检索结果-南通市图书馆

Janus(BNNS/ANF)-(AgNWs/ANF)thermal conductivity composite films with superior electromagnetic interference shielding and Joule heating performances

引用

Nano research 2022年第5期15卷 4747-4755页

作者： Yixin Han Kunpeng Ruan Junwei Gu research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Highly thermal conductivity materials with excellent electromagnetic interference shielding and Joule heating performances are ideal for thermal management in the next generation of communication industry,artificial intelligence and wearable *** this work,silver nanowires(AgNWs)are prepared using silver nitrate as the silver source and ethylene glycol as the solvent and reducing agent,and boron nitride(BN)is performed to prepare BN nanosheets(BNNS)with the help of isopropyl alcohol and ultrasonication-assisted peeling method,which are compounded with aramid nanofibers(ANF)prepared by chemical dissociation,respectively,and the(BNNS/ANF)-(AgNWs/ANF)thermal conductivity and electromagnetic interference shielding composite films with Janus structures are prepared by the"vacuum-assisted filtration and hot-pressing"***(BNNS/ANF)-(AgNWs/ANF)composite films exhibit"one side insulating,one side conducting"performance,the surface resistivity of the BNNS/ANF surface is 4.7×10^(13) Ω,while the conductivity of the AgNWs/ANF surface is 5,275 S/*** Janus(BNNS/ANF)-(AgNWs/ANF)composite film with thickness of 95 pm has a high in-plane thermal conductivity coefficient of 8.12 W/(m·K)and superior electromagnetic interference shielding effectiveness of 70 *** obtained composite film also has excellent tensile strength of 122.9 MPa and tensile modulus and 2.7 *** also has good temperature-voltage response characteristics(high Joule heating temperature at low supply voltage(5 V,215.0℃),fast response time(10 s)),excellent electrical stability and reliability(stable and constant real-time relative resistance under up to 300 cycles and 1,500 s of tensile-bending fatigue work tests).

关键词： thermal conductivity composite film Janus structure aramid nanofibers electromagnetic interference shielding performance Joule heating

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Breaking Through Bottlenecks for Thermally Conductive Polymer Composites:A Perspective for Intrinsic Thermal Conductivity,Interfacial Thermal Resistance and Theoretics

引用

Nano-Micro Letters 2021年第7期13卷 118-126页

作者： Junwei Gu Kunpeng Ruan MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072P.R.China

Rapid development of energy,electrical and electronic technologies has put forward higher requirements for the thermal conductivities of polymers and their ***,the thermal conductivity coefficient(λ)values of prepared thermally conductive polymer composites are still difficult to achieve expectations,which has become the bottleneck in the fields of thermally conductive polymer *** at that,based on the accumulation of the previous research works by related researchers and our research group,this paper proposes three possible directions for breaking through the bottlenecks:(1)preparing and synthesizing intrinsically thermally conductive polymers,(2)reducing the interfacial thermal resistance in thermally conductive polymer composites,and(3)establishing suitable thermal conduction models and studying inner thermal conduction mechanism to guide experimental ***,the future development trends of the three above-mentioned directions are foreseen,hoping to provide certain basis and guidance for the preparation,researches and development of thermally conductive polymers and their composites.

关键词： Thermally conductive polymer composites Intrinsic thermal conductivity Interfacial thermal resistance Thermal conduction models Thermal conduction mechanisms

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thermally conductive polyvinyl alcohol composite films via introducing hetero-structured MXene@silver fillers

引用

Nano research 2023年第5期16卷 7820-7828页

作者： Mukun Li Yuyao Sun Dianying Feng Kunpeng Ruan Xia Liu Junwei Gu Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shandong Nonmetallic Materials Institute Jinan 250031China

Ag nanoparticles were in-situ grown on the surface of MXene nanosheets to prepare thermally conductive hetero-structured MXene@Ag *** polyvinyl alcohol(PVA)as the polymer matrix,thermally conductive MXene@Ag/PVA composite films were fabricated by the processes of solution blending,pouring,evaporative *** the same mass fraction,MXene@Ag-III(MXene/Ag,2:1,w/w)presents more significant improvement in thermal conductivity coefficient(λ)than MXene@Ag,single MXene,Ag,simply blending MXene/***@Ag-III/PVA composite films show dual functions of excellent thermal conductivity and electromagnetic interference(EMI)*** the mass fraction of MXene@Ag-III is 60 wt.%,the in-planeλ(λ_(∥)),through-planeλ(λ_(⊥)),EMI shielding effectiveness(EMI SE)are 3.72 and 0.41 W/(m∙K),32 dB,which are increased by 3.1,1.3,105.7 times than those of pure PVA film(0.91 and 0.18 W/(m∙K),0.3 dB),*** 60 wt.%MXene@Ag-III/PVA composite film also has satisfying mechanical and thermal properties,with Young’s modulus,glass transition temperature,heat resistance index of 3.8 GPa,58.5 and 175.3℃,respectively.

