CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Fanyu Kong,Xiaodong He,Qianqian Liu,Xinxin Qi,Yongting Zheng,Rongguo Wang,Yuelei Bai
The presented work compared the etching behavior between combustion synthesized Ti 3 AlC 2 (SHS-Ti 3 AlC 2 ) and pressureless synthesized Ti 3 AlC 2 (PLS-Ti 3 AlC 2 ). Because the former had a more compact structure, it was harder to be etched than PLS-Ti 3 AlC 2 under the same conditions. When served as anode material for Li-ion batteries, SHS-Ti 3 C 2 showed much lower capacity than PLS-Ti 3 C 2 at 1 C (52.7 and 87.4 mAh g −1 , respectively) due to the smaller d -spacing. Furthermore, Potentiostatic Intermittent Titration Technique (PITT) was used to determine the Li-ion chemical diffusion coefficient ( D Li + ) of Ti 3 C 2 in the range of 10 −10 − 10 −9 cm 2 s −1 , indicating that Ti 3 C 2 could exhibit an excellent diffusion mobility for Li-ion.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
A.V. Parfeneva,V.P. Ulin,E.K. Khrapova,M.V. Tomkovich,G.V. Li,A.M. Rumyantsev,D.A. Kirilenko,E.V. Beregulin,A.A. Krasilin,E.V. Astrova
A method for accelerated synthesis of 2D MXenes Ti 3 C 2 T x from the MAX phase Ti 3 AlC 2 by selective etching of Al in acidic fluoride-contained solutions in the presence of HAuCl 4 as a catalyst is proposed. The results of characterization of the etching products using scanning and transmission electron microscopy, X-ray diffraction analysis, energy-dispersive X-ray spectroscopy and 4-probe resistivity measurements are presented. It is shown that the introduction of HAuCl 4 into the etching solution increases the rate of aluminum removal from the precursor crystals and increases the efficiency of their separation into 2D layers. The mechanism of such acceleration is a transfer of the hydrogen gas release region from the distributed front of aluminum dissolution inside the crystal to the clusters of gold formed on its outer surfaces.
研究领域:
材料科学
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纳米科技
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无机化学
·
凝聚态物理
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产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 13
·期 5
·2923-2930
·
IF 6.895
Xiaowei Li,Na Zhang,Ruizhi Tang,Jiawen Lyu,Zhen Liu,Shujuan Ma,Junjie Ou,Mingliang Ye
MAX and MXene have received considerable attention owing to their outstanding performance in fields like battery and catalysis. However, their possible biomedical applications have rarely been considered, especially the affinity chromatographic applications in proteomics. In this work, considering the large number of exposed metal sites, small binding potential resistance and fast mass transfer speed, layered ternary carbides MAX-Ti3AlC2 and MXene-Ti3C2 with a two-dimensional nanostructure were successfully explored for the first time as affinity chromatography stationary phases for the specific capture of phosphopeptides from complex biological samples. Helium ion microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction spectra, X-ray photoelectron spectroscopy and zeta potential measurement results confirmed that the MXene-Ti3C2 was well exfoliated from the pristine MAX-Ti3AlC2. Ti3AlC2 showed better enrichment specificity than MXene-Ti3C2. The detection limit of Ti3AlC2 was as low as 5 fmol. Even when the molar ratio of BSA to β-casein tryptic digests increased to 1000 : 1, two characteristic phosphopeptides with a relatively clear background could be detected after enrichment. After five cycles of repeated use, the enrichment specificity of Ti3AlC2 still remains. Furthermore, 91 and 830 unique phosphopeptides from 23 and 525 phosphoproteins were identified from milk and BEL7402 cells, respectively. Among them, 27 and 170 phosphopeptides, 12 and 56 phosphoproteins identified from milk and BEL7402 cells were not detected with commercial TiO2 after three independent replicates, which have great potential in providing complementary coverage of phosphoproteome. This work opens up new applications of Ti3AlC2 and MXene-Ti3C2, and will play more important role for phosphorylated proteomics in biomedicine.
