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Interlocked silicon nitride nanowires-vertical carbon nanotubes/hydroxyapatite networks for reinforcing PEEK polymer composites

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Polymer 2025年 333卷

作者： Lina Sun Leilei Zhang Han Yu Tongtong Cui Shanshan Ma Hejun Li State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials Northwestern Polytechnical University Xi'an 710072 China State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Institute for Technical Chemistry and Polymer Chemistry (ITCP) Karlsruhe Institute of Technology (KIT) Engesserstraße 18 76131 Karlsruhe Germany

Polyetheretherketone (PEEK) is widely used in preparation of prosthesis due to excellent biocompatibility. However, the limited mechanical stability restricts the application in load-bearing bones. This study aims to develop PEEK composites for hip joint applications by integrating biological functionality with sufficient mechanical strength and biotribological properties. Here, we design an interlocked silicon nitride nanowires-vertical carbon nanotubes/hydroxyapatite network to reinforce PEEK (V-SCNT/HA-PK). Specifically, we control the vertical carbon nanotubes (V-CNT) growth on the surface of the silicon nitride nanowires (SN), forming V-SCNT network. The pulsed electrodeposition was used to induce the growth of hydroxyapatite (HA) nanosheets in the V-SCNT network to form interlocked V-SCNT/HA networks. Meanwhile, curved CNT (C-CNT) were introduced as a contrasting transition layer, facilitating the formation of C-SCNT/HA. The interlocked V-SCNT/HA networks as bioactive filler were incorporated into the PEEK matrix, forming V-SCNT/HA-PK. The interlocked V-SCNT/HA networks promote the penetration of PEEK matrix and improves the interfacial bonding and cohesive strength of the V-SCNT/HA-PK. Thus, this increases the mechanical and biotribological properties of the V-SCNT/HA-PK. Compare with the C-SCNT/HA reinforced PEEK (C-SCNT/HA-PK), V-SCNT/HA-PK have 194.17 %, 113.04 % and 113.32 % improvement in tensile strength, hardness and elastic modulus, respectively. The friction coefficient and wear rate of the V-SCNT/HA-PK reached 0.09 and 0.85 × 10 −14 m 3 (N·m) −1 , which is 70.00 % and 60.09 % lower than that of the C-SCNT/HA-PK. In addition, V-SCNT/HA-PK shows excellent biocompatibility and osseointegration. The present study provides a feasible interlocked V-SCNT/HA network reinforcement for enhancing the mechanical and biotribological properties of PEEK composites, which are expected to be applied in hip joint replacements.

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High pressure stabilized K 2 NiF 4 -type CaSmGaO 4 ceramics with high dielectric constant

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Journal of Alloys and Compounds 2025年 1034卷

作者： Leran Zeng Deyang Xu Weishuang Fang Xiuyun Lei Xiaojun Kuang Liang Fang Guobao Li Congling Yin MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources College of Materials Science and Engineering Guilin University of Technology Guilin 541004 PR China Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials College of Chemistry and Bioengineering Guilin University of Technology Guilin 541004 PR China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking University Beijing 100871 PR China

In this work, tetragonal ( t -) CaSmGaO 4 (space group: I 4/ mmm ) ceramics were obtained under high-pressure technique from the ambient pressure orthorhombic phase o -CaSmGaO 4 (space group: Pna 2 1 ) formed at 1250 ℃. The o -CaSmGaO 4 ceramic exhibited superior microwave dielectric properties, including a dielectric constant ( ε r ) of 10.3, a high Q × f value of 61,735 GHz, and a temperature coefficient of resonant frequency ( τ f ) of −50 ppm/℃, with a high relative density of 95.8 %. By contrast, the phase transformation in the CaSmGaO 4 ceramics resulted in t -CaSmGaO 4 displaying a higher ε r of 20.2, but significantly lower Q × f (21,861 GHz) and τ f (-35 ppm/℃), indicating increased dielectric loss. This inferior performance is attributed to enhanced bond strain and ca t ion disorder in the t -CaSmGaO 4 structure, as evidenced by its lower activation energy (1.051 eV) and higher global instability index ( GII ).

