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Al_(4)SiC_(4)陶瓷在高温还原性气氛中的结构演变及机理研究

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陶瓷学报 2024年第1期45卷 103-108页

作者：郑岐孙侨阳于景坤袁磊中民驰远实业有限公司辽宁大石桥115100 东北大学冶金学院辽宁沈阳110819

碳化硅铝是一种良好的含碳耐火材料抗氧化剂。该研究以铝粉、硅粉和碳粉为原料制备出碳化硅铝陶瓷,并将其置于1000℃~1500℃温度范围内的还原气氛中,以模拟碳化硅铝在含碳耐火材料中的实际使用环境并对其性能和反应机理进行了研究。研... 详细信息

碳化硅铝是一种良好的含碳耐火材料抗氧化剂。该研究以铝粉、硅粉和碳粉为原料制备出碳化硅铝陶瓷,并将其置于1000℃~1500℃温度范围内的还原气氛中,以模拟碳化硅铝在含碳耐火材料中的实际使用环境并对其性能和反应机理进行了研究。研究结果表明,在还原性气氛下,碳化硅铝在1000℃~1400℃温度范围内先与一氧化碳通过气相反应生成氧化铝、碳化硅、碳及铝硅酸盐玻璃相。当温度升至1500℃时,氧化铝和碳化硅与一氧化碳通过气相反应生成莫来石。上述反应将会在含碳耐火材料表面形成保护膜,阻止含碳耐火材料的氧化,提高了含碳耐火材料的抗氧化性。

关键词： Al_(4)SiC_(4) 含碳耐火材料抗氧化性还原反应

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二步烧结法制备锆酸钙材料的研究

耐火材料 2024年第3期58卷 204-207页

作者：王猛温淑华于景坤袁磊温天朋东北大学冶金学院辽宁沈阳110819 成都国营锦江机器厂四川成都610000

为提高锆酸钙材料的致密度,以碳酸钙和氧化锆为原料,采用预烧—破碎—压制成型—高温烧成的二步烧结法制备了锆酸钙(CaZrO_(3))材料,主要研究预烧温度(分别为1200、1300、1400、1500℃)对CaZrO_(3)材料显微结构和常温性能的影响。结果表... 详细信息

为提高锆酸钙材料的致密度,以碳酸钙和氧化锆为原料,采用预烧—破碎—压制成型—高温烧成的二步烧结法制备了锆酸钙(CaZrO_(3))材料,主要研究预烧温度(分别为1200、1300、1400、1500℃)对CaZrO_(3)材料显微结构和常温性能的影响。结果表明:1)采取二步烧结法能使原料分布均匀,反应彻底,避免了氧化锆相变导致的试样膨胀开裂;2)预烧温度为1400℃时,试样的综合性能最优,主晶相CaZrO_(3)可达99%(w),平均晶粒尺寸为4~5μm,显气孔率为1.6%,体积密度为4.40 g·cm^(-3),常温耐压强度为590 MPa。

关键词：锆酸钙预烧温度二步烧结法致密度线收缩率常温耐压强度

A novel P-doped and NCDs loaded g-C_(3)N_(4) with enhanced charges separation for photocatalytic hydrogen evolution

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Chinese Chemical Letters 2023年第4期34卷 172-177页

作者： Shuaiyang Zhang Yan Yang yunpu Zhai Jiaqi Wen Meng Zhang jingkun yu Siyu Lu Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China

Graphite carbon nitride(g-C_(3)N_(4)) is a promising non-metal photocatalyst for photocatalytic hydrogen production, but its performance is still limited due to sluggish charges separation and low utilization of *** this work, P-doped and N-doped carbon dots(NCDs) supported g-C_(3)N_(4)were successfully prepared via hydrothermal and polymerization reactions. The sub-bandgap formed by P-doping enhances the utilization of visible light, and the high electron density of P sites is conducive to the trapping of holes. NCDs also improve light utilization and, more importantly, act as electron acceptors and transporters to promote electron transport. The built-in electric field formed by the synergy of P-doping and NCDs-loading greatly promotes the separation of charges. The PCN/NCDs showed a significantly improved hydrogen evolution activity of 3731 μmol h^(-1)g^(-1), which was 6.7 times that of pure carbon nitride(560 μmol h^(-1)g^(-1)). This strategy may be generalized to the design of g-C_(3)N_(4)-based photocatalysts, facilitating the separation of charges for enhanced catalytic activity.

