Energetic Materials Frontiers
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2023
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IF 0
Yu-shu Xiong,Yong-qi Wang,Chong Wan,Wen-zhen Zhang,Zhao Qin,Su-hang Chen,Kang-zhen Xu
To overcome the agglomeration and insufficient combustion of nano-boron (n-B) powders, this study successfully prepared two novel types of boron-based nanocomposites using the acoustic resonance technology, namely high-substitute nitrochitosan/nano-boron (NCh-B) with ratios of 1:3, 1:5, 1:7 and 1:9, and nitrochitosan/nano-boron powder/nano-titanium (NCh-B-Ti) with Ti contents of 5 wt%, 10 wt%, 15 wt% and 20 wt%. The structural morphologies, laser ignition and combustion properties of the composites were systematically investigated. The results suggest that the addition of NCh can significantly improve the dispersion of n-B. NCh-B exhibited a higher combustion performance than n-B, as evidenced by their ignition delay and flame areas. When the laser power density was 81 W, NCh-B 5 -Ti 15% exhibited a combustion time and an ignition delay of 240 ms and 5.5 ms respectively, which were higher and lower than those of NCh-B 5 (199 ms and 17 ms, respectively). Furthermore, NCh-B 5 -Ti 15% displayed a lower ignition delay than both n-B powders (12 ms) and NCh-B (11 ms), as well as brighter flames and a larger combustion area. Therefore, the addition of n-Ti can promote the combustion of n-B powders, with the combustion products of NCh-B-Ti including H 3 BO 3 , B 2 O 3 , TiB 2 , and TiO. This study provides a new method for improving the ignition performance and combustion efficiency of n-B powders.
研究领域:
材料科学
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燃烧学
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DOI
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 1
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IF 1.866
Zhaowei Wang,Zhixia Wen,Xing Li,Junwei Yu,Xiaoxuan Liu
The preparation of the high cis −1,4-polyisoprene by Ziegler-Natta catalysis system was studied. The effect of Al-Ti catalysts modified by ethers with different structures which are different electron donor reagent on polymerization of isoprene has been mainly investigated. By the measurement method of the monomer conversion, FTIR, and 1 H NMR spectroscopy, the influence of, respectively, added diphenyl ether, anisole, dibutyl ether, or methyl tert -butyl methyl ether as a third active component on the heterogeneous TiCl 4 -Al( i -Bu) 3 -ether catalyst activity and microstructure of synthetic polyisoprene was analyzed. By the adding of diphenyl ether or dibutyl ether, the process of prefabricated heterogeneous catalyst is quickly and catalyst particle quantity is large. The polymerization conversion is high and the microstructure cis −1,4 content of the resulting polymer can reach 92%. But Al( i -Bu) 3 added anisole or methyl tert -butyl methyl ether hard to cooperate with TiCl 4 . © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44357.
研究领域:
高分子化学
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催化化学
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功能材料
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合成高分子
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配位聚合
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DOI
高影响因子
FUEL
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2014
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IF 3.406
Shuai Liu,Wei Zhou,Tao Yu,Ruijie Chai,Liming Lu,Renhe Yin
Layered nanoporous Ti/TiO 2 /Ni–W–B electrode is prepared through electrochemical anodization and electrodeposition for electrocatalytic reduction of coal. Extensive characterizations of the layered nanoporous Ti/TiO 2 /Ni–W–B electrode have been performed using techniques including scanning electronic microscopy, X-ray diffraction, inductively coupled plasma, Brunauer–Emmett–Teller and linear sweep voltammetry. The results indicate that the electrode, which presents layered nanoporous surface network, exhibits high activity for the reduction of coal. In an organic electrolyte system, a liquefaction yield of 51.8% is obtained after electrolysis of coal on the prepared electrode for 24 h at −1.7 V. The electroreduction mechanism of coal is also investigated. IR and 1 H nuclear magnetic resonance results show that active hydrogen (H ∗ ) reacts with functional groups in the coal such as C O, C O and C C, leading to the reduction of unsaturated bonds and the breakage of bridge bonds and part of aromatic rings during the electroreduction of coal.
