（TG）研究材料的热稳定性,以闪光灯作光源,选大肠杆菌作为试验菌株,研究涂层的光热杀菌性能。结果表明,铁离子与PANI发生络合,铁离子掺杂PANI的吸光强度、光热转换性能、热稳定性比酸掺杂PANI明显增加,酸掺杂PANI涂层杀菌率为76%,铁离子掺杂PANI涂层杀菌率可达100%。     

酸掺杂聚苯胺复合材料的制备及其pH敏感性研究

目的 探索不同掺杂酸对聚苯胺包覆载药TiO2纳米管(TNTs)复合材料的pH敏感性释药行为的影响.方法 通过化学氧化聚合法分别制备掺杂CA、L-Glu和LABSA的聚苯胺包覆载药TiO2纳米管复合材料(PANI@TNTs-BIT).采用XRD、FT-IR、TEM及TGA测试确定产物结构、形貌及体系载药量,用UV-vis法测定BIT药物在特征吸收波长下的吸光度,并得出吸光度与浓度间的函数关系式,以揭示复合材料的药物释放量与环境pH之间的关系.结果 锐钛矿型TNTs作为防污剂BIT的纳米容器,药物负载高达23％(质量分数).用PANI包覆后,TNTs-BIT的载药率降为9.8％,结合TEM图,说明形成了较厚的PANI包覆层.酸掺杂后的PANI@TNTs-BIT复合材料具有明显的pH敏感性,当环境pH由8.5逐渐下降至5.8时,掺杂L-Glu和LABSA的PANI@TNTs-BIT中BIT的释放量呈快速增长趋势,尤其是掺杂LABSA的材料,不但具有优异的pH响应性释药行为,而且明显缓解了BIT前期"爆释"问题,表现出了高效防污性能.结论 锐钛矿型TNTs可对所负载的BIT药物起到缓/控释作用,而且利用掺杂L-Glu和LABSA的PANI对TNTs-BIT进行包覆后,可实现载药体系及时对环境pH的变化作出响应,从而起到智能调控药物释放量并达到防污的目的.     

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。     

SiO2/TiO2变折射率光学薄膜制造技术研究

探讨了单源混蒸技术制备SiO2/TiO2变折射率薄膜的可行性,分别蒸发SiO2和TiO2质量比为1:1和1:2的混料,研究分析了薄膜折射率的变化情况,并将其与双源共蒸的方法进行了比较.实验中发现,两种材料蒸发方式的差异是影响SiO2/TiO2变折射率薄膜制备的主要因素,尚未发现混料中SiO2和TiO2的质量比与SiO2...     

75％TiO2-25％SiO2氧化物的机械合金化

金红石TiO2是常用的钛阳极耐蚀载体材料。鉴于SiO2具有更高的耐蚀性、耐磨性和稳定性，而且价格低廉。因此，本文尝试以锐钛矿TiO2和石英SiO2颗粒原料，采用机械合金化（MA）方法制备TiO2-SiO2二元氧化物。本文通过30小时机械合金化作用，制备了摩尔浓度为75％TiO2-25％SiO2二元氧化物载体材料。通过XRD、DTA和TEM分析并观测了所获材料的组织结构和晶粒形貌。结果发现在MA作用下，该载体材料中的锐钛矿TiO2显著细化，有部分纳米晶粒出现，SiO2晶粒细化效果相对较弱；透射电镜下，粉末颗粒呈理想的等轴形态；产生了锐钛矿TiO2向金红石TiO2的相变，其相变温度比采用常规方法下的相变温度明显降低了约350℃：获得SiO2、TiO2互溶的固溶体组织，特别是生成了采用常规方法难以获得的TiO2．SiO2非平衡间隙固溶体。     