关键词： hetero-structured MXene@Ag fillers polyvinyl alcohol composite films thermal conductivity electromagnetic interference shielding

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Highly Thermally Conductive Polydimethylsiloxane Composites with Controllable 3D GO@f-CNTs Networks via Self-sacrificing Template Method

引用

Chinese Journal of Polymer Science 2024年第7期42卷 897-906,I0005页

作者： Shuang-Shuang Wang Dian-Ying Feng Zhi-Ming Zhang Xia Liu Kun-Peng Ruan Yong-Qiang Guo Jun-Wei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an710072China Shandong Institute of Nonmetallic Materials Jinan250031China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an710072China

Constructing controllable thermal conduction networks is the key to efficiently improve thermal conductivities of polymer *** this work,graphite oxide(GO)and functionalized carbon nanotubes(f-CNTs)are combined to prepare“Line-Plane”-like hetero-structured thermally conductive GO@f-CNTs fillers,which are then performed to construct controllable 3D GO@f-CNTs thermal conduction networks via selfsacrificing template method based on oxalic ***,thermally conductive GO@f-CNTs/polydimethylsiloxane(PDMS)composites are fabricated via casting *** the size of oxalic acid is 0.24 mm and the volume fraction of GO@f-CNTs is 60 vol%,GO@f-CNTs/PDMS composites present the optimal thermal conductivity coefficient(λ,4.00 W·m^(-1)·K^(-1)),about 20 times that of theλof neat PDMS(0.20 W·m^(-1)·K^(-1)),also much higher than theλ(2.44 W·m^(-1)·K^(-1))of GO/f-CNTs/PDMS composites with the same amount of randomly dispersed ***,the obtained GO@f-CNTs/PDMS composites have excellent thermal stability,whoseλdeviation is only about 3%after 500 thermal cycles(20-200℃).

关键词： Polydimethylsiloxane Hetero-structured thermally conductive fillers Self-sacrificing template Thermal conduction networks

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Litter quality and decomposer complexity co-drive effect of drought on decomposition

引用

Forest Ecosystems 2024年第3期11卷 329-338页

作者： Shumei Wang Junwei Luan Siyu Li Jinhao Ma Lin Chen Yi Wang Shirong Liu Sanya research base International Centre for Bamboo and RattanSanya572022China Institute of Resources and Environment Key Laboratory of Bamboo and Rattan Science and Technology of National Forestry and Grassland AdministrationInternational Centre for Bamboo and RattanBeijing100102China Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijing100091China Experimental Center of Tropical Forestry Chinese Academy of ForestryPingxiang532600China Institute of Qinghai-Tibetan Plateau Southwest Minzu UniversityChengdu610041China

Litter decomposition is key to ecosystem carbon(C)and nutrient cycling,but this process is anticipated to weaken due to projected more extensive and prolonged *** how litter quality and decomposer community complexity regulate decomposition in response to drought is less ***,in a five-year manipulative drought experiment in a Masson pine forest,leaf litter from four subtropical tree species(Quercus griffthii Hook.f.&Thomson ex Miq.,Acacia mangium Willd.,Pinus massoniana Lamb.,Castanopsis hystrix Miq.)representing different qualities was decomposed for 350 d in litterbags of three different mesh sizes(i.e.,0.05,1,and 5 mm),respectively,under natural conditions and a 50%throughfall rain exclusion *** of increasing mesh sizes discriminate decomposer communities(i.e.,microorganisms,microorganisms and mesofauna,microorganisms and meso-and macrofauna)that access the litter and represent an increasing *** amount of litter C and nitrogen(N)loss,and changes in their ratio(C/N_(loss)),as well as small and medium-sized decomposers including microorganisms,nematodes,and arthropods,were *** found that drought did not affect C and N loss but decreased C/N_(loss)(i.e.,decomposer N use efficiency)of leaf litter irrespective of litter quality and decomposer ***,changes in the C/N_(loss)and the drought effect on C loss were both dependent on litter quality,while drought and decomposer complexity interactively affected litter C and N *** decomposer community complexity enhanced litter decomposition and allowing additional access of meso-and macro-fauna to litterbags mitigated the negative drought effect on the microbial-driven ***,both the increased diversity and altered trophic structure of nematode due to drought contributed to the mitigation effects via cascading *** results show that litter quality and soil decomposer community complexity co-drive the effect of

