CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mian Yang,Kaihua Chen,Shenghui Guo,Ming Hou,Jiyun Gao,Junwen Zhou,Shuhao Shi,Li Yang
In this paper, the self-propagating reaction of the Ti–SiC–C system for synthesising Ti 3 SiC 2 -based diamond composites is ignited by the combustion of Ni–Al alloy powders in a microwave field. The heating curves of Ni–Al-assisted microwave sintering show that the self-propagating reaction could be successfully ignited after heating samples to 685.2 °C in a microwave field for 456 s. This finding indicates that ignition could occur at temperatures below the diamond graphitisation temperature (727 °C). X-ray diffraction analysis indicates that the sintered samples primarily comprise Ti 3 SiC 2 , TiC, Ti 5 Si 3 and C. Scanning electron microscopy coupled with energy dispersive spectroscopy observations demonstrates that the diamond grains are tightly bonded with the surrounding matrix and are intact. The best wear ratio of 302.26 was obtained for the Ti 3 SiC 2 -bonded diamond composite when the diamond grain size was 140/170 mesh and the molar ratio of Ti, SiC and C was 3:1.1:0.9.
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高影响因子
CARBON
·
2025
·
IF 11.6
Heng Zhang,Biao Hu,Yangmin Wu,Minglong Yan,Qinhao Zhang,Wenwu Xu,Wenjie Zhao
Metal corrosion and mechanical wear result in a serious decrease in the service life of marine engineering equipment. Carbon-based quantum dots (CDs) are often used as corrosion inhibitors or lubricants due to their ease of functionalization and quantum size effect. However, the protection efficiency of CDs is limited by weak adsorption capacity, and additional doping of heteroatoms such as N and S is usually needed to enhance the adsorption. Here, Ti 3 C 2 T x quantum dots (MQDs) were synthesized by using two-dimensional Ti 3 C 2 T x sheets containing abundant functional groups on the surface as precursors. The corrosion inhibition efficiency of MQDs with a concentration of 400 mg L −1 reached 94.2 %, and the coefficient of friction and wear rate were reduced by 67.6 % and 83.2 %, respectively, compared with the single NaCl solution. Surface analysis showed that MQDs blocked the penetration of corrosive species via forming a protective film on the steel surface through the formation of Ti–O–Fe coordination bonds. Notably, the thickness of protective film was affected by the pH of solution, reaching a maximum thickness of 215 nm at the NaCl solution with a pH of 7. Finally, density functional theory and molecular dynamics simulations were utilized to deeply reveal the adsorption mechanism of MQDs. This study provides new insights into the role of MQDs as dual-functional additives, which is of great significance in promoting the development of multifunctional marine engineering protective materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Shihui Wang,Yuzhou Xia,Guiyang Yan,Meixia Chen,Xuxu Wang,Ling Wu,Ruowen Liang
Inspired by the concept of frustrated Lewis pairs (FLPs) from homogeneous catalysis, an organic supramolecular bridged metal-organic frameworks (MOFs) heterojunction, i.e., a perylene-3,4,9,10-tetracarboxylic diimide@MIL-125(Ti)-NH 2 (denoted PDI@MTi) composite is successfully fabricated via a two-step synthesis method. Experimental characterisations and theoretical calculations reveal that in the obtained “TiO 5−x -ligand-PDI” FLPs, the unsaturated Ti-O clusters function as a Lewis acid to accept photogenerated electrons, and the PDI sites act as a Lewis base to capture photogenerated holes. With the unique structure characteristics, the PDI@MTi shows excellent photocatalytic activity toward the disinfection of Staphylococcus aureus and Cr(VI) reduction, with 1.0- and 10.3-fold enhancements, respectively, compared with unadorned MTi. The synergic effects of the micro polarisation field, multiple active sites, and a C-N bonded interface contributed to photoactivity enhancement. This work demonstrates the potential of using MTi as a platform for constructing FLPs-containing heterogeneous photocatalysts and provides new strategies to control carrier separation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Syed Jalil Shah,Wenyuan Li,Ying Tang,Yang Hu,Shanliang Jiang,Hui He,Ruimeng Wang,Zhongxing Zhao,Zhenxia Zhao
