CERAMICS INTERNATIONAL
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2019
·
IF 3.45
Qianglong He,Jingjing Xie,Aiyang Wang,Chun Liu,Tian Tian,Lanxin Hu,Chenhong Yi,Zhixiao Zhang,Hao Wang,Weimin Wang,Zhengyi Fu
B x C-TiB 2 -SiC ceramic composites were fabricated via reactive hot pressing using TiC, B, and Si as the raw materials. The phase transition process was studied by heating powder mixtures to different temperatures in combination with X-ray diffraction analysis. The stoichiometric ratio between B and C in boron carbide is variable. A series of powder mixtures containing excess boron (0 wt%, 10 wt%, 20 wt%, or 30 wt% B) were sintered, and the microstructures and mechanical properties of the composites were investigated. The results showed that the B 6.1 C-TiB 2 -SiC composite prepared from the starting powders with 30 wt% excess boron had the best comprehensive mechanical properties , with a relative density, hardness, bending strength , and fracture toughness of 98.32%, 33.2 GPa, 840 MPa, and 5.22 MPa m 1/2 , respectively. Excessive boron substitution may cause lattice distortion in boron carbide , and the boron carbide grains in this state may form a large number of twins under the compressive stress generated by the TiB 2 grains, which will affect the properties of the composites.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 7
·3205-3221
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IF 2.956
Daxin Li,Zhihua Yang,Dechang Jia,Delong Cai,Shengjin Wang,Qingqing Chen,Yu Zhou,Dongli Yu,Yongjun Tian
Amorphous boron-rich SiBCN were prepared by high-energy ball-milling of the mixtures of Si, graphite, h-BN, and inorganic boron, which acted as extra boron source. The solid-state amorphization, thermal stability, and crystallization of the boron-rich SiBCN were studied in detail. It was suggested that mechanical alloying can drive solid-state amorphization but also can be an initiation step for the nucleation of nanocrystals. The amorphous networks of Si-C, C-B, C-C, C-N, B-N, and C-B-N bonds are detected by XPS; however, solid-state NMR further confirms the formation of a new chemical environment around B atoms, BC 3 . The increases in boron content improve the thermal stability of SiBCN ceramics but weaken their oxidation resistance. Nano-SiC crystallizes first while BN(C) forms subsequently. Boron promoting SiC crystallization may result from the reduced hindering effects of B-N-C nanodomains that retard SiC crystallization.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 11
·3068-3075
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IF 4.853
Ruiqi Zhang,Huixiang Liu,Chenfeng Wang,Lincai Wang,Yanjing Yang,Yanhui Guo
Graphical Hydrogen evolution reaction : A strategy of electroless plating of transition metal boride with high boron content to fabricate binder-free catalytic electrode with superior HER activity has been realized. Facile deposition of transition metal boride (TMB) with high-boron content as highly efficient hydrogen evolution reaction (HER) electrocatalyst has been realized by a facile one-step electroless-plating (EP) method. Boron content of the TMB catalyst shows an appreciable impact on its intrinsic HER activity. NiB/NF electrode with thin amorphous nickel boride (NiB) deposition on nickel foam (NF) required overpotential of only 41.2 mV to deliver a current density of 10 mA cm −2 for HER in 1.0 M KOH alkaline electrolyte. Meanwhile, this kind of electrode also shows satisfied stability which can work at large current density of 1000 mA cm −2 for over 72 h without performance degradation. The advance on the TMB electrode may pave a way to the development of practical electrodes for water splitting.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yujie Song,Zewen Zhang,Ke Chen,Tianhao Li,Xun Sun,Ming Liu,Xiao (Matthew) Hu,Liu He,Qing Huang,Zhengren Huang
Incorporation of B atoms into SiOC ceramic can suppress the carbothermal reaction and improve the thermal stability. Polymer derived ceramics from single source preceramic polymer is a good solution but the B/Si ratio could not be efficiently adjusted. In this article, a simple, low cost, but efficient method to synthesize SiBCO preceramic polymers was introduced. The B/Si ratio could be adjusted from 1:10 to 5:10, and transformed into SiB 0.05 C 0.66 O 1.22 , SiB 0.07 C 0.62 O 1.28 , and SiB 0.27 C 0.54 O 1.32 upon sintering. The boron content could be readily tuned and the “pseudo low-temperature sintering” effect was systematically investigated. The boron content of sintered SiBCO ceramics could reach 4.9 wt%. The addition of boron suppresses the crystallization of β-SiC and improved thermal stability, indicating possible applications under harsh environments.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Smart and Nano Materials
·
2022
·
IF 4
Yafei Pan,Lei Huang,Jiuxing Zhang,Yong Du,Fenghua Luo
BxC-TiB2 ceramic composites were fabricated via reactive spark plasma sintering using TiC and B as the raw materials. The impact of B/TiC mole ratios on the phase compositions, densification behaviors, microstructure, and mechanical properties of the ceramic composites were investigated. The results showed that the stoichiometry of ‘BxC’ could be tailored by changing initial boron content and the obtained B4.5C, B6.5C and B8.5C phases have the same crystal structure (R-3 m). The excess of B enhanced the reaction between TiC and B, which released a large amount of hot energy and promoted the densification of the composites. The TB8.5 composite sintered at 1900°C had the best comprehensive mechanical properties, with hardness and flexural strength of 40.36 GPa and 551 MPa, respectively. The formation of nano-sized TiB2 grains induced by reaction were beneficial for improving the mechanical properties of these composites.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 8