关键词： Arthropod Drought Decomposer community Nutrient cycling Nematode

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

3D打印调控铜线/聚乳酸复合材料的导热通路长度和数量

引用

Science China Materials 2023年第10期66卷 4012-4021页

作者：马腾博阮坤鹏郭永强韩懿鑫顾军渭 Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Chemistry Beihang UniversityBeijing 100191China

导热通路对理解导热高分子复合材料的导热行为至关重要,但目前有关导热通路属性(长度、数量)对高分子复合材料导热系数的影响机制缺乏深入研究.本文采用3D打印技术制备了铜线(Cw)导热通路长度和数量可控的一维铜线/聚乳酸(1D-Cw/PLA)导... 详细信息

导热通路对理解导热高分子复合材料的导热行为至关重要,但目前有关导热通路属性(长度、数量)对高分子复合材料导热系数的影响机制缺乏深入研究.本文采用3D打印技术制备了铜线(Cw)导热通路长度和数量可控的一维铜线/聚乳酸(1D-Cw/PLA)导热复合材料,建立了针对一维导热通路的高分子复合材料的导热模型,明晰了其导热通路属性与其导热性能的定量关系.相同Cw用量下,1D-Cw/PLA导热复合材料的面内导热系数与导热通路的数量和长度呈正相关.采用本文构建的导热模型和经验方程对1D-Cw/PLA复合材料的导热系数进行预测,95%的置信度表明预测值与实测值无显著差异.

关键词： 3D printing thermally conductive composites thermal conduction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Additive manufacturing of magnesium and its alloys: process-formabilitymicrostructure-performance relationship and underlying mechanism

引用

International Journal of Extreme Manufacturing 2023年第4期5卷 247-290页

作者： Shang Sui Shuai Guo Dong Ma Can Guo Xiangquan Wu Zhongming Zhang Chunjie Xu Dan Shechtman Sergei Remennik Daniel Safranchik Rimma Lapovok School of Materials Science and Engineering Xi’an University of TechnologyXi’anShaanxi 710048People’s Republic of China Xi’an Shechtman Nobel Prize New Materials Institute Xi’an 710048People’s Republic of China Xi’an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi’anShaanxi 710048People’s Republic of China School of Materials Science and Engineering Liaocheng UniversityLiaochengShandong 252059People’s Republic of China Department of Materials Science and Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel Israel Institute of Metals Technion CityHaifa 3200003Israel Institute for Machine Elements Engineering Design and ManufacturingFreiberg 09599Germany Geelong Waurn Ponds Campus Deakin UniversityPigdons RoadGeelongVic 3216Australia

Magnesium and its alloys,as a promising class of materials,is popular in lightweight application and biomedical implants due to their low density and good *** manufacturing(AM)of Mg and its alloys is of growing interest in academia and *** domain-by-domain localized forming characteristics of AM leads to unique microstructures and performances of AM-process Mg and its alloys,which are different from those of traditionally manufactured ***,the intrinsic mechanisms still remain unclear and need to be in-depth ***,this work aims to discuss and analyze the possible underlying mechanisms regarding defect appearance and elimination,microstructure formation and evolution,and performance improvement,based on presenting a comprehensive and systematic review on the relationship between process parameters,forming quality,microstructure characteristics and resultant ***,some key perspectives requiring focus for further progression are highlighted to promote development of AM-processed Mg and its alloys and accelerate their industrialization.