关键词： Dielectric losses

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Characterization of porous hyaluronan/β-TCP scaffolds prepared through heterogeneous crosslinking 9th

Characterization of porous hyaluronan/β-TCP scaffolds prepa...

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9th China Functional materials technology and Industry Forum, 9th CEMTIF 2017

作者： Zhao, Rui-Min Xue, Xian-Ya Wang, You-Fa State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology China

ISBN: (纸本)9783035712469

Porous Hyaluronan/β-tricalcium phosphate composite scaffolds were synthesized through lyophilizing and subsequent heterogeneous crosslinking method. The morphology of the composite scaffolds were investigated by scanning electron microscopy(SEM). The swelling behavior, mechanical property, degradation behavior and cell adhesion ability of samples were also studied. The results revealed that hyaluronan mainly contributed to the polymer matrix and water adsorption, whereas β-TCP acted as a reinforcement to strengthen the porous structure, while too much β-TCP would make the structure collapse. The pose size of obtained scaffolds ranges from100μm to 200μm and the porosity decreased with the increase of β-TCP content. The degradation behavior and cell adhesion test indicated that increasing hyaluronan concentration can effectively improve the degradability of scaffolds and the incorporation of β-TCP improved the cell adhesion performance. Thus a simple way to prepare hyaluronan-based composite scaffolds was provided, which could be potentially used as an tissue engineering material. © 2018 Trans Tech Publications, Switzerland.

关键词： Cell adhesion

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Calculated relative populations for the Eu@C84isomers

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Fullerenes, Nanotubes and Carbon Nanostructures 2021年第2期29卷 144-148页

作者： Zdeněk Slanina Filip Uhlík Lipiao Bao Takeshi Akasaka Xing Lu Ludwik Adamowicz a State Key Laboratory of Materials Processing and Die & Mould Technology School of Material Science and Engineering Huazhong University of Science and Technology Wuhan China b Department of Physical and Macromolecular Chemistry Faculty of Science Charles University Czech Republic c Department of Chemistry and Biochemistry University of Arizona Tucson AZ USA

Relative populations of eight low-potential-energy IPR (isolated-pentagon-rule) isomers of Eu@C84are computed using the Gibbs energy based on the B2PLYPD/SDD potential energy. The calculations agree with the recent observation that the major isomer is Eu@C2(13)-C84and the minor isomer is Eu@C2(11)-C84. There are also other two minor isomers suggested by the calculations. Insufficient solubility during soot extractions could explain why the two other minor species could not be isolated.

关键词： Eu@C84 metallofullerenes DFT & B2PLYPD calculations nanocarbon isomeric populations Gibbs-energy evaluations IPR fullerene cages

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Ultrafast synthesis of Nanoscale Metal Borides for Efficient Hydrogen Evolution

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Angewandte Chemie 2025年

作者： Dr. Tingting Liu Chen Chen Prof. Zonghua Pu Prof. Qiufeng Huang Jiadong Jiang Prof. Min Han Prof. Wei Chen Prof. Guangtao Yu Yuzhi Sun Dr. Shengyun Huang Prof. Qingjun Chen Prof. Abdullah M. Al-Enizi Prof. Ayman Nafady Xueqin Mu Prof. Shichun Mu Fujian Key Laboratory of Polymer Materials College of Chemistry and Materials Science Fujian Normal University Fuzhou Fujian 350117 P. R. China Fujian Cross Strait Institute of Flexible Electronics (Future Technology) Fujian Normal University Fuzhou Fujian 350117 P. R. China Ganjiang Innovation Academy Key Laboratory of Rare Earths Chinese Academy of Sciences Ganzhou 341000 P. R. China Department of Chemistry College of Science King Saud University Riyadh 11451 Saudi Arabia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China

