JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Quan Zhou,Wen-Wen Wu,Yue-Chan Song,Zhuo Wang,Chao Yuan,Lu-Lu Han,Jin-Qiu Liu,Yang Yang,Peng Liu
Boron nitride nanosheets (BNNS) were mixed with rutile TiO 2 and (Al, Nb)-codoped ceramics (ANTO) powders by heteroaggregation method. Homogeneous ceramics with the single phase of rutile TiO 2 were obtained by subsequent solid-state sintering. Scanning transmission electron microscope (STEM) and X-ray photoelectron spectrometer (XPS) results show that N was doped into the crystal lattice during sintering. It is shown that the strong electron localization of the covalent N i –O bond formed between interstitial N ( N i ) and adjacent O atom shifts the cutoff frequency of high permittivity from ∼100 kHz to 100 MHz in both rutile TiO 2 and the ANTO systems. Particularly, the ANTO-0.6BNNS sample exhibits optimum dielectric properties with a permittivity of 1.3 × 10 4 and tan δ of 0.04 measured at 1 MHz. Meanwhile, the colossal permittivity of ANTO-0.6BNNS with tan δ < 0.1 shows good temperature stability in the temperature range of 200–400 K.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jing Wang,Mingying Yu,Cheng Yang
Colloidal inorganic nanoparticles featured with ultrasmall sizes and near-neutral surface wettability are considered as efficient emulsifiers to stabilize Pickering emulsions . Herein, we demonstrated that colloidal TiO 2 nanoparticles synthesized by the well-established sol-gel approach using Ti(OC 4 H 9 ) 4 as precursor, could be directly used as an efficient Pickering emulsifier without any other additives. The sol-gel TiO 2 nanoparticles showed near-neutral wettability at the oil-water interface (θ ow ˜90°) derived from the surface residual butanol-related species as revealed by TGA/DTA and FT-IR analyses, which should be responsible for the formation of Pickering emulsion with ultrahigh stability. The Pickering emulsions stabilized by size-tunable TiO 2 nanoparticles under various emulsification conditions were characterized by photography, optical microscopy and rheology measurements. The results suggested that the droplet sizes and rheology properties of the emulsion could be adjusted by tuning the TiO 2 nanoparticle sizes. Moreover, as a potential application, we also demonstrated the simple fabrication of TiO 2 -coated silicone elastic hybrid microspheres through the Pickering emulsion templated polymerization. The present work demonstrated that sol-gel TiO 2 nanoparticles could serve as efficient particle emulsifiers for achieving stable emulsions, and may also extend the wide application of colloidal TiO 2 nanoparticles based on the Pickering emulsion platforms.
研究领域:
材料科学
·
化学工程
·
界面科学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Shixiang Zhou,Li Yao,Hui Mei,Mingyang Lu,Laifei Cheng,Litong Zhang
As the operation reliability for gas sensors under complex environments is in increasing demand, the stability and safety performance are significant besides qualified gas sensing properties. In this work, structural-strengthened and self-protective ammonia sensing micro-tunnels were constructed by 3D printing . Modified methyl-silsesquioxane (MK) resin was employed as the feedstock to build the SiOC honeycomb structures . Polypyrrole (PPy) nanoparticle decorated TiO 2 arrays sensitized the structures to form inner gas-sensitive tunnels . The sensing structure exhibited high selectivity toward ammonia at room temperature. Response to 50 ppm NH 3 was 18.67%, while the response and recovery times were 119 and 86 s, respectively. The excellent long-term stability also ensured reliable operation in complex environments. More importantly, the enhanced honeycomb had an outstanding mechanical performance with the compressive strength , Young's modulus , and energy absorption of 33.72 MPa, 2.40 GPa, and 28.22 kJ/m 3 , respectively. It can serve as a load-bearing part of the fundamental component to avoid catastrophic collapse while maintaining a regular sensing capability under pressure loading as the excellent deformation resistance ensured the integrity and connection of the sensing layer. Moreover, the inner through-holes facilitated the exposure of the sensing tunnels to the atmosphere, which can detect target gas simultaneously without the embedding of extra sensors. Thus, the construction of self-protective gas sensing structures was promising to be an efficient strategy for reliable gas detection in extreme environments.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Mathankumar Ganesan,Jin Li,Tongheng Cheng,Fei Wang
Pyrochlore-based metal oxide nanocomposites offer an attractive pathway for developing next-generation gas sensors by exploiting interfacial charge transfer and band engineering. Here, we report for the first time the use of Ce 2 Sn 2 O 7 /TiO 2 nanocomposites for ultra-trace NH 3 detection at room temperature. The materials are synthesized via a facile hydrothermal route and systematically evaluated against common volatile organic compounds, including ethanol, acetone, methanol, n-butanol, isopropanol, and triethanolamine. The Ce 2 Sn 2 O 7 /TiO 2 heterojunction demonstrated outstanding selectivity toward NH 3 , with the optimized CeTi2 sensor delivering an ultrahigh response of 83.8% to 100 ppm, a rapid response time of 12 and 5 s, and an exceptionally low detection limit of 2 ppb under ambient conditions (25°C). At 100°C, the prepared CeTi2 sensor displays a gas sensing response of 82.1% towards 100 ppm of NH 3 . Beyond sensitivity, the device exhibited excellent repeatability and long-term stability, and ensured reliable operation under realistic environments. Mechanistic analysis revealed that the Ce 2 Sn 2 O 7 /TiO 2 interface induces strong surface band bending and remarkably accelerates charge transport and reversible adsorption–desorption dynamics. This work establishes Ce 2 Sn 2 O 7 /TiO 2 as a pioneering platform for ppt-level NH 3 detection, offering a powerful combination of selectivity, stability, and energy-efficient operation for environmental monitoring and industrial safety.