·2694-2706
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IF 3.4
Jia-Xin Cheng,Wan-An Cai,Zhi-Cheng Wang,Abdul Qadeer Dayo,Zhi-Gang Yuan,Wen-Bin Liu,Jun Wang,Zhong-Cheng Pan
A novel boron-containing hyperbranched benzoxazine (HB-B) was synthesized from the reaction of triethanolamine borate (BAE), bisphenol-A, and paraformaldehyde via Mannich condensation. The chemical structures of BAE and HB-B were characterized by Fourier transform infrared (FT-IR) and hydrogen nuclear magnetic resonance ( 1 H NMR). Afterward, the boron-containing hyperbranched benzoxazine/epoxy resin copolymers (E51/HB-B) were prepared. The curing behavior of -B and E51/HB-B was studied by FT-IR and differential scanning calorimeter (DSC). The thermal stability and flame retardancy properties of the cured HB-B and E51/HB-B were evaluated by thermogravimetric analyzer (TGA), limited oxygen index (LOI), UL94 rating test, and microscale combustibility calorimeter experiments (MCC). The initial thermal decomposition temperature and glass transition temperature steadily dropped with increasing HB-B content, while the char yield kept rising. The LOI value of the E51/HB-B-12 wt% was 31.8%, meeting the UL94 V-0 specification. The result of heat release capacity (HRC) decreased by 20.4%. Moreover, the mechanical properties were also improved, and the tensile strength of E51/HB-B copolymer was increased by 88.5%. Finally, the fracture morphology of E51/HB-B was characterized by SEM.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongyu Tang,Zhijie Wang,Haoyang Hao,Weixian Luo,Jingru Yang,Mengyao Li,Mingxin Yang,Ziteng Chen,Ruyu Yan,Hao Li,Fan Hu,Haojun Liang,Qiuyang Liu,Linwen Lv,Junhui Zhang,Wenxi Su,Ranran Chen,Kui Chen,Ya-nan Chang,Meng Wang,Lingna Zheng,Xuesong Feng,Juan Li,Gengmei Xing
Nanocarriers have been researched comprehensively for the development of novel boron-containing agents in boron neutron capture therapy (BNCT). We designed and synthesized a multifunctional mesoporous silica nanoparticle (MSN)-based boron-containing agent. The latter was coated with a lipid bilayer (LB) and decorated with SP94 peptide (SFSIIHTPILPL) on the surface as SP94-LB@BA-MSN. The latter incorporated boric acid (BA) into hydrophobic mesopores, coated with an LB, and modified with SP94 peptide on the LB. SP94-LB@BA-MSN enhanced nano interface tumor-targeting ability but also prevented the premature release of drugs, which is crucial for BNCT because adequate boron content in tumor sites is required. SP94-LB@BA-MSN showed excellent efficacy in the BNCT treatment of HepG-2 cells. In animal studies with tumor-bearing mice, SP94-LB@BA-MSN exhibited a satisfactory accumulation at the tumor site. The boron content reached 40.18 ± 5.41 ppm in the tumor site 4 h after injection, which was 8.12 and 15.51 times higher than those in mice treated with boronated phenylalanine and those treated with BA. For boron, the tumor-to-normal tissue ratio was 4.41 ± 1.13 and the tumor-to-blood ratio was 5.92 ± 0.45. These results indicated that nanoparticles delivered boron to the tumor site effectively while minimizing accumulation in normal tissues. In conclusion, this composite (SP94-LB@BA-MSN) shows great promise as a boron-containing delivery agent for the treatment of hepatocellular carcinoma using BNCT. These findings highlight the potential of MSNs in the field of BNCT.
研究领域:
纳米技术
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癌症治疗
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材料科学
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药学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 6
·1739-1749
·
IF 2.911
Wang Hongli,Gao Dawei,Wang Liying,Chi Yue,Wang Minggang,Gu Yan,Wang Cong,Zhao Zhankui
Abstract The effective storage and generation of hydrogen at room temperature is an important issue in many areas, including alternative energy. In this work, NiCoB nanoalloys with high B contents, clean surfaces, and good dispersions are synthesized by an in-situ reduction method. The NiCoB catalyst with high B content exhibits significantly more excellent catalytic activity for hydrogen generation from the hydrolytic of ammonia borane than NiCoB catalyst with low B content. The remarkable catalytic performance is attributed to the strong electronic interaction between the incorporated B and the active metal sites of Co and Ni, the clean surface and good dispersion of the catalyst. Basically, the physical and catalytic properties of the catalyst take advantage of the selection of reductant used during the in-situ synthesis of the NiCoB nanoalloys. This work demonstrates that this facile synthetic method is a promising avenue for the rational design of various B incorporated metal catalysts for hydrogen energy exploitation, metal/air batteries, and electrochemical sensors. Graphical Abstract
研究领域:
材料科学
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催化
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能源存储
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纳米技术
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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）