Nanoscale metal borides, with exceptional physicochemical properties, have been attracted widespread attention. However, traditional synthesis methods of metal borides often lead to surface coking and large particle sizes. Herein, we have employed a flash Joule heating (FJH) technique to enable the ultrafast synthesis of metal boride nanomaterials. The synthesized materials encompass a wide range of diverse categories, including alkaline-earth metal borides (CaB 6 ), transition metal borides (TiB 2 , VB 2 , CrB 2 , MoB, MoB 2 , MnB 2 , MnB 4 , FeB, CoB, NiB), noble-metal borides (RuB 2 , RuB 1.1 ), and rare-earth metal borides (LaB 6 , CeB 6 ). As an example, the RuB 2 demonstrates highly desirable electrocatalytic performance for all-pH hydrogen evolution reaction (HER). Especially, under the acidic condition, it exhibits an overpotential as low as 15 mV at a current density of 10 mA cm −2 , with a nearly 100 % faradic efficiency. Additionally, in situ Raman spectra confirm that both Ru and B sites serve as active sites for the HER. Moreover, the stability of RuB 2 can be further enhanced by optimizing the microenvironments of the anolyte composition (H + , K + ). More importantly, the experimental and density functional theory (DFT) calculations reveal that the co-existence of H + and K + localized around the RuB 2 plays a crucial role in further enhancing the stability.

关键词： Metal borides• Joule heating ultrafast synthesis electrocatalysis hydrogen evolution reaction

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Superspreading-Based Fabrication of Poly(methyl methacrylate) Films with High Toughness for Ultra-Wideband Flexible Transparent Antenna

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materials (Basel, Switzerland) 2025年第10期18卷 2183页

作者： Ying Liu Cheng Huang Jiannan Guo Haoran Zu Jie Shen Pengchao Zhang Wen Chen Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang 441000 China. Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China. Hubei Engineering Research Center of RF-Microwave Technology and Application School of Physics and Mechanics Wuhan University of Technology Wuhan 430070 China. School of Information Engineering Wuhan University of Technology Wuhan 430070 China. Sanya Science and Education Innovation Park Wuhan University of Technology Sanya 572024 China.

With the rapid advancement of Internet of Things (IoT) technology, ultra-wideband flexible transparent antennas have garnered substantial attention for their potential applications in wireless communication devices. Poly(methyl methacrylate) (PMMA), renowned for its exceptional optical properties and favorable processing characteristics, has been extensively utilized as a transparent substrate material for antennas. However, the intrinsic brittleness of transparent PMMA substrates poses a significant limitation in applications such as flexible antennas. In this study, we introduce a superspreading strategy to address the complex trade-off among transparency, toughness, and dielectric properties in flexible electronics through molecular disorder engineering. The PMMA films fabricated via this superspreading strategy exhibit a visible transmittance of 85-95% at 400 nm, a toughness of 9 × 10⁵ J/m (representing an enhancement of 150-225% compared to conventional methods), and a frequency-stable permittivity (ε = 3.6 ± 0.05) within the 9-12 GHz range. These films also feature a precisely tunable thickness range of 5.5-60 μm. The PMMA-based flexible transparent antenna demonstrates a gain of 2-4 dBi and a relative bandwidth of 40%, thereby confirming its suitability for ultra-wideband applications. Collectively, this research presents a promising candidate for the development of ultra-wideband flexible transparent antennas.