研究领域:
生物化学
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分析化学
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生物医药
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产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 5
·1846
·
IF 3.748
Haiyao Cao,Zaiji Zhan,Xiangzhe Lv
Ti3AlC2presents a hexagonal layered crystal structure and bridges the gap between metallic and ceramic properties, and Gadolinia (Gd2O3) has excellent thermodynamic stability, which make them potentially attractive as dispersive phases for Cu matrix composites. In this paper, Cu@Ti3AlC2-Gd2O3/Cu composites, Ti3AlC2-Gd2O3/Cu composites, and Gd2O3/Cu composites were prepared by electroless Cu plating, internal oxidation, and vacuum hot press sintering. The microstructure and the effect of the Cu plating on the properties of the Cu@Ti3AlC2-Gd2O3/Cu composites were discussed. The results showed that a Cu plating with a thickness of about 0.67 μm was successfully plated onto the surface of Ti3AlC2particles. The ex situ Ti3AlC2particles were distributed at the Cu grain boundary, while the in situ Gd2O3particles with a grain size of 20 nm were dispersed in the Cu grains. The electroless Cu plating onto the surface of the Ti3AlC2particles effectively reduces their surfactivity and improves the surface contacting state between the Cu@Ti3AlC2particles and the Cu matrix, and reduces electron scattering, so that the tensile strength reached 378.9 MPa, meanwhile, the electrical conductivity and elongation of the Cu matrix composites was maintained at 93.6 IACS% and 17.6%.Keywords:Cu@Ti3AlC2-Gd2O3/Cu composites;electroless Cu plating;microstructure;electrical conductivity;mechanical properties
研究领域:
材料科学
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冶金工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Wenfeng Han,Hong Yang,Linzhe Wang,Bing Liu,Xiaoli Wei,Aimin Chen,Weiyu Song,Haodong Tang,Ying Li
Aluminum fluoride layers (AlFx) were prepared by the in situ etching of Ti 3 AlC 2 with 1,1-difluoroethane at elevated temperatures. During etching, Ti layers were fluorinated to stable TiF 3 interacting with C to confine the Al species and sublimable TiF 4 . Al layers were fluorinated to unsaturated AlFx with relatively weak Lewis acidity. Due to the sublimation of TiF 4 , more AlFx acting as the main active centers were exposed to the reactants, and the surface areas of the confined-AlFx were increased, which contributed to the enhanced activity of the catalyst. The evaluation of the dehydrofluorination reaction showed that confined-AlFx layers presented higher reaction rate than F-γ-Al 2 O 3 and AlF 3 . Besides, it was unexpected that TiF 3 also exhibited activity for the reaction, even though the activity was much lower than confined-AlFx. Finally, the experimental results were confirmed by DFT calculations.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Advances in Materials Science and Engineering
·
2022
·
IF 2.098
Liang Li,Yuqi Chen
Due to their high melting point, low density, and affordable price, TiC ceramics have emerged as one of the most promising ultrahigh temperature structural materials. However, its development and usage are severely constrained by its weak mechanical characteristics. The Ti2AlC-TiC and Ti3AlC2-TiC composites were synthesized by using the laminated metal-ceramic Ti2AlC/Ti3AlC2 as the binder, combined with high-temperature and high-pressure sintering technology (GPa order of magnitude confinement system). The thermal analysis shows that the exothermic heat of Ti/1.2Al/2TiC is less than that of 3Ti/1.2Al/2C, 2Ti/1.2Al/C, and 3Ti/1.5Al/C. The ratio of Ti/1.2Al/2TiC can suppress the thermal explosion phenomenon during the sintering process and improve the safety of the high-pressure sintering process. XRD results showed that the main composition of the sintered products was Ti2AlC-TiC at 2∼3.5 GPa and Ti3AlC2-TiC at 4∼5 GPa. As the sintering pressure increased from 2 GPa to 5 GPa, the bonding phase changed from Ti2AlC to Ti3AlC2. The thickness of the synthetic Ti3AlC2 layer is near 0.1 µm under 5 GPa. The average friction coefficient of Ti2AlC-TiC composites sintered 2 GPa with POM is as low as 0.1767, while the average friction coefficient of Ti3AlC2-TiC composites with POM increased to 0.3468∼0.3797. The wear width of Ti2AlC-TiC is lower than that of Ti3AlC2-TiC composites sintered under 4–4.5 GPa. The wear width of Ti3AlC2-TiC composites decreases following the rise of sintering pressure and is reduced to 0.3504 mm under 5 GPa. Ti2AlC-TiC and Ti3AlC2-TiC composites with PP ball counterparts have friction coefficients of 0.375 to 0.45 and worse wear resistance than that of POM balls. Ti3AlC2-TiC composites synthesized at 5 GPa with a Cu ball had the smallest friction coefficient (0.4558) and the smallest wear scar width (0.6289 mm). The friction coefficients and wear widths of synthetics with Al pairs ranged from 0.48–0.697 and 0.851–1.087 mm, respectively, and varied irregularly with increasing sintering pressure. Ti2AlC-TiC composites synthesized at 2 GPa with agate and glass pairs have coefficients of friction of 0.5 and 0.61, respectively. Abrasion widths of Ti2AlC-TiC composites synthesized at 2 GPa with agate and glass pairs were 1.3 mm and 0.72 mm, respectively. The friction coefficient of synthetics with agate and glass pairs increases with increasing sintering pressure. The magnetization and magnetization intensity of the Ti3AlC2-TiC composites are stronger than those of Ti3AlC2. Ti2AlC-TiC and Ti3AlC2-TiC composites held promise to serve in the field of ceramic grinding processing applications.
