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A Eu-based metal-organic framework fluorescent film:Preparation and sensing of Cr2O72- and tryptamine 认领 引用
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作者 JIAO Xinyi ZHANG Xin +5 位作者 BAI Wanqiao SUN Xuehua CUI Huali REN Yixia CHAI Hongmei GAO Loujun 《无机化学学报》 SCIE CAS CSCD 北大核心 2026年第5期1113-1120,共8页
To address the challenges of poor solubility and difficult recyclability of powdered metal-organic frameworks(MOFs),a Eu-based MOF complex,[EuNa(L)(H2O)3]·2H2O(Eu/Na-MOF),was synthesized by the hydrother... To address the challenges of poor solubility and difficult recyclability of powdered metal-organic frameworks(MOFs),a Eu-based MOF complex,[EuNa(L)(H2O)3]·2H2O(Eu/Na-MOF),was synthesized by the hydrothermal method using 3,5-bis(3,5-dicarboxyphenyl)-1H-1,2,4-triazole(H4L)as the ligand in this study.Systematic characterization and performance evaluation revealed that the complex exhibits a unique 3D structure,high phase purity,excellent thermal stability,and outstanding luminescent properties.Furthermore,the complex was encapsulated in poly(methyl methacrylate)(PMMA)to fabricate a flexible and water-washable composite fluorescent film(Eu/NaMOF/PMMA).Based on static and dynamic quenching mechanisms,respectively,the film enables reversible detection of tryptamine and Cr2O72- ions in aqueous solutions,demonstrating high selectivity,stability,and portability. 展开更多
关键词 metal-organic framework Eu/Na-MOF fluorescent film sensor tryptamine Cr2O72-
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二陈汤通过Nrf2/HO-1信号通路调节氧化应激和代谢紊乱改善SiO2诱导的肺损伤 认领 引用
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作者 芦俊 朱馨怡 +6 位作者 刘子怡 胡吉霞 陈佳露 肖荣 王智槟 刘畅 卢芳国 《中国实验方剂学杂志》 CAS CSCD 北大核心 2026年第13期32-42,共11页
目的:观察二陈汤对二氧化硅(SiO2)诱导肺损伤大鼠的保护作用,探讨其作用机制。方法:采用一次性气管滴注50 g·L-1 SiO2混悬液建立肺损伤大鼠模型。将30只雄性SD大鼠随机分为正常组,模型组,二陈汤低、高剂量组(4.5、9 g·k... 目的:观察二陈汤对二氧化硅(SiO2)诱导肺损伤大鼠的保护作用,探讨其作用机制。方法:采用一次性气管滴注50 g·L-1 SiO2混悬液建立肺损伤大鼠模型。将30只雄性SD大鼠随机分为正常组,模型组,二陈汤低、高剂量组(4.5、9 g·kg-1·d-1)和地塞米松组(0.2 mg·kg-1·d-1),连续干预4周。苏木素-伊红(HE)染色观察肺组织病理变化;生化法检测肺组织丙二醛(MDA)、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GPX)水平;实时荧光定量聚合酶链式反应(Real-time PCR)、蛋白免疫印迹法(Western blot)及免疫荧光法检测核因子E2相关因子2(Nrf2)/血红素加氧酶-1(HO-1)信号通路关键分子的表达。超高效液相色谱-串联质谱法(UPLC-MS/MS)鉴定二陈汤主要活性成分,结合分子对接技术评估其核心成分与Nrf2/HO-1的结合能力。超高效液相色谱-四极杆-飞行时间质谱法(UPLC-Q-TOF-MS)非靶向代谢组学技术分析肺组织代谢谱,相关性分析筛选与Nrf2/HO-1信号通路密切相关的差异代谢物及指标。结果:与正常组比较,模型组大鼠体质量增长率显著降低,肺指数显著升高,肺组织MDA含量显著升高,SOD和GPX活性明显降低,Nrf2 mRNA及蛋白表达明显降低,HO-1、GPX4蛋白表达明显降低,Kelch样ECH关联蛋白1(Keap1)蛋白明显升高(P<0.05,P<0.01)。与模型组比较,二陈汤明显减缓SiO2诱导的大鼠体质量下降趋势(P<0.05);减轻大鼠肺泡炎性细胞浸润和矽结节形成;降低肺组织MDA含量,提高SOD和GPX活性(P<0.05,P<0.01)。UPLC-MS/MS和分子对接结果显示橙皮苷、甘草酸等二陈汤核心成分与Nrf2/HO-1具有强结合亲和力;分子生物学实验表明二陈汤可促进Nrf2核转位,上调HO-1、GPX4 mRNA及蛋白表达,下调Keap1表达(P<0.05,P<0.01)。代谢组学结果显示,二陈汤可回调SiO2诱导的亚油酸、谷氨酰胺等代谢物异常表达(P<0.05,P<0.01)。相关性分析表明,Nrf2、HO-1与SOD、GPX呈明显正相关(P<0.05,P<0.01),与谷氨酰胺、丝氨酸呈明显负相关(P<0.05,P<0.01)。结论:二陈汤可能通过核心成分激活Nrf2/HO-1信号通路,调节氧化应激及代谢紊乱,从而改善SiO2诱导的大鼠肺损伤,为防治职业性肺损伤提供实验依据。 展开更多
关键词 二陈汤 二氧化硅(SiO2) 肺损伤 核因子E2相关因子2(Nrf2)/血红素加氧酶-1(HO-1)信号通路 氧化应激 代谢紊乱
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Flexible, magnetic and sandwich-structural Fe2O3/CNT/Fe2O3 composite film with absorption-dominant EMI shielding performance 认领 引用 被引量：4
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作者 Mengmeng Wang Li Tian +4 位作者 Xiao You Junmin Zhang Qinggang Li Jinshan Yang Shaoming Dong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第24期122-132,共11页