关键词： PMMA films flexible transparent antenna high toughness superspreading

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High electrocaloric cooling power of relaxor ferroelectric BaZr_xTi_(1–x)O_3 ceramics within broad temperature range

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Science Bulletin 2018年第6期63卷 356-361页

作者： Jianfeng Qian Penghao Hu Chen Liu Jianyong Jiang Zhenkang Dan Jing Ma Yuanhua Lin Ce-Wen Nan Yang Shen School of Materials Science and Engineering and State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Institute for Advanced Materials and Technology University of Science & Technology Beijing

Electrocaloric effect （ECE） is much promising to realize high efficiency and environment friendly solution in solid cooling devices. Relaxor ferroelectrics are good candidates for the materials with high elec-trocaloric cooling power. In this paper, relaxor ferroelectric Ba（ZrxTil_x）O3 （BZT, x = 0.2, 0.21, 0.22, 0.23） ceramics were prepared with their temperature change （AT） induced by the ECE and electrocaloric strength （AT/E） measured within broad temperature range. It is found that the BZT21 （x = 0.21) exhibits the largest ATof-4.67 K and a high AT/E value of-0.46 km/MV at 9.9 MV/m and 25℃. BZT21 also exhi-bits apparent relaxor ferroelectric response, showing a very broad EC peak in the temperature interval between 15℃ and 50℃. Moreover, the relationship between EC properties and relaxor features was analyzed by piezoresponse force microscopy test. The results reveal that more dispersed phase structures induce additional configurational entropy, which is in favor for the enhanced EC performance. The inter-play and compromise between the kinetic and thermodynamic mechanisms of domain switching deter-mines the optimal composition for the EC performances of the BZT ceramics.

关键词： Electrocaloric effectRelaxor ferroelectricsPiezoresponse force microscopy Domain structure

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Co-Adsorption Characteristics of Antibiotics with Different Functional Groups and Cadmium Combined Contamination on Activated Carbon

SSRN

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SSRN 2023年

作者： Xu, Zisong Huang, Wenyu Wang, Shuangfei Song, Hainong Xu, Jing Mailhot, Gilles Tong, Zhangfa Zhang, Hanbing Li, Zhuofeng School of Civil Engineering and Architecture Guangxi University 100 Daxue East Road Nanning530004 China School of Resources Environment and Materials Guangxi University 100 Daxue East Road Nanning530004 China Guangxi Bossco Environmental Protection Technology Co. Ltd Nanning530007 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan430072 China Université Clermont Auvergne CNRS SIGMA Clermont Institut de Chimie de Clermont-Ferrand Clermont-FerrandF-63000 France Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Key Laboratory of Clean Pulp & Papermaking and Pollution Control of Guangxi China

Due to the diversity of functional groups of antibiotics, antibiotics are easy to complex with heavy metals, thereby changing their migration and transformation behavior. In this paper, the adsorption/complexation mechanism of three different types of antibiotics co-adsorbed with Cd(Ⅱ) and the systematic comparison between antibiotics was studied (norfloxacin (NOR), sulfamethazine (SMT) and tetracycline (TC)). We concluded that two NORs complexed with Cd(Ⅱ) through the oxygen atom from the carboxylic acid group and an oxygen atom from the carbonyl group in the ketone group to form a six-membered ring chelate. The Cd(II)(NOR±)2+ showed a stronger adsorption coefficient than other forms of NOR, Cd(II)(NOR±)2+ and Cd(Ⅱ) would compete with NOR for the same permanent charge sites, thus exhibiting an inhibitory effect on NOR adsorption. On the contrary, one SMT molecule complexed with Cd(Ⅱ) through the N atom on the pyrimidine ring and the -NH attached to the pyrimidine ring, forming an AC-Cd(Ⅱ)-SMT ternary complex on the activated carbon, and Cd(Ⅱ) acted as a similar bridge. The bridging effect of Cd(Ⅱ) and the multi-layer adsorption of SMT provided more adsorption sites for SMT, thus promoting the SMT adsorption. There was no complexation between TC and Cd(Ⅱ), and the addition of Cd(Ⅱ) had no significant effect on TC adsorption. The characterization analysis and molecular orbital calculation further supported that the complexation between Cd(Ⅱ) and antibiotics with different function groups had a strong correlation with the adsorption, and the environmental behavior of the system was jointly determined by the complex structure and the adsorption mechanism. © 2023, The Authors. All rights reserved.