研究领域:
材料科学
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电化学
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能源化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2021
·
IF 3.871
Weiqiang Hu,Zongqing Ma,Zhu Qian,Jin Wu,Ji Dong,Hui Wang,Yongchang Liu
The Mo based alloys with minor Ti additive were fabricated by successive processes of simple ball-milling and low-temperature sintering. Different from traditional titanium oxides additive, the minor Ti additive will adsorb nearby oxygen impurities to form TiO 2 or Ti 8 O 15 during above process, thus purifying Mo matrix. The size of formed titanium oxides (approximately 540 nm) is also close to that reported in relevant literatures. What's more, the Ti additive could availably refine the Mo powder particles during ball-milling process and improve its sintering activity. While maintaining high densit (> 99%), the sintered Mo based alloys with minor Ti additive possess finer grain (13.17 μm → 4.44 μm) and higher hardness (249 HV 0.2 → 332 HV 0.2 ) compared with pure Mo.
研究领域:
材料科学
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冶金学
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机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2026
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IF 6
Jia Wang,Zeru Wang,Chuanyao Dong,Kan Zhang
Titanium alloys are widely used in lightweight mechanical components, but their limited mechanical and tribological properties often lead to failure under service conditions. In this study, a titanium-based micro-arc oxidation (Ti-MAO) composite coating was developed by incorporating hexagonal boron nitride (h-BN) while optimizing electrolyte composition and process parameters. Proper control of h-BN content effectively improved the high-temperature oxidation resistance and tribological properties of the Ti-MAO coating. The research results showed that h-BN could regulate the energy distribution during MAO discharge, promote coating densification, and reduce structural defects. At a concentration of 4 g/L, h-BN maintained good dispersibility. Compared with an additive-free Ti-MAO coating, the h-BN/Ti-MAO composite coating showed an 86% reduction in the oxidation rate constant at 600 °C. Due to the stable layered structure of h-BN over a wide temperature range, the composite coating maintained a friction coefficient (COF) below 0.31 from room temperature (RT) to 500 °C, reduced to below 0.21 within 300 °C. However, excessive h-BN led to particle aggregation and a decline in overall coating performance. In summary, this approach enhances the durability of titanium alloy components through improved oxidation resistance and tribological properties.
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高影响因子
Metals
·
2023
·Vol. 13
·期 2
·264
·
IF 2.9
Dongdong He,Hui Wang,Weidong Huang,Xinxi Chen,Guofu Lian,Yu Wang
In this study, TiB + La2O3/Ti-6Al-4V composites were successfully prepared by in situ reaction using selective laser melting technology. The effect of LaB6content on the fabrication quality, microstructure evolution and mechanical properties of the composite samples was investigated. The results show that the relative density of the sample gradually decreased from 98.56% to 96.57% as LaB6content increased from 0 wt% to 3 wt%. With increasing LaB6content, TiB precipitates gradually aggregated and grew from a discrete needle-like structure to a dendritic structure, before eventually developing a cell-like structure. The dislocations piled up around the TiB and La2O3reinforcements, which impeded the motion of the dislocations and led to the enhancement of the tensile strength of the samples. Different from the addition of a single reinforcement due to the combined strengthening effect of the micrometer-scale and nanoscale reinforcements, the strength of the samples was increased significantly. The Ti-6Al-4V sample with 3 wt% LaB6addition showed the most significant strengthening effect. Compared to the pure Ti-6Al-4V sample, the 3 wt% LaB6addition sample gained a 35.71% increase in hardness and a 14.5% increase in tensile strength. Additionally, wear volume was reduced by 47.5%. The results revealed that the addition of LaB6was a potential way to improve the mechanical performance of the titanium alloys in the additive manufacturing process.