Fabrication of broad-spectrum response photocatalysts in a controllable manner that can efficiently utilize solar light as much as possible remains a top priority target yet a challenging task. In this work, a facile approach of synchronous bottom-up growth was employed to construct UCNP/NMIL(Ti) nanohybrids via NH 2 -BDC (NH 2 -MIL-125-ligand) linkage between upconversion NaYbF 4 :Tm 3+ nanoparticles (~13-nm) and NH 2 -MIL-125. The ligand sharing integration strategy generated abundant oxygen vacancies and coordinatively-unsaturated-metal sites, efficiently enhanced light absorption, energy-transfer upconversion (UC-PL), photo-induced e - / h + generation, and their separation (CV, EIS, Photocurrent-density). Consequently, UCNP/NMIL(Ti) exhibited excellent acetaldehyde photodegradation activity, with 12.5–77.0-folds higher rate constants ( k a ) than those of state-of-the-art photocatalysts under visible light and high humidity. Furthermore, the photocatalytic activity of UCNP/NMIL(Ti) only declined from 96.0% to 92.5% after five cycling-runs, demonstrating its remarkable photo-catalytic stability. Considering these attributes, the current strategy provides an avenue to synthesize efficient UCNPs/MOF composites for widespread usage in a variety of commercial applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zhenke Fan,Yong Zheng,Yuze Du,Xi Zhang,Yuqi Huang,Yufan Li,Shiqing Yu
This study fabricated single-layer antireflective coatings (ARCs) employing a Si-Ti modified hollow silica nanoparticle (HSN) sol with self-cleaning function via in situ polymerization. Both shell-like and chain-like SiO₂–TiO₂ composites were directly synthesized in an alkali-catalyzed hollow SiO₂ sol through acid catalysis, which endowed the coating with suitable hardness while maintaining higher transmittance, thereby improving its overall performance. The influence of varying Si-Ti precursor doping ratios on the surface morphology, structure, optical performance, mechanical strength, and wettability of the coatings was investigated. The resulting coatings exhibited superhydrophilic properties, with a minimum water contact angle (WCA) below 5°. At an optimal doping concentration of 15 wt%, the coating achieved a hardness of 3 H and a solar-weighted transmittance (T sw ) exceeding 95.49 % across the wavelength range of 380–1100 nm, markedly surpassing that of the K9 glass (T sw = 91.70 %). At this doping level, the self-cleaning capability, antifogging performance, and environmental durability of the coating were further analyzed. The coating reached a self-cleaning efficiency of 95.93 % and a slight decrease of 0.03 % in T sw . After steam condensation experiment (sample placed above deionized water at 90 ℃ for 1 min), the haze value remained below 2 %. After 30 days of damp testing (80 % RH at 25 ℃), the reduction in T sw was only 0.07 %. After 100 thermal cycles (−20 ℃/30 %RH ↔ 100 ℃/30 %RH, each condition held for 30 min), T sw decreased by 0.3 %.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Rongchang Ren,Yaning Fu,Mengyao Huang,Zhongjun Li,Youcai Lu,Qingchao Liu
Rare-earth element doping-induced d orbital reconstruction of transition metals emerges as a critical mechanism to overcome the bottleneck of bifunctional catalytic activity in lithium-oxygen (Li O 2 ) batteries. By implementing a cerium doping defect engineering strategy, this study constructs [Ce C Ti] triatomic bridged active centers on MXene surfaces and systematically unravels the cross-scale regulation mechanism governing electronic structure deposition morphology electrochemical performance in MXene-based catalysts. Combined theoretical calculations and experimental characterizations demonstrate that the interfacial charge gradient field enables directional control of Li 2 O 2 epitaxial growth orientation, thereby inducing hierarchical porous structures while synergistically optimizing oxygen species adsorption/desorption kinetics. The [Ce C Ti] bonding disrupts inert electron chains and initiates electronic reconstruction effects, which significantly reduce reaction energy barriers through decoupling of O O bond orbital coupling strength, ultimately achieving self-consistent enhancement of oxygen reduction/evolution reaction activities. This work not only confirms the unique advantage of rare-earth element doping in modulating d orbital electron occupancy of transition metals but also elucidates the interfacial electron-lattice synergy in regulating oxygen electrode reaction pathways.
