检索结果-内蒙古大学图书馆

science China Materials 2023年第3期66卷 1106-1113页

作者：朱恩惠庞凯陈彦儒刘森坪刘晓婷许震刘英军高超 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

石墨烯气凝胶(GAs)在解决下一代电子器件电磁屏蔽污染方面引起了广泛关注.但是,由于超轻石墨烯气凝胶在复杂环境中结构不稳定,其在电磁屏蔽的实际应用中仍面临巨大的挑战.在此,我们提出一类机械结构稳定的石墨烯气凝胶,其展示出优异可... 详细信息

石墨烯气凝胶(GAs)在解决下一代电子器件电磁屏蔽污染方面引起了广泛关注.但是,由于超轻石墨烯气凝胶在复杂环境中结构不稳定,其在电磁屏蔽的实际应用中仍面临巨大的挑战.在此,我们提出一类机械结构稳定的石墨烯气凝胶,其展示出优异可靠的电磁屏蔽性能.这类气凝胶呈现出面面堆叠的结构,在密度ρ=3.7 mg cm-3,高度1 m m时,电磁屏蔽效能可达到64.1 d B,比电磁屏蔽效能达到173,243 dB cm2g-1,远超现有报道的碳基材料.同时,石墨烯气凝胶具有优异的环境适应性,在机械形变、极端温度、燃烧及水下等环境中均可保持性能稳定.此外,制备的石墨烯气凝胶可通过真空袋装工艺进行包装运输,解决了超轻材料实际应用中低密度与大体积的矛盾,且在这一极端变形过程中材料结构和性能均未产生破坏.该研究为石墨烯气凝胶电磁屏蔽材料的实际应用铺平了道路,且拓展了其实际应用场景,比如航天、军事战机及海洋领域.

关键词：电磁屏蔽效能电磁屏蔽性能电磁屏蔽材料碳基材料极端温度海洋领域包装运输超稳定

来源：评论

学校读者我要写书评

暂无评论

Cyclic thermal treatment parameters of bagasse particle reinforced epoxy bio-composites for sustainable applications

引用

Discover polymers 2025年第1期2卷 1-22页

作者： Oladele, Isiaka Oluwole Falana, Samuel Olumide Ilesanmi Akinbamiyorin, Michael Onuh, Linus Nnabuike Taiwo, Anuoluwapo Samuel Adelani, Samson Oluwagbenga Olajesu, Olanrewaju Favor Department of Metallurgical and Materials Engineering Federal University of Technology Akure Nigeria Department of Materials Science and Engineering Iowa State University Ames USA Faculty of Materials and Chemical Engineering University of Miskolc Miskolc Hungary Department of School of Aerospace Transport and Manufacturing School of Aerospace Transport and Manufacturing Cranfield University Cranfield UK Materials Science and Engineering Program University of Colorado Boulder USA

The demand for sustainable, high-performance materials has led to increased interest in bio-based composites. However, optimizing the mechanical properties of such materials for engineering applications remains a challenge. This study addresses this gap by developing and characterizing an epoxy-based biocomposite reinforced with sugarcane bagasse particles, focusing on the influence of cyclic thermal treatment on its properties. The bagasse particles were chemically treated with 1 M NaOH to remove impurities, improve interfacial bonding with the epoxy matrix, and enhance the overall composite performance. The treated particles j were pulverized to 470 µm and incorporated into the epoxy matrix (0–20 wt%) using the hand layup method. The composites were divided into untreated and thermally treated groups, with the latter subjected to cyclic thermal treatment (100 °C for 3 h over 7 days). Mechanical, wear, and water absorption properties were evaluated, while fractured surface morphologies were analyzed using SEM. Results revealed that cyclic thermal treatment significantly enhanced the composites’ performance, with the 15 wt% heat-treated composite showing optimal properties: density of 1.102 g/cm3, flexural strength of 29.13 MPa, ultimate tensile strength of 103.50 MPa, impact strength of 3.49 kJ/m2, hardness of 64.70 HS, and wear indices of 0.034 mg. These findings demonstrate that alkali treatment and cyclic thermal treatment synergistically enhance the performance of bio-composites, making them suitable for diverse applications, including automotive, aerospace, and other engineering fields.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Intelligent IoT System for Continuous Water Quality Monitoring

Intelligent IoT System for Continuous Water Quality Monitori...