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2022
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IF 3.754
Hao Hu,Jiacheng Jin,Mingchen Xu,Chengdong Xu,Yue Cheng,Weiwei Ji,Zhencen Ding,Min Shao,Yushan Wan
The present work demonstrates the synthesis of the microsphere composite photocatalyst Bi 3 O 4 Br/NH 2 -MIL-125(Ti) (BOB/NMILT) system, and the physicochemical properties of the material were analyzed by various characterization means. Further, the photocatalytic performance of the BOB/NMILT system was evaluated by degrading tetracycline (TC) under simulated sunlight. The degradation rate of TC using BOB/NMILT-5 reached 88.5% within 90 min. The degradation rate is 6.5 times and 3 times higher than that of individual catalysts NH 2 -MIL-125(Ti) (NMILT) and Bi 3 O 4 Br, respectively. The improvement in photocatalytic activity of composites mainly benefited from the construction of heterojunctions , which effectively inhibited the recombination of carriers. Importantly, the role of h + and •O 2 − was found to be significant in the reaction of TC. Cumulatively, a Z-scheme photocatalytic degradation mechanism of tetracycline on the BOB/NMILT composite system was proposed. The proposal of this system is of great significance for the future development of photocatalytic materials that can degrade tetracycline.
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DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 2
·264
·
IF 2.7
Zhenying Chen,Xiuqing Cao,Yuyang Huang,Shuang Zhang,Wenjian Pan,Wen Deng
Ti-doped ZnO (TZO) and Bi2O3thin films were designed and deposited by magnetron sputtering successively on ITO glass substrate to form a Ti-doped ZnO/Bi2O3(TZO/Bi2O3) heterojunction. Microstructure and photoelectric properties of TZO, Bi2O3, and TZO/Bi2O3films were tested and characterized. The results showed that TZO film with a hexagonal wurtzite structure was preferentially grown along the crystal plane (002), had a good crystallization state, and was an N-type semiconductor film with high transmittance (90%) and low resistivity (4.68 × 10−3Ω·cm). However, the Bi2O3film sputtered in an oxygen-containing atmosphere and was a polycrystalline film that was preferentially grown along the crystal plane (111). It had a lower crystallization quality than TZO film and was a P-type semiconductor film with low transmittance (68%) and high resistance (1.71 × 102Ω·cm). The I–V curve of TZO/Bi2O3composite films showed that it had an obvious heterojunction rectification effect, which indicates that the PN heterojunction successfully formed in TZO/Bi2O3films.Keywords:TZO film;Bi2O3film;TZO/Bi2O3heterojunction;magnetron sputtering;optoelectronic properties
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高影响因子
Journal of Water Process Engineering
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2022
·
IF 7.34
Jian Zhang,Yue Zhao,Maoxin Yang,Hong Jiang,Bing Wang,Yanping Jia,Weihua He
The abuse of doxycycline hydrochloride (DOX) in animal husbandry and its incomplete treatment have led to serious environmental problems, especially the risk of bacterial resistance. As an efficient, simple, and non-polluting method of catalysis, electrocatalysis has many advantages, which has attracted extensive attention in the removal of antibiotic pollutants in wastewater. Hence, the Ni/MWCNTs-OH/Ti composite electrode was prepared by galvanostatic electrodeposition to electrocatalyze DOX, and then the electrode was observed and analyzed by SEM , XRD and XPS. The optimal conditions (MWCNTs-OH was 0.10 mg/L, the concentration of NiSO 4 was 75 mmol/L, the degradation current was 15 mA, NaCl was present at a concentration of 0.20 mol/L, and pH value of 4) for degradation of 30 mg/L DOX within 60 min were determined by controlling variables. The degradation process of DOX followed Langmuir-Hinshelwood quasi-first-order reaction kinetics. As a result of stable the electrode, DOX removal rate was consistently above 70 % after 10 continuous uses, which showed good stability and reusability. The composite electrode electrocatalyzed DOX under the synergistic effect of cathode and anode. To identify the main intermediates involved in the electrochemical degradation of DOX, LC-MS was used. The toxicity of the intermediate products and final products was compared and analyzed by microbial culture experiment. And then Ecosar 2.2 was used to predict the biotoxicity of main intermediates to fish, daphnid, and green algae . This work provides a new material for the environmental remediation of antibiotic pollution.
