JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 7
·118142
·
IF 6.2
Mengwen Zhang,Fanyu Meng,Na Cao,Lei Fan,Shoulei Yang
High-performance Al₂O₃-Ti(C,N) composites are critical for extreme-environment applications, yet conventional static sintering cannot simultaneously achieve full densification and strong grain-boundary bonding. Here, a dynamic sinter forging (DSF) strategy coupling sintering densification and oscillatory forging deformation was developed to activate plastic flow and defect engineering. Composites were sintered at 1600 °C with oscillatory amplitudes of 0–40 MPa (5 Hz) and a maximum pressure of 80 MPa. The flexural strength increased from 583 MPa under a pressure of 80 ± 0 MPa to 1070 MPa under 40 ± 40 MPa, representing an 83 % enhancement. TEM revealed increased dislocation densities in Al₂O₃ (2.6 ×10⁵→2.9 ×10⁶ cm⁻²) and Ti(C,N) (4.8 ×10⁶→8.2 ×10⁶ cm⁻²) and curved interfaces, shifting fracture from intergranular to transgranular, showing that defect generation and interface curvature jointly strengthen the composites. This DSF route enables concurrent densification and microstructural strengthening within a single thermal cycle, offering a general pathway to high-toughness oxide–carbonitride ceramics.
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ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Mingyi Zhang,Zenan Lin,Qingming Huang,Yadong Zhu,Hui Hu,Xiaohui Chen
In this research, a novel green mechanochemical dry gel conversion method (MDGC) is reported to obtain submicron-sized Ti-rich MWW zeolite. First, titanium and silica sources were milled under milder conditions in a planetary ball mill to construct the uniform SiO 2 -TiO 2 composite powders with higher Ti contents. Subsequently, submicron-sized Ti-rich MWW zeolite powder was prepared via dry gel conversion (DGC) route using the obtained composite under mixed steam environment consisting of water and piperidine. The physicochemical properties of the SiO 2 -TiO 2 composites before and after calcination and corresponding Ti-MWW-MDGC were investigated by XRD, UV–Vis, FT-IR, SEM, XRF, and N 2 absorption-desorption. Moreover, Ti-MWW (30)-MDGC exhibited a superior catalytic activity during epoxidation with H 2 O 2 compared with the traditional DGC method, and the conversion of 1-hexene increased from 4.2% to 26.3%. The MDGC method is a promising approach for the green production of various zeolites with higher heteroatom contents, such as TS-1, Ti-Beta and Sn-MWW, etc.
研究领域:
材料科学
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无机化学
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催化化学
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纳米材料
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绿色化学
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Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 41
·8535-8548
·
IF 7.571
Jiaxin Wu,Shaokang Jiang,Wenjia Xie,Yiyuan Xue,Mingxin Qiao,Xiangjun Yang,Xin Zhang,Qianbing Wan,Jian Wang,Junyu Chen,Xibo Pei
Biocompatibility and osteointegration of implants are highly desired in orthopedic and dentistry applications. The synthesis of a coating with ideal biocompatibility and osteogenic effect carries practical significance for improving the bio-inertness of pure Ti implants. Metal–organic frameworks (MOFs) are effective surface modification agents in bone regeneration applications. Bio-MOF-1, a classic type of biofriendly MOF with a bio-derived constitution, possesses biocompatibility and osteogenic potential resulting from its Zn core and adenine ligand. In this study, bio-MOF-1 coatings at multiple concentrations were synthesized on alkali-heat treated Ti, and their cytocompatibility and osteogenic properties were systematically examined both in vitro and in vivo. Coatings were characterized to confirm the successful synthesis of bio-MOF-1 coatings. These coatings exhibited advanced thermostability, excellent biocompatibility, and stable Zn2+ release, which up-regulated the expression of osteogenesis-related genes and proteins. Furthermore, bio-MOF-1 coating of Ti implants enhanced early osseointegration at the bone–implant interface. This study demonstrates the promising potential of bio-MOF-1 coatings with the osteogenic effect for surface modification in bone tissue engineering.
