COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Xinbo Zhao,Huali Li,Weige Chen,Weijie Li,Zhiyu Han,Weihua Li
Conventional electromagnetic wave (EMW) absorbing materials often suffer from poor stability in humid and corrosive environments, limiting their real-world applications. In this work, carbon-based composites derived from Ti-Ni bimetallic metal-organic frameworks (MOFs) were synthesized via pyrolysis and investigated as dual-function materials for EMW absorption and corrosion protection. The composites exhibit excellent impedance matching and strong attenuation capability due to the synergistic interaction between the metal oxides and the carbon matrix. A minimum reflection loss of −40 dB and an effective absorption bandwidth of 4.61 GHz were achieved at an optimized thickness of 4.1 mm. Furthermore, upon incorporation into an epoxy resin coating, the composite displayed outstanding corrosion resistance. After immersion in a 3.5 wt% NaCl solution for 7 days, good stability was still maintained. This study presents a promising strategy for designing multifunctional materials with integrated EMW absorption and corrosion resistance, offering broad application potential in marine, aerospace, and communication sectors.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Yuanmei Xu,Wenbing Chen,Xueshi Li
Much attention has been focused on the fabrication of TiO 2 microspheres due to their excellent properties and attractive potential in many fields. Here, undoped 3D hierarchical TiO 2 microspheres (TMS) were synthesized in situ on Ti mesh using a hydrothermal method by varying NaOH concentration, reaction time and temperature. The 3D TMS grown along the surface of the woven wires of the Ti meshes, using the metal Ti meshes as a substrate, which resulted in improved conductivity. Meanwhile, the original Ti mesh with the macroporosity (due to the 15 % open area of the mesh) can act as fast proton mass diffusion. As a result, the flexible TMS-Ti photoelectrodes exhibit an excellent current density of 1.63 mA/cm 2 at a potential of 1.23 V (vs Ag/AgCl). Therefore, the in situ synthesis of TiO 2 microspheres on Ti mesh is highly desirable for flexible devices.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 15
·1-17
·
IF 2.8
Wang Renjie,Hu Mengmeng,Zhu Yifan,Jin Xiaxue,Ge Siying,Cai Runjing,Wang Tongliang,Cheng Qiaohuan,Ran Huijuan,Peng Fei
Dopamine is a critical neurotransmitter, and its dysfunction is strongly linked to various neurological disorders, including Parkinson’s disease, depression, and schizophrenia. Current detection techniques exhibit limitations in clinical applications; therefore, developing a method with high sensitivity and rapid response for dopamine detection holds significant importance. In this study, poly(3,4-ethylenedioxythiophene) (PEDOT) was synthesized via the solvent method, and a novel electrochemical sensor was constructed by integrating titanium metal–organic framework (Ti-MOF) with PEDOT through an in-situ synthesis strategy. This sensor combines the REDOX properties of Ti-MOF with the high conductivity of PEDOT, demonstrating exceptional sensitivity toward dopamine. The linear detection range spans from 8 to 400 μM, with a detection limit of 3.815 μM. In the presence of ascorbic acid (AA), dopamine (DA), and uric acid (UA), the sensor exhibits remarkable selectivity for DA. Repeatability testing reveals that the relative standard deviation of the sample response current is less than 5%, indicating high data consistency. Furthermore, after one month of storage, the senso’s response to DA decreases by only 12%, reflecting excellent reproducibility. Additionally, this study provides an in-depth analysis of the sensor’s REDOX mechanism, offering theoretical support for its optimization and practical application. The successful development of this sensor introduces an innovative, efficient, and highly sensitive approach for dopamine detection, thereby expanding the application scope of Ti-MOF in the field of electrochemical sensing.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Canglong Li,Xuechi Lu,Xinshuai Niu,Boyuan Zou,Yao Zhao,Xuanjie Li,Yang Lu,Yongsong Luo
