SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shaolong Li,Yusi Che,Jianxun Song,Yongchun Shu,Jilin He,Baoqiang Xu,Bin Yang
A single phase zirconium oxycarbonitride was prepared through a carbothermal reduction route at 1600 °C in nitrogen atmosphere using ZrO 2 and graphite powder as raw materials. The hot-pressed zirconium oxycarbonitride block has good stability in the NaCl-KCl melt. The anodic dissolution behavior of zirconium oxycarbonitride and the reduction mechanism of zirconium ion in NaCl-KCl melt were studied by linear sweep voltammetry, electrochemical impedance spectroscopy, cyclic voltammetry and square wave voltammetry. The results show that zirconium in the anode is oxidized to Zr 2+ ions and dissolved in the molten salt. The zirconium ions diffuse to the cathode and are reduced to zirconium metal by transferring two electrons in one step. Potentiostatic electrolysis at −2.9 V was performed between a Mo rod cathode and ZrC x O y N z anode. The cathode product was detected to be zirconium metal, which indicated that zirconium oxycarbonitride was a suitable consumable anode for the electrolytic preparation of zirconium metal.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Xi-Fei Ma,Xiao Huang,Zhuang Kang,Guo-Jun Zhang,Hongjie Luo
Due to the extremely harsh reaction conditions, it is very difficult to control the particle morphology during the synthesis of ZrC , a well-known ultra high temperature ceramic material. In this paper, carbon encapsulated zirconia microspheres (ZrO 2 @C) are synthesized via two consecutive hydrothermal reactions in one pot. After carbothermal reduction, ZrC particles with controlled spherical morphology can be prepared. The spherical morphology suggests that carbon diffuses into zirconia during carbothermal reduction. The influences of reactant concentrations, reaction time and temperature on the microencapsulation process are also investigated. Meanwhile, as a comparison, zirconia coated carbon microspheres (C@ZrO 2 ) are also prepared, which results in ZrC particles with layered structure.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Shijiao Zhao,Jing Song,Rui Xu,Lei Nie,Jingtao Ma,Changsheng Deng,Xing Cheng,Xingyu Zhao,Shaochang Hao,Jianjun Li
In this study, zirconium nitride nanopowders with a high specific surface area were synthesized by carbothermal nitridation with fructose as a double-function additive. The precursor was prepared by an internal gelation process. The first function of fructose was to act as an organic carbon source for the nitridation reaction to decrease the apparent activation energy . The second function of fructose was to act as a microstructural controller of products to obtain a high specific surface area of 315.7 m 2 /g. The effects of temperature on the phase composition, chemical elements, morphology and specific surface area were investigated. The microstructure development upon heating was illustrated and the relationship between the structure evolution and variation in the specific surface area was elucidated. This method with fructose as a water-soluble organic additive could be expanded to prepare transition metal nitrides with a high specific surface area.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 95
·期 2
·398-407
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IF 2.008
Zhao Shijiao,Xu Rui,Ma Jingtao,Lin Xuping,Cheng Xing,Zhao Xingyu,Hao Shaochang,Deng Changsheng
Zirconium nitride microspheres with uniform size of ~680 μm, good sphericity, and good integrity were prepared by internal gelation process and two-step nitridation. The effects of carbon black and temperature on stability of sol were investigated. Induction of carbon black decreased stability of sol but the amount of carbon black added has little effect on the sol stability. Increasing temperature linearly decreased the stable time of the sol. Sol with stable time of up to 1 h, which was adequate for casting of liquid spheres was achieved at 11.0 °C, a significant increase from conventional 4.0 °C. Two-step nitridation was developed to prepare crack-free ceramic microspheres with high relative nitride phase content. The special microstructure on surface and cross section of microspheres reveals stepped-growth of nitride crystals.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·Vol. 44
·期 7
·8710-8715
·
IF 3.057
Yang Chen,Chengji Deng,Chao Yu,Jun Ding,Hongxi Zhu
ZrN nanopowders were obtained by using ZrO 2 and Mg as the main raw materials in a molten salt environment and a high-purity nitrogen atmosphere. The effects of ZrO 2 / Mg mole ratio, nitriding temperature , and holding time on the synthesis of ZrN were investigated. ZrN was formed at 700 °C for 3 h. When the nitriding temperature increased to 1000 °C, pure phase ZrN was formed. The specific surface area of ZrN was 20.92 m 2 /g. When the temperature rose to 1100 °C, the resulting ZrN particles were finer; the average size of ZrN decreased from 71.60 to 49.65 nm. Further, an excessively long holding time led to evaporation of the molten salt, ZrO 2 , which was not fully nitrided. Finally, a possible formation mechanism of ZrN is proposed.
