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Influence of substrate metals on the crystal growth of AlN films

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International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 98-103页

作者： juan xiong Hao-shuang Gu Kuan Hu Ming-zhe Hu School of Physics and Electronic Technology Hubei University Wuhan 430062 China

AlN films were deposited by reactive radio frequency （RF） sputtering on various bottom electrodes, such as Al, Ti, Mo, Au/Ti, and Pt/Ti. The effects of substrate metals on the orientation of AlN thin films were investigated. The results of X-ray diffraction, atomic force microscopy, and field emission scanning electron microscopy show that the orientation of AlN films depends on the kinds of substrate metals evidently. The differences of AlN films deposited on various metal electrodes are attributed to the differences in lattice mismatch and thermal expansion coefficient between the AlN material and substrate metals. The AlN film deposited on the Pt/Ti electrode reveals highly the c-axis orientation with well-textured columnar structure. The positive role of the Pt/Ti electrode in achieving the high-quality AlN films and high-performance film bulk acoustic resonator （FBAR） may be attributed to the smaller lattice mismatch as well as the similarity of thermal expansion coefficient between the deposited AlN material and the Pt/Ti electrode substrate.

关键词： AlN films substrate orientation crystallinity

Microstructure and antibacterial property of stainless steel implanted by Cu ions

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中国有色金属学会会刊：英文版 2004年第z1期14卷 328-331页

作者： XU Bo-fan NI Hong-wei xiong Ping-yuan xiong juan DAN Zhi-gang School of Material and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China School of Material and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China School of Medicine Science Wuhan 430081 China School of Material and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China School of Material and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China

Copper ions were implanted into AISI 304 austenitic stainless steel by metal vapor vacuum are (MEVVA) with 60 - 100 keV energy and a dose range (0.2 - 5.0) × 1017 cm-2. Then Cu-implanted stainless steel was treated by a special antibacterial treatment. Antibacterial rates of Cu-implanted stainless steel, Cu-implanted stainless steel with special antibacterial treatment and un-implanted stainless steel were obtained by agar plate method. Phase composition in the implanted layer was analyzed by glancing X-ray diffraction (GXRD). Microstructure of antibacterial stainless steel was observed with transmission electron microscopy (TEM), and changes of the bacterium appearance after 24 h antibacterial action on the surface of un-implanted and Cu-implanted stainless steel with antibacterial treatment were observed with bio-TEM respectively. The results show that stainless steel obtains antibacterial property against E. coli when the Cu ions dose approaches to the saturated one. A suitable amount of Cu-rich phase uniformly disperses on the surface of Cu-implanted stainless steel that is treated by the special antibacterial treatment. The Cu-rich phase naked on the surface has a function of damage to pericellular membrane and cell wall,the pericellular membrane is thickened and the karyon degraded, and finally, bacteria die. Cu-rich phase naked on the surface endows stainless steel with best antibacterial property.

关键词： stainless steel copper ion implantation antibacterial property

Formation of granulation tissue on bilateral vocal cords after doublelumen endotracheal intubation:A case report

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World Journal of Clinical Cases 2022年第34期10卷 12690-12695页

作者： Xiao-juan xiong Li Wang Ting Li Department of Anesthesiology Army Medical Center of PLADaping HospitalArmy Medical UniversityChongqing 400042China

BACKGROUND Most case reports on laryngeal granuloma formation have described patients after tracheotomy and single-lumen endotracheal *** studies have investigated vocal cord granuloma formation after double-lumen endotracheal(DLT)*** SUMMARY We report granulation tissue formation on the bilateral vocal cords after DLT intubation in a 45-year-old,153-cm-tall female *** imaging reports showed no formation of vocal cord granuloma before DLT ***,we inferred that DLT intubation may have been the main reason for the postoperative granulation tissue formation on her bilateral vocal cords,based on the patient’s history of DLT intubation,persistent hoarseness after thoracic surgery,and fibrolaryngoscopic and pathological reports during 12 mo *** Thirty-two Fr DLT tubes should be utilized for thoracic surgery on female patients who are shorter than 153 cm in height.