The magnetic refrigeration is achieved through the magnetocaloric effect of a magnetic system, which is considered a promising technology for achieving the required low temperatures in industry, daily life, and scientific research. This work experimentally investigates the magnetic behavior and magnetocaloric performance of Ho 2 CoMn 1- x Ti x O 6 (0 ≤ x ≤ 1) double perovskites. The experimental results reveal that a paramagnetic →ferromagnetic transition characterized by a sharp increase in magnetization is suppressed due to decoupling action of Ti 4+ with 3 d 0 spin configuration. As a result, the transition temperature T C reduces monotonically from 75 K at x = 0–37 K at x = 0.6, and no obvious ferromagnetic transition is identified at x = 0.8–1 due to the lack of Co 2+ –Mn 4+ interactions at so high Ti 4+ substitution concentration. In addition, the magnetocaloric effect is investigated by measuring the isothermal initial magnetization from 4 K to a temperature far above T C . The maximum magnetic entropy ( − Δ S M max ) under Δ H = 6 T does not exhibit significant variation from x = 0 (11.1 J kg −1 K −1 ) to 0.6 (11.5 J kg −1 K −1 ), while it increases noticeably from x = 0.8 (13.9 J kg −1 K −1 ) to 1 (17.2 J kg −1 K −1 ). The present work indicates that the cryogenic magnetocaloric effect can be improved by dilution effect of nonmagnetic ions.
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Materials
·
2025
·Vol. 18
·期 6
·1343
·
IF 3.2
Hangmin Xu,Hao Song,Xiaozhi Wang,Xingwang Zhu
The substantial release of industrial carbon dioxide has been identified as a key factor in the development of various environmental issues. In addressing these concerns, the utilization of photocatalytic technology for carbon reduction has garnered significant attention. The disadvantage of CO2photoreduction is the problem of product yield and selectivity. It is known that MIL-125(Ti) with a high specific surface area (SBET) possesses more active sites using Ti as a node. The calcination of MIL-125(Ti) in a reducing atmosphere has been shown to introduce oxygen vacancies (OV), thereby enhancing the material’s surface and internal pores. This process has been demonstrated to result in a significant increase in the SBETand an enhancement of the Ti3+/Ti4+ratio. The increased Ti3+centers have been found to improve the material’s reducing properties. The results demonstrate that the OV-rich MIL-125-2H material exhibits the high-performance and highly selective photoreduction in CO2.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xianghan Cheng,Zhongmin Liu,Ruilin Wang,Yajun Guo,Wenyuan Han,Yong-Zheng Zhang,Da-Shuai Zhang,Xiuling Zhang,Suijun Liu,Longlong Geng
Regulating the separation and transport capabilities of the photocarriers is an important strategy to enhance corresponding activity of photocatalysts. In this work, novel Ti-MOF/Ti 3 C 2 heterojunction with face-to-face intimate contact was design and synthesized through a hydrothermal assemble route. The negatively charged Ti 3 C 2 not only facile the absorb of Ti nodes but also offer rich nucleation sites for the in-situ growth Ti-MOF. Under visible light irradiation, the optimized TM-0.05 exhibited exceptional photocatalytic activity and reusability during tetracycline photocatalytic degradation process. The rate constant reaches 1.83 × 10 −2 min −1 over TM-0.05, which was 5.3 times and 2.3 times higher than that of sole Ti-MOF and Ti 3 C 2 , respectively. Combined photoelectric characterization confirmed the improved photocatalytic activity was predominantly due to the excellent conductivity of Ti 3 C 2 and the tight interface connection between the two semiconductors, thus accelerating the interfacial charge separation and transport. Scavenger experiments, EPR, and LC-MS analysis confirmed the key role of •O 2 - , •OH and photogenerated holes during tetracycline degradation, and finally a possible mechanism was postulated. This work provides a new approach for constructing MOF/MXene structures via in situ self-assembly strategy, and expand their application in refractory pollutants photocatalytic degradation process.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Wucan Liu,Junxing Wang,Xiang Sun,Ming Cheng,Jiamin Jin,Dang-Guo Cheng,Fengqiu Chen
