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Improving dispersion and delamination of graphite in biodegradable starch materials via constructing cation-π interaction: Towards microwave shielding enhancement

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Journal of Materials Science & Technology 2022年第34期129卷 196-205页

作者： Yi Yang Jun-Ru Tao Dian Yang Qian-Ming He xu-dong chen Ming Wang Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China Key Laboratory of Polymer Composite and Function Materials of Ministry of Education Key Laboratory for Designed Synthesis and Applied Polymer MaterialsSchool of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhou 510275China

Herein, a low-cost, biodegradable, and high-performance microwave shielding graphite/starch material was fabricated via constructing a cation-π interaction between ammonium ions and graphite. The graphite flakes and starch were firstly mixed with distilled water containing ammonium hydroxide to form graphite/starch slurry under an ultrasonic assistant. The cation-π interaction could improve delamination degree and dispersion of graphite in starch matrix. The slurry was first used as a coating material on the surface of wood and paper to develop shielding packages. The effect of coating thickness and coating layers on EM shielding property of the materials was investigated. Second, the composites with a high orientation of graphite were fabricated by compression at high pressures. The electrical conductivity and EM shielding effectiveness(SET) of the materials were greatly enhanced by construction of cation-πinteraction and orientation of graphite. Specifically, the EM SETvalues increased from 56.9 to 66.8 d B for the composites with 50 wt.% graphite and 2.0 mm in thickness by constructing cation-π interaction. The EM SETvalues raised from 17.4 to 66.8 d B via the graphite orientation in the materials with the same components and thickness. The shielding mechanism of the compressed composites with orientation dispersion of graphite was also discussed in comparison to the coating layer with random dispersion of graphite.

关键词： Electromagnetic shielding Graphite Starch Bio-degradable Cation-πinteraction

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Palladium-assisted Metal Patterning on Polyimide Surfaces

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Chinese Journal of Polymer Science 2022年第10期40卷 1287-1296,I0011页

作者： Shi-Long Zhong Bai-Yang Zhou Xi-Rui Gu Ding-Shan Yu xu-dong chen Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Key Laboratory of High Performance Polymer-based Composites of Guangdong Province School of Chemistry Sun Yat-sen UniversityGuangzhou 510275China

A novel method of patterning high precision copper conductive micropatterns on flexible polymer substrate(polyimide)is *** utilized the coordination effect between palladium salts and pyridine structures to fix the palladium chloride(PdCl_(2))on the surface of polymer film while the 2,6-dimethylpyridine structures formed in the specific areas under ultraviolet light guaranteed the resolution of final *** thermal reduction of PdCl_(2) on the surface can be achieved in the process of thermal cyclization of the polymer *** a consequence,the obtained polyimide(PI)film can be patterned with conductive copper micropatterns directly by electroless *** particular,we accomplished the deposition of high precision copper pattern with a minimum line width of 50μm and minimum line spacing of 20μm on PI thin films(thickness~10μm)by electroless *** prepared conductive copper micropatterns exhibit a low resistivity of 1.78μΩ·cm the same as the pure block *** the relationship between the structures of the polymer chains and the physical properties of polymer substrates,such as the dimensional stability,mechanical and dielectric properties were also discussed in *** simple and novel method of patterning metal on the polymer surface does not need to achieve the catalytic metal adhesion required for electroless plating at the cost of destroying the substrate surface and avoiding the introduction of unstable *** patterning method is compatible with the current roll-to-roll production process and can be used to develop high-performance micro-integrated circuits.

关键词： Polyimide Metal patterning Electroless plating Palladium chloride Coordination effect

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Divalent nitrogen-rich cationic salts with great gas production capacities

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Defence Technology（防务技术） 2023年第4期22卷 54-68页

作者： Hao Gu cheng-chuang Li Chang-hao Dai dong-xu chen Hong-wei Yang Guang-bin cheng School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyXiaolingwei 200Nanjing210094PR China