To mitigate secondary electromagnetic pollution,there is an urgent need to develop absorption-dominant electromagnetic interference(EMI)shielding materials with low density,reduced thickness,lightweight construction,f... To mitigate secondary electromagnetic pollution,there is an urgent need to develop absorption-dominant electromagnetic interference(EMI)shielding materials with low density,reduced thickness,lightweight construction,flexibility,exceptional mechanical strength,and superior electrothermal and photothermal properties,particularly for flexible and wearable electronics.In this regard,we designed an absorption-based composite film comprising carbon nanotubes(CNT)and α-Fe2O3,featuring a CNT layer sandwiched between twoα-Fe2O3layers on the upper and lower surfaces.This composite film was fabricated through an electrodeposition process followed by a thermal annealing procedure to achieve enhanced EMI shielding performance along with improved electrothermal and photothermal properties.The strategically designed sandwich structure allows the rough surface of the upper α-Fe2O3layer to not only improve the impedance mismatch between free space and the composite film,facilitating the penetration of incident electromagnetic(EM)waves into the film and promoting increased EM absorption rather than reflection,but also to enhance electrical conductivity,thereby improving electron mobility and density.Consequently,the average total shielding effectiveness(SE)of the CNT/Fe16-300 composite demonstrates remarkable EMI shielding effectiveness(EMI SE:56.8 dB).Furthermore,the alteration in the absorption-to-reflection ratio(A/R)signifies a transition in the EMI shielding mechanism from reflection(0.69 for the pristine CNT film)to absorption(1.86 for the CNT/Fe16-300)with the incremental deposition of α-Fe2O3nanoparticles.This work presents a feasible manufacturing approach for developing composite films with a sandwich structure that exhibits absorption-dominant EMI shielding capabilities,contributing to advancements in thermal management and multifunctional electromagnetic shielding applications. 展开更多
关键词 Absorption-dominant electromagnetic interference CNT/Fe16-300 composite film Sandwich structure α-Fe2O3layer
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Corrosion Resistance of Sintered NdFeB Permanent Magnet With Ni-P/TiO_2 Composite Film 认领 引用 被引量：20
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作者 SONG Lai-zhou YANG Zhi-yong 《Journal of Iron and Steel Research International》 SCIE CAS 2009年第3期89-94,共6页
The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction （XRD）,environmental scanning electron microscopy （ESEM）,and energy dispersive X-ray spectrometer （EDX）. The c... The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction （XRD）,environmental scanning electron microscopy （ESEM）,and energy dispersive X-ray spectrometer （EDX）. The corrosion resistance of Ni-P/TiO2 film coated on NdFeB magnet,in 0.5 mol/L NaCl solution,was studied by potentiodynamic polarization,salt spray test and electrochemical impedance spectroscopy （EIS） techniques. The self-corrosion current density （icorr） and the polarization resistance （Rp） of Ni-P/TiO2 film are 0.22 μA/cm2 （about 14% of that of Ni-P coating）,and 120 kΩ·cm2 （about 2 times of that of Ni-P coating）,respectively. The anti-salt spray time of Ni-P/TiO2 film is about 2.5 times of that of the Ni-P coating. The results indicate that Ni-P/TiO2 film has a better corrosion resistance than Ni-P coating,and the composite film increases the corrosion resistance of NdFeB magnet markedly. 展开更多
关键词 sintered NdFeB permanent magnet Ni-P/TiO2 composite film sodium chloride solution corrosion resistance