关键词： g-C_(3)N_(4) N-doped carbon dots P-doping Photocatalyst Hydrogen evolution

Single stain hyperspectral imaging for accurate fungal pathogens identification and quantification

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Nano Research 2022年第7期15卷 6399-6406页

作者： Yongqiang Zhang Kunxing Liu jingkun yu Haifeng Chen Rui Fu Siqi Zhu Zhenqiang Chen Shuangpeng Wang Siyu Lu Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China Department of Optoelectronic Engineering Jinan UniversityGuangzhou 510632China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacao 999078China School of electronic information and electrical engineering Chongqing University of Arts and SciencesChongqing 402160China

The most widely used method of identification of microbial morphology and structure is microscopy,but it can be difficult to distinguish between pathogens with a similar *** fluorescent staining methods require a combination of a variety of fluorescent materials to meet this *** this study,unique concentration-dependent fluorescent carbon dots(CDs)were synthesized for the identification and quantification of *** emission wavelength of the CDs could be tuned spanning the full visible region by virtue of aggregation-induced narrowing of *** tunable emission wavelength of the specific concentration response to diverse microbes can be used to distinguish microorganisms with a similar appearance,even in a same genus.A hyperspectral microscopy system was demonstrated to distinguish Aspergillus flavus and *** based on the results *** identification accuracy of the two similar-looking pathogens can be close to 100%,and the relative proportions and spatial distributions can also be profiled from the mixture of the *** technique can provide a solution to the fast detection of microorganisms and is potentially applicable to a wide range of problems in areas such as healthcare,food preparation,biotechnology,and health emergency.

关键词： carbon dots concentration-dependent wavelength-tunable hyperspectral imaging pathogens rapid detection machinelearning

Suppression of current-induced membrane discharge of bipolar membranes by regulating ion crossover transport

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Journal of Energy Chemistry 2024年第9期96卷 387-395页

作者： Tingting yu Haolan Tao jingkun Li Cheng Lian Honglai Liu State Key Laboratory of Chemical Engineering Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China School of Chemistry and Molecular Engineering East China University of Science and TechnologyShanghai 200237China

Bipolar membranes(BPMs)exhibit the unique capability to regulate the operating environment of electrochemical system through the water dissociation-combination ***,the industrial utilization of BPMs is limited by instability and serious energy *** current-induced membrane discharge(CIMD)at high-current conditions has a negative influence on the performance of anion-exchange membranes,but the underlying ion transport mechanisms in the BPMs remain ***,the CIMD-coupled Poisson-Nernst-Planck(PNP)equations are used to explore the ion transport mechanisms in the BPMs for both reverse bias and forward bias at neutral and acid-base *** is demonstrated that the CIMD effect in the reverse-bias mode can be suppressed by enhancing the diffusive transport of salt counter-ions(Na^(+)and Cl^(−))into the BPMs,and that in the forward-bias mode with acid-base electrolytes can be suppressed by matching the transport rate of water counter-ions(H_(3)O^(+)and OH^(−)).Suppressing the CIMD can promote the water dissociation in the reverse-bias mode,as well as overcome the plateau of limiting current density and reduce the interfacial blockage of salt co-ions(Cl^(−))in the anion-exchange layer in the forward-bias mode with acid-base *** work highlights the importance of regulating ion crossover transport on improving the performance of BPMs.

关键词： Bipolar membranes Current-induced membrane discharge Salt ion crossover Diffusion-migration-reaction process

Phase composition of SiC-ZrO2 composite materials synthesized from zircon doped La2O3

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Journal of Rare Earths 2009年第5期27卷 806-810页

作者： MA Beiyue yu jingkun School of Materials and Metallurgy Northeastern University Shenyang 110004 China School of Materials and Metallurgy Northeastern University Shenyang 110004 China

A study was carried out to determine the optimum parameters for synthesis of SiC-ZrO2 composite materials by carbothermal re-duction of zircon. Test samples were prepared by mixing average mesh size of less than 30 μm of carbon black and 40 μm of zircon with C/ZrSiO4 mass ratio of 0.2 and the extra addition amount of La2O3 was 0, 1 wt.% and 2 wt.%. Prepared samples were subjected to the car-bothermal reduction process at temperatures of 1723, 1753, 1773 and 1803 K for 4 h, respectively. The carbothermal reduction process was conducted in an atmosphere controlled tube furnace at an argon flow of 1.5 L/min. All products were examined by X-ray diffraction (XRD) to determine the transformation. The results showed that the best transformation of SiC-ZrO2 composite materials occurred at 1803 K for 4 h with the amount of 2 wt.%La2O3.

关键词： composite materials carbothermal reduction zircon lanthanum oxide rare earths

槐耳颗粒对索拉非尼耐药的肝细胞癌细胞凋亡的影响研究

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实用临床医药杂志 2024年第5期28卷 44-52页

作者：王利兵于敬坤曲凤智程大铭刘晓刚河北省唐山市工人医院肝胆外二科河北唐山063000

目的探讨槐耳颗粒对索拉非尼耐药的肝细胞癌(HCC)细胞生长的抑制作用及其分子机制。方法利用梯度浓度槐耳颗粒处理HCC细胞,分析槐耳颗粒对索拉非尼耐药的HCC细胞增殖、迁移和侵袭的效果。采用生物信息学手段分析微小RNA-31-5p(miR-31-5p... 详细信息