关键词： additive manufacturing magnesium alloys underlying mechanisms forming quality microstructure characteristics and properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bornyl acetate extracted from Sharen(Fructus Amomi)inhibits proliferation,invasion and induces apoptosis by suppressing phosphatidylinositol-3-kinase/protein kinase B signaling in colorectal cancer

引用

Journal of Traditional Chinese Medicine 2023年第6期43卷 1081-1091页

作者： LI Xiaohua DUAN Zhihang YUE Jianjun ZHANG Yongyu LI Yihang LIU Shifang NIE Qu YANG Depo ZHANG Lixia School of Traditional Dai-Thai Medicine West Yunnan University of Apllied ScienceJinghong 666100China Institute of Medicinal Plant Development Chinese Academy of Medical SciencesJinghong 666100China Yunnan Branch Institute of Medicinal Plant DevelopmentChinese Academy of Medical SciencesYunnan Key Laboratory of Southern Medicine UtilizationJinghong 666100China

OBJECTIVE:To investigate the antitumor effects of bornyl acetate(BA)isolated from Sharen(Fructus Amomi)in colorectal cancer(CRC)and the underlying ***:SW480 and HT29 cells were treated with increasing doses of BA in order to determine its antitumor effects in *** viability,colony formation,cell cycle,and apoptosis as well as migration and invasion were assessed using various *** addition,the in vivo antitumor effects of BA were assessed using a xenograft mouse *** then assessed the mechanism of action of BA by conducting pathway activator-mediated rescue experiments and assessed the protein levels by Western blot ***:BA showed anti-CRC tumor activities in vitro by suppressing cell proliferation and colony formation,inducing apoptosis,blocking cell cycle,and inhibiting migration and *** effects were mediated via suppression of the phosphatidylinositol-3-kinase/protein kinase B(PI3K/AKT)*** the tumor xenograft experiment,BA was found to repress tumor growth in vivo with low ***:The results demonstrated that BA exerts antitumor effects by suppressing the PI3K/AKT pathway,with low ***,BA might be a potential novel therapeutic agent for CRC.

关键词： bornyl acetate colorectal neoplasms phosphatidylinositol 3-kinase protein kinases B signal transduction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Risk of extended viral shedding of Omicron BA.2 in Shanghai:Implications for vaccination strategy optimization

引用

Chinese Medical Journal Pulmonary and Critical Care Medicine 2023年第4期1卷 241-248页

作者： Jingwen Huang Lin Huang Jing Xi Yong Li Jianping Zhou Zhiyao Bao Qijian Cheng Qingyun Li Min Zhou Ren Zhao Yanan Li Department of Pulmonary and Critical Care Medicine Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China Institute of Respiratory Diseases Shanghai Jiao Tong University School of MedicineShanghai 200025China Shanghai Key Laboratory of Emergency Prevention Diagnosis and Treatment of Respiratory Infectious DiseasesShanghai 200025China Medical Department Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China Department of General Surgery Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China

Background:In late March 2022,an outbreak of coronavirus disease 2019(COVID-19)caused by the Omicron BA.2 strain occurred in Shanghai,*** retrospective study aimed to investigate the clinical characteristics,laboratory parameters,and vaccine protectiveness related to this disease in ***:We conducted a single-center retrospective study on 735 patients with COVID-19 hospitalized from March 17 to May 14,*** characteristics were analyzed based on vaccination status and viral shedding time(VST).The least absolute shrinkage and selection operator(LASSO)regression and 5-fold cross-validation were applied to screen factors linked to the rate of the *** linear models were further applied to estimate the odds ratios for factors influencing the ***:The median VST of unvaccinated patients was 13(11-16)days,which was longer than that of patients vaccinated with one or two doses(11[9-13]days)and with completed booster doses(11[8-12]days).A LASSO regression model and 5-fold cross-validation showed that age of≥60 years(β=0.01),pneumonia(β=0.53),and higher number of comorbidities(β=0.69)were positively associated with the VST,whereas the platelet count(β=-8.0×10-5)was inversely associated with the *** analysis revealed that the number of vaccinations was significantly associated with a decreased VST among patients with renal dysfunction(odds ratio[OR],0.65;95%confidence interval[CI],0.44-0.97;P=0.034)and patients with two or more comorbidities(OR,0.09;95%CI,0.03-0.28;P<0.001).The lymphocyte count was significantly associated with a decreased VST among patients aged<60 years(OR,0.51;95%CI,0.30-0.85;P=0.011),patients with normal renal function(OR,0.41;95%CI,0.21-0.80;P=0.009),and patients with fewer than two comorbidities(OR,0.49;95%CI,0.30-0.80;P=0.005).Conclusion:Our preliminary results suggest that the complete and booster vaccination contributes to the viral clearance of Omicron BA.2 variants,while the protectiveness of vacci

关键词： Omicron Vaccination status Viral shedding Platelet Lymphocyte

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：