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DOI
高影响因子
Journal of Energy Storage
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2022
·
IF 8.907
Xiaolin Sun,Kai Zhao,Zhiqiang Liu,Zhonghan Feng,Zihao Wang,Liang Cui,Jingquan Liu
The construction of cost-effective, efficient, and sustainable energy storage systems is extremely important for future fuels globally. Nickel borates display important characteristics in electrochemical catalytic applications, whereas few reports have focused on their energy storage properties in supercapacitors . Herein, Ni 3 (BO 3 ) 2 nanospheres (NSs) are fabricated on titanium (Ti) mesh to afford Ni 3 (BO 3 ) 2 NSs@Ti using a simple and scalable electrodeposition technique, whose electrochemical performance is carefully studied. The Ni 3 (BO 3 ) 2 NSs@Ti obtained at 1.2 V (Ni 3 (BO 3 ) 2 NSs-1.2V) exhibits a higher specific capacitance of 663 F g −1 with a current density of 0.5 A g −1 . Furthermore, by directly employing Ni 3 (BO 3 ) 2 NSs-1.2V as the positive electrode and activated carbon as the negative electrode , an asymmetric supercapacitor (ASC) device can be fabricated and displays the energy density up to 30.6 Wh kg −1 at the power density of 400 W kg −1 . Hence, the facile electrodeposited Ni 3 (BO 3 ) 2 NSs can be a potential platform for energy storage applications .
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
·
IF 7.926
Chunying Dong,Yuang Pang,Yan Chen,Zhan Gao,Meiqiang Cai,Micong Jin,Zongsu Wei
Sludge based catalysts (SBCs) has been considered as a promising and viable approach to sludge reclamation. Herein, we fabricated bimetallic Fe-Ti doped SBCs via a facile synthesis with sludge containing polyacrylamide (PAM) as N-precursor. The adsorption capacity and degradation efficiency of as-synthesized SBCs were assessed using tetracycline (TC) as a target pollutant, in which PAM in sludge played a dual role by promoting porosity, active sites, and structural defects beneficial for persulfate (PS) activation. Fe-Ti doping induced the activation of PS by a fast redox cycle of Fe 3+ /Fe 2+ associated with the coexistence of Ti 4+ /Ti 3+ , which enabled an efficient electron transfer between the catalyst and PS. The synergistic effect of PAM-derived N doping and Fe-Ti bimetals resulted in prevention of iron leaching and enhanced catalyst stability over a wide pH range. The surface SO 4 •− was the primary oxidant in the TC degradation process based on free-radical quenching experiments, and degradation pathways of TC were proposed given the intermediate evidence from UPLC-HRMS analysis. This study promotes the reclamation of PAM-containing sludge providing an eco-friendly and efficient process to activate PS for wastewater treatments .
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Zhen Huang,Chao Xiong,Lingri Ying,Welong Wang,Shixing Wang,Jing Ding,Jianfeng Lu
Lead ions in water have notorious effects on humans and environment. It is important to design an adsorbent with high adsorption capacity and reproducibility for efficiently removing Pb (II)ions from polluted water. Here, a novel Ti-based MOFs material (BDB-MIL-125(Ti)@Fe 3 O 4 ) was prepared by modifying NH 2 -MIL-125(Ti) with sulfhydryl and amino groups. Due to the large number of active sites, the maximum Pb (II) adsorption capacity of BDB-MIL-125(Ti)@Fe 3 O 4 was 710.79 mg/g at 25 °C and pH = 6 within 120 min corresponding to a maximum removal rate of 95.68%. The adsorbent also has extremely high selectivity and good cycling adsorption performance. The adsorption isotherms and kinetics agree with the Langmuir and the pseudo-second-order models, indicating that the process was chemisorption . Thermodynamic studies prove that spontaneous processes enhance Pb (II) adsorption at higher temperatures. DFT and FMOs calculations were used to discuss the adsorption mechanism. The sulfhydryl groups on the surface of organic ligands have a stronger affinity for Pb (II).
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DOI
PubMed
高影响因子
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