引用

Silchar Subsection Conference (SILCON), IEEE

作者： Purnendu Mandal Alak Roy Harjeet Nath Mainak Dhar Department of Information Technology Tripura University Tripura India Department of Chemical and Polymer Engineering Tripura University Tripura India Department of Computer Science and Engineering ICFAI University Tripura Agartala India

ISBN: (数字)9798331540821

ISBN: (纸本)9798331540838

Traditional water quality monitoring systems (WQMS) are often outdated and lack the intelligence to provide real-time analysis and alerts. This paper proposes a smart water quality monitoring system using a Raspberry Pi as the control unit, integrated with various sensors (pH, TDS, temperature, turbidity, and flow) for data collection. The system uses GSM and WiFi modules for data transmission to a cloud database, where machine learning algorithms analyze the data, providing alerts and predictions. Currently, this project is in the development phase. The data is collected successfully from a single water source and displayed on the Raspberry Pi screen, providing real-time monitoring of key water quality parameters. The next phase involves the integration of AI and machine learning, which is still under development. This will enhance the system's ability to process data, detect anomalies, and make accurate predictions about water quality.

关键词： Temperature sensors GSM Water quality Machine learning Turbidity Real-time systems Internet of Things Monitoring Wireless fidelity Water resources

来源：评论

学校读者我要写书评

暂无评论

Silicon oxide nanofibers using fungi mycelium as template material/from water purification to space insulation

RSC Applied Interfaces

引用

RSC Applied Interfaces 2024年第1期2卷 210-219页

作者： Birdsong, Björn K. Capezza, Antonio J. Nejati, Maryam Bjurström, Anton Li, Yuanyuan Jiménez-Quero, Amparo Olsson, Richard T. Department of Fiber and Polymer Technology School of Chemical Science and Engineering KTH Royal Institute of Technology Stockholm SE-100 44 Sweden Division of Glycoscience Department of Chemistry School of Engineering Sciences in Chemistry Biotechnology and Health Royal Institute of Technology Stockholm SE-106 91 Sweden NKT HV Cables Technology Consulting Västerås SE-721 78 Sweden Division of Industrial Biotechnology Department of Life Sciences Chalmers University of Technology Gothenburg 412 Sweden

Mycelium derived from Ganoderma lucidum was employed as a template for synthesising silicon oxide (SiOx) nanofibers. The intricate structures of mycelial hyphae fibrils were replicated with high precision using an ine...

Mycelium derived from Ganoderma lucidum was employed as a template for synthesising silicon oxide (SiO_x) nanofibers. The intricate structures of mycelial hyphae fibrils were replicated with high precision using an inexpensive commercial silane (3-aminopropyl)-triethoxysilane (APTES). Following the removal of the organic mycelium template phase at 600 °C, APTES was successfully converted to SiO_x. The resulting SiO_x fibres retained the morphology of the mycelium template, with a nearly identical fibre density to the original fibrous network. A fibril diameter reduction of approximately 43% was observed from 603 to 344 nm. All synthesised materials exhibited coherent structural integrity, sufficient for handling without breakage, although they were notably less mechanically flexible than the original mycelium template. The novel hybrid mycelium-3-aminopropyl-silsesquioxane fibre network and the thermally converted SiO_x network displayed notable liquid absorption properties. These materials allowed for the preferential absorption of oil or water, depending on the presence of the amino group functionality. Remarkably, the SiO_x network rapidly absorbed methylene blue-dyed water within 400 ms, demonstrating behaviour opposite to the virgin mycelium network. Additionally, the materials exhibited high thermal stability, withstanding flame exposure at approximately 1400 °C while maintaining their nano/micromorphology. This innovative approach of using “living” templates expands the range of morphologies that can be replicated in inorganic materials, enabling the creation of genetically and environmentally tuneable structures. The SiO_x nanofibers produced through this method have potential applications in various fields, including water purification, biosensors, catalytic support, and insulation. © 2025 RSC.

关键词：

来源：评论

学校读者我要写书评

暂无评论

P-210: Photolithography Patterning of Organic Light-Emitting Diodes Using Solvent Resistant Electron Transport Materials

引用

SID Symposium Digest of Technical Papers 2024年第1期55卷 2181-2183页

作者： Hyunjin Yu Eun Yeong So Kyunghyun Eun Byung Jun Jung Myungwoong Kim Jin-Kyun Lee Jun Yeob Lee School of Chemical Engineering Sungkyunkwan University 2066 Seobu-ro Jangan-gu Suwon-si Gyeonggi-do Republic of Korea 16419 Department of Materials Science and Engineering University of Seoul Seoul Republic of Korea 02504 Department of Chemistry and Chemical Engineering Inha University Incheon Republic of Korea 22212 Program in Environment and Polymer Engineering Inha University 100 Inha-ro Michuhol-gu Incheon Republic of Korea 22212

In this paper, we develop a novel approach to achieve ultra-high resolution in organic light-emitting diodes (OLEDs) through a photolithography patterning process. It is important to apply a solvent resistant electron transport layer (ETL) in the photolithography pattering of OLED because of solution coating process of photoresist on the ETL. Therefore, a solvent resistant ETL named 2,7-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-9,9 ′ -spirobi[fluorene] (SBF-Trz) was developed and employed as the ETL of OLEDs. The SBF-Trz demonstrated excellent solvent resistance during photolithography process and enabled device performances comparable to those of the conventional OLED without any photolithography process. It was found that the SBF-Trz ETL is appropriate as the ETL of the OLED patterned by photolithography due to good electron transport property, good stability, and good solvent resistance.