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Energy Storage Materials
·
2021
·
IF 17.789
Linlin Ma,Li-Juan Yu,Jingchong Liu,Ya-Qiong Su,Shuai Li,Xiaohuan Zang,Tao Meng,Shuaihua Zhang,Jianjun Song,Jiangyan Wang,Xiaoxian Zhao,Zhimin Cui,Nü Wang,Yong Zhao
As the desired sulfur host of lithium-sulfur battery, the strong polarity and fast electron migration capability are indispensable for achieving effective adsorption and conversion of lithium polysulfides (LiPSs), that is, restricting the shuttle effect. Herein a porous microdisk Ti 4 O 7 /TiN/C heterojunction with strong polar N-Ti-O covalent bonds is precisely constructed. Compared with O-Ti-O or N-Ti-N bond in single Ti 4 O 7 or TiN , the N-Ti-O bond with stronger polarity could adsorb and bond with S and Li atoms in LiPSs, which is beneficial for LiPSs adsorption. Beside, the Ti 4 O 7 /TiN heterostructure favors the electron transfer , which could promote the conversion of LiPSs. The design strategy is to construct abundant polar N-Ti-O bonds at Ti 4 O 7 /TiN heterogeneous interface that would realize the associative process of LiPSs adsorption, trapping, and conversion, thereby restraining the shuttle effect efficiently. In the current study, as the host of the sulfur cathode, the porous microdisk TiN/Ti 4 O 7 /C heterojunction exhibits a high specific capacity of 1204.5 mAh g −1 at 0.2 C, and a high specific capacity of 616.5 mAh g −1 at an ultrahigh current density of 4 C. In addition, 86.4% and 116.9% capacity are retained over 1000 cycles at 1 C and 2 C, respectively. This strategy provides an insight into developing lithium-sulfur battery with extraordinary performance, and opens promising routes to design the next-generation electrochemical energy storage devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenshuang Ma,Tao Deng,Lingling Ma,Youbing Li,Tian Xia
Plastic-metal hybrid (PMH) provides a new direction for aerospace and automotive rail transit fields to achieve lightweight. Hot pressing has broad application prospects in plastic/metal hybrids. Before the realization of TC4(Ti-6Al-4V)/PA66(Nylon 66) hybrid by hot pressing, different porous microstructures were prepared on the surface of TC4 by controlling the micro-arc oxidation (MAO) voltage (220 V, 240 V, 260 V, 280 V). Effect of different porous ceramic structures on the hybrid interface. Research shows that the microscopic porous ceramic structure on the surface of TC4 can enhance the surface wettability and wear resistance of TC4. Promote the embedding of PA66 into the TC4 surface to achieve mechanical interlocking. Different microstructures have different effects on bonding strength and failure modes. Especially at 240 V, the interface maximum bonding strength is 11.56 Mpa, and the interface failure mode is a mixed failure caused by plastic cohesion failure and plastic pull-out. In addition, XPS detection generates new chemical bonds, such as Ti-O and -C-Ti-O, at the hybrid interface. Compound reinforcement of mechanical interlocking and chemical bonding is achieved at the interface. In conclusion, these results are crucial for further designing and optimizing plastic-metal hybrids prepared using micro-arc oxidation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Guo Liu,Shuhao Tian,Chang Li,Yizhi Li,Zhiming Deng,Zhijun Zou,Jiayou Tao,Kun Tao,Hongcen Yang,Xiaoxiang Sun,Fen Li,Erqing Xie,Zhenxing Zhang
Catalytic conversion of polysulfides is regarded as a crucial approach to overcome the chronic challenges from polysulfides shuttling and sluggish redox kinetics. Heterostructure catalysts can synergistically combine the advantages of each component with an interfacial built-in electric field (BIEF), demonstrating outstanding adsorption and catalytic effects. However, the relationship between surface electronic structure and interfacial charge redistribution remains unclear. Here, surface-oxidized MXene/α-Fe 2 O 3 (MXTiO/α-Fe 2 O 3 ) heterostructure is developed as model catalyst to clarify the enhancement mechanism of polysulfides adsorption and conversion. Theoretical and experimental