关键词： Adsorption

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Core-shell structure-designed TiC-based ceramics with synergistic strength-toughness via low-temperature in-situ reaction sintering

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International Journal of Refractory Metals and Hard materials 2025年 132卷

作者： Jia Yao Boxin Wei Qinghua Hou Dong Wang Lei Chen Yujin Wang School of Materials Science and Chemical Engineering Harbin University of Science and Technology Harbin 150040 China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification and Green Forming Technology Harbin University of Science and Technology Harbin 150040 China School of Materials Science and Engineering Anhui University of Technology Ma'anshan 243002 China National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China Institute for Advanced Ceramics School of Materials Science and Engineering Harbin Institute of Technology Harbin 150080 China National Key Laboratory of Precision Welding & Joining of Materials and Structures Harbin Institute of Technology Harbin 150001 China

A novel TiC@(Ta, Ti)C-Ti 3 SiC 2 reinforced TiC-based ceramic was designed and fabricated via in-situ reaction hot-pressing sintering at 1500 °C using TiC, TaC, and Si powders. ‌The introduced Si reacts distinctly with TiC during sintering‌, forming Ti 3 SiC 2 /SiC reinforcements and enhancing atomic diffusion via liquid-phase sintering. The yields of Ti 3 SiC 2 /SiC increase progressively with higher Si content. Ti 3 SiC 2 dissipates crack propagation energy via multiple energy-absorbing pathways, effectively mitigating stress localization. The introduction of Ta with a slower interdiffusion ability in carbides and optimization of the Ta/Ti atomic ratio exploit their ‌asymmetric interdiffusion‌ to form a unique TiC@(Ta, Ti)C core-shell structure, which synergistically enhances both strength and toughness through tightly bonded core-shell interfaces and crack deflection. ‌TiC-7 mol% TaC-30 mol% Si (raw composition) demonstrates superior mechanical properties, achieving a flexural strength of 882 ± 34 MPa ‌and‌ fracture toughness of 8.10 ± 0.62 MPa·m 1/2 , ‌significantly exceeding those of most TiC- and TaC-based materials‌. In addition, the Si-modified TiC-based ceramics demonstrate excellent oxidation resistance at 1200 °C.

关键词： Fracture toughness

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Development of integrated two-stage thermoelectric generators for large temperature difference

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Science China(Technological Sciences) 2019年第9期62卷 1596-1604页

作者： PEI Jun LI LiangLiang LIU DaWei ZHANG BoPing XIAO Yu LI JingFeng The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing 100084China Huaneng Clean Energy Research Institute Beijing 102209China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Multi-stage thermoelectric(TE) modules can withstand a large temperature difference and can be used to obtain a high conversion efficiency. In this study, two-stage PbTe/Bi2Te3 TE modules were developed with an enhanced efficiency through a comprehensive study of device structure design, module fabrication, and performance evaluation. PbTe-based AgPbmSbTem+2(abbreviated as LAST) is a typically high ZT material, while the corresponding TE module was rarely reported so far. How to utilize LAST to fabricate high efficiency TE modules therefore remains a central problem. Finite element simulation indicates that the temperature stability of the two-stage module for LAST is better than that of two-segmented module. Compared to Cu,Ni, and Ni-Fe alloys, Co-Fe alloy is an effective metallization layer for PbTe due to its low contact resistance and thin diffusion layer. By sintering a slice of Cu on TE legs, pure tinfoil can be used as a common welding method for mid-temperature TE modules. A maximum efficiency(ηmax) of 9.5% was achieved in the range of 303 to 923 K in an optimized PbTe/Bi2Te3 based two-stage module, which was almost twice that of a commercial TE module.

关键词： PbTe thermoelectric two-stage module finite element method conversion efficiency

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