关键词： Organic light-emitting diodes (OLED) Electron Transport Layer (ETL) Photolithography Patterning Reactive Ion Etching (RIE) Micro display Ultra High resolution FMM-Free

来源：评论

学校读者我要写书评

暂无评论

Advances in powder nano-photocatalysts as pollutant removal and as emerging contaminants in water:Analysis of pros and cons on health and environment

Advanced Powder Materials

引用

Advanced Powder Materials 2024年第6期3卷 33-69页

作者： Sahil Thakur Abhijeet Ojha Sushil Kumar Kansal Navneet Kumar Gupta Hendrik C.Swart Junghyun Cho Andrej Kuznetsov Shuhui Sun Jai Prakash Department of Chemistry National Institute of Technology HamirpurHamirpur(H.P.)177005India Department of Materials Science and Engineering National Institute of Technology HamirpurHamirpur(H.P.)177005India Dr.S.S.Bhatnagar University Institute of Chemical Engineering and Technology Panjab UniversityChandigarh 160014India Center for Sustainable Technologies Indian Institute of Science(IISc)Gulmohar MargMathikereBengaluru 560012India Department of Physics University of the Free State(UFS)BloemfonteinZA 9300South Africa Department of Mechanical Engineering&Materials Science and Engineering Program State University of New York(SUNY)BinghamtonNY 13902-6000USA University of Oslo Department of Physics and Centre for Materials Science and NanotechnologyPO Box 1048 BlindernN-0316OsloNorway Institut National de la Recherche Scientifique(INRS)-CentreEnergie Materiaux et Telecommunications VarennesQuebec J3X 1P7Canada

Photocatalysis is an advanced oxidation process where light exposure triggers a semiconducting nanomaterial(nano-photocatalyst)to generate electron-hole(e^(-)/h^(+))pairs and free *** phenomenon is widely used for the photocatalysis-assisted removal of organic and other contaminants using wide range of nanophotocatalysts,offering an efficient approach to environmental ***,the introduction of powdered nano-photocatalysts into water systems often leads to unintended secondary pollution in the form of residual nano-photocatalysts,ion leaching,free radicals,toxic by-products *** practices potentially introduce emerging secondary contaminants into aquatic environments,posing risks to both aquatic life and human *** resulting chemical by-products and intermediates can effectively induce chronic toxicity,neurological and developmental disorders,cardiovascular defects,and intestinal ailments in humans and aquatic *** having a range of health and environmental consequences,this dark side of nano-photocatalysts has been comparatively less explored and discussed in the *** this review,the pros and cons of powder nanophotocatalysts are discussed in view of their advantages as well as disadvantages in wastewater *** discussion encompasses their classification based on composition,dimensions,structure,and activity,as well as recent advancements in improving their photocatalytic *** article also explores the recent advances on their applications in photocatalytic removal of various water pollutants/contaminants of emerging concern(i.e.,organic pollutants,micro/nano plastics,heavy ions,disinfections,etc.)Furthermore,an emphasis on the role of such nano-photocatalysts as emerging(secondary)contaminants in water system,along with a thorough discussion of latest studies related to the health and environmental issues,has been ***,it addresses critical issues in applying powder nano-photo

关键词： Powder nano-photocatalysts Advanced oxidation processes Wastewater treatment Pros and cons Emerging contaminants Health and environment issues

来源：评论

学校读者我要写书评

暂无评论

Adamantane-based low-dielectric-constant photocurable resin for 3D printing electronics

引用

Additive Manufacturing 2024年 82卷

作者： You, Jhu-Lin Liu, I.-Tseng Chen, Yu-Ho Balaji, Ramachandran Tung, Shih-Huang Liao, Ying-Chih Institute of Polymer Science and Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical & Materials Engineering Chung Cheng Institute of Technology National Defense University Taoyuan335 Taiwan Department of Electronics and Communication Engineering Koneru Lakshmaiah Education Foundation Andhra Pradesh 522302 India