研究领域:
生物材料
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组织工程
·
骨科
·
牙科学
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高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jingxin Tian,Hongjun Zhang,Liwei Zhang,Dongliang Wang,Yong Huang,Elena Balashova,Boris Krichevtsov,Hua Ke
The effects of oxygen vacancies on electric properties of high valence ions (Mo/Zr/Ti) doped Bi 0.85 Nd 0.15 FeO 3 (marked as BNFM, BNFZ, BNFT) ceramics with morphotropic phase boundary (MPB) are investigated. MPB structures consisting of rhombohedral, intermediate and orthorhombic phases exist in all samples, which is confirmed by the XRD Rietveld refinements and TEM analyses. The BNFT has the maximum remnant polarization of 34.5 μC/cm 2 at 180 kV/cm, owing to its lowest paraelectric orthorhombic phase content. XPS and impedance results reveal that the BNFT ceramic has the relatively low oxygen vacancy contents and the largest impedance value, which is beneficial for the ferroelectric test. The best comprehensive properties of BNFT open wide prospects for improving BiFeO 3 -based ceramics.
研究领域:
材料科学
·
电子工程
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Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 4
·2231-2246
·
IF 1.843
Luo Qiuzi,Sun Yihua,Guo Jin,Zhang Jiangyu,Fang Liang
The properties of ZnO nanoparticles doped with titanium ions (Ti 4+ ) and gallium ions (Ga 3+ ) were modified by sol–gel method. Considering the ion radius of doped metal elements, the radius of Zn ions and the doping limit of ZnO, the doping rate of Ti is fixed at 1 atom%, and the optimal doping amount of Ga is discussed. The Ga/Ti co-doped ZnO nanoparticles were characterized by X-ray diffraction (XRD), ultraviolet/visible spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and infrared spectroscopy. XRD results show that Ga/Ti co-doped ZnO has hexagonal wurtzite phase structure. With the increase of Ga doping concentration, the particle size of ZnO decreases. Through photoluminescence analysis, it is found that the absorption of Ga/Ti co-doped ZnO in the visible region moves to the long wave direction. In addition, with the increase of Ga doping, the particle size of GTZ powder first decreases and then increases, the band gap also decreases and then increases. When the doping amount of Ga is 1.5 atom%, the photocatalytic activity is the best. The degradation rate of MB was 90% within 2.5 h. Ga/Ti co-doped ZnO nanoparticles have good photocatalytic properties and low cost. They are a promising catalyst for wastewater treatment.
研究领域:
材料科学
·
环境科学
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CRYSTENGCOMM
·
2023
·Vol. 25
·期 28
·4039-4047
·
IF 3.1
Guoliang Feng,Jintao Gao,Xi Lan,Yu Li,Zhancheng Guo
Vanadium (V) is often transferred into vanadium slag from the smelting of vanadium titano-magnetite ore, however, basic data for the crystallization behavior and crystal structure of V-spinel are lacking, which limits the efficient recovery of V resources from vanadium slag. In this study, the crystallization behavior of V-spinel in vanadium slag was investigated, and in situ separation of high-purity V-spinel crystals from vanadium slag was conducted via super-gravity at 1673 K. It was found that TiO2 content of 12 wt% in vanadium slag was the most conducive to the crystallization of V-spinel. On this basis, the crystal structures of various V-spinel crystals were characterized, by which the displacement mechanism of V and Ti in V-spinel was verified. Namely, V3+ in the octahedron sites was gradually replaced by Ti4+ with the increase of Ti content, while an equal amount of Fe3+ in the tetrahedron sites was replaced by Fe2+. This study provides some necessary theoretical basis for the efficient recovery of V resources in vanadium slag.
研究领域:
冶金学
·
材料科学
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 42
·16661-16669
·
IF 8.262
Shuo Li,Qidong Zhao,Dedong Meng,Dejun Wang,Tengfeng Xie
Cocatalysts are one essential factor for promoting the photoelectrochemical water oxidation efficiency of photoanodes, but the influence of interface charge transfer between the semiconductor and cocatalyst has been rarely addressed. Due to their poor charge conductivity, the application of many metal oxides as cocatalysts has been limited. In this work, using photoanode Ti/Fe2O3 and cocatalyst CoOx as a model system, we elaborately design a charge transfer channel of metal Co between the photoanode and cocatalyst. Such a ternary nanostructure has proved to possess several advantageous features, including effective charge separation efficiency, long lifetime of photogenerated holes, and fast charge transport from the photoanode to the surface of the cocatalyst. Benefiting from these desirable nanostructures, the photoanode, containing a charge transfer channel of metal Co, exhibited a remarkable photoelectrochemical performance for water oxidation, with an almost 7-fold enhancement in the photocurrent density at 1.23 V vs. RHE under visible light illumination and about a 0.15 V water oxidation onset potential negative shift compared to the Ti/Fe2O3 photoanode. These findings demonstrate that the successful construction of a metallic charge transfer channel between the photoanode and cocatalyst should be employed as a general strategy for photoconversion applications.