关键词： DLT Double-lumen endotracheal Granulation Vocal cords Case report

Sandwich-Like Fe&TiO2@C Nanocomposites Derived from MXene/Fe-MOFs Hybrids for Electromagnetic Absorption

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Nano-Micro Letters 2020年第4期12卷 121-136页

作者： Baiwen Deng Zhen Xiang juan xiong Zhicheng Liu Lunzhou Yu Wei Lu Shanghai Key Lab.of D&A for Metal‑Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804People’s Republic of China School of Materials Science&Engineering University of Shanghai for Science and TechnologyShanghai 200092People’s Republic of China

Electromagnetic pollution has been causing a series of problems in people’s life,and electromagnetic absorbers with lightweight and broad absorbing bandwidth properties are widely *** this work,novel sandwich-like 2D laminated Fe&TiO2 nanoparticles@C nanocomposites were rationally designed and successfully developed from the MXene–MOFs *** formation of Fe and rutile-TiO2 nanoparticles sandwiched by the two-dimensional carbon nanosheets provided strong electromagnetic energy attenuation and good impedance matching for electromagnetic wave(EMW)*** expected,the nanocomposites achieved a broad effective absorption bandwidth of 6.5 GHz at a thickness of only 1.6 mm and the minimum reflection loss(RL)value of−51.8 dB at 6.6 GHz with a thickness of 3 *** work not only provides a good design and fabricating concept for the laminated metal and functional nanoparticles@C nanocomposites with good EMW absorption,but also offers an important guideline to fabricate various two-dimensional nanocomposites derived from the MXene precursors.

关键词： MXene Metal–organic frameworks Nanocomposites Electromagnetic wave absorption

Modelling of the electronic and ferroelectric properties of trichloroacetamide using Monte Carlo and first-principles calculations

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Journal of Materiomics 2017年第2期3卷 130-134页

作者： Yaxuan Cai Shijun Luo Zhao Wang juan xiong Haoshuang Gu Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei Key Laboratory of Ferro&Piezoelectric Materials and DevicesFaculty of Physics&Electronic SciencesHubei UniversityWuhan 430062PR China School of Sciences Hubei Automotive Industries InstituteShiyan 442002PR China

The electronic structure and ferroelectric mechanism of trichloroacetamide were studied using first principles calculations and density functional theory within the generalized gradient *** both Bader charge and electron deformation density,large molecular spontaneous polarization is found to originate from the charge transfer cause by the strong“push-pull”effect of electron-releasing interacting with electron-withdrawing *** intermolecular hydrogen bonds,Ne-H…O,produce dipole moments in adjacent molecules to be aligned with each *** also reduce the potential energy of the molecular chain threaded by hydrogen *** to the symmetric crystalline properties,however,the polarization of trichloroacetamide is mostly compensated and therefore *** the Berry Phase method,the spontaneous polarization of trichloroacetamide was simulated,and good agreement with the experimental values was *** the polarization characteristics of trichloroacetamide,we constructed a one-dimensional ferroelectric Hamiltonian model to calculate the ferroelectric properties of *** the Hamiltonian model,the thermal properties and ferroelectricity of trichloroacetamide were studied using the Monte Carlo method,and the Tc value was calculated.

关键词： First-principles study Monte Carlo Trichloroacetamide TCAA Organic ferroelectrics

Coordination engineering of cobalt phthalocyanine by functionalized carbon nanotube for efficient and highly stable carbon dioxide reduction at high current density

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Nano Research 2022年第4期15卷 3056-3064页

作者： Hongdong Li Yue Pan Zuochao Wang Yaodong Yu juan xiong Haoyang Du Jianping Lai Lei Wang Shouhua Feng Key Laboratory of Eco-chemical Engineering Taishan scholar advantage and characteristic discipline team of Eco-chemical process and technologyCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

Coordination engineering can enhance the activity and stability of the catalyst in heterogeneous ***,the axial coordination engineering between different groups on the carbon carrier and molecular catalysts in the electrocatalytic carbon dioxide reduction reaction(CO_(2)RR)has been studied *** coordination engineering strategy,a series of amino(NH_(2)),hydroxyl(OH),and carboxyl(COOH)groups functionalized carbon nanotubes(CNT)immobilized cobalt phthalocyanine(CoPc)catalysts are *** with no groups,OH groups and COOH groups,NH_(2)groups can effectively change the coordination environment of the central metal Co,thereby significantly increasing the turnover frequency(TOF)(31.4 s^(-1)at-0.6 V ***,CoPc/NH_(2)-CNT>CoPc/OH-CNT>CoPc/COOH-CN>CoPc/CNT).In the flow cell,the CoPc/NH_(2)-CNT catalyst has high carbon monoxide(CO)selectivity at high current density(~100%at-225 mA·cm^(-2),~96%at-351 mA·cm^(-2)).Importantly,the CoPc/NH_(2)-CNT catalyst can operate stably for 100 h at 225 mA·cm^(-2).Theoretical calculations reveal that CoPc/NH_(2)-CNT catalyst is beneficial to the formation of^(*)COOH and desorption of^(*)CO,thus promoting CO_(2)*** work provides an excellent platform for understanding the effect of coordination engineering on electrocatalytic performance and promotes a way to explore efficient and stable catalysts in other applications.