研究领域:
材料科学
·
气体传感技术
·
纳米材料
·
环境监测
·
微机电系统（MEMS）
✓ 已验证
产品关联
DOI
高影响因子
CHEMICO-BIOLOGICAL INTERACTIONS
·
2014
·
IF 2.982
Hong-Mei Zhang,Jian Cao,Bo-Ping Tang,Yan-Qing Wang
TiO 2 nanoparticles are the most widely used metal oxide nanoparticles and have oxidative toxicity. Catalase is an important antioxidant enzyme . Here the understanding of an effect of TiO 2 nanoparticles on the activity and structure of catalase is crucial to characterize the toxicity of TiO 2 nanoparticles. These experimental data revealed that TiO 2 nanoparticles could bind to catalase by the electrostatic and hydrogen bonding forces. On binding TiO 2 nanoparticles, catalase got destabilized with the decrease of α-helices content, the solvent polarity of environment around the fluorescence chromophores on catalase were also affected. In addition, TiO 2 nanoparticles also affected the activity of catalase. TiO 2 nanoparticles acted as an activator of catalase activity at a low molar concentration and as an inhibitor at a higher molar concentration. With regard to human health, the present study could provide a better understanding of the potential nanotoxicity of TiO 2 nanoparticles.
研究领域:
纳米毒理学
·
生物化学
·
环境健康
·
酶学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2021
·Vol. 6
·期 31
·7880-7886
·
IF 2.109
Hongxia Li,Jie Wu,Xiang Gao,Tiantian Li,Mengmeng Zhang,Xiaohui Niu,Deyi Zhang,Yi Wang,Haiyan Fan,Kunjie Wang
Graphical Using graphene oxide (GO) as the substrate, GO−TiO 2 −Ag composites were prepared by in-situ growth method, and did an antibacterial activity experiment on the material. The presence of Ag nanoparticles (NPs) on the surface of GO−TiO 2 −Ag composite material greatly enhances the antibacterial activity. Ag NPs can not only destroy the outer membrane of the bacteria, but also generate Reactive Oxygen Species (ROS), thus causing damage to the bacteria. A composite of graphene oxide (GO) and titanium (IV) oxide was prepared through a hydrothermal treatment by mixing TiO 2 with GO. The GO was obtained by using an improved Hummers’ method. The composite (TiO 2 -GO) only indicated a weak antibacterial effect against Escherichia coli under dark conditions. Upon introduction of silver-based nanomaterials, two new composites viz. GO−TiO 2 −Ag and GO−TiO 2 −Ag 2 S were prepared also through hydrothermal reaction. While both composites exhibit stronger antibacterial activities against E. coli than TiO 2 -GO in dark, GO−TiO 2 −Ag composite exhibited higher bactericidal rate (92 %) than GO−TiO 2 −Ag 2 S (40 %).
