CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiao-Hui Yang,Yu Wang,Guo-Hua Zhang,Kuo-Chih Chou
Tungsten and molybdenum borides are widely used in ultra-high temperature ceramics (UHTCs) and electrode material. In this research, ultra-fine and ultra-coarse binary borides (WB, W 2 B 5 , MoB, Mo 2 B 5 ) and MoAlB powders were prepared with W/Mo and B 4 C as raw materials and Ca/Al as the decarbonization agent. The feasibility of using Ca and Al as decarburizing agents was assessed by thermodynamic calculations. Meanwhile, the effects of reaction temperature, decarbonization agent type and its additional amount on the phase, morphology and size distribution of the powder products were thoroughly investigated. The results revealed that single phase products with carbon content of less than 1 wt% could be prepared. Moreover, the morphology and particle size of products were significantly affected by the reaction temperature and type of decarburization agent. When using Ca as the decarburizing agent, ultra-fine WB and MoB powders were effectively prepared, probably owing to the fact that W/Mo are essentially insoluble in Ca melt. However, the great solubility of W/Mo in Al makes it easily to synthesize ultra-coarse borides at high temperatures via the dissolution-precipitation mechanism. Additionally, ultra-fine borides particle can also be prepared by lowering the temperature and amount of Al to weak the dissolution-precipitation mechanism.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Dongbo Chen,Nian Fu,Yufeng Chang,Yu-e Shi,Zhenguang Wang
The construction of afterglow materials with full-color tunable emissions is attractive but still a challenging task. Herein, a host–guest doping strategy was proposed to produce afterglow materials with an emission-color span of almost 210 nm (from blue to deep red) by heat treating the aqueous mixture of arylboronic acids and boric acid (BA). In-depth structural, photophysical, and theoretical studies revealed that the heat treatment process resulted in the dehydration of BA and the formation of a glassy state host, and arylboronic acids were loaded as guest molecules through H-bonds and covalent bonds with BA. The afterglow originated from arylboronic acids, and the afterglow color of products was related to their degree of conjugation of aromatic groups. The host–guest doping strategy significantly improved the photophysical performances of arylboronic acids, achieving a photoluminescence quantum yield as high as 81.7% and an emission lifetime of 2.90 s (afterglow >22 s). Triple information encryption based on emission lifetime and color-encoding was also achieved, demonstrating their commercial potential for use in anticounterfeiting and information storage.
研究领域:
材料科学
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光物理学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2022
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IF 4.804
Yu Wang,Yue-Dong Wu,Guo-Hua Zhang
Molybdenum or tungsten borides are excellent high-temperature ceramics or electrocatalysis materials. In this paper, Mo or W borides were prepared by boronizing Mo or W powder in Al melt with B 4 C as boron source. By thermodynamic calculation, the feasibility of preparing various borides and the stability of borides in Al melt were evaluated. Through high temperature reaction at 1523 K and the following acidic leaching, single phase MoAlB, W 2 B 5 , WB, and W 2 B 5 powders were successfully synthesized. Owing to the decarburizing function of Al melt, C contents of various boride products were below 1 wt%. In addition, the phase transition processes of various products in the synthesis stage were revealed.
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
JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
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IF 3.178
Tao Zhang,Lan Yang,Dan Li,Lingzong Meng,Yafei Guo,Tianlong Deng
The pH values, solubilities and water activities in the system LiB(OH) 4 –NaB(OH) 4 –H 2 O at 323.15 K were investigated. The mole fractions of boron species were calculated in the aqueous borate solutions, and the distribution and relevant mechanism were also discussed. The solubility diagrams in the ternary system were drawn at 323.15 K. The phase diagram consists of two single salt regions for LiB(OH) 4 and NaB(OH) 4 ·2H 2 O, one invariant point co-saturated with the above salts. On the basis of the Pitzer model, the Pitzer binary parameters and mixing parameters were fitted with the water activities, saturated vapour pressure and solubilities in the ternary system. The dissolution equilibrium constants ( K sp) of LiB(OH) 4 and NaB(OH) 4 ·2H 2 O were calculated using the experimental solubility data. The calculated solubilities with the parameters and K sp agree well with the experimental data.