Monocyclic nitrogen-rich 3-(aminomethyl)-4,5-diamine-1,2,4-triazole(1)and fused cyclic 3,7-diamine-6-(aminomethyl)-[1,2,4]triazolo[4,3-b][1,2,4]triazole(9)were synthesized through the convenient cyclization reaction from the readily available *** energetic salts with high nitrogen content were proved to be rare examples of divalent monocyclic/fused cyclic cationic salts according to the single crystal *** structure of intermediate B was also identified and verified by its trivalent cation crystal 17.5H_2O *** compounds 2-8 and 10-17 were fully characterized by NMR spectroscopy,infrared spectroscopy,differential scanning calorimetry,elemental *** energetic salts exhibit good thermal stability with decomposition temperatures ranged from 182℃to 245℃.The sensitivity of compounds 2,6,10 and 14 is similar or superior to that of RDX while the others were much more insensitive to mechanical ***,detonation velocity of 10(8843 m/s)surpass that of RDX(D=8795 m/s).Considering the high gas production volume(≥808 L/kg)of 2,4,10and 12,constant-volume combustion experiments were conduct to evaluate their gas production capacities *** compounds possess much higher maximum gas-production pressures(P_(max):7.88-10.08 MPa)than the commonly used reagent guanidine nitrate(GN:P_(max)=4.20 MPa),which indicate their strong gas production capacity.

关键词： Fused cyclic compound Triazole Divalent cation Gas production Energetic materials

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Budd-Chiari syndrome in China: A 30-year retrospective study on survival from a single center

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World Journal of Gastroenterology 2018年第10期24卷 1134-1143页

作者： Wei Zhang Qiao-Zheng Wang Xiao-Wei chen Hong-Shan Zhong Xi-Tong Zhang xu-dong chen Ke xu Department of Interventional Radiology Shenzhen People’s Hospital the Second Affiliated Hospital of Jinan University Department of Radiology The First Affiliated Hospital of China Medical University Key Laboratory of Diagnostic Imaging and Interventional Radiology of Liaoning Province The First Affiliated Hospital of China Medical University

AIM To investigate 30-year treatment outcomes associated with Budd-Chiari syndrome(BCS) at a tertiary hospital in *** A total of 256 patients diagnosed with primary BCS at our tertiary hospital between November 1983 and September 2013 were followed and retrospectively studied. Cumulative survival rates and cumulative mortality rates of major causes were calculated by Kaplan-Meier analysis, and the independent predictors of survival were identified using a Cox regression model. RESULTS Thirty-four patients were untreated; however, 222 patients were treated by medicine, surgery, or interventional radiology. Forty-four patients were lost to follow-up; however, 212 patients were followed, 67 of whom died. The symptom remission rates of treated and untreated patients were 81.1%(107/132) and 46.2%(6/13), respectively(P = 0.009). The cumulative 1-, 5-, 10-, 20-, and 30-year survival rates of the treated patients were 93.5%, 81.6%, 75.2%, 64.7%, and 58.2%, respectively; however, the 1-, 5-, 10-, 20-, and 30-year survival rates of the untreated patients were 70.8%, 70.8%, 53.1%, 0%, and unavailable, respectively(P = 0.007). Independent predictors of survival for treated patients were gastroesophageal variceal bleeding(HR = 3.043, 95%CI: 1.363-6.791, P = 0.007) and restenosis(HR = 4.610, 95%CI: 1.916-11.091, P = 0.001). The cumulative 1-, 5-, 10-, 20-, and 30-year mortality rates for hepatocellular carcinoma were 0%, 2.6%, 3.5%, 8%, and 17.4%, *** Long-term survival is satisfactory for treated Chinese patients with BCS. Hepatocellular carcinoma is a chronic complication and should be monitored with long-term follow-up.

关键词： Budd-Chiari syndrome Chinese Survival Interventional radiology

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Effects of cooling rates on microporosity in DC casting Al-Li alloy

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China Foundry 2022年第2期19卷 177-190页

作者： Yu-xuan Zhang Jun-sheng Wang dong-xu chen Bing Wang Chi Zhang Zheng-an Wang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Chinalco Southwest Aluminium(Group)Co. Ltd.Chongqing 401326China

During the direct chill(DC)casting process,primary cooling from the mold and bottom block,and secondary cooling from the waterjets produce a concave solid *** depth of this liquid pocket and mushy zone not only depends on the solidification range of the alloy but also the boundary conditions such as cooling ***-Li alloys solidify in a long solidification range increasing the susceptibility of porosity nucleation in the semi-solid *** this study,the effects of cooling rate on the porosity formation were quantified for the large ingot casting using X-ray computed tomography(XCT).By characterizing pore size distributions at four different cooling conditions,the correlation between the mechanical properties at both room and high temperatures and the microstructure features was *** constitutive equations were *** is found that increasing the cooling rate reduces the grain size,increases the number density of micropores,and minimizes the number of large pores,thereby improving the mechanical ***,long mushy zones and deep liquid pockets in Al-Li alloys can be effectively controlled by controlling the boundary conditions of the DC casting solidification process,thereby obtaining castings with excellent mechanical properties.