研究领域:
材料科学
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无机化学
·
纳米材料
·
高温合成
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Shijiao Zhao,Rui Xu,Jingtao Ma,Changsheng Deng,Xing Cheng,Xingyu Zhao,Shaochang Hao,Jianjun Li
Zirconium nitride is an increasingly attractive material, owning to its wide range of applications. Nitridation with carbon as a reductant is a commonly used process for the preparation of transition metal nitrides. In this study, the nitridation of carbon-containing zirconia gels was studied as a method to synthesize zirconium nitride. The behavior of the gel upon heat treatment was investigated online. The evolution of the microstructure during nitridation was investigated using high-resolution transmission electron microscopy (HRTEM). The relationships between the gaseous species, crystalline phases, microstructure, and chemical elements of the resulting materials were established. The results showed that NH 3 , CH 2 O, CO 2 , CO, H 2 O, and HCN were the gaseous products in the nitridation process. Nucleation of the nanograins started with zirconium oxynitride . Transformation from oxynitride to nitride led to the occurrence of open-mouth-like defects on the particles. The enrichment of N atoms was accompanied by a core-shell structure. Finally, a systematic nitridation mechanism involving five stages was proposed. This study is important for understanding the nitridation process and controlling the structure and properties of transition metal nitrides.
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
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-9
·
IF 4.011
Zhao Shijiao,Ma Jingtao,Xu Rui,Lin Xuping,Cheng Xing,Hao Shaochang,Zhao Xingyu,Deng Changsheng,Liu Bing
Zirconium compounds has been widely attention over the last decades due to its excellent physical and chemical properties. Zirconium nitride nanopowders were synthesized via a simple direct carbothermic nitridation process of internal gel derived zirconia in the presence of nano-sized carbon black. The effects of reaction temperature, dwell time and molar ratio of carbon black to Zr (C/Zr) on the phase composition, grain size and crystal parameters of products were studied. Based upon the analysis of crystallite phase evolution and microstructure characterization, it was found that zirconium oxynitride is intermediate product and then O atoms in oxynitride were extracted by oxygen getter, carbon black. Anion sites were directly replaced by N atoms to form rock-salt type nitride in carbothermic nitridation process.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 21
·1-15
·
IF 2.8
Lu Jiaqi,Li Runkang,Cui Yi,Wang Ronglin,Lv Dongfeng,Wei Yingna,Chen Yuejun,Wei Hengyong,Bu Jinglong
Zirconium nitride nanofibers were synthesized by electrospinning method combined with carbon thermal reduction nitridation process, with zirconium chloride octahydrate and polyvinylpyrrolidone as raw materials. The phase composition, morphology and pore structure of the as-prepared nanofibers were analyzed by XRD, XPS, SEM, TEM and BET. In addition, the microwave absorption properties were measured using transmission line theory utilizing a vector network analyzer of zirconium nitride nanofibers/paraffin composites with different filler loadings. The results show that the as-prepared nanofibers are ZrN phase. The zirconium nitride nanofibers contain residual oxygen and carbon to form Zr(N,C,O) solid solution. The average diameter of the nanofibers is approximately 300 nm. There are particles distributed in it and the particle size ranges from 100 to 200 nm. The specific surface area of zirconium nitride nanofibers is 176.7 m 2 /g, and their pore volume is 0.26 cc/g. The pore sizes are mainly distributed at 3 nm. The granular structure and abundant pores of zirconium nitride nanofibers provide suitable conditions for impedance matching, interfacial polarization, multiple reflections, and scattering. These nanofibers exhibit excellent microwave absorption performance, achieving an optimum reflection loss of − 55.11 dB at a thickness of 1.55 mm with an effective absorption bandwidth of 3.51 GHz when the filler loading is 35 wt%. This study suggests that zirconium nitride nanofibers with good microwave absorption performance have the potential as novel transition metal nitride microwave absorption candidate materials.
研究领域:
材料科学
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纳米技术
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微波吸收材料
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陶瓷
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电磁功能材料
✓ 已验证
DOI
高影响因子
NATURE MATERIALS
·
2019
·Vol. 19
·期 3
·282-286
·
IF 38.887
Yuan Yao,Wang Jiacheng,Adimi Samira,Shen Hangjia,Thomas Tiju,Ma Ruguang,Attfield J. Paul,Yang Minghui
Platinum (Pt)-based materials are important components of microelectronic sensors, anticancer drugs, automotive catalytic converters and electrochemical energy conversion devices 1 . Pt is currently the most common catalyst used for the oxygen reduction reaction (ORR) in devices such as fuel cells and metal–air batteries 2 , 3 , although a scalable use is restricted by the scarcity, cost and vulnerability to poisoning of Pt (refs 4 , 5 , 6 ). Here we show that nanoparticulate zirconium nitride (ZrN) can replace and even surpass Pt as a catalyst for ORR in alkaline environments. As-synthesized ZrN nanoparticles (NPs) exhibit a high oxygen reduction performance with the same activity as that of a widely used Pt-on-carbon (Pt/C) commercial catalyst. Both materials show the same half-wave potential ( E 1/2 = 0.80 V) and ZrN has a higher stability (Δ E 1/2 = −3 mV) than the Pt/C catalyst (Δ E 1/2 = −39 mV) after 1,000 ORR cycles in 0.1 M KOH. ZrN is also shown to deliver a greater power density and cyclability than Pt/C in a zinc–air battery. Replacement of Pt by ZrN is likely to reduce costs and promote the usage of electrochemical energy devices, and ZrN may also be useful in other catalytic systems.