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The effects of radiation damage on power VDMOS devices with composite SiO_2-Si_3N_4 films 认领 引用 被引量：3
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作者 高博 刘刚 +5 位作者 王立新 韩郑生 宋李梅 张彦飞 腾瑞 吴海舟 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期393-398,共6页
Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships amon... Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships among the important electrical parameters of the samples with different thickness SiO2-Si3N4 films,such as threshold voltage,breakdown voltage,and on-state resistance in accumulated dose,are discussed.The total dose experiment results show that the breakdown voltage and the on-state resistance barely change with the accumulated dose.However,the relationships between the threshold voltages of the samples and the accumulated dose are more complex,and not only positively drift,but also negatively drift.At the end of the total dose experiment,we select the group of samples which have the smaller threshold voltage shift to carry out the single event effect studies.We find that the samples with appropriate thickness ratio SiO2-Si3N4 films have a good radiation-hardening ability.This method may be useful in solving both the SEGR and the total dose problems with the composite SiO2-Si3N4 films. 展开更多
关键词 power VDMOS device total dose effects single event effects composite SiO2-Si3N4 films
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The Effect of SiO_2 Additive on Super-hydrophilic Property of TiO_2-SiO_2 Thin Film by Sol-gel Method 认领 引用 被引量：4
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作者 陈文梅 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2001年第3期30-33,共4页
TiO2-SiO2 thin films have been prepared on slide glass substrates by sol-gel method, and the effect of SiO2 additive on photo-generated hydrophilicity of TiO2 thin film was investigated by measuring the contact angle ... TiO2-SiO2 thin films have been prepared on slide glass substrates by sol-gel method, and the effect of SiO2 additive on photo-generated hydrophilicity of TiO2 thin film was investigated by measuring the contact angle of water, the microstructure, the transmittance, the photocatalytic activity and the specific surface area . The results showed that 10mol% of SiO2 additive was the most effective for decreasing contact angle of water. The SiO2 additive of less than 30mol% has a suppressive effect on the crystal growth of anatase in calcinations, resulting in a large surface area. Consequently, the super-hydrophilicity was improved. 展开更多
关键词 sol-gel TiO2-SiO2 thin films super- hydrophilicity photocatalysis BET
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Preparation and Characterization of Three-dimensional Photocatalyst——TiO_2 Particulate Film Immobilized on Activated Carbon Fibers 认领 引用 被引量：1
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作者 傅平丰 栾勇 +2 位作者 戴学刚 张建强 张安华 《过程工程学报》 EI CAS 北大核心 2006年第3期482-486,共5页
A novel three-dimensional photocatalyst, TiO2 particulate film immobilized on activated carbon fibers （TiOE/ACFs）, was prepared by liquid phase deposition. The photocatalyst was characterized by SEM, XRD, BET surfac... A novel three-dimensional photocatalyst, TiO2 particulate film immobilized on activated carbon fibers （TiOE/ACFs）, was prepared by liquid phase deposition. The photocatalyst was characterized by SEM, XRD, BET surface area and photodegradation of methylene blue solution. TiO2 particulate film, with a thickness of nearly 200 nm and grain sizes of 30-50 nm, was deposited on almost each carbon fiber. The inner space between adjacent