Vinylidene fluoride (VDF) is a fundamental fluorinated olefin in the fluorochemical industry, and innovation in its production holds significant importance for sustainable development. Traditional routes involving the dehydrohalogenation or dehalogenation of halogenated alkanes suffer from issues such as substantial waste emissions and severe equipment corrosion. The one-step catalytic dehydrogenation of 1,1-difluoroethane (HFC-152a) to produce VDF offers notable advantages. To accomplish this goal, this work innovatively aims to construct an oxidative dehydrogenation system with a highly dispersed Mo/Ti catalyst for HFC-152a. Through systematic characterization techniques, such as XPS, XRD, Raman spectroscopy, and TPD, the reaction mechanism is thoroughly investigated. These results prove that more abundant O2– species are related to improved activity, achieving 21.1% VDF selectivity and modest stability for at least 20 h.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·Vol. 12
·期 2
·112109
·
IF 7.4
Nguyen Tien Hoang
In this study, a novel Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La (denoted as SnO 2 -Sb@Ni-La(H)) was successfully prepared by hydrothermal method . The fabricated SnO 2 -Sb@Ni-La(H) electrode exhibited the superior electrocatalytic properties: high oxygen evolution potential (2.34 V vs. SCE), low charge transfer resistance (73.4 Ω cm −2 ), and highest degradation efficiency of benzoic acid (BA) ( k BA = 0.112 min −1 ), compared with other electrodes. The degradation rate of BA on the SnO 2 -Sb@Ni-La(H) was 3.6-fold, 4.7-fold, and 7-fold higher than that of SnO 2 -Sb@Ni-La(T), Ti/TiO 2 Blue, and Ti/SnO 2 -Sb, respectively. The study showed that •OH was the main radical contributing to pollutants degradation and the first-order degradation rate of organic pollutants in electrochemical oxidation (EO) process depends on their reactivity towards •OH ( k •OH,OP ), except for the case of methyl orange (MeO). Among the proposed combination methods, the combination of adsorption and electrochemical oxidation (rGO + EO process) exhibited excellent performance: the first-order degradation rate of P-nitrosodimethylaniline ( k RNO ) in (rGO + EO) process increased by 1.42-fold, compared with the EO process alone. This can be explained by the synergy effect from adsorption of RNO on rGO and the degradation of RNO during the EO process. The hydrothermal deposition combined with thermal decomposition can significantly improve the physical and electrochemical oxidation properties of the Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode: k RNO increased by 3.5-fold, compared with that of 1-time deposition by hydrothermal deposition. In addition, the effect of some operating parameters was investigated, including pH, current density, cathode size and distance of electrodes. This study provided a new method to prepare high-performance Ti/TiO 2 Blue/SnO 2 -Sb@Ni-La electrode and proposed some methods to improve the removal efficiency of the pollutants.
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CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yanhong Gu,Jianguo Zhao,Weiying Zhang,Haiwu Zheng,Laimei Liu,Wanping Chen
Sm and Ti co-doped BiFeO 3 (BFO) ceramics with Fe vacancies—Bi 0.86 Sm 0.14 FeO 3 , Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 , and Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 —were prepared by a solid-state method using a rapid liquid process. X-ray diffraction indicated that all samples exhibited a rhombohedral structure with a minor secondary phase. The structural transformation from a rhombohedral (space group: R 3 c ) to orthorhombic structure (space group: Pnma ) was observed in the sample of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , which was also confirmed by Raman scattering spectra. Microstructural investigations with scanning electron microscopy showed a reduction in grain size with doping of BFO. The dielectric loss of Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 reaches 0.05 (at 100 Hz) owing to the introduction of Ti and Fe vacancies. Ferroelectromagnetic measurements revealed the existence of ferroelectricity with a remanent polarization of 0.24 µC/cm 2 in Bi 0.86 Sm 0.14 FeO 3 , paraelectricity in Bi 0.86 Sm 0.14 Fe 0.9 Ti 0.05 O 3 , and weak ferromagnetism with a remanent magnetization of 0.2 emu/g in Bi 0.86 Sm 0.14 Fe 0.99 Ti 0.01 O 3 . The two composition-driven phases exist simultaneously and the different coercive field might be related to the jumps in the ferromagnetic hysteresis loops. Both the ferroelectric and magnetic properties were shown to correlate with the composition-driven structural evolution.