研究领域:
材料科学
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电化学
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催化
·
能源存储
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2026
·
IF 3.3
Siyao Wang,Shuhan Lu,Yan Gao,Xiang Gong,Tao Fang
With the ever-growing research intereset in hydrogen storage materials, rationally designing suitable catalysts for ammonia borane (AB) hydrolysis and clarifying the catalytic mechanism remain essential and challenging. Herein, Ru, Pt and Pd were supported on the carriers with varying N contents via impregnation reduction with NaBH4. Kinetc isotope effect studies and a series of characterization methods were applied to explore the dehydrogenation mechanism, revealing that the cleavage of O-H in water is the rate-determining step (RDS) of the reaction. Owing to their electronic and anchoring effects, Ru-based catalysts exhibit high catalytic activity in AB dehydrogenation. Specifically, the optimal Ru/ZrN with an average particle size of 1.4 nm exhibits remarkable hydrogen evolution activity and turnover frequency (TOF=305.3 min-1) under ambient conditions, superior to the corresponding monometallic counterparts (i.e., Pd/ZrN and Pt/ZrN) and many previous reports. Apart from satisfactory durability, the optimal catalyst exhibits a remarkably low apparent activation energy (31.48 kJ/mol). This work elucidates how support nitrogen contents modulate the metal-support electronic interaction, thereby providing a strategy for designing high-performance catalysts and filling a knowledge gap in AB dehydrogenation mechanisms.
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产品关联
DOI
高影响因子
Food Packaging and Shelf Life
·
2025
·
IF 10.6
Yanqing Li,Xuchen Li,Shaomei Li,Jiao Li,Xiang Zou,Hongwei Zhan,Guanyuan Qu,Lixiu Zhang,Yongjun Sun,Wenming Ju,Mengqi Ye,Pengdong Sun,Jingyuan Li,Yang Deng,Ting Ding
Aeromonas sobria , recognized as a psychrotrophic specific spoilage organism in refrigerated aquatic products, facilitates its proliferation by metabolizing proteins, lipids, and carbohydrates, thereby generating spoilage-associated metabolites and compromising product quality. Quorum sensing (QS), a bacterial cell-to-cell communication mechanism, orchestrates the secretion of virulence and spoilage factors in A. sobria via the LuxI/R QS system. Targeting this regulatory pathway presents a novel strategy to mitigate spoilage and extend the shelf life of aquatic products. Previous studies have demonstrated that zingerone (ZRN) exhibits quorum-quenching activity at sub-inhibitory concentrations; however, its practical application is constrained by limited solubility and bioavailability. To overcome these challenges, ZRN was encapsulated within halloysite nanotubes (HNTs) and incorporated into a self-assembled composite film composed of chitosan (CS) and sodium carboxymethyl cellulose (CMC-Na). The fabricated film was characterized for its structural, thermal, and mechanical properties and subsequently evaluated for its preservation efficacy on refrigerated perch fillets. The composite film exhibited a homogeneous surface morphology with uniformly dispersed HNTs, alongside adequate thermal stability, tensile strength, and physicochemical attributes suitable for refrigerated aquatic product preservation. Notably, the film suppressed spoilage indicators, including total volatile basic nitrogen (TVB-N) accumulation, lipid peroxidation, and bacterial spoilage potential, without inhibiting A. sobria growth. Furthermore, it mitigated muscle tissue degradation and biogenic amine formation in perch fillets during refrigerated storage. Molecular docking simulations revealed that ZRN competitively binds to the LuxR-type receptor at the same binding pocket as the endogenous autoinducer C 4 -HSL, thereby disrupting QS signaling. Collectively, this ZRN-loaded composite film represents a promising biodegradable packaging solution for enhancing the quality and shelf life of refrigerated aquatic foods.
研究领域:
食品微生物学
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食品保鲜
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纳米技术
·
细菌通讯
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材料科学
·
水产品加工
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Bin Wang,Shu-han Lu,Shi-yuan Wang,Pei-ya Li,Tao Fang
N -ethylcarbazole (NEC) is a widely studied liquid organic hydrogen carrier, and a large number of catalysts with excellent reactivity has been designed and developed thus far. However, the phenomenon of isomeric transformation of 12H-NEC products during the reaction was not explained. Here, we studied the process based on three different Ru catalysts supported on zirconium-based supports, and based on the experimental results, we identified that supported metal-support strong interaction (SMSI), metal-support anion interaction (MSAI) and hydrogen spillover will have coupling effect on the hydrogenation reaction path and the occurrence of isomerization in 12H-NEC product. Higher 12 [H] B content in 12H-NEC under Ru/ZrN catalyst was caused by the large number of secondary active centers on the surface of the support reacting in the hydrogenation reaction. The active site for the isomerization of 12 [H] B to 12 [H] A may be the electronegativity interface formed by Ru and the support, while the electroneutral or electropositive interface rich in hydrogen is not conducive to the catalytic conversion. To sum up, an image model for the isomeric transformation of 12H-NEC products was proposed.
研究领域:
催化
·
化学工程
·
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）