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Purification of copper foils driven by single crystallization

Chinese Physics B 2024年第2期33卷 506-511页

作者：寇金宗赵孟泽李兴光何梦林杨方友刘科海成庆秋任云龙刘灿付莹吴慕鸿刘开辉王恩哥 Songshan Lake Materials Laboratory Dongguan 523808China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of PhysicsSouth China Normal UniversityGuangzhou 510006China Guangdong–Hong Kong Joint Laboratory of Quantum Matter Frontier Research Institute for PhysicsSouth China Normal UniversityGuangzhou 510006China State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Department of PhysicsRenmin University of ChinaBeijing 100872China International Center for Quantum Materials Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing 100871China School of Physics Liaoning UniversityShenyang 110036China

High-purity copper(Cu) with excellent thermal and electrical conductivity, is crucial in modern technological applications, including heat exchangers, integrated circuits, and superconducting magnets. The current purification process is mainly based on the zone/electrolytic refining or anion exchange, however, which excessively relies on specific integrated equipment with ultra-high vacuum or chemical solution environment, and is also bothered by external contaminants and energy consumption. Here we report a simple approach to purify the Cu foils from 99.9%(3N) to 99.99%(4N) by a temperature-gradient thermal annealing technique, accompanied by the kinetic evolution of single crystallization of *** success of purification mainly relies on(i) the segregation of elements with low effective distribution coefficient driven by grain-boundary movements and(ii) the high-temperature evaporation of elements with high saturated vapor *** purified Cu foils display higher flexibility(elongation of 70%) and electrical conductivity(104% IACS) than that of the original commercial rolled Cu foils(elongation of 10%, electrical conductivity of ~ 100% IACS). Our results provide an effective strategy to optimize the as-produced metal medium, and therefore will facilitate the potential applications of Cu foils in precision electronic products and high-frequency printed circuit boards.

关键词： purification copper foil thermal annealing technique single crystallization

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Numerical simulations of the wavefront distortion of inter-spacecraft laser beams caused by solar wind and magnetospheric plasmas

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Plasma Science and Technology 2020年第11期22卷 23-35页

作者： Lingfeng LU Ying LIU Huizong DUAN Yuanze JIANG Hsien-Chi YEH TianQin Research Center for Gravitational Physics and School of Physics and Astronomy Sun Yat-sen University(Zhuhai Campus)Zhuhai 519082People's Republic of China MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

Plasma turbulence may lead to additional wavefront distortion of inter-spacecraft laser beams during the operation of spaceborne gravitational wave(GW)observatories,*** *** making use of the Space Weather Modelling Framework(SWMF)model and realistic orbit data for the Tian Qin constellation,the characteristic parameters of the plasma turbulence present at the Tian Qin orbit are *** a first step,this work is based on the assumptions that the cold plasma approximation is valid and that the effects of the electromagnetic field induced by charge separation within the Debye length on the laser's wavefront can be *** atmospheric turbulence-laser interaction model is then applied to analyze the effects of the plasma turbulence on the inter-spacecraft laser's *** preliminary results show that the wavefront distortion caused by the plasma turbulence is 10^-9 rad,which is significantly less than the designated error budget,i.e.10^-6 rad,and thus will not affect the laser interferometry.

关键词： plasma turbulence gravitational wave detection laser interferometry

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Modulation of photocatalytic activity of SrBi_(2)Ta_(2)O_(9)nanosheets in NO removal by tuning facets exposure

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Journal of Materials Science & Technology 2022年第27期122卷 91-100页

作者： Nan Li Qiuhui Zhu Guimei Liu Qi Zhao Haiqin Lv Mingzhe Yuan Qingguo Meng Yingtang Zhou Jingkun Xu Chuanyi Wang School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China Guangzhou Institute of Industrial Intelligence(GIII) Guangzhou 511400China National Engineering Research Center for Marine Aquaculture Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316004China Flexible Electronics Innovation Institute(FEII) Jiangxi Science&Technology Normal UniversityNanchang 330006China