关键词： Al-Li alloys microporosity cooling rate XCT constitutive equation

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A V-Folded Digital Laser for On-Demand Vortex Beams by Astigmatic Transformation of Hermite–Gaussian Modes

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Chinese Physics Letters 2019年第12期36卷 32-35页

作者： Sen-Sen Liu xu-dong chen Ji-Xiong Pu Zhi-Li Lin Zi-Yang chen Fujian Key Laboratory of Light Propagation and Transformation College of Information Science and EngineeringHuaqiao UniversityXiamen 361021

A V-folded digital laser using a spatial light modulator(SLM)for intra-cavity loss shaping is exploited to generate Hermite-Gaussian modes with on-demand mode *** aπ/2 astigmatic mode converter,vortex beams carrying on-demand orbital angular momentum(OAM)with a tunable range from-11h to 12 h are *** mode order of the HG mode,hence the OAM of the vortex beam,is digitally switched by changing the phase pattern imposed on the SLM without requiring any mechanic alignment of the *** work has great potential applications in various OAM-tunable vortex beams.

关键词： tunable modulator switched

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Restenosis after recanalization for Budd-Chiari syndrome: Management and long-term results of 60 patients

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World Journal of Clinical Cases 2020年第14期8卷 2930-2941页

作者： Wei Zhang Yu-Long Tian Qiao-Zheng Wang Xiao-Wei chen Qi-Yang Li Jin-Hang Han xu-dong chen Ke xu Department of Interventional Radiology Shenzhen People’s Hospitalthe Second Affiliated Hospital of Jinan UniversityShenzhen 518020Guangdong ProvinceChina Department of Interventional Radiology The First Affiliated Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina

BACKGROUND Budd-Chiari syndrome is defined as hepatic venous outflow tract *** Asian Budd-Chiari syndrome patients,the major treatment modality is recanalization(percutaneous transluminal angioplasty with or without stent implantation).The cumulative 1-,5-,and 10-year primary patency rates and survival rates are reported to be excellent or satisfactory,but the long-term outcome of patients with restenosis(the most common complication after recanalization)is *** To explore the treatment strategy for restenosis in patients with Budd-Chiari syndrome after interventional therapy and to evaluate the long-term follow-up *** The clinical data and follow-up results of 60 patients with restenosis after interventional therapy from November 1983 to December 2013 were retrospectively *** Sixty patients with restenosis were retrospectively divided into a percutaneous transluminal angioplasty(PTA)group(40 patients)and a PTA+stent group(20 patients)according to the primary recanalization *** the patients with restenosis in the PTA group,13 refused treatment,and 27 received further treatment;among these patients,five had a second restenosis,two had a third restenosis,and one had a fourth *** the patients with restenosis in the PTA+stent group,nine refused treatment,ten received PTA alone,and the other received PTA+stent *** the patients who received further treatment,five had a second restenosis,three had a third restenosis,and one had a fourth *** 1-,5-,10-,20-,and 25-year cumulative survival rates of the 38 patients who received further treatment after restenosis were 100%,78.3%,78.3%,70.5%,and 70.5%,respectively;however,for the 22 patients who refused treatment,the survival rates were 72.7%,45.9%,30.6%,10.2%,and unavailable,respectively(P<0.001).CONCLUSION Long-term follow-up after interventional therapy is very *** treatment for patients with restenosis can improve prognosis,an

关键词： Budd-Chiari syndrome Restenosis Long-term follow-up Treatment strategy

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Efficient removal of natural organo-chromium(Ⅲ)through selfcirculating decomplex and immobilization with nanoscale zerovalent iron

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Nano Research 2024年第1期17卷 364-371页

作者： Zhicheng dong Yunyun xu Can Wu Jin Chao chen Tian Zhang Lin School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China College of Ecology and Environment Chengdu University of TechnologyChengdu 610059China School of Environment and Energy The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education)South China University of TechnologyGuangzhou 510006China

Organo-chromium(III)complex is one of the chromium contaminant species,which would transform to high-toxic Cr(VI)during migrating in the *** natural organo-chromium(III)(NOCr)is difficult to remove by traditional degradation or precipitation methods,due to its high stability and ***,we demonstrated a novel NOCr removing method by transforming it to certain structures similar to Cr-Fe minerals in nature,through a self-circulating decomplex and immobilization mechanism with nano zero-valent iron(nZVI).Taking chromium glycinate(Cr-Gly)as a probe,nZVI showed a high Cr removal efficiency of 99.4%under ambient *** removal process included three stages of adsorption,decomplexation,and ***-Gly was first adsorbed on the surface of nZVI by chemisorption of the oxide ***,the adsorbed Cr-Gly was decomplexed and oxidized to Cr(VI)by·OH and 1O_(2),which were generated from molecular oxygen activated by ***,the released Cr(VI)could be in-situ adsorbed and re-reduced to Cr(III),which was further immobilized in form of Cr-O-Fe *** the Cr-O-Fe complexing structure was similar to that of Cr-Fe minerals(such as chromohercynite)in nature,this work explored a novel and efficient NOCr removing method that was potential to weaken chromium pollution in the environment.