TiO2/PVB-PANI/PVB双层涂层对不锈钢的防腐机理研究

目的 制备一种新型绿色环保的TiO2/PVB-PANI/PVB双层复合涂层,研究复合涂层对不锈钢在NaCl溶液中的防腐作用机理。方法 使用原位化学氧化法合成聚苯胺（PANI）,以PVB为粘合剂,甲醇为溶剂,用浸渍提拉法和刮涂法在不锈钢表面制备TiO2/PVB-PANI/PVB双层涂层。通过傅里叶变换红外光谱（FT-IR）、紫外可见漫反射（UV-Vis DRS）、X射线衍射（XRD）、扫描电子显微镜（SEM）和X射线能谱（EDS）等方法对材料的官能团、光吸收性能、结构和形貌组成等进行了研究,用电化学方法和划痕浸泡实验对比了TiO2/PVB-PANI/PVB双层涂层和PANI/PVB涂层的耐蚀性能,并分析探讨了相应的防腐蚀机理。结果 TiO2/PVB-PANI/PVB双层涂层光响应电流为250 nA/cm2,与PANI/PVB涂层相比,其光电位下降0.12 V。电化学测试表明,TiO2/PVB-PANI/PVB双层涂层试样相对不锈钢的自腐蚀电位升高,自腐蚀电流密度减小,容抗弧半径增大,光照时,其界面处电化学反应速率明显增加。划痕浸泡实验表明,有无光照下,TiO2/PVB-PANI/PVB双层涂层的耐腐蚀性能均优于PANI/PVB涂层,而光照下两种涂层的耐蚀性能对比更为明显。结论 TiO2/PVB-PANI/PVB双层涂层依靠物理屏蔽、聚苯胺的防腐作用和光致阴极保护的协同作用为不锈钢提供优异的防腐蚀效果。     

Fe-S共掺杂锐钛矿相TiO2的第一性原理研究

利用基于密度泛函理论的第一性原理平面波超软赝势方法对未掺杂、Fe和S单掺杂及Fe-S共掺杂锐钛矿相TiO2的电子结构进行计算,分析Fe、S单掺杂及Fe-S共掺杂对锐钛矿相TiO2的晶体结构、能带、态密度和光吸收性质的影响。结果表明,掺杂后TiO2的晶格发生畸变,原子间键长的变化使晶格发生膨胀;掺杂后TiO2的禁带宽度减小,并在禁带中引入杂质能级,导致TiO2的吸收带边红移;与Fe和S单掺杂相比,Fe-S共掺杂锐钛矿相TiO2的吸收带边红移程度更大。     

泡沫镍负载TiO2和TiO2/3Al2O3·2SiO2薄膜的光催化性能

以泡沫镍为载体,3Al2O3·2SiO2作为过渡中间层,用溶胶-凝胶法在泡沫镍上负载锐钛矿相的TiO2薄膜,制成泡沫金属基的TiO2和TiO2/3Al2O2·2SiO2光催化材料,利用TG-DSC、XRD和FE-SEM等测试手段对其进行表征,用乙醛气体的光催化降解测试其光催化活性.研究表明泡沫镍负载的TiO2和TiO2/3Al2O3·2SiO2薄膜均具有良好的光催化活性,其中,由于负载的3Al2O3·2SiO2过渡中间层增大了载体的比表面积,使负载光催化剂的活性位大大增加,因此,TiO2/3Al2O3·2SiO2薄膜的光催化活性较单一的TiO2薄膜有非常显著的提高.     

Synthesis of iron(Ⅲ)-doped nanostructure TiO2/SiO2 and their photocatalytic activity

Iron(Ⅲ)-doped nanostructure TiO2-coated SiO2 (TiO2/SiO2) particles were prepared using the layer-by-layer assembly technique and their photocatalytic property was studied. TiO2 colloids were synthesized employing the sol-gel method with TiCl4 as a precursor. The samples were characterized by Fourier transform infrared spectroscopy (FTIR), SEM, EDS, XPS, and XRD. The experimental results show that TiO2 nanopowders on the surface of SiO2 particles are well distributed, the amount of TiO2 is increased with the adding of coating layers, the pure anatase-TiO2 coating layers are synthesized at 500℃, and the photocatalytic activity of Fe3+-doped TiO/SiO2 is higher than tnat of undoped TiO2/SiO2.     