Photocatalysts with exposure of different crystal facets often show great differences in their photocatalytic activities due to differences in surface atomic arrangement and ***,the actual photoreaction mechanism of a specific crystal facet in photocatalysis deserves to be *** this paper,as a case study,Sr Bi_(2)Ta_(2)O_(9)photocatalyst with preferential facet exposure was explored for the photocatalytic removal of NO at a ppb *** efficiency of NO removal was remarkably improved by tuning the crystal exposure facet with high(200)facet exposure *** exposure of(200)crystal facet in Sr Bi_(2)Ta_(2)O_(9)(SBT)by thermal calcination at 800℃(SBT-800)leads to the highest NO removal activity of51%under a 300 W Xe lamp for 20 min;under visible light,SBT 800 achieves a 5-fold enhancement in NO removal efficiency compared to its counterpart,*** species capture experiments prove that the superoxide radical·O_(2)-is the main active species for the photocatalytic removal of NO,and surface selective deposition experiments conclude that(200)is the main electron-rich crystal plane,based on which the results of density functional theory(DFT)computation reveal the Bi O terminated nature of(001)crystal plane,where the models with both Bi O and Ta O terminated(001)planes were created and *** study reveals that Sr Bi_(2)Ta_(2)O_(9)with a larger exposure of(200)facet provides more active reduction sites,thereby reducing more O_(2)to·O_(2)-,which further oxidizes the adsorbed NO to NO_(2)-/NO_(3)-.The present work underlines the role of facet tuning in the photoactivity modulation for NO removal photocatalytically.

关键词： SrBi_(2)Ta_(2)O_(9) NO removal Facet exposure Photocatalysis DFT computation

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A dual-role of SARS-CoV-2 nucleocapsid protein in regulating innate immune response

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Signal Transduction and Targeted Therapy 2021年第10期6卷 2995-3008页

作者： Yinghua Zhao Liyan Sui Ping Wu Wenfang Wang Zedong Wang Yang Yu Zhijun Hou Guangyun Tan Quan Liu Guoqing Wang Center for Pathogen Biology and Infectious Diseases Key Laboratory of Organ Regeneration and Transplantation of the Ministry of EducationThe First Hospital of Jilin UniversityState Key Laboratory of Human-Animal Zoonotic infectious DiseasesChangchunChina College of Wildlife and Protected Area Northeast Forestry UniversityHarbinChina Department of Pathogenbiology The Key Laboratory of ZoonosisChinese Ministry of EducationCollege of Basic MedicineJilin UniversityChangchunChina Hospital of Stomatology Jilin UniversityChangchunChina School of Life Sciences and Engineering Foshan UniversityFoshanChina Institute of Animal Health Guangdong Academy of Agricultural SciencesGuangzhouChina

The recently emerged severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),which is the causative agent of ongoing global pan demic of COVID-19,may trigger imm uno suppression in the early stage and overactive immune resp onse in the late stage of infection;However,the un derlying mecha nisms are not well *** we dem on strated that the SARS-CoV-2 nucleocapsid(N)protein dually regulated innate immune responses,i.e.,the low-dose N protein suppressed type I interferon(IFN-I)signaling and inflammatory cytokines,whereas high-dose N protein promoted IFN-I signaling and inflammatory ***,the SARS-CoV-2 N protein dually regulated the phosphorylation and nuclear translocation of IRF3,STAT1,and *** on ally,low-dose N protein combined with TRIM25 could suppress the ubiquitination and activatio n of retinoic acidinducible gene I(RIG-I).Our findings revealed a regulatory mechanism of innate immune responses by the SARS-CoV-2 N protein,which would contribute to understanding the pathogenesis of SARS-CoV-2 and other SARS-like coronaviruses,and development of more effective strategies for controlling COVID-19.

关键词： interferon respiratory acute

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Altered gut microbiome in FUT2 loss-of-function mutants in support of personalized medicine for inflammatory bowel diseases

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Journal of Genetics and Genomics 2021年第9期48卷 771-780页

作者： Sijing Cheng Jun Hu Xianrui Wu Ji-An Pan Na Jiao Yichen Li Yibo Huang Xutao Lin Yifeng Zou Yuan Chen Lixin Zhu Min Zhi Ping Lan Guangdong Institute of Gastroenterology Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor DiseasesDepartment of Colorectal SurgeryThe Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhou 510655China School of Medicine Sun Yat-sen UniversityShenzhen 510080China Department of Gastroenterology The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhou 510655China

The FUT2 loss-of-function mutations are highly prevalent and are associated with inflammatory bowel disease(IBD).To investigate the impact of FUT2 loss-of-function mutation on the gut microbiota in patients with IBD,81 endoscopically confirmed IBD patients were genotyped and divided into 3 groups:homozygous for functional FUT2 genes(SeSe),with one copy of non-functional FUT2 gene(Sese),or homozygous for non-functional FUT2 genes(sese).Escherichia,which attaches to fucosylated glycoconjugates,was the only abundant genus exhibiting decreased abundance in sese *** with SeSe or Sese patients,sese patients exhibited higher abundance in CD8+inducing Alistipe and Phascolarctobacterium and Th17 inducing Erysipelotrichaceae ***-intuitively,butyrate-producing bacteria were more abundant in sese ***,metabolomics analysis found higher levels of butyrate in sese *** data support the hypothesis that FUT2 loss-of-function mutation participates in the IBD pathogenesis by decreasing binding sites for adherent bacteria and thus altering the gut *** abundances of adherent bacteria may allow the overgrowth of bacteria that induce inflammatory T cells,leading to intestinal *** FUT2 loss-of-function mutations are highly prevalent,the identification of T cell inducing bacteria in sese patients could be valuable for the development of personalized microbial intervention for IBD.