研究领域:
材料科学
·
物理学
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Materials Research Express
·
2019
·Vol. 6
·期 8
·086472
·
IF 1.449
Zhengjun Shen,Yannan Zhang,Xiaohua Yu
The interfacial microstructure of an Al-based coating on a Ti alloy surface has been designed by using phase diagrams and advanced first-principles calculations. Samples were characterized by x-ray diffractometry, scanning electron microscopy, optical microscopy, high resolution transmission electron microscopy and energy-dispersive spectrometry. The results show that the stability sequence of the Ti–Al intermetallics was Ti3Al > TiAl > TiAl2 > TiAl3. The TiAl3 transition layer with a strong self-healing property was obtained easily by metallurgical reaction of Al and Ti. The Al atoms in TiAl3 combined rapidly with the O atoms to form a new Al2O3 protective layer in air. This work provides theoretical support for the thermal processing of Ti alloys.
研究领域:
材料科学
·
表面工程
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 10
·1-9
·
IF 2.584
Meng Ke,Li Wenhua,Tang Xingui,Guo Xiaobin,Liu Qiuxiang,Jiang Yanping
Ferroelectric materials with the typical perovskite structure are widely used in capacitors, ultrasonic devices, oil drilling, transducers, and other fields. Lead-lanthanum-zirconium-titanate ceramics co-doped with Sn and Ba , have been widely investigated. However, there is little attention has been focused on the dielectric properties of barium-lanthanum-zirconium-titanate. Thus, in this work, Sn doped Ba 0.955 La 0.03 Zr 0.02 Ti 0.98 O 3 ferroelectric ceramics were prepared via a classical high-temperature solid state reaction. Scanning Electron Microscopy (SEM) was used to observe the surface appearance of ceramics. The X-ray diffraction (XRD) patterns at room temperature, indicate that the ceramics are well crystallized. Impedance properties and dielectric properties reflect the characteristic of typical high temperature dielectric relaxation behavior. The conductive activation energy and the relaxation activation energy are obtained through the calculation of the Arrhenius law. The fitting results show that the dielectric relaxation behavior at high-temperature, was related to the oxygen defect. The electrical modulus verified the partial short-range carrier migration, also contribute to the high-temperature dielectric properties.
研究领域:
材料科学
·
固态物理
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 22
·36739-36745
·
IF 5.6
Peilin Qing,Ning Guan,Yang Yang,Huizi Qiu,Weishuang Fang,Huaicheng Xiang,Ying Tang,Jie Li,Liang Fang
Crystal structure refinement and Raman spectroscopy were performed on Ca 3 M 2 Ga 2 GeO 12 (M = Ti, Sn, Zr) garnet-structured ceramics to explore the relationships between crystal structure, phonon modes, and microwave dielectric properties . The Ca 3 Ti 2 Ga 2 GeO 12 , Ca 3 Sn 2 Ga 2 GeO 12 , and Ca 3 Zr 2 Ga 2 GeO 12 ceramics were obtained by sintering at 1325–1475 °C for 6 h, and good microwave dielectric properties were achieved: ε r = 15.04, 9.53, and 11.89; Q × f = 59,515 GHz, 49,355 GHz, and 45,587 GHz; and τ f = −47.3 ppm/°C, −52.3 ppm/°C, and −43.0 ppm/°C, respectively. M 4+ (M = Ti, Sn, Zr) cations entirely occupied the octahedral site, leading to an average underbonding between cations and anions, a weak rattling effect, and measured ε r values deviating from theoretical values. The packing fraction and Raman FWHM (A 1g mode) correlated highly with the Q × f values. The negative τ f values were derived from the large positive temperature coefficient of permittivity ( τ ε ) and the temperature coefficient of ionic polarizability ( τ αm ).
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