fibers remained as unmodified ACFs, therefore, both UV illumination and polluted solutions were allowed to pass through the felt-form photocatalyst to form a three-dimensional environment for photocatalytic reactions. With BET surface areas of 400-600 m^2/g, the TiOE/ACFs exhibited an enhanced adsorption of pollutants for photocatalysis. Comparative degradations indicated that photocatalytic activity of the TiOE/ACFs was slightly higher than that of Degussa P-25 TiO2. Two special properties, the three-dimensional structure and combined effects of ACFs＇ adsorption and titania＇s photodegradation, made contribution to high photocatalytic activity. Additionally, the TiOE/ACFs exhibited high stability and potentially application for practical usage. 展开更多
关键词 liquid phase deposition TiO2 particulate film activated carbon fibers three-dimensional structure photocatalytic activity
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Characterization of Sol-gel-derived TiO_2 and TiO_2-SiO_2 Films for Biomedical Applications 认领 引用 被引量：1
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作者 JingxiaoLIU FeiSHI DazhiYANG 《Journal of Materials Science & Technology》 SCIE EI CAS 2004年第5期550-554,共5页
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 c... 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. 展开更多
关键词 TiO2 TiO2-SiO2 Films Sol-gel process Biocompatibility
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Hydrophilic property of SiO_2-TiO_2 overlayer films and TiO_2/SiO_2 mixing films 认领 引用 被引量：5
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作者 关凯书 徐宏 吕宝君 《中国有色金属学会会刊：英文版》 2004年第2期251-254,共4页
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 T... 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. 展开更多
关键词 亲水性 TiO2 SiO2 薄膜 溶胶-凝胶 XPS UV-VIS FTIR
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A Novel Synthesis of Two-dimensional Nanopatterned TiO2Thin Film 认领 引用 被引量：1
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作者 Ming Xian LIU Li Hua GAN Gen CHEN Zi Jie XU Zhi Xian HAO Long Wu CHEN 《Chinese Chemical Letters》 SCIE CAS 2006年第8期1085-1088,共4页
A novel two-dimensional nanopattemed TiO2 thin film has been synthesized through the interaction between cationic Gemini surfactant molecules and the prepared TiO2 colloid nanoparticles with average diameters of 8 nm ... A novel two-dimensional nanopattemed TiO2 thin film has been synthesized through the interaction between cationic Gemini surfactant molecules and the prepared TiO2 colloid nanoparticles with average diameters of 8 nm by controlling the surface pressure of the monolayer. TEM photographs from the formed Gemini-TiO2 composite monolayer confirm that the prepared TiO2 film is of a branch nanopattern. 展开更多
关键词 Two-dimensional nanopattern TiO2 thin film Gemini surfactant.
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Antireflective and Self-cleaning Properties of SiO2/TiO2 Double-Layer Films Prepared by Cost-Effective Sol-Gel Process 认领 引用
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作者 Hui Zhang Duo-wang Fan +1 位作者 Tian-zhi Yu Cheng-long Wang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2015年第6期
关键词 SiO2/TiO2 double-layer films Antireflective Self-cleaning Sol-gel process
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Crystallization Process of Superlattice-Like Sb/SiO_2 Thin Films for Phase Change Memory Application 认领 引用
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作者 Xiao-Qin Zhu Rui Zhang +4 位作者 Yi-Feng Hu Tian-Shu Lai Jian-Hao Zhang Hua Zou Zhi-Tang Song 《Chinese Physics Letters》 SCIE EI CAS CSCD 2018年第5期99-103,共5页