目的探讨槐耳颗粒对索拉非尼耐药的肝细胞癌(HCC)细胞生长的抑制作用及其分子机制。方法利用梯度浓度槐耳颗粒处理HCC细胞,分析槐耳颗粒对索拉非尼耐药的HCC细胞增殖、迁移和侵袭的效果。采用生物信息学手段分析微小RNA-31-5p(miR-31-5p)与sprouty相关EVH1域蛋白1(SPRED1)的可能互作关系。采用实时荧光定量聚合酶链反应(qRT-PCR)检测HCC细胞中miR-31-5p、SPRED1的表达;采用CCK-8、克隆形成、划痕愈合、Transwell以及流式细胞术实验分别检测细胞活力、增殖、迁移、侵袭和凋亡;采用RNA免疫沉淀(RIP)实验和双荧光素酶实验验证miR-31-5p与SPRED1的结合关系。结果槐耳颗粒可以显著抑制索拉非尼耐药的HCC细胞增殖、迁移和侵袭,并诱导细胞凋亡。生物信息学分析发现miR-31-5p在HCC中高表达,而槐耳颗粒可以下调miR-31-5p的表达,抑制索拉非尼耐药的HCC细胞的增殖和转移,并诱导细胞凋亡;miR-31-5p可靶向抑制SPRED1的表达。SPRED1在HCC中表达下调,过表达SPRED1可以逆转miR-31-5p过表达对索拉非尼耐药的HCC增殖和转移的促进作用。结论槐耳颗粒通过miR-31-5p/SPRED1轴抑制索拉非尼耐药的HCC转移,表明槐耳颗粒有潜力作为治疗HCC的新型药物。

关键词：槐耳颗粒微小RNA-31-5p sprouty相关EVH1域蛋白1 索拉非尼耐药性肝细胞癌凋亡

Influence of processing parameters on the phase composition of ZrN-Si_3N_4 synthesized from zircon

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Rare Metals 2009年第4期28卷 367-371页

作者： MA Beiyue yu jingkun School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The optimum parameters were determined for synthesizing ZrN-Si3N4 composite powder from zircon by carbothermal reduction-nitridation （CTRN） process. The samples were prepared by mixing the carbon black of an average particle size less than 30 μm and the zircon of 40 μm with C/ZrSiO4 mass ratios of 0.2, 0.3, 0.4, and 0.5. The prepared samples were subjected to the CTRN process at temperatures of 1673, 1723, 1753, and 1773 K for 6, 9, and 12 h. The CTRN process was conducted in an atmosphere-controlled tubular furnace in a nitrogen gas flow of 1.0 L/rain. All the products were examined by X-ray powder diffraction to determine the transformation. The results showed that the proper transformation of ZrN-Si3N4 occurred at 1773 K for 12 h with a C/ZrSiO4 mass ratio of 0.4.

关键词： inorganic non-metal materials nitrides carbothermal reduction-nitridation zircon processing parameters phase composition

Electron-phonon coupling-assisted universal red luminescence of o-phenylenediamine-based carbon dots

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Light(Science & Applications) 2022年第7期11卷 1501-1514页

作者： Boyang Wang Zhihong Wei Laizhi Sui jingkun yu Baowei Zhang Xiaoyong Wang Shengnan Feng Haoqiang Song Xue Yong yuxi Tian Bai Yang Siyu Lu Green Catalysis Center and College of ChemistryZhengzhou University450000 ZhengzhouChina Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringJiangsu Key Laboratory of Vehicle Emissions ControlNanjing University210023 NanjingChina State Key Lab of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences116023 DalianChina Nanochemistry Department Istituto Italiano di Tecnologia(IIT)via Morego 3016163 GenovaItaly School of Physics National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresNanjing University210093 NanjingChina Department of Chemistry University of SheffieldSheffield S37HFUK State Key Lab of Supramolecular Structure and Materials College of ChemistryJilin University130012 ChangchunChina

Due to the complex core-shell structure and variety of surface functional groups,the photoluminescence(PL)mechanism of carbon dots(CDs)remain unclear.o-Phenylenediamine(oPD),as one of the most common precursors for preparing red emissive CDs,has been extensively ***,most of the red emission CDs based on oPD have similar PL emission ***,we prepared six different oPD-based CDs and found that they had almost the same PL emission and absorption spectra after *** and spectral characterization indicated that they had similar carbon core structures but diffferent surface polymer ***,single-molecule PL spectroscopy confirmed that the multi-modal emission of those CDs originated from the transitions of different vibrational energy levels of the same PL center in the carbon *** addition,the phenomenon of"spectral splitting"of single-particle CDs was observed at low temperature,which confirmed these oPD-based CDs were unique materials with properties of both organic molecules and quantum ***,theoretical calculations revealed their potential polymerization mode and carbon core ***,we proposed the PL mechanism of red-emitting CDs based on oPD precursors;that is,the carbon core regulates the PL emission,and the polymer shell regulates the PL *** work resolves the controversy on the PL mechanism of oPD-based red *** findings provide a general guide for the mechanism exploration and structural analysis of other types of CDs.

关键词： structure. carbon luminescence