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Enhancing the thermal conductivity of nanofibrillated cellulose films with 1D BN belts formed by in-situ generation and sintering of BN nanosheets

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Journal of Advanced Ceramics 2023年第12期12卷 2257-2270页

作者： Baokai Wang Zheng Zhao Mengyi Li Mengyang Niu Jialu Tian Chang Yu Shiqin Wan Ming Yue Weiwei Xuan Wenbin Cao Zhaobo Tian Kexin Chen Qi Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The rapid miniaturization and high integration of modern electronic devices have brought an increasing demand for polymer-based thermal management materials with higher thermal *** nitride nanosheets(BNNs)have been widely used as thermally conductive fillers benefiting from the extremely high intrinsic thermal ***,the small lateral size and weak interface bonding of BNNs enabled them to only form thermally conductive networks through physical overlap,resulting in high interfacial thermal *** address this issue,an innovative strategy based on interface engineering was proposed in this ***-aspect-ratio boron nitride belts(BNbs)were successfully synthesized by carbon thermal reduction nitridation method through the in-situ generation and sintering of *** surface of BNb showed the sintering of numerous smaller-sized BNNs,which precisely addresses the issue of weak interfacial bonding between *** this basis,the as-synthesized BNbs were combined with nano-fibrillated cellulose(NFC)to prepare NFC/BNb composite films through a facile vacuum filtration *** to the thermally conductive network formed by the horizontal oriented arrangement of BNb and their particular morphological advantages,the NFC/BNb films demonstrated significantly higher in-plane thermal conductivity than that of NFC/BNNs films,achieving the highest value of 19.119 W·m^(−1)·K^(−1) at a 20 wt%filling *** addition,the NFC/BNb films also exhibited superior thermal stability,mechanical strength,flexibility,and electrical insulation performance,suggesting the significant application potential of the designed BNb fillers in the thermal management field.

关键词： boron nitride(BN) thermal management materials vacuum filtration flexible thermally conductive films

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Highly Reversible Li–Se Batteries with Ultra-Lightweight N,S-Codoped Graphene Blocking Layer

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Nano-Micro Letters 2018年第4期10卷 42-51页

作者： Xingxing Gu Lingbao Xin Yang Li Fan Dong Min Fu Yanglong Hou Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and Resources Chongqing Technology and Business University School of Chemical Engineering Shandong University of Technology College of Arts Chongqing Technology and Business University Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKLMMD) BIC-ESAT Department of Materials Science and Engineering College of Engineering Peking University

The desire for practical utilization of rechargeable lithium batteries with high energy density has motivated attempts to develop new electrode materials and battery systems. Here, without additional binders we present a simple vacuum filtration method to synthesize nitrogen and sulfur codoped graphene(N,S-G) blocking layer, which is ultra-lightweight, conductive, and free standing. When the N,S-G membrane was inserted between the catholyte and separator, the lithium–selenium(Li–Se)batteries exhibited a high reversible discharge capacity of 330.7 mAh g^(-1) at 1 C(1 C = 675 mA g^(-1)) after 500 cycles and high rate performance(over 310 mAh g^(-1) at 4 C) even at an active material loading as high as ～5 mg cm^(-2). This excellent performance can be ascribed to homogenous dispersion of the liquid active material in the electrode, good Li^+-ion conductivity, fast electronic transport in the conductive graphene framework, andstrong chemical confinement of polyselenides by nitrogen and sulfur atoms. More importantly, it is a promising strategy for enhancing the energy density of Li–Se batteries by using the catholyte with a lightweight heteroatom doping carbon matrix.

关键词： Li–Se batteries N,S-codoped Graphene Ultra-lightweight Free-standing vacuum filtration

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Preparation of Nano-composites Membranes with Graphic Oxides and Polylactic Acid

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Journal of Wuhan University of Technology(Materials Science) 2018年第4期33卷 995-998页

作者：贺妍王宗彦 School of Mechanical Engineering North University of ChinaTaiyuan 030051China

Organic polymer materials were used as a layer of adhesive into the graphene sheet between the layers to enhance the interaction force between the nano-structure to achieve excellent mechanical properties and barrier properties. PLA with good flowability and easy processing was selected. The mechanical properties and barrier properties of the graphene-based composites were improved by the use of PLA for good flowability, making it easy to enter the GO layer as a binder. Three methods of preparation of GO/PLA homogeneous composite membranes were designed by vacuum filtration. The experimental results show that the injection of PLA as a molecular binder into the GO layer can effectively mimic the nano-structure, and enhance the intergranular force of the graphene molecules and the compatibility with the polymer matrix.