After compositing with SiO_2 layers, it is shown that superlattice-like Sb/SiO_2 thin films have higher crystallization temperature（~240°C）, larger crystallization activation energy（6.22 e V）, and better data... After compositing with SiO_2 layers, it is shown that superlattice-like Sb/SiO_2 thin films have higher crystallization temperature（~240°C）, larger crystallization activation energy（6.22 e V）, and better data retention ability（189°C for 10 y）. The crystallization of Sb in superlattice-like Sb/SiO_2 thin films is restrained by the multilayer interfaces. The reversible resistance transition can be achieved by an electric pulse as short as 8 ns for the Sb（3 nm）/SiO_2（7 nm）-based phase change memory cell. A lower operation power consumption of 0.09 m W and a good endurance of 3.0 × 10~6 cycles are achieved. In addition, the superlattice-like Sb（3 nm）/SiO_2（7 nm） thin film shows a low thermal conductivity of 0.13 W/（m·K）. 展开更多
关键词 Sb Crystallization Process of Superlattice-Like Sb/SiO2 Thin Films for Phase Change Memory Application SiO
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Enhanced nonlinear optical absorption of Au/SiO_2 nano-composite thin films 认领 引用
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作者 赵翠华 张波萍 尚鹏鹏 《Chinese Physics B》 SCIE EI CAS 2009年第12期5539-5543,共5页
Nano metal-particle dispersed glasses are the attractive candidates for nonlinear optical material applications. Au/SiO2 nano-composite thin films with 3 vol% to 65 vol% Au are prepared by inductively coupled plasma s... Nano metal-particle dispersed glasses are the attractive candidates for nonlinear optical material applications. Au/SiO2 nano-composite thin films with 3 vol% to 65 vol% Au are prepared by inductively coupled plasma sputtering. Au particles as perfect spheres with diameters between 10 nm and 30 nm are uniformly dispersed in the SiO2 matrix. Optical absorption peaks due to the surface plasmon resonance of Au particles are observed. The absorption property is enhanced with the increase of Au content, showing a maximum value in the films with 37 vol% Au. The absorption curves of the Au/SiO2 thin films with 3 vol% to 37 vol% Au accord well with the theoretical optical absorption spectra obtained from Mie resonance theory. Increasing Au content over 37 vol% results in the partial connection of Au particles, whereby the intensity of the absorption peak is weakened and ultimately replaced by the optical absorption of the bulk. The band gap decreases with Au content increasing from 3 vol% to 37 vol % but increases as Au content further increases. 展开更多
关键词 Au/SiO2 nano-composite film plasma sputtering optical absorption spectra
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TiO_2-SiO_2双组分膜结构与光催化性能的研究 认领 引用 被引量：25
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作者 何静 江伟辉 +2 位作者 于云 宋力昕 胡行方 《无机材料学报》 SCIE EI CAS 北大核心 2005年第3期713-719,共7页
采用溶胶-凝胶法制备了不同Si/Ti比的TiO2-SiO2双组分膜.用紫外光照射亚甲基蓝的分解实验比较薄膜的光催化性能.通过XRD、FTIR、HRTEM、FE-SEM、AFM以及UV-VS-NIR分光光度计等分析手段对薄膜的结构和光学性能进行了表征.结果表明:适量S... 采用溶胶-凝胶法制备了不同Si/Ti比的TiO2-SiO2双组分膜.用紫外光照射亚甲基蓝的分解实验比较薄膜的光催化性能.通过XRD、FTIR、HRTEM、FE-SEM、AFM以及UV-VS-NIR分光光度计等分析手段对薄膜的结构和光学性能进行了表征.结果表明:适量SiO2的引入,显著提高了TiO2薄膜的光催化活性,Si/Ti比为0.2时薄膜的光催化活性为最佳. SiO2引入TiO2薄膜后,生成了Ti-O-Si玻璃相和无定形SiO2,这两种物相聚集在TiO2 晶界周围,有效地阻止了TiO2的晶粒长大,提高了锐钛矿相向金红石相的转变温度,使复合薄膜经过500℃热处理后,只有锐钛矿相存在,有利于薄膜的光催化活性的提高. 展开更多
关键词 TiO2-SiO2薄膜 双组分 溶胶-凝胶法 光催化性能
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La/TiO_2-SiO_2薄膜的光催化性能研究 认领 引用 被引量：13
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作者 何静 江伟辉 +2 位作者 于云 宋力昕 胡行方 《无机材料学报》 SCIE EI CAS 北大核心 2006年第1期230-234,共5页