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 12
·6290-6298
·
IF 3.784
Xi-xi Sun,Gang Liu,Ruichen Li,Yan Meng,Jiagang Wu
An investigation into photocatalysts mainly focuses on inorganic powders, and their fixation, recycle, and repair in an open and flowing environment remains a problem. Herein, the photocatalytic property of polyvinylidene fluoride (PVDF) is utilized to solve this problem. It can be facilely recycled and repaired because of the form of membrane, and porous structure ensures its sufficient contact with pollutants. In addition, its photocatalytic activity can be effectively modified by compositing TiO 2 nanopowder, which performs better photocatalytic activity than equivalent content TiO 2 powder, originated from the enhanced separation efficiency of electron and hole resulting from the extra driving force maybe generated by PVDF's ferroelectric spontaneous polarization and heterojunction structure, which reduces the recombination of charge carriers. In addition, the pore structure with large density and small size provides more reaction area for the composite structure, which also benefits for the enhancement of photocatalytic activities. Tight combination between PVDF and TiO 2 guarantees the stable activity of the composites under flowing environment, and so PVDF/TiO 2 composite can sustain its initial photocatalytic activity after at least 10 times cycles. More importantly, when the membrane is damaged, it can be easily repaired by the cost of a small quantity of solvent and can maintain its initial photocatalytic activity. This work would promote the understanding of physical mechanisms of enhanced photocatalytic activities, and recycle and repair properties in PVDF- x TiO 2 composites.
研究领域:
材料科学
·
环境工程
·
光催化
·
聚合物复合材料
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Hailong Li,Jiexia Zhao,Weilin Zhang,Jianping Yang,Jun Wang,Mingguang Zhang,Zequn Yang,Liqing Li,Kaimin Shih
Manganese oxide/titanium dioxide (MnO x /TiO 2 , or MnTi) catalyst prepared by an ultrasound-assisted impregnation method was employed for simultaneous nitrogen oxide (NO) reduction and elemental mercury (Hg 0 ) oxidation under a simulated selective catalytic reduction (SCR) atmosphere. An NO reduction rate of 83% and Hg 0 oxidation rate of 96% were simultaneously achieved at a relatively low temperature of 200 °C. Ammonia (NH 3 ) as a reducing agent in the NO-SCR process was systematically investigated for its effect on Hg 0 oxidation. The results showed that NH 3 inhibited Hg 0 oxidation over the low-temperature MnTi catalysis process. In the presence of NH 3 , competitive adsorption between NH 3 and Hg 0 on the MnTi catalyst was partly responsible for the weakening Hg 0 oxidation. NH 3 consumed surface oxygen (O 2 ) on the MnTi catalyst, which also resulted in lower Hg 0 oxidation rate, especially in the absence of gas phase O 2 in the flue gas . More importantly, oxidized mercury was reduced by NH 3 to form Hg 0 with the aid of NO, i.e., the combined presence of NO and NH 3 induced the reduction of oxidized mercury, and hence partially offset Hg 0 oxidation. The effects of individual SCR gases, such as O 2 , NO, and the combinations, on Hg 0 oxidation were also elaborated.
研究领域:
环境科学
·
催化化学
·
大气污染控制
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 18
·11938-11947
·
IF 3.9
Yu Liang,Wanrui Gui,Zhihong Yang,Kang Cheng,Xin Zhou,Can Yang,Jianmei Xu,Wei Zhou
Designing organic–inorganic hybrid semiconductors is an effective strategy for improving the performance of the photocatalyst under visible light irradiation. In this experiment, we firstly introduced Cu into perylenediimide supramolecules (PDIsm) to prepare the novel Cu-dopped PDIsm (CuPDIsm) with one-dimensional structure and then incorporated CuPDIsm with TiO2 to improve the photocatalytic performance. The introduction of Cu in PDIsm increases both the visible light adsorption and specific surface areas. Cu2+ coordination link between adjacent perylenediimide (PDI) moleculars and H-type π–π stacking of the aromatic core greatly accelerate the electron transfer in CuPDIsm system. Moreover, the photo-induced electrons generated by CuPDIsm migrate to TiO2 nanoparticles through hydrogen bond and electronic coupling at the TiO2/CuPDIsm heterojunction, which further accelerates the electron transfer and the separation efficiency of the charge carriers. So, the TiO2/CuPDIsm composites exhibit excellent photodegradation activity under visible light irradiation, reaching the maximum values of 89.87 and 97.26% toward tetracycline and methylene blue, respectively. This study provides new prospects for the development of metal-dopping organic systems and the construction of inorganic–organic heterojunctions, which can effectively enhance the electron transfer and improve the photocatalytic performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 6
