CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xingjie Su,Hongzhi Xiao,Linzhao Ma,Qianbiao Du,Hao Li
A series of Li 2 Mg 9 Ti 7- x O 24 (0.1 ≤ x ≤ 0.3) ceramic materials were synthesized via a conventional solid-state reaction. The influence of non-stoichiometric Ti-site content on sintering behavior, phase composition and dielectric properties was systematically studied. Rietveld-refined XRD patterns confirmed that the ceramics exhibited inverse spinel structures. The vibrational properties of the ceramic samples were analyzed using Raman spectroscopy. The results showed that an appropriate Ti-site deficiency (0.1 ≤ x ≤ 0.3) not only reduced the optimal sintering temperature by 40°C but also suppressed impurity formation, as evidenced by reduced minor XRD peaks. Notably, the Li 2 Mg 9 Ti 6.9 O 23.8 ceramic sintered at 1260°C for 4h achieved optimal microwave dielectric properties (MDPs): ε r = 16.25, Q×f = 71,104 GHz and τ f = –48.8 ppm/°C. Furthermore, a novel dielectric resonator antenna (DRA) was designed and simulated based on Li 2 Mg 9 Ti 6.9 O 23.8 ceramics. The DRA exhibited a gain of 6.42 dB and a bandwidth of 280 MHz, highlighting its potential for applications in microwave communication systems.
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高影响因子
Nanoscale Advances
·
2025
·
IF 4.6
Shahzad Hussain,Resham Siddique,Muhammad Nadeem,Eman Zafar,Sadia Manzoor,Jawwad A Darr
The rapid advancement of highly integrated electronics demands next generation electromagnetic interference (EMI) shielding materials that combine lightweight, ultrathin, flexible, and mechanically robust properties with exceptional shielding effectiveness (SE) to mitigate signal crosstalk and ensure device reliability. In this work, we demonstrate the fabrication of high-performance EMI shields using highly conductive, additive-free aqueous Ti3C2Tx (T = O, OH, Cl, F) MXene dispersions synthesized under both harsh and mild etching conditions. These dispersions were engineered into freestanding thin films and functionalized cotton fabrics via vacuum-assisted filtration, enabling tunable EMI shielding properties through precise control of etchant chemistry, flake size, microstructure, thickness, and MXene loading. The EMI shielding improved with film thickness and the 13 μm thick film demonstrated exceptional EMI shielding of 60 dB. The freestanding heat treated Ti3C2Tx film with minimal thickness of 5 µm achieved a remarkable shielding effectiveness of 71 dB (which is 37% higher than the untreated film) corresponding to 99.99999% EMI attenuation. This film also exhibited an ultrahigh absolute shielding effectiveness (SSET) of 72,300 dB cm2 g−1, surpassing all previously reported MXene-based shields of comparable thickness. The improved stability was attributed to thermal conversion of surface OH groups to O-terminations, reducing interflake spacing and enhancing conductivity. The coated cotton fabric achieved an unprecedented SE of 82 dB due to the excellent wave attenuation associated with its porous structure. Notably, the fabric retained its shielding performance even after six months of ambient exposure, highlighting exceptional environmental stability. This study establishes critical structure-property relationships, revealing that induced porosity, meta-structure effects, large flake size, and optimized surface terminations synergistically enhance EMI shielding. By elucidating the interplay between material parameters and shielding performance, this work provides a foundational framework for designing advanced EMI mitigation technologies, paving the way for scalable, high-performance shielding solutions in next-generation flexible and wearable electronics.
研究领域:
材料科学
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纳米技术
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电磁学
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表面工程
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柔性电子学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yubo Zhou,Xinbo Zhao,Zan Li,Junchao Yin,Liangmin Yu
To address ion interference in photocatalytic antibiotic degradation within high-salt seawater, this study innovatively designed and synthesized a titanium-based metal–organic framework (MOF) heterojunction composite. Specifically, a solvothermal technique was used to create MIL-125(HAC)/TiO 2 (TAC) photocatalysts using commercial TiO 2 (P25) and MIL-125(Ti) that had been treated with acetic acid. Remarkably, under 60 min of visible-light irradiation, the optimized TAC-2 sample achieved 95.7 % tetracycline (TC) degradation in seawater (compared to 98.1 % in deionized water) and retained >85 % efficiency after four cycles. Critically, its degradation rate constant (k=0.0355 min −1 ) in seawater was 44.4 times higher than that of P25, demonstrating exceptional resistance to salt-ion interference and photocatalytic activity. Mechanistic studies revealed that the performance enhancement arises from three synergistic mechanisms: (1) A mesoporous structure mitigating ion interference and strengthening TC-selective adsorption; (2) A Type-II heterojunction enabling efficient charge separation; (3) •O 2 − and h + identified as dominant active species (confirmed by EPR and quenching tests). Collectively, this work establishes an effective MOF heterojunction engineering strategy for efficient antibiotic removal in saline environments, ultimately contributing to marine pollution remediation.