研究领域:
物理化学
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热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 61
·期 4
·346-354
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IF 3.046
Die Li,Mei Hong,Yan Wang,Chunyang Bao,Xiaoling Xu,Jing Chen,Bin Peng,Jingyu Zhang,Bingyu Wang,Qiang Zhang
Porous carbon nanospheres have attracted extensive attention due to their excellent advantages in specific surface area, pore distribution, and electronic conductivity. Herein, boron-doped hollow carbon nanospheres with mesoporous walls have been successfully synthesized via a combination of hard/soft templating and boronic acid/sugar ligation. Surface-initiated Cu(0) mediated reversible deactivation radical polymerization was used to initiate the polymerization of 2-hydroxyethyl acrylate and poly(ethylene glycol) methyl ether acrylate from the surface of silica. 4-carboxy-3-fluorophenylboronic acid was introduced as a boron precursor by N -(3-dimethylaminopropyl)- N ′-ethylcarbodiimide hydrochloride coupling and fructose was introduced as a carbon precursor by boronic esters. After carbonization and template etching, boron-doped porous carbon spheres could be obtained. We believe such in-situ heteroatom-doped method has great potential in preparing hollow mesoporous carbon nanospheres with excellent properties. Graphical
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Shaoxian Song,Song Wu,Yating He,Yiwen Zhang,Guangyin Fan,Yan Long,Shuyan Song
Developing a straightforward and general strategy to regulate the surface microenvironment of a carbon matrix enriched with N/B motifs for efficient atomic utilization and electronic state of metal sites in bifunctional hydrogen production via ammonia-borane hydrolysis (ABH) and water electrolysis is a persistent challenge. Herein, we present a simple, green, and universal approach to fabricate B/N co-doped porous carbons using ammonia-borane (AB) as a triple functional agent, eliminating the need for hazardous and explosive functional agents and complicated procedures. The pyrolysis of AB induces the regulation of the surface microenvironment of the carbon matrix, leading to the formation of abundant surface functional groups, defects, and pore structures. This regulation enhances the efficiency of atom utilization and the electronic state of the active component, resulting in improved bifunctional hydrogen evolution. Among the catalysts, B/N co-doped vulcan carbon (Ru/BNC) with 2.1 wt% Ru loading demonstrates the highest performance in catalytic hydrogen production from ABH, achieving an ultrahigh turnover frequency of 1854 min −1 (depending on the dispersion of Ru). Furthermore, this catalyst shows remarkable electrochemical activity for hydrogen evolution in alkaline water electrolysis with a low overpotential of 31 mV at 10 mA cm −2 . The present study provides a simple, green, and universal method to regulate the surface microenvironment of various carbons with B/N modulators, thereby adjusting the atomic utilization and electronic state of active metals for enhanced bifunctional hydrogen evolution.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2023
·Vol. 76
·期 4
·194-200
·
IF 1.1
Zhijun Yuan,Yunshi Liang,Yiting He,Huiying Deng,Haiting Wu,Bohong Lin,Jing Zhang
AlCl3-mediated protodeboronation of arylboronic acids and esters is reported herein. This method features mild reaction conditions, high reaction yields, as well as short reaction times. Mechanistic studies based on 11B NMR spectroscopy suggest that it might proceed through initial boron activation by coordination of AlCl3 to the oxygen atom of arylboronic acid or ester groups.
研究领域:
有机化学
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催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Kangkang Yang,Qilu Yao,Wei Huang,Xiangshu Chen,Zhang-Hui Lu
In this work, a series of Ni 1-x M x (M = Cr, Mo, W) nanoparticles (NPs) have been successfully synthesized via a simple surfactant-aided co-reduction method and employed as highly efficient and cost effective catalysts for hydrogen generation from aqueous solution of ammonia borane (NH 3 BH 3 , AB) at room temperature . It is found that the as-synthesized NiM NPs (M = Cr, Mo, W) exhibit much higher catalytic performance for the hydrolysis of AB as compared to that of pure Ni NPs. In addition, among all the Ni 1-x M x (M = Cr, Mo, W) NPs, the Ni 0.9 Cr 0.1 , Ni 0.9 Mo 0.1 , and Ni 0.8 W 0.2 NPs show the highest catalytic activities with the turnover frequency (TOF) values of 10.7, 27.3 and 25.0 mol H 2 (mol metal min) −1 , respectively. Remarkably, these optimized NiM catalysts can also perform efficiently in the hydrolysis of hydrazine borane (N 2 H 4 BH 3 , HB). The present low-cost and high-performance of the NiM catalysts system may encourage the practical application of AB and HB as the promising chemical hydrogen storage materials .