关键词： nano-structure polylactic acid (PLA) graphic oxide (GO) vacuum filtration

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Surfactant-assisted fabrication of graphene frameworks endowing epoxy composites with superior thermal conductivity

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Chinese Chemical Letters 2020年第1期31卷 244-248页

作者： Fan Zhang Chen Ye Wen Dai Le Lv Qilong Yuan Kuan W.A.Chee Ke Yang Nan Jiang Cheng-Te Lin Zhaolin Zhan Dan Dai He Li Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Electrical and Electronic Engineering Faculty of Science and EngineeringUniversity of Nottingham Ningbo ChinaNingbo 315100China Laser Research Institute Shandong Academy of SciencesQingdao 226100China

With the rapid growth in electronic device performance,there has been an increasing demand for thermally conductive polymer composites to handle the thermal management issue,thus contributing to the great importance to develop the graphene framework,which is evaluated as the most promising reinforcements for enhancing the thermal conductivity of *** filtration is a common method to fabricate graphene framework,whereas,it is available to prepare a framework with centimeter-scale thickness by filtrating the graphene-water dispersion,due to the fact of sample cracking caused by the mismatch of surface tension between graphene and *** this work,a surfactantassisted strategy was proposed by adjusting the surface tension of the water close to that of graphene first,then performing a conventional filtration process,to fabricate graphene *** a result,a thick graphene framework(thickness:3 cm)was successfully prepared,and after embedding into epoxy,the framework endows the composite(13.6 wt%)with a high in-plane thermal conductivities of12.4 W/mK,which is equivalent to≈64 times higher than that of neat *** method is simple and compatible with the conventional filtration process,suggesting great potential for the mass-production of graphene framework to meet the practical application requirements.

关键词： Graphene framework Surfactant vacuum filtration Thermal conductivity Polymer composite

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Relationships between Diatom Abundances in Rat Organs and in Environmental Waters

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Current Medical Science 2021年第5期41卷 981-986页

作者： Liang REN Yi-qun CHEN Qian-li ZHOU Zun-zhong LIU Ying LI Quan LIU Department of Forensic Medicine Tongji Medical CollegeHuazhon^University of Science and TechnologyWuhan 430030China Hubei Key Laboratory of Forensic Science Hubei University of PoliceWuhan 430034China Guangdong Tongji Forensic Science Institute Foshan 516500China

Objective:A diagnosis of drowning remains one of the most challenging issues in forensic science,especially for decomposed *** analysis is considered as an encouraging method for diagnosing *** this study,we developed a drowned rat model using different diatom densities in ***:A total of 120 adult Sprague-Dawley rats were used and divided into six groups,wherein experimental groups 1-5 were drowned rats(group A)and postmortem submersion rats(group B)that were submerged in water with five different Cyclotella *** densities,while the remaining group was used as a blank *** combination of microwave digestion and vacuum filtration method was used to accomplish efficient tissue digestion and ascertain higher accuracy of diatom determinations within ***:The abundances of diatoms in the lungs,livers,and kidneys were significantly *** diatom abundances in the lungs,livers,and kidneys were directly proportional to the water diatom densities,and specific quantitative relationships could be approximated by separate regression equations for each organ ***,the trends associated with the diatom increases among organs slightly *** addition,the diatom abundances in the lungs,livers,and kidneys were all positively *** were not observed in the postmortem submersion groups nor in the blank control ***:The results of this study provide valuable information for establishing a quantitative diatom framework for informing future forensic medicine efforts.