研究领域:
环境科学
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材料科学
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化学工程
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光催化
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海洋污染
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 7
·4382-4389
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IF 3.9
Yongqiang Tan,Wei Liao,Zhen Teng,Haibin Zhang
Two high-entropy carbides, including stoichiometric (Zr,Ti,Nb,Ta,Hf)C and nonstoichiometric (Zr,Ti,Nb,Ta,Hf)C 0.8 , were prepared from monocarbides and ZrH 2 . Their sinterability, microstructures, mechanical properties, thermophysical properties, and oxidation behaviors were systematically compared. With the introduction of carbon vacancy, the sintering temperature was lowered up to 300°C, Vickers hardness was almost unaffected, whereas the strength decreased significantly generally due to the decrease of covalent bonds. The thermal conductivity shows a 50% decrease for nonstoichiometry high-entropy carbide, which is a major consequence of the lower electrical conductivity. The oxidation resistance in high temperature water vapor was not sensitive to carbon stoichiometry.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·5918-5928
·
IF 3.83
Yu Zhao,Tianqi Zhang,Liaoyuan Chen,Tianbiao Yu,Jiayu Sun,Chuang Guan
In situ Ti(C, N), ring phase, and multi-phase enhanced Ni204-based alloy coating were prepared by adding various Ti/C/TiN ratios particles. The effects of the reinforcement phase on the microstructure, microhardness , tribological property, and microstructure characteristics at the interface between the coating and substrate were investigated. The results show that the coatings with a 5:1 mass fraction ratio of TiN/C exhibits the highest microhardness , which is 3.78 times higher than that of the original Ni204 coating. While, the coating with 21:7:2 mass fraction ratio of TiN/Ti/C exhibits the lowest friction coefficient , which is 4.44 times smaller than that of the original Ni204 coating. The addition of Ti and C particles promotes the precipitation of ring phase and carbides , reduces ceramic agglomeration, alleviates the floating of ceramic particles, and improves the bonding strength of reinforcement phases. Owing to the good mutual solubility among Fe, Ni, and, Cr elements, the diffusion happened at the interface between the coating and substrate.
研究领域:
材料科学
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表面工程
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金属学与金属工艺
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机械工程
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复合材料
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 16
·26428-26439
·
IF 5.2
Kai Su,Xuekun Tian,Suping Li,Junyan Cui,Xinhong Liu,Bo Song
Using low-cost and highly reactive bamboo charcoal, Ti and Si elemental powders as starting materials, Ti 3 SiC 2 powder was synthesized via a simple and cost-efficient pressureless sintering technique in argon atmosphere. The influences of synthesis temperature, holding time and Si content on the Ti 3 SiC 2 content of the synthesized products were investigated, and the analysis indicated that the relative content of Ti 3 SiC 2 reached 98.9 wt% with a molar ratio of 3Ti/1.2Si/2.2C at 1400 °C for 1.5 h. The Ti 3 SiC 2 with good crystallinity and homogeneous nanolayered structure was synthesized at lower temperatures due to the high reactivity and high specific surface area of bamboo charcoal. The non-isothermal oxidation behavior showed that Ti 3 SiC 2 powder was stable in air below 540 °C. With the temperature increasing up to 1300 °C, continuous and dense TiO 2 and SiO 2 oxidation layers were formed on the surface of Ti 3 SiC 2 particles, which conferred good oxidation resistance to Ti 3 SiC 2 powder.