研究领域:
材料科学
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光电化学
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可再生能源
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纳米材料
·
催化
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Haofei Ma,Ziqi Wang,Peng Yuan,Boxiong Shen,Jie Xu
Since the yield of titanium-bearing blast furnace slag (TF) during the smelting of vanadium titanium magnetite is large, it is urgent to find ways to recycle it and implement its value-added utilization. In this study, a perovskite-rich photocatalyst was prepared by acid-washing of TF, and then Ce was doped to modify it for photocatalytic removal of gaseous toluene under the irradiation of visible light. XRD, XRF and XPS analyses demonstrated that the perovskite phase was enriched after the acid-washing, and the content of CaTiO 3 in the acid-washed slag (AS) also increased after Ce doping. The combined N 2 adsorption-desorption, UV Vis DRS, EIS, PL , and ESR analysis results indicated that the photocatalytic performance of the mentioned photocatalyst was related to the Ce dopant content. The AS doped with 20% Ce (20% Ce-AS) had a lower band gap and larger specific surface area than the others catalysts. Under visible light radiation , more active radicals were produced, and the removal efficiency of toluene reached 92.08% for 20% Ce-AS. In addition, the results of the in situ DRIFTS tests indicated that toluene was gradually degraded by the Ce-doped perovskite-type photocatalyst to alcohols and aldehydes and mineralized to H 2 O and CO 2 . This study is expected to provide a new approach for the technical development of the value-added utilization of TF coupled with the efficient removal of toluene.
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Small Methods
·
2023
·Vol. 7
·期 8
·2300054
·
IF 12.4
Lu Chen,Youbing Li,Kun Liang,Ke Chen,Mian Li,Shiyu Du,Zhifang Chai,Michael Naguib,Qing Huang
Two-dimensional (2D) transition metal carbides and/or nitrides, MXenes, are prepared by selective etching of the A-site atomically thin metal layers from their MAX phase precursors. High entropy MXenes, the most recent subfamily of MXenes, are in their infancy and have attracted great interest recently. They are currently synthesized mainly through wet chemical etching of Al-containing MAX phases, while various MAX phases with A-sites elements other than Al have not been explored. It is important to embody non-Al MAX phases as precursors for the high entropy MXenes synthesis to allow for new compositions. In this work, it is reported on the design and synthesis of Ga-containing medium/high entropy MAX phases and then their corresponding medium/high entropy MXenes. Gallium atomic layer etching is carried out using a Lewis acid molten salt (CuCl2). The as-prepared (Ti 1/4 V 1/4 Nb 1/4 Ta 1/4 ) 2 CT x exhibits a Li + specific capacity of ≈400 mAh g −1 . For (Ti 1/5 V 1/5 Nb 1/5 Ta 1/5 Mo 1/5 ) 2 CT x a specific capacity of 302 mAh g −1 is achieved after 300 cycles, and high cycling stability is observed at high current densities. This work is of great significance for expanding the family members of MXenes with tunable chemistries and structures.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Linjing Liu,Bin Yang,Rui Lv,Qiangwei Kou,Shuai Yang,Hang Xie,Yuan Sun,Yunfei Chang,Shan-Tao Zhang,Fei Li
Piezoceramics with high and fatigue-resisted piezoelectric properties are strongly desired for actuator applications. In this work, textured Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zr, Ti)O 3 ceramics with Lotgering factor F 001 ∼98% were fabricated by templated grain growth technique. Strong [001] c -grain orientation ( f ∼90% and r ∼0.22) of the textured ceramics effectively produced about 230% enhanced piezoelectric coefficient d 33 * (i.e., S max / E max ) and substantially improved unipolar electrical fatigue resistance. Unipolar polarization P max and d 33 * of the textured ceramics were nearly maintained up to 10 6 unipolar cycles, while 19% and 14% degradations were respectively observed from randomly oriented counterparts. Especially, normalized d 33 * of the textured ceramics shows better unipolar