研究领域:
材料科学
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机械工程
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物理学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 31
·14958-14966
·
IF 3.925
Liang Shi,Kun Lu,Xiao Kong,Licheng Li,Xiaoli Gu,Junmeng Cai,Xingguang Zhang
Supported Pt catalysts play an important role in selective hydrogenation reactions for upgrading bio-derived chemicals, and they are traditionally prepared by methods such as deposition–precipitation (DP), wet impregnation (WI) and chemical reduction (CR) using NaBH4 and H2 under thermal conditions. This study developed a new reduction method to produce supported Pt NPs on nanofibers, in which Ti3AlC2 (a typical MAX phase) and chloroplatinic acid (H2PtCl6) were employed as raw materials, using as-produced H2 as a reducing agent under hydrothermal synthetic conditions. In the selective hydrogenation of furfural to furfuryl alcohol, the newly-developed catalyst of Pt2.0/Ti3AlxC2Ty exhibited high furfural (FUR) conversion (86.3%) and excellent furfuryl alcohol (FA) selectivity (98.1%) under optimized reaction conditions of 600 rpm, 100 °C, 3 h, and 1 MPa H2 in aqueous media. Moreover, these fibrous catalysts exhibited strong reusability and recyclability for five runs without loss of activity and selectivity.
研究领域:
催化
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化学工程
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材料科学
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绿色化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 6
·2101510
·
IF 6.389
Jun Li,Tongtong Xu,Han Bai,Zhenyu Shen,Yanyan Huang,Wenwen Xing,Zhongxiang Zhou
Microwave absorption enhancements through atomic doping in traditional materials remain a significant challenge. Herein, the MAX phase materials of Fe-doped Ti 3 AlC 2 ( x Fe-Ti 3 AlC 2 , abbreviated as TFAC- x , x = 0, 0.2, 0.3, 0.4) are synthesized via solid-phase reaction method. The X-ray diffraction, Raman, and scanning electron microscopy confirm that the TFAC- x samples are of high quality with multiphase coexistence structure and abundant interfaces. Relying on the improved impedance matching originating from structural modulation, the synergistic effects of dielectric loss and magnetic loss, as well as the enhanced interfacial polarization and defect dipole polarization, both the microwave absorption intensity and bandwidth are greatly strengthened. Accordingly, the minimum reflection loss of TFAC-3 sample can achieve -33.3 dB and the absorption bandwidth could reach 3.9 GHz with the thickness of only 1.5 mm. Moreover, the investigated frequency can cover 86% through regulating their thickness from 1.5 to 5 mm, showing the excellent frequency modulation effect. The revealed improvements in both the microwave absorption performance and properties of TFAC- x may enlighten the designing of microwave absorption materials and have potentials for widespread applications.
研究领域:
材料科学
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电磁材料
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微波吸收
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zetan Liu,Jingkun Xu,Xiaoqing Xi,Weijia Luo,Ji Zhou
Since the synthesis of non-oxidized ceramic and alloy powders requires both high temperature and oxygen insulation conditions, here we demonstrate a cost-efficient molten salt sealing/shielded synthesis method with dynamic gas tightness. Compared to conventional synthesis method, it can prevent the loss of reaction materials at high temperature, cut off the connection between reacting material and outside air, and does not require long-time ball milling mixing treatment or provision of applied pressing before or during heating. Only low-cost salts (e.g., NaCl, KCl), a few minutes of raw material mixing, and regular heating molds are required to obtain high-purity (>96 wt%), micron-sized Ti 3 AlC 2 and Ti 3 SiC 2 powders with narrow size distribution, which significantly decreased the complexity and production costs in the synthesis process. The effect of temperature and raw material content on the products were investigated. The mechanism of diffusion reaction between reactants in molten salt environment was analyzed. The new method developed here was also applicable to Ti 2 AlC, V 2 AlC and Cr 2 AlC MAX phases, as well as provided new ideas for the preparation of other MXenes precursors with certain stoichiometric ratios, air-sensitive materials and nanopowders .