analysis confirms that the modified MXene as an electron acceptor steals partial electrons from α-Fe 2 O 3 through interfacial asymmetric Ti-O-Fe bridge bonds, inducing the spontaneous charge redistribution. The electrons transfer through Ti-O-Fe channels creates electron-deficient Fe sites on the surface, which not only reduces the antibonding orbital electron occupation, leading to strengthening the d -p orbital hybridization between surface Fe and polysulfides, providing a strong sulfur affinity, but also weakens S S bonds for accelerated cleavage. The resulting catalyst enables Li-S batteries with a capacity of 538 mAh g −1 at 5.0C. This investigation establishes a fundamental correlation between interfacial electron delocalization and surface electronic configuration modulation, thereby providing a rational insight for designing advanced heterostructured electrocatalysts in high-performance energy storage/conversion applications.
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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.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yan Li,Guangyu Chen,Jie Lin,Liuqing Huang,Chentong Zhang,Xuetao Luo
TC4 (Ti–6Al–4V) nanoparticles (TC4NPs) and silicon nanoparticles (SiNPs) with a median size of 146 and 51 nm were prepared by sand milling from scrap produced by refining silicon and TC4. The SiNPs and TC4NPs are mixed, carbonized, and leached in different proportions to obtain Si@C/TiO2@C/Hollow-C anode materials. The special structure of the anode materials provided more space for the volume expansion of silicon. The anatase TiO2 in TC4NPs relieves the volume expansion and reduces the transfer impedance, and the lithiated TiO2 can promote the electrical conductivity of the Si@C/TiO2@C/Hollow-C anode during the charge/discharge process. Furthermore, the Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) electrode delivers excellent rate performance; after cycling at a series of higher current densities, 92% of the original level of the reversible capacity can be maintained. The Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) anode retains 558 mA h·g–1 after 400 cycles with a large current density of 1000 mA·g–1. The synthesis method of the Si@C/TiO2@C/Hollow-C anode is a low-cost, facile, and nontoxic process, endowing it with the potential for application as energy materials for mass production.
研究领域:
材料科学
·
能源技术
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 9
·6934-6940
·
IF 1.339
Shi Huajun,Xiao Xin,Zeng Lixuan,Zhang Qiuyun,Nan Junmin,Wang Lishi
Three-dimensional (3D) titanates hierarchical macro/nano-architectures constructed by one-dimensional (1D) nanobelts are successfully synthesized by a hydrothermal-calcining process using metal Ti particles as a precursor. Their morphology and structure are characterized, and their
photocatalytic reactivity to tetracycline hydrochloride (TC) is evaluated under visible-light irradiation. The results show that the 1D nanobelts are formed through hydrothermal reaction, and then those 1D nanobelts encircle the metal Ti particles precursor to form 3D macro/nano-architectures.
The products with different phase composition, from hydrated titanium oxides to sodium titanates, are obtained by increasing the post-calcining temperatures from 200 °C to 800 °C. The photocatalytic degradation of TC is observed for all samples under visible-light irradiation, and
the sample calcined at 600 °C achieves the best photocatalytic reactivity. The visible-light performance of as-synthesized catalysts is considered as a charge-transfer mechanism initiated by the photoexcitation of the surface-complex between TC molecules and titanates, and then followed
by the photosensitization mechanism. Two intermediates are identified in the photodegradation process using liquid chromatography combined with mass spectrometry. In addition, the as-synthesized titanates are stable and can be used repeatedly, showing their promising prospect in the practical
applications.
研究领域:
材料科学
·
环境科学
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