采用溶胶-凝胶法制备了不同掺杂量的La／TiO2-SiO2复合薄膜．通过XRD、 FE-SEM和AFM研究了复合薄膜的微观结构,采用紫外光照射下亚甲基蓝的分解实验比较薄膜的光催化性能．结果表明:La掺杂可显著提高TiO2-SiO2复合薄膜的光催化活性,以5... 采用溶胶-凝胶法制备了不同掺杂量的La／TiO2-SiO2复合薄膜．通过XRD、 FE-SEM和AFM研究了复合薄膜的微观结构,采用紫外光照射下亚甲基蓝的分解实验比较薄膜的光催化性能．结果表明:La掺杂可显著提高TiO2-SiO2复合薄膜的光催化活性,以5％掺杂量为最佳,其光降解率比掺杂前提高了约23％．薄膜活性提高的主要原因是La掺杂后细化了TiO2的晶粒,提高了薄膜的比表面积,使其具有更高的氧化还原电势,La2+取代Ti4+ 进入到TiO2晶格,引起晶格膨胀,这种不同价离子的取代导致TiO2粒子表面电荷分布不平衡,从而提高了光生电子-空穴的分离效率． 展开更多
关键词 TiO2-SiO2薄膜 La掺杂 溶胶-凝胶法 光催化性能
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Fe3+/TiO_2/SiO_2复合纳米微粒的合成及光催化降解NO_2^- 认领 引用 被引量：53
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作者 金华峰 李文戈 +1 位作者 向纪明 唐吉玉 《应用化学》 CAS 北大核心 2001年第8期636-639,共4页
采用溶胶 -凝胶法制备了 Ti O2 / Si O2 和不同浓度 Fe3+掺杂的 Fe3+ / Ti O2 / Si O2 复合纳米粉末 ,并利用XRD、BET、UV-vis等手段研究了 Ti O2 / Si O2 及掺铁形成的 Fe3+ / Ti O2 / Si O2 复合微粒的表面结构形态变化 ,以及对污染物... 采用溶胶 -凝胶法制备了 Ti O2 / Si O2 和不同浓度 Fe3+掺杂的 Fe3+ / Ti O2 / Si O2 复合纳米粉末 ,并利用XRD、BET、UV-vis等手段研究了 Ti O2 / Si O2 及掺铁形成的 Fe3+ / Ti O2 / Si O2 复合微粒的表面结构形态变化 ,以及对污染物 NO- 2 光催化降解的影响 .结果表明 ,Fe3+ / Ti O2 / Si O2 (ω( Fe3+ ) =1 .5 % ,m( Ti)∶ m( Si) =2∶ 1 )具有最佳活性 ,样品呈晶化度较低的锐钛矿结构 .Fe3+ 掺杂导致晶粒的增大 ,稳定性降低 ,大大提高了半导体的光催化活性 ,有利于对低浓度 NO- 2 展开更多
关键词 Fe^3+/TiO2/SiO2 TiO2/SiO2 复合微粒 光降解 NO2- 纳米粉末 催化活性 环境污染物 二氧化钛 二氧化硅 铁掺杂 亚硝酸根
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SiO_2-TiO_2/聚四氟乙烯复合材料的制备及热膨胀性能 认领 引用 被引量：29
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作者 闫翔宇 袁颖 +2 位作者 张树人 吴开拓 崔毓仁 《复合材料学报》 EI CAS CSCD 北大核心 2013年第6期108-113,共6页
为了使微波基板材料与Cu金属衬底的热膨胀性能匹配，对陶瓷/聚四氟乙烯（PTFE）微波复合基板材料的热膨胀性能进行了研究。采用湿法工艺制备了以SiO2和TiO2为填料的SiO2-TiO2/PTFE复合材料，研究了复合材料密度、填料粒度和填料体积分数... 为了使微波基板材料与Cu金属衬底的热膨胀性能匹配，对陶瓷/聚四氟乙烯（PTFE）微波复合基板材料的热膨胀性能进行了研究。采用湿法工艺制备了以SiO2和TiO2为填料的SiO2-TiO2/PTFE复合材料，研究了复合材料密度、填料粒度和填料体积分数对SiO2-TiO2/PTFE复合材料热膨胀性能的影响。结果表明，当SiO2的体积分数由0增至40%（TiO2 ：34%~26%）时，SiO2-TiO2/PTFE复合材料的线膨胀系数（CTE）由50.13×10-6 K-1减小至10.03×10-6K-1。陶瓷粉体粒径和复合材料密度减小会导致CTE减小。通过ROM、Turner和Kerner模型计算CTE发现，ROM和Kerner模型与实验数据较相符，而实验值与Turner模型预测值之间的差异随PTFE含量的升高而逐渐增大。 展开更多
关键词 复合材料 聚四氟乙烯 TiO2 SiO2 线膨胀系数
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Simulated-sunlight-activated photocatalysis of Methylene Blue using cerium-doped SiO_2/TiO_2 nanostructured fibers 认领 引用 被引量：11
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作者 Yu Liu Hongbing Yu +5 位作者 Zhenning Lv Sihui Zhan Jiangyao Yang Xinhong Peng Yixuan Ren Xiaoyan Wu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第10期1867-1875,共9页
Cerium-doped SiO2/TiO2 nanostructured fibers were fabricated by electrospinning technology. The prepared fibers were characterized by thermogravimetric analysis （TGA）, scanning electron microscopy （SEM）, X-ray dif... Cerium-doped SiO2/TiO2 nanostructured fibers were fabricated by electrospinning technology. The prepared fibers were characterized by thermogravimetric analysis （TGA）, scanning electron microscopy （SEM）, X-ray diffraction （XRD） and Fourier transform infrared spectroscopy （FT-IR）. Using the fibers as catalysts, photoeatalytic degradation of Methylene Blue （MB） aqueous solution was carded out under simulated sunlight. The 0.2% Ce doping proved to be the optimal concentration for the doping of TiO2/SiO2, compared to other Ce-doped molar concentrations. The 0.2% Ce-doped SiOdTiO2 fibers exhibited higher photocatalytic activity than industrial Degussa P25 and the samples doped with only Ce or SIO2. The reasons for improving the photocatalytic activity were also discussed. Several operational parameters were studied, which showed that the photocatalytic efficiency of MB was influenced by parameters such as the initial dye concentration, the initial pH, inorganic anions, and so on. In addition, the influences of an electron acceptor and a radical scavenger suggested that OH was the dominant photooxidant during the photocatalytic process. The reuse evaluation of the fibers indicated that their photocatalytic activity had good stability. 展开更多