fatigue resistance than those of piezoceramics reported previously. Much lower bipolar strain asymmetry γ s (∼4%) was observed from the textured samples fatigued after 10 6 unipolar cycles as compared to γ s ∼23% for randomly oriented counterparts. While charged defect accumulation model described the serious fatigue deteriorations in randomly oriented ceramics, the current work revealed that substantially enhanced unipolar fatigue resistance of the textured ceramics is mainly associated with the inherent fatigue anisotropy, weakened local bias fields owing to both enhanced domain mobility and lower defect density near grain boundaries/interfaces, and increased intrinsic contribution due to more tetragonal content. These superior characteristics suggest the great potential of textured ceramics for high-performance and robust actuator applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Xiaoyu He,Xutao Gao,Xiao Chen,Shen Hu,Fangchang Tan,Yujie Xiong,Ran Long,Min Liu,Edmund C.M. Tse,Fei Wei,Hong Yang,Jungang Hou,Chunshan Song,Xinwen Guo
Increasing CO 2 conversion efficiency over metal-organic framework (MOF) based photocatalysts is of great significance to promote the carbon capture and utilization. In this work, a dual-benefit design strategy is deployed in the synthesis of a new two-dimensional Fe/Ti-BPDC MOF photocatalyst with atomically dispersed Fe sites. This catalyst demonstrated an excellent catalytic performance in the visible-light-driven CO 2 conversion to HCOOH, achieving a high yield of 703.9 μmol g -1 h -1 at a selectivity greater than 99.7%. This is attributed to the ‘dual-optimization’ achieved by this catalyst to sustain the supply of photogenerated electrons and to effectively activate CO 2 . Specifically, the Fe/Ti-BPDC catalyst provides a high proportion of effective photogenerated electrons for the CO 2 photocatalysis process via a unique electron transfer mechanism. Meanwhile, the strong O/Fe affinity between CO 2 and atomically dispersed Fe active sites not only enables a fast CO 2 activation, but also dictates the intermediate reaction pathways towards high HCOOH selectivity.
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CHEMOSPHERE
·
2023
·
IF 8.8
Xiangjuan Ma,Cong He,Yan Yan,Jianming Chen,Huajun Feng,Jinfei Hu,Hang Zhu,Yijing Xia
Reducing energy comsuption is crucial to commercialize electrochemical oxidation technologies . In this study, a novel PbO 2 composite electrode (Ti-foam/PbO 2 -GN) was successfully fabricated based on a porous titanium (Ti) foam substrate and a β-PbO 2 active layer embedded with multiple graphene (GN) interlayers, and applied as an anode for energy-efficient pulse electrochemical oxidation of ciprofloxacin (CIP). In contrast to PbO 2 and Ti-foam/PbO 2 electrodes, the Ti-foam/PbO 2 -GN electrode surface exhibited a more compact structure, smaller crystal grain size, and greater electrochemical active surface area. CIP removal of 89.7% was obtained with a low energy consumption (EE/O) of 6.17 kWh m −3 under pulse electrolysis conditions with a current density of 25.00 mA cm −2 , pulse frequency of 5000 Hz, and pulse duty cycle of 50.0%. Up to 70.7% of the energy was saved in the pulse current mode compared to the direct current mode. Narrowing the electrode spacing to 2 cm facilitated the mass transfer process and enhanced oxidation efficiency. According to the intermediates identified, the pulse electrolysis of CIP primarily involved hydroxylation of the quinolone ring, breaking of the piperazine ring, defluorination , and decarboxylation processes, and a possible degradation mechanism of CIP was proposed. The continuous oxidation performance of CIP and the relatively low leaching of Pb 2+ suggested that the Ti-foam/PbO 2 -GN electrode exhibited excellent stability, repeatability, and safety. The degradation results of CIP in real water also exhibits the great potential of environmental application. As a result, pulse electrochemical oxidation using a Ti-foam/PbO 2 -GN electrode has proven to be an energy-efficient and promising alternative for antibiotic wastewater treatment .
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