研究领域:
材料科学
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化学工程
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Mansoor Khan,Ozgur Ozalp,Muslim Khan,Mustafa Soylak
In this work, we report the preparation of Fe 3 O 4 -Ti 3 AlC 2 max phase impregnated with 2-(5-Bromo-2-pyridylazo-5-(diethylamino) phenol) and its implementation for the extraction of cadmium, lead and cobalt from water and food samples. Blended Fe 3 O 4 -Ti 3 AlC 2 max phase impregnated with 2-(5-Bromo-2-pyridylazo-5-(diethylamino) phenol) was characterized using different instrumental techniques like scanning electron microscopy (SEM), surface area analyser (SAA), energy dispersive X-rays (EDX), Fourier transform infrared spectroscopy (FT-IR) and X-rays diffraction (XRD) for surface morphology, surface region, elemental composition, functional group and crystallinity, respectively. Factors that impact the % recoveries of analyte i.e pH, sample volume, vortex time, desorption condition and matrix impact were optimized. Analytical parameters like limit of detection (LOD) (Cd: 0.093 µg/L, Pb: 0.297 µg/L, Co: 0.223 µg/L), limit of quantifications (LOQ) (Cd: 0.310 µg/L, Pb: 0.992 µg/L, Co: 0.744 µg/L) preconcentration factors (PF) (Cd = Pb = Co: 40), enrichment factors (EF) (Cd: 39.8, Pb: 39, Co: 40) and relative standard deviation (RSD) (Cd: 3.8, Pb: 5.98, Co: 4.0) were determined under optimized trial conditions. The proposed strategy was tested using certified reference materials like TMDA-64.3 natural water and tobacco leaves (INCT-OBTL-5) for trace metal analysis. The developed strategy was also applied effectively to natural water samples and food samples using the standard addition method with good recovery results.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 13
·10564-10573
·
IF 2.22
Wang Li,Wang Chunyan,Shao Danni,Guo Jianyu,Zhao Qingfei,Lu Yan
A new supercapacitor electrode material Ti 3 C 2 T X @Al (T = OH, O) derived from Ti 3 AlC 2 is prepared by partly removing aluminum using alkali etching method at 40 °C. The reserved aluminum can not only ensure high interlayer conductivity but also prevent the structure from collapsing. The effect of etching time is investigated, the sample Ti 3 C 2 T X @Al obtained after etching 36 h in sodium hydroxide exhibits the best electrochemical performance among the series of samples. In 1M H 2 SO 4 , the material shows a high specific capacitance of 587 F g −1 at the current density of 1 A g −1 , and 173 F g −1 at 10 A g −1 . A low capacitance loss can be observed (0.0025% one cycle) after 6000 cycles test at the current density of 20 A g −1 . It implies that the material Ti 3 AlC 2 which etching in sodium hydroxide for 36 h may be a promising candidate for energy storage material, and this simple synthesis method can also be applied to other MAX members.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Aihu Feng,Yun Yu,Yong Wang,Feng Jiang,Yang Yu,Le Mi,Lixin Song
MXene , a new family of 2D materials , possesses excellent electrical conductivity and hydrophilicity . To date, the majority of MXenes are only successfully produced by exfoliating the MAX phases with high concentration hydrofluoric acid (HF). In this study, the 2D MXene Ti 3 C 2 with larger interplanar spacing was successfully obtained by etching Ti 3 AlC 2 with bifluoride (NaHF 2 , KHF 2 , NH 4 HF 2 ) in single-stage process. The morphology, structure and element composition of prepared Ti 3 C 2 samples were characterized by scanning electron smicroscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS). The synthesis mechanism of Ti 3 C 2 was elaborately demonstrated. The possible reaction equations between Ti 3 AlC 2 and different bifluorides were generalized, indicating the formation of hydrosoluble by-products of Na 3 AlF 6, K 3 AlF 6 and (NH 4 ) 3 AlF 6 . This work presents a safely effective method to synthesize the 2D nanocrystals MXene.
研究领域:
材料科学
·
化学工程
✓ 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）