关键词： organo-chromium(III) zero-valent iron adsorption decomplexation Cr immobilization

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Growth of 12-inch uniform monolayer graphene film on molten glass and its application in PbI2-based photodetector

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Nano Research 2019年第8期12卷 1888-1893页

作者： Zhaolong chen Haina Ci Zhenjun Tan Zhipeng Dou xu-dong chen Bingzhi Liu Ruojuan Liu Li Lin Lingzhi Cui Peng Gao Hailin Peng Yanfeng Zhang Zhongfan Liu Center for Nanochemistry (CNC) Beijing Science and Engineering Center for NanocarbonsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for Molecular Sciences Beijing 100871China Electron Microscopy Laboratory School of PhysicsPeking UniversityBeijing 100871China Beijing Graphene Insititue (BGI) Beijing 100095China Department of Materials Science and Engineering College of Engineering Peking UniversityBeijing 100871China

Direct growth of large area uniform graphene on functional insulating materials is essential for engineering versatile applications of graphene. However, the existing synthesis approaches can hardly avoid the generation of non-uniform multilayer graphene along the gas flow direction, affording huge challenges for further scaling up. Herein, by exploiting the molten state of soda-lime glass, we have accomplished the direct growth of large area uniform (up to 30 cm × 6 cm) graphene via a facile chemical vapor deposition route on low cost soda-lime glass. The use of molten glass eliminates the chemically active sites (surface corrugations, scratches, defects), and improves the mobility of carbon precursors, affording uniform nucleation and growth of monolayer graphene. Intriguingly, thus-obtained graphene acts as an ideal coating layer for the surface crystallographic modification of soda-lime glass, making it epitaxy substrates for synthesizing high-quality PbI2 nanoplates and continues films. Accordingly, a prototype photodetector was fabricated to present excellent photoelectrical properties of high responsivity (~ 600 on/off current ratio) and fast response speed (18 μs). This work hereby paves ways for the batch production and the direct applications of graphene glass as platforms for constructing high performance electronic and optoelectronic devices.

关键词： graphene chemical vapor deposition dielectric substrate lead iodide photodetector

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Synthesis of wafer-scale graphdiyne/graphene heterostructure for scalable neuromorphic computing and artificial visual systems

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Nano Research 2021年第12期14卷 4591-4600页

作者： Zhi-cheng Zhang Yi Li Jing-Jing Wang De-Han Qi Bin-Wei Yao Mei-Xi Yu xu-dong chen Tong-Bu Lu Ministry of Education International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Material Science and EngineeringTianjin University of TechnologyTianjin300384China Key Laboratory of Computer Vision and Systems(Ministry of Education) School of Computer Science and EngineeringTianjin University of TechnologyTianjin300384China

Graphdiyne(GDY)is emerging as a promising material for various applications owing to its unique structure and fascinating ***,the application of GDY in electronics and optoelectronics are still in its infancy,primarily owing to the huge challenge in the synthesis of large-area and uniform GDY film for scalable *** a modified van der Waals epitaxy strategy is proposed to synthesize wafer-scale GDY film with high uniformity and controllable thickness directly on graphene(Gr)surface,providing an ideal platform to construct large-scale GDY/Gr-based optoelectronic synapse *** synaptic behaviors have been realized,and the linear and symmetric conductance-update characteristics facilitate the implementation of neuromorphic computing for image recognition with high accuracy and strong fault *** functions including“NAND”and“NOR”are integrated into the synapse which can be executed in an optical ***,a visible information sensing-memory-processing system is constructed to execute real-time image acquisition,in situ image memorization and distinction tasks,avoiding the time latency and energy consumption caused by data conversion and transmission in conventional visual *** results highlight the potential of GDY in applications of neuromorphic computing and artificial visual systems.

关键词： graphdiyne optoelectronic synapses neuromorphic computing sensing-memory-processing optical logic functions

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