·1-9
·
IF 5.7
Zeng Yinan,Zhang Min,Peng Kefu,Man Zu,Guo Lu’an,Liu Wenping,Xie Shilei,Liu Peng,Xie Dong,Wang Shoushan,Cheng Faliang
A photoelectrochemical molecular imprinting sensor based on Au/TiO 2 nanocomposite was constructed for the detection of dibutyl phthalate. Firstly, TiO 2 nanorods were grown on fluorine-doped tin oxide substrate by hydrothermal method. Then, gold nanoparticles were electrodeposited on TiO 2 to fabricate Au/TiO 2 . Finally, molecular imprinted polymer was electropolymerized on the Au/TiO 2 surface to construct MIP/Au/TiO 2 PEC sensor for DBP. The conjugation effect of MIP accelerates the electron transfer between TiO 2 and MIP, which can greatly improve the photoelectric conversion efficiency and sensitivity of the sensor. In addition, MIP can also provide sites for highly selective recognition of dibutyl phthalate molecules. Under optimal experimental conditions, the prepared photoelectrochemical sensor was used for the quantitative determination of DBP and the results showed a wide linear range (50 to 500 nM), a low limit of detection (0.698 nM), and good selectivity. The sensor was used in a study of real water samples to show that it has promising applications in environmental analysis. Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Ao Jiang,Yuli Di,Shanhua Chen,Dafu Zhang,Xingyu Chen,Zhengdong Zhang,Xinyi Zhang,Qi Dong
The sol-gel method was used to prepare a series of muscovite/TiO 2 heterostructures for photocathodic protection of 304 stainless steels (304SS). The effects of different mass ratio of muscovite to TiO 2 (1:0.5, 1:1 and 1:1.5, denoted as MT-0.5, MT-1 and MT-1.5, respectively) on the crystal phase, grain size, light absorption properties and photoelectrochemical properties of TiO 2 and muscovite/TiO 2 heterostructures were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–visible diffuse reflection spectroscopy (UV–vis DRS). The corrosion resistances and photoelectrochemical properties of the 304SS coated with muscovite/TiO 2 heterostructures (304SS/MT) were studied through corrosion immersion test and electrochemical workstation in 3.5 wt% NaCl solution, respectively. In addition, Tafel curves and the electrochemical impedance spectroscopy (EIS) measurements were carried out to evaluate the photogenerated electron separation and transfer efficiency, and the interfacial charge transfer resistance of the 304SS and 304SS/MT electrodes, respectively. The time-dependent photocurrent responses of the MT-1 heterostructures demonstrated an enhanced photo-generated cathodic protection performance for 304SS substrates under visible light irradiation compared to TiO 2 . A photoinduced potential drop value for 304SS coated with MT-1 in 3.5 wt% NaCl solution was −0.54 V (vs. SCE). After immersion test, the corrosion image analyses of the 304SS, 304SS-MT, and 304SS coated with physically mixed muscovite/TiO 2 samples showed that the 304SS/MT-1 exhibits the best corrosion resistances . After connecting with 304SS/MT-1 in 3.5 wt% NaCl solution, the corrosion current densities ( i corr ) of 304SS increased significantly under the white light illumination, indicating more photoinduced electrons were migrated from the muscovite/TiO 2 heterostructures to the 304SS compared with that from pure TiO 2 . Furthermore, the simulated charge transfer resistance ( R ct ) of 304SS/MT-1 electrode is smaller than that of the 304SS electrode coated with TiO 2 , indicating that there exists an effective separation of the photogenerated electrons and holes, and a fast interfacial charge transfer after coating muscovite/TiO 2 heterostructures.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 18
·7571-7582
·
IF 4.5
Yang Yang,Lu Jie,Ma Zhichun,Zhao Yi,Wang Shuang,Ge Kai,Yang Yongfang
Two dimensional (2D) CuTCPP/B–TiO 2 composites were successfully synthesized by addition of B–TiO 2 NPs into the system for preparation of 2D CuTCPP nanosheets under hydrothermal condition. 2D CuTCPP nanosheets with large specific surface area can not only act as supportor to decrease the aggregation of B–TiO 2 and improve the adsorption capacity of methylene blue (MB) but also provide more transfer pathway to effectively facilitate interfacial charge transfer and separation of photogenerated electrons and holes, thus leading to a superior efficiency for photodegradation of MB. The photocatalytic degradation rate constant of 2D CuTCPP/B–TiO 2 composites is 0.0486 min −1 , which is about 15.2, 5.92 and 4.23 times that of P25 (k = 0.0032 min −1 ), 2D CuTCPP nanosheets ((k = 0.0082 min −1 ) and B–TiO 2 NPs (k = 0.0115 min −1 ). This study demonstrates that the combination of B–TiO 2 NPs and 2D CuTCPP is a viable strategy to improve the photocatalytic efficiency for degradation of MB.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）