关键词： drowning diatom test quantitative analysis lungs livers kidneys vacuum filtration

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Electrical properties of transparent conducting carbon nanotube films

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Frontiers of Optoelectronics 2009年第4期2卷 425-428页

作者： Yanli ZHAO Qiuyan MO Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science and Engineering Huazhong University of Science and Technology

Single walled-carbon nanotube（SWCNT） thin film is one of the candidates for the next-generation flexible and transparent conductive thin film, which is a crucial component in various applications such as electrodes of flat-panel displays, solar cells, light emitting diodes,and touch panels. An intensive research work is underway to develop thin and flexible SWCNT films. The most important requirement of an SWCNT thin film is that it should show a low sheet resistance coupled with a high transparency. In this work, thin films of SWCNTs are prepared by vacuum filtration. The electrical properties of the as-prepared, annealed and HNO3-treated SWCNT films have been investigated. It is found that the square resistance can be significantly changed upon anneal and HNO3-treatment. A room-temperature ethanol alcohol sensor based on the SWCNT film has also been demonstrated.

关键词： transparent electrode single walled-carbon nanotube (SWCNT) film vacuum filtration

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Ablation behaviour and mechanical performance of ZrB_(2)-ZrC-SiC modified carbon/carbon composites prepared by vacuum infiltration combined with reactive melt infiltration

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新型炭材料（中英文） 2024年第4期39卷 633-644页

作者： ZHANG Jia-ping SU Xiao-xuan LI Xin-gang WANG Run-ning FU Qian-gang Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials Northwestern Polytechnical UniversityXi’an 710072China

The development of advanced aircraft relies on high performance thermal-structural materials,and carbon/carbon com-posites(C/C)composited with ultrahigh-temperature ceramics are ideal ***,the traditional routes of compositing are either inefficient and expensive or lead to a non-uniform distribution of ceramics in the *** with the traditional C/C-ZrC-SiC composites prepared by the reactive melt infiltration of ZrSi_(2),C/C-ZrB_(2)-ZrC-SiC composites prepared by the vacuum infiltration of ZrB_(2) combined with reactive melt infiltration have the higher content and more uniform distribution of the introduced ceramic *** mass and linear ablation rates of the C/C-ZrB_(2)-ZrC-SiC composites were respectively 68.9%and 29.7%lower than those of C/C-ZrC-SiC composites prepared by reactive melt *** ablation performance was improved because the volatilization of B_(2)O_(3),removes some of the heat,and the more uniformly distributed ZrO_(2),that helps produce a ZrO2-SiO2 continu-ous protective layer,hinders oxygen infiltration and decreases ablation.

关键词： C/C composites ZrB_(2)-ZrC-SiC vacuum filtration Reactive melt infiltration Ablation.

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Bismuth-Complex-Incorporated Nanocellulose Sheet for Biomedical Application:A Review on New Nanocellulose Composites

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Journal of Clinical and Nursing Research 2023年第6期7卷 193-206页

作者： Kirubanandan Shanmugam P Dhanasekaran Deepa Priya R Narendhar Chandrasekar Ramachandran Balaji Saveetha School of Engineering SIMATSThandalamChennai 602107Tamil NaduIndia Department of Chemical Engineering Erode Sengunthar Engineering CollegeErode 638057Tamil NaduIndia Department of Biotechnology Aarupadai Veedu Institute of TechnologyPaiyanoorChennai 603104Tamil NaduIndia Department of BioNano Technology Gachon UniversitySeongnam-si 13120Gyeonggi-doRepublic of Korea Department of Biotechnology and Chemical Engineering National Taipei University of TechnologyTaipei 106Taiwan Province of China

Antibiotic resistance is one of the major issues in the medical field and a potential threat to human ***,newly emerging antimicrobial compounds failed to combat antimicrobial resistance developed by bacterial ***,a bismuth-based complex has been developed to eradicate antimicrobial-resistant microorganism *** complex is known as organobismuth(III)phosphinate,which is said to be a potential broad-spectrum antimicrobial *** complex has been incorporated into the nanocellulose suspension to fabricate a biomedical composite for various *** composite can be fabricated by two methods namely vacuum filtration and spray *** this paper,the surface and topography of the composite are investigated and discussed in terms of SEM micrographs and their antimicrobial *** review focuses on the organo-bismuth nanocellulose composite and its biomedical application in the future.

关键词： Bismuth complex Nanocellulose Nanocomposite Spray coating vacuum filtration Antimicrobial activity Antifungal activity

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