研究领域:
材料科学
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陶瓷学
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固态化学
·
高温材料
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DOI
高影响因子
MATERIALS & DESIGN
·
2026
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IF 7.9
Sun Xuetong,Wang Beibei,Sun Hao,Ren Xiue,Zhou Changren
The application of Selective Laser Melting (SLM) porous titanium scaffolds for patient-specific implants is steadily expanding; however, enhancing their bioactivity to support effective bone repair remains a significant challenge. This study presents a novel composite scaffold designed to enable spatiotemporally controlled release of dexamethasone (Dex) and bone morphogenetic protein-2 (BMP-2), thereby promoting bone regeneration and establishing a pro-healing microenvironment in bone defects. The composite scaffold integrates an outer SLM-Ti framework coated with a Dex-loaded polypyrrole (PPy) film for on-demand release, and an inner OSA-Gel (OG) hydrogel loaded with BMP-2-encapsulated mesoporous bioactive glass nanoparticles (MBGNs) for sustained delivery. The results demonstrate that the controlled dual delivery of BMP-2 and Dex exerts a significant synergistic effect in promoting cellular proliferation and osteogenic differentiation in vitro. These findings provide a theoretical basis for advancing SLM-Ti customized implants toward preclinical application in bone regeneration.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Huicai Xie,Zhaojun Mo,Quanyi Liu,Hao Sun,Shengcan Ma,Xinqiang Gao,Jun Shen
EuTiO 3 exhibits various interesting physical properties, including magnetocaloric effect, quantum paraelectricity, magnetoelectricity, and multiferroic properties, thus attracting a broad range of attention from the researchers. The delicate balance between ferromagnetic coupling and antiferromagnetic interactions offers the feasibility of modulating the magnetic properties and magnetocaloric effect for this perovskite. Herein, a range of Eu(Ti,B)O 3 perovskites were prepared by substituting titanium with different amounts of boron. A comprehensive investigation on their structure, magnetism, magnetocaloric effect, and critical behavior was performed. All the compounds are confirmed to be crystallized in a single cubic perovskite structure with space symmetry of Pm 3 m , with the introduced boron uniformly distributed in the compounds. The transition temperatures are determined to be 6.0, 6.5, 5.0, and 5.0 K for EuTi 0.9375 B 0.0625 O 3 , EuTi 0.875 B 0.125 O 3 , EuTi 0.8125 B 0.1875 O 3 , and EuTi 0.75 B 0.25 O 3 , respectively. The results of both magnetic measurements and critical behavior analysis suggest that appropriate substitution of boron promotes the magnetic transition from AFM to FM in Eu(Ti,B)O 3 . In addition, significantly enhanced low-field magnetocaloric effects were observed in these perovskites. Under field changes of 0–1 and 0–2 T, the values of - Δ S M max are 14.7 and 26.4 J·kg −1 ·K −1 for EuTi 0.8125 B 0.1875 O 3 , 15.2 and 27.4 J·kg −1 ·K −1 for EuTi 0.75 B 0.25 O 3 , respectively.
研究领域:
凝聚态物理
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材料科学
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磁性材料
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钙钛矿氧化物
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固态化学
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高影响因子
PLASMA SOURCES SCIENCE & TECHNOLOGY
·
2024
·
IF 3.3
Yang Wang,Qiuyao Cao,Xi-Ming Zhu,Chun-Meng Du,Klaus Bartschat
Abstract. Introduction: We present an extensive theoretical investigation of the electron impact excitation of doubly-ionized titanium (Ti III) to meet the needs of spectral analysis and plasma modeling.
OBJECTIVES: The main objective of this work is to extend the currently scarce database of both structure and collision data for Ti III.
METHODS: The calculation was performed in the close-coupling approximation using the B-spline R-matrix method. The multi-configuration Hartree–Fock method in combination with B-spline configuration interaction expansions and the non-orthogonal orbitals technique is employed for accurate descriptions of the target wave functions and adequate accounts of the various interactions between the target states. Relativistic effects are treated at the semi-relativistic Breit-Pauli approximation level.
RESULTS: The present close-coupling expansion includes 138 fine-structure levels of Ti III belonging to the 3d2, 4s2, 4s4p, 3d4l (l=0-3), 3d5l (l=0-3), 3d6s, and 3d6p configurations. Comprehensive sets of radiative and electron collisional data are reported for all of the possible transitions between the 138 fine-structure levels. Thermally averaged collision strengths are determined using a Maxwellian distribution for a wide range of temperatures from 102 K to 105 K. The accuracy of the calculated radiative parameters is validated by comparing with available values from the NIST database and previous literature.
CONCLUSION: Given the lack of sufficient currently available experimental and theoretical data, the electron impact excitation cross sections of the Ti III fine-structure levels presented here are systematic, extensive, and internally consistent, thus making them suitable for many modeling applications.