关键词： cobalt phthalocyanine(CoPc) functionalized carbon nanotubes(CNT) coordination engineering highly stable carbon dioxide electroreduction

Advanced natural products chemistry research in China between 2015 and 2017

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Chinese Journal of Natural Medicines 2018年第12期16卷 881-906页

作者： YANG Guo-Xun MA Guang-Lei LI Hao HUANG Ting xiong juan HU Jin-Feng Department of Natural Products Chemistry School of Pharmacy Fudan University

In this review, we intensively focus on the advances in research of natural products(NPs) discovery carried out by domestic scholars in China from 2015 through 2017. In general, a total of 1811 publications(1479 in English and 332 in Chinese) were accumulated regarding newly isolated NPs from plants, microorganisms, and marine sources. As a result, 277 selected papers concerning naturally occurring compounds with extraordinary frameworks, origins, and promising activities were discussed in this review article, mainly organized according to their structural classes and novelties.

关键词： Natural Products Chemistry Novel Structures Research Progress Review

Palcernuine, the first [5/6/6/6]-cernuane-type alkaloid from Palhinhaea cernua ***

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Chinese Chemical Letters 2016年第6期27卷 969-973页

作者： Yu Tang juan xiong Yike Zou Bastien Nay Li-Jun Wang Jin-Feng Hu Department of Natural Products Chemistry School of PharmacyFudan UniversityShanghai 201203China Department of Chemistry University of PennsylvaniaPhiladelphia 19104-6323USA Unite Molecules de Communication et Adaptation des Micro-organismes Sorbonne UniversitesMuseum National d'Histoire NaturelleCentre National de la Recherche Scientifique(CNRS UMR 7245)Paris 75005France

One novel（named palcernuine, 1） and five known cernuane-type（2–6） alkaloids were isolated from the whole plant of Palhinhaea cernua f. sikkimensis. The structure of 1, possessing an unprecedented [5/6/6/6]-tetracyclic ring system containing two nitrogen atoms, was established on the basis of spectroscopic methods, and its absolute configuration was determined by comparison of the experimental and calculated electronic circular dichroism（ECD） spectra. A plausible biosynthetic pathway to 1 is proposed.

关键词： Palhinhaea cernua f.sikkimensis Lycopodiaceae Palcernuine Cernuane-type alkaloids Biosynthetic pathway

Quantitative analysis of Pb adsorption on sulfhydryl-modified biochar

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Biochar 2021年第1期3卷 37-49页

作者： juan xiong Mengge Zhou Chenchen Qu Daohai Yu Chang Chen Mingxia Wang Wenfeng Tan Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River) Ministry of AgricultureCollege of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070People’s Republic of China

Biochar is an effective absorbent for remediating heavy metal contaminated soil,but functional optimization is still needed to improve its performance in field ***,we characterized the physical structures and surface chemical properties of raw wood biochar and palm biochar(WB and PB)and the corresponding sulfhydryl-modified biochar(SWB and SPB).Their adsorption capacity for Pb was evaluated by combining thermodynamic and kinetic adsorption at 0.01 mol/L KCl and corresponding model *** results demonstrated successful grafting of sulfhydryl groups onto the biochar,which dramatically reduced the specific surface area(SSA)and pore volume of *** pKa in the surface complexation model(SCM)indicated similar proton affinity between sulfhydryl groups and original functional groups on the *** could satisfactorily fit the Pb adsorption behaviors,and model analysis revealed that Pb tended to be adsorbed on low-proton affin-ity sites at low pH,but high-proton affinity sites became dominant in Pb adsorption with increasing pH and adsorbed almost all Pb ions at pH>***,the Pb adsorption density of SWB and SPB was improved by 8.86 and 3.64 folds relative to that of WB and PB,*** 90% of initially added Pb ions were removed in 1440 and 720 min by raw and sulfhydryl-modified biochar,respectively,indicating that sulfhydryl modification accelerated the Pb adsorption of *** results suggest that site density,SSA and pore structure of biochar play crucial roles in heavy metal adsorption,and sulfhydryl modification may improve the performance of biochar in remediating heavy metal contaminated soil.

关键词： Biochar Pb adsorption Sulfhydryl modification Modeling