关键词 photocatalysis SiO2/TiO2 cerium nanostructured fibers Methylene Blue
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Preparation of TiO_2/SiO_2 Aerogels by Non-supercritical Drying Method and Their Photocatalytic Activity for Degradation of Pyridine 认领 引用 被引量：11
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作者 甘礼华 王玉栋 +2 位作者 郝志显 徐子颉 陈龙武 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2005年第6期758-763,共6页
TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XR... TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XRD and so on. The results indicate that the BET surface area of TiO2/SiO2 aerogels calcined at 550℃ which consisted of anatase structure of TiO2 with narrow distribution pores of 5-25 nm is as high as 357.89 m2·g-1. For the photocatalytic degradation of pyridine, the catalytic activities of TiO2/SiO2 aerogels are much higher than that of TiO2 powder. The photocatalytic activity of TiO2/SiO2 aerogels calcined at 800℃ is the optimum. The higher the content of SiO2, the higher the photocatalytic activity of TiO2/SiO2 aerogels. The cost for preparation of the aerogels is greatly reduced by using non-supercritical drying method, and the aerogels are hopefully applied in the treatment of industrial waste water such as coking effluent treatment. 展开更多
关键词 TiO2/SiO2 aerogels photocatalysis pyridine degradation
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Characterization and photoelectrochemical performance of Zn-doped TiO_2 films by sol-gel method 认领 引用 被引量：14
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作者 Li-ying QIAO Feng-yu XIE +3 位作者 Ming-hui XIE Cai-hua GONG Wei-lang WANG Jia-cheng GAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第8期2109-2116,共8页
Zn-doped TiO2 (Zn?TiO2) thin films were prepared by the sol?gel method on titanium substrates with heat treatment at different temperatures. The effects of heat treatment temperatures and Zn doping on the structure, p... Zn-doped TiO2 (Zn?TiO2) thin films were prepared by the sol?gel method on titanium substrates with heat treatment at different temperatures. The effects of heat treatment temperatures and Zn doping on the structure, photocathodic protection and photoelectrochemical properties of TiO2 thin films were investigated. It is indicated that the photoelectrical performance of the Zn?TiO2 films is enhanced with the addition of Zn element compared with the pure-TiO2 film and the largest decline by 897 mV in the electrode potential is achieved under 300 °C heat treatment. SEM?EDS analyses show that Zn element is unevenly distributed in Zn?TiO2 films; XRD patterns reveal that the grain size of Zn?TiO2 is smaller than that of pure-TiO2; FTIR results indicate that Zn - O bond forms on Zn?TiO2 surface. Ultraviolet visible absorption spectra prove that Zn?TiO2 shifts to visible light region.Mott?Shottky curves show that the flat-band potential of Zn?TiO2 is more negative and charge carrier density is bigger than that ofpure-TiO2, implying that under the synergy of the width of the space-charge layer, carrier density and flat-band potential, Zn?TiO2 with 300 °C heat treatment displays the best photocathodic protection performance. 展开更多
关键词 TiO2 films Zn-doping photocathodic protection photoelectrochemical activity sol.gel method
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