研究领域:
原子物理
·
等离子体物理
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理论光谱学
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原子碰撞理论
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天体物理等离子体
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Shengjie Xia,Lianyang Zhang,Xiaobo Zhou,Mengmeng Shao,Guoxiang Pan,Zheming Ni
In this paper, Ti-contained Schiff base complex was intercalated into the interlayer of the ZnCr layered double hydroxides (LDHs) to form a novel layered organic–inorganic nanoscale material. And then, the hybrid material was further calcined to make metal oxides composite contained Zn, Cr and Ti (Ti/ZnO–Cr 2 O 3 ). This composite was used to study the performance and mechanism for naphthalene ( l -acid) photodegradation under visible light. The characterization results showed that Ti/ZnO–Cr 2 O 3 composite has higher specific area, more uniform pores size distribution and narrower band gap than that of original ZnCr–LDHs. Both physico-chemical property and photocatalytic performance for l -acid degradation by Ti/ZnO–Cr 2 O 3 were greatly improved with the increasing of calcination temperature, due to the highly crystalline structures with appearance of spinel ingredients of Zn, Cr and Ti. In addition, the molar ratio of Ti/Cr would also influence the photocatalytic property of the materials. Ti/ZnO–Cr 2 O 3 composite with Ti/Cr = 1 and calcined at 800 °C not only has narrow bang gap (2.11 eV) and high surface area (227 m 2 ), but also shows highest photocatalytic performance for l -acid degradation (90.2% within 240 min). Furthermore, the types and amounts of active radicals of photo oxidation reaction were also tested. The photocatalytic mechanism of the Ti/ZnO–Cr 2 O 3 composite was also discussed. Moreover, based on the results from HPLC–MS, GC–MS, FT–IT and DFT analysis, the decomposition intermediates and reaction pathway for l -acid were investigated in detail.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
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物理化学
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环境工程
·
能源与可持续发展
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DOI
高影响因子
Green Energy & Environment
·
2026
·
IF 16.7
Zhijun Wang,Kelei Zhuo,Mengya Yang,Li Sun,Dong Sun,Yujuan Chen,Jianji Wang
The trade-off between energy and power density remains a major hurdle for supercapacitors (SCs). This work demonstrates a substantial performance enhancement in aqueous hybrid supercapacitors through synergistic electrode and electrolyte engineering. First, titanium-doped nickel selenide nanospheres (Ti-Ni 0.85 Se) are successfully synthesized via a hydrothermal method using trace Ti 3 C 2 T x MXene as a controllable titanium source. The incorporated Ti atoms induce a slight lattice expansion and optimize the electronic structure, significantly improving the intrinsic conductivity and charge-transfer kinetics of the material. In a 3 mol L -1 KOH electrolyte, the Ti-Ni 0.85 Se electrode delivers a high specific capacity of 586 C g -1 at 1 A g -1 . Furthermore, introducing K 4 [Fe(CN) 6 ] as a redox-active additive provides additional Faradaic capacity via the reversible [Fe(CN) 6 ] 3-/4- couple, boosting the specific capacity of Ti-Ni 0.85 Se to 861 C g -1 . The assembled Ti-Ni 0.85 Se//activated carbon hybrid supercapacitor achieves a high energy density of 35.7 Wh kg -1 at a power density of 1156 W kg -1 , with 71.6% capacitance retention after 3000 cycles. This study validates the synergistic strategy of electrode doping and electrolyte modulation as an effective pathway to break the performance bottlenecks of supercapacitors.
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Long Ye,Juntao Si,Cheng Zhang,Sihan Zeng,Chunhua Chen
Ti-Ni co-doping improves electrochemical kinetics and powder densification. • Dopants Ti and Ni function on the Mn- and Fe-redox regions, respectively. • Powder compaction density increases by 8.5% to 2.04 g cm −3 after Ti-Ni doping. LiMn 0.6 Fe 0.4 PO 4 (LMFP) is a promising high-energy cathode, but its practical application is constrained by sluggish Mn 2+ /Mn 3+ redox kinetics and insufficient powder compaction density (PCD). Herein, Ti-doped, Ni-doped, and Ti–Ni co-doped LMFP/C were prepared by a ball-milling-assisted solid-state route. It is clarified that Ni predominantly accelerates the Fe 2+ /Fe 3+ reaction, whereas Ti promotes the kinetically slower Mn 2+ /Mn 3+ reaction and improves cycling stability. The optimal sample LMFP-2Ti-2Ni delivers 163.1 and 142.9 mAh g −1 at 0.1 and 5 C, respectively, and retains 90.8% of its capacity after 400 cycles at 1 C. Relative to pristine LMFP, the Ti-Ni co-doping increases the 0.1 C capacity from 144.7 to 163.1 mAh g −1 (+12.7%) and the PCD from 1.88 to 2.04 g cm −3 (+8.5%). Also, the relative unit-cell-volume variation decreases from approximately 5.2% to 4.6%, indicating more gradual bulk-lattice evolution. Thus, Ti–Ni co-doping as a complementary strategy can simultaneously improve rate capability, cycling durability, and particle packing in LMFP/C cathodes. Download: Download high-res image (356KB) Download: Download full-size image
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高影响因子
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