关键词： FUT2 Inflammatory bowel diseases Crohn’s disease Ulcerative colitis Secretor

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Single-Atom Pd–N_(3)Sites on Carbon-Defi cient g-C_(3)N_(4)for Photocatalytic H_(2)Evolution

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Transactions of Tianjin University 2021年第2期27卷 139-146页

作者： Guimei Liu Haiqin Lv Yubin Zeng Mingzhe Yuan Qingguo Meng Yuanhao Wang Chuanyi Wang Shenyang Institute of Automation GuangzhouChinese Academy of ScienceGuangzhou 511400China Hubei Key Laboratory of Accoutrement Technique in Fluid Machinery and Power Engineering Hubei 430072China Guangdong Engineering Technology Research Center for Environmental Purifi cation and Functional Materials Guangzhou 511400China SUSTech Engineering Innovation Center School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518000China

Photocatalytic hydrogen evolution is an attractive fi eld for future environment-friendly ***,fast recombination of photogenerated charges severely inhibits hydrogen effi ***-atom cocatalysts such as Pt have emerged as an eff ective method to enhance the photocatalytic activity by introduction of active sites and boosting charge separation with low-coordination ***,we demonstrated a new strategy to develop a highly active Pd single atom in carbondefi cient g-C_(3)N_(4)with a unique *** single-atom Pd–N_(3)sites constructed by oil bath heating and photoreduction process were confi rmed by HADDF-STEM and XPS *** of single-atom Pd greatly improved the separation and transportation of charge carriers,leading to a longer lifespan for consequent *** obtained singleatom Pd loaded on the carbon-defi cient g-C_(3)N_(4)showed excellent photocatalytic activity in hydrogen production with about 24 and 4 times higher activity than that of g-C_(3)N_(4)and nano-sized Pd on the same support,*** work provides a new insight on the design of single-atom catalyst.

关键词： Single-atom Pd g-C_(3)N_(4) Active sites Hydrogen Photocatalytic

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Discovery of Eucalyptin C,derived from the fruits of Eucalyptus globulus Labill.,as a novel selective PI3Kγinhibitor for immunosuppressive treatment

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Chinese Journal of Natural Medicines 2021年第11期19卷 844-855页

作者： HU Xiao-Long SHEN Wei WANG Rong LONG Huan WANG Quan FENG Jia-Hao PHAM Thi-Anh XIONG Fei YE Wen-Cai WANG Hao State Key Laboratory of Natural Medicines School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 210009China State Key Laboratory of Bioelectronics Jiangsu Laboratory for Biomaterials and DevicesSoutheast UniversityNanjing 210009China Institute of Traditional Chinese Medicine and Natural Products Jinan UniversityGuangzhou 510632China

The fruits of Eucalyptus globulus *** known to have a plenty of medicinal properties,such as anti-tumor,anti-inflammatory,and immunosuppressive *** previous study found that the phloroglucinol-sesquiterpene adducts in the fruits of *** were immunosuppressive active constituents,especially Eucalyptin C(EuC).Phosphoinositide 3-kinases-γ(PI3Kγ)plays a pivotal role in T cell mediated excessive immune *** this study,EuC was first discovered to be a novel selective PI3Kγinhibitor with an IC50 value of 0.9μmol·L^(−1) and selectivity over 40-fold towards the other PI3K *** docking,molecular dynamics simulation,and cellular thermal shift assay showed that EuC bound to PI3Kγ.Furthermore,EuC suppressed the downstream of PI3Kγto induce the apoptosis and inhibit the activation of primary spleen cells derived from allergic contact dermatitis *** work highlights the role of the fruits of *** as a source of bioactive plant with immunosuppressive activity.

关键词： Phosphoinositide 3-kinase-γ(PI3Kγ) Eucalyptin C Immunosuppressive effects Activated spleen cells Phloroglucinol-sesquiterpene adducts

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