光催化TiO2涂层在金属防腐蚀中的应用研究现状

介绍了TiO2的特点、应用概况及金属光催化防腐蚀作业的原理，对光催化TiO2涂层在金属防腐蚀方面的应用研究进展进行了综述。指出了TiO2薄膜在这一领域应用中的优势及存在的问题。     

对甲苯磺酸掺杂聚苯胺对镁的防腐蚀性能

    对甲苯磺酸掺杂化学合成的本征态聚苯胺,得到对甲苯磺酸掺杂聚苯胺,并用紫外可见光光谱和红外光谱对其结构进行了确证;以对甲苯磺酸掺杂聚苯胺为功能成分,羟基丙烯酸树脂为成膜物质,按一定配方涂覆于镁表面,利用开路电位和Tafel极化曲线方法研究了对甲苯磺酸掺杂聚苯胺对金属镁的防腐性能.结果表明,对甲苯磺酸掺杂聚苯胺与羟基丙烯酸树脂混合涂抹的涂料相对本征态聚苯胺与羟基丙烯酸树脂混合涂抹的涂料以及与甲苯磺酸掺杂聚苯胺与环氧树脂混合涂抹的涂料而言,显示了更好的防腐能力.     

Preparation and photocatalytic activity of PANI/TiO2 composite film

1. Introduction As an advanced oxidation technique (AOT), photocatalytic oxidation of semiconductor nanopar-ticles has been widely investigated by several groups during the past two decades [1-2]. Among all types of oxide semiconductor photocatalysts, nano-TiO2 is a very important photocatalyst for its strong oxidiz-ing power, nontoxicity, and long-term photostability [3]. Some researchers have reviewed the photocata-lytic mechanism of nano-TiO2 [4-5]. Generally, when the surface of TiO2 i…     

镁锂合金表面含聚苯胺复合涂层的防腐性能研究

    以过硫酸铵为氧化剂,磺基水杨酸为掺杂剂,用化学氧化法合成了聚苯胺 - 二氧化硅(PANI- SiO₂)复合材料;通过FTIR,XRD和SEM对PANI-SiO₂复合材料进行表征;以PANI-SiO₂粉末为功能成分,环氧树脂为成膜物质,在镁锂合金表面制备了PANI-SiO₂/环氧树脂复合涂层,用开路电位和交流阻抗谱研究了涂层的防腐蚀性能.结果表明,在3.0 mass%的NaC1溶液中,PANI-SiO2/环氧树脂复合涂层具有很好的防腐性能,且认为PANI的存在使得镁锂合金表面生成一层钝化膜.     

磁性纳米光催化剂的制备及其光催化性能

以Fe3O4为载体,制备了易于固液分离回收的磁性复合纳米光催化剂,采用SEM,元素分析,XRD等方法表征催化剂的表面形貌,晶体结构,结果表明,二氧化钛包裹在Fe3O4的表面,其包裹量越大,粒径越大,锐钛矿峰越强,利用光催化降解甲基橙的效果来考察磁性复合光催化剂的活性,直接包裹在Fe2O4表面的TiO2活性低于纯TiO2的,而在Fe3O4与TiO2之间包裹SiO2,可以有效地提高其光催化活性,其活性与纯TiO2接近。     

Corrosion protection of aluminum alloy by epoxy coatings containing polyaniline modified graphene additives

In the study, polyaniline/reduced‐graphene oxide (PANI‐RGO) composites, fabricated by loading 2, 5, and 8wt% graphene oxide, was prepared by in‐situ emulsion polymerization and reduction. They are characterized by Fourier transform infrared spectroscopy, X‐ray diffraction, and scanning electron microscopy. Epoxy coatings adding PANI and PANI‐RGO composites were coated on the surface of AA5083 Al alloy. The anticorrosion performance of the coatings is measured by electrochemical impedance spectroscopy and potentiodynamic polarization curve in 3.5wt% NaCl solution. The results demonstrate that the epoxy/PANI‐RGO coating exhibits a better protection against AA5083 alloy corrosion compared with the epoxy/PANI coating. Enhancement of the passivation performance of PANI was obtained by the addition of RGO into epoxy/PANI coating system.     

Grain Size and Wettability of TiO2/SiO2 Photocatalytic Composite Thin Films

The uniform transparent TiO2/SiO2 photocatalytic composite thin films are prepared by sol-gel method on the soda lime glass substrates, and characterized by UV-visible spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), BET surface area, FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that the addition of SiO2 to TiO2 thin films can suppress the grain growth of TiO2 crystal, increase the hydroxyl content on the surface of TiO2 films, lower the contact angle for water on TiO2 films and enhance the hydrophilic property of TiO2 films. The super-hydrophilic TiO2/SiO2 photocatalytic composite thin films with the contact angle of 0-° are obtained by the addition of 10%-20% SiO2 in mole fraction.     

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.