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
MEDICAL ONCOLOGY
·
2024
·Vol. 41
·期 5
·1-5
·
IF 2.8
Chen Jiejian,Li Yonghao,Gan Xiaoning,Weng Chengyin,Fang Xisheng,Liu Guolong
It has been proposed that boron neutron capture therapy (BNCT) holds promise as a treatment modality for melanoma. However, the effectiveness of boron agents in delivery remains a critical issue to be addressed for BNCT. To this end, phenylboronic acid, which exhibits good water solubility and low cytotoxicity similar to BPA, has been investigated as a potential nuclear-targeting boron agent. The boron concentration of phenylboronic acid was found to be 74.47 ± 12.17 ng/10 6 B16F10 cells and 45.77 ± 5.64 ng/10 6 cells in the nuclei. Molecular docking experiments were conducted to investigate the binding of phenylboronic acid to importin proteins involved in nuclear transport. The potential of phenylboronic acid to serve as a desirable nucleus-delivery boron agent for neutron capture therapy in melanoma warrants further exploration.
研究领域:
肿瘤学
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药理学
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核医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Analytical Methods in Chemistry
·
2019
·
IF 1.589
Xiaoxia Liu,Miaomiao Tian,Wenmei Gao,Jinzhong Zhao
An efficient, sensitive, and low-cost method has been developed for turn-on fluorescence sensing of dopamine (DA). The method relies on the rapid reaction of DA and 3-Hydroxyphenylboronic acid (3-HPBA) via specific recognition between boronic acids and cis-diol of DA in alkaline solution. The reaction product shows an excitation wavelength of 417 nm and the maximum emission peak at 470 nm. The proposed method allows the determination of DA in the range of 50 nM–25 μM, and the whole detection can be completed within 5 minutes. Furthermore, the presented approach has good selectivity and has been successfully applied to DA sensing in human serum samples, showing great potential in clinical diagnosis.
研究领域:
分析化学
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生物医学
·
临床诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Kai Zhang,Pan Xue,Jianghua Wu,Liyun Wu,Nanyang Wang,Tao Xu,Kaiping Zhu,Jun Pu,Qiulong Li,Yu Deng,Yagang Yao,Jin Zhang
Compared to other synthetic methods, the synthesis of boron nitride nanotubes (BNNTs) by the boron oxide chemical vapor deposition (BOCVD) method can balance the purity and quality of the product nanotubes. However, due to the solid reaction characteristics of boron monomers, the closed reaction system, and the synthesis temperature of over 1000 °C, growth studies of BNNTs have been in a dilemma. To this end, simultaneous thermal analysis combined with multi-atmosphere annealing experiments at corresponding temperatures is used to study the inorganic solid-state reaction of the classical BOCVD precursor B/Li2O in real time and confirmed by experimental results that lithium borate is the actual active component and catalyst. Further experiments reveal that the growth process of BNNTs and lithium borate not only consumes less of the precursor and ammonia but is also flexible in its configuration, showing exceptional efficiency and reactivity. Lastly, experiments have shown that the structure and activity of borate are equally applicable to alkali metals, alkaline earth metal, and transition metals.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yi Zhou,Asad Ali Shah Zaidi,Xiaofen Yuan,Rui Shi,Yana Liu,Jiguang Zhang,Yunfeng Zhu,Jun Wang
Developing formic acid (FA) as a promising hydrogen (H 2 ) carrier relies on the exploration of efficient dehydrogenation catalyst. In this work, well-dispersed Pd-B x nanoparticles on XC-72 carbon were synthesized and investigated for FA dehydrogenation, wherein the B doping content can be varied by changing solvothermal temperature, B source concentration, and reaction time. With sodium formate as the additive, the optimized Pd–B 0.2 /C exhibits a low apparent activation energy of 27.6 kJ mol −1 for FA dehydrogenation, enabling the CO-free H 2 production with a high initial turnover frequency of 1146 h −1 and a H 2 generation rate of 315.79 L h −1 g Pd −1 at 343 K. System investigations suggest that the strain and electronic effects induced by B doping collaboratively contribute to the superior catalytic activity by promoting the dissociation of the O–H bond in FA molecule and weakening the possible CO adsorption.
研究领域:
催化化学
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能源材料科学
✓ 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）