In this work, a novel formulation is developed to prepare photocurable polyurethane acrylate (PUA) resin with a low dielectric constant for 3D printing applications. To amend the deficient electronic properties of regular 3D printed PUA materials, a symmetric polymer structure 1,3-adamantanediol (ADO) is introduced into the PUA polymer matrix to effectively decrease the dielectric constant. A low dielectric constant (Dk = 2.26) and a low loss tangent (Df = 0.018) at 10 GHz after formulation, are significantly lower than commercial PCB materials (High Tg FR-4, Dk = 4 and Df = 0.02). The modified PUA also exhibits great mechanical properties (tensile strength 12.02 MPa and elongation break at 111.35%) and can be further metalized with adhesive copper layers (5B adhesion test). With little addition of BN powder (1 wt%), the Df of PUA resin can also be effectively reduced (Df = 0.006), and the measured values of its metalized substrate antenna parameters are proven to be within the acceptable range for 5 G devices. The PUA resin can also be printed into complex 3D structures for 5 G flexible circuit board applications with good design flexibility, and the low dielectric constant provides the opportunity to replace traditional rigid FR-4 substrates for 5 G flexible board applications. © 2024 Elsevier B.V.

关键词： Polyurethanes

来源：评论

学校读者我要写书评

暂无评论

Biomimetic nanoporous aerogels from branched aramid nanofibers combining high heat insulation and compressive strength

引用

SmartMat 2021年第1期2卷 76-87页

作者： Jun Li Huaiyu Li Liwei Xu Lijun Wang Zhen Hu Li Liu Yudong Huang Nicholas A.Kotov Department of Chemical Engineering University of MichiganAnn ArborMichiganUSA Department of Materials Science and Engineering University of MichiganAnn ArborMichiganUSA Polymer Science and Engineering Harbin Institute of TechnologyHarbinChina Biointerfaces Institute University of MichiganAnn ArborMichiganUSA

Materials combining efficient thermal insulation and high mechanical properties are needed in many areas of *** aerogels provide a convenient design framework for thermal insulators,but they are often ***,the spectrum of advanced properties is constantly expanding while requirements to the degree of control of the three‐dimensional gel‐forming network is con-stantly ***,we report on biomimetic aramid nanofibers aerogels with the structure replicating articular cartilage,prepared by supercritical drying of 3D networks held together by hydrogen *** to the branching morphology of the nanofibers,the three‐dimensional nanoscale networks with extensive percolation and high interconnectivity can be *** aerogels showed high porosity with an average open pore size of 21.5 nm and corre-spondingly low specific density of 0.0081 g/*** aerogels also possess a high compressive strength of 825 kPa at a strain of 80%.Due to the unique aramid chemistry of the parent nanofibers,aramid aerogels combine low thermal con-ductivity of 0.026 W/m·K with high thermal stability up to 530°C,which is unusually high for polymeric and composite materials of any type,opening a broad range of applications from electronics to space travel.

关键词： aerogel branched nanofiber cartilage‐like fibril heat resistance

来源：评论

学校读者我要写书评

暂无评论

MYTHS OF NUCLEAR GRAPHITE IN WORLD WAR II, WITH ORIGINAL TRANSLATIONS

arXiv

引用

arXiv 2024年

作者： Park, Patrick J. Herzele, Sebastian Koeth, Timothy W. Program on Science and Global Security Princeton University United States College of Polymer Engineering HTL Bregenz Austria Department of Materials Science and Engineering University of Maryland College Park United States

We re-examine a common narrative that experimental errors by Walther Bothe in 1941 led Germany to abandon graphite as a reactor moderator during World War II. Using document-based nuclear archaeology, we first show that both American and German scientists used an incorrect carbon scattering cross section, thereby undermining the accuracy of all wartime data, including their conclusions on carbon’s absorption. Moreover, we argue that the availability of exceptionally pure petroleum coke in the United States, rather than any academic breakthrough, decisively enabled their production of nuclear-grade graphite. In contrast, Bothe’s Siemens electrographite had more boron contamination than any graphites considered in Fermi’s experiments, rendering it genuinely impractical as a moderator. By reframing the decision to eschew graphite as a deliberate decision rather than a mere experimental oversight, we believe the German decision was a rational consequence of a complex interplay between material constraints and wartime priorities. Copyright © 2024, The Authors. All rights reserved.

关键词： Bombing

来源：评论

学校读者我要写书评

暂无评论

Bending Energy-Driven Cooperative Patterning of 2D Colloids in Elastic 2D Fluids

arXiv

引用

arXiv 2024年

作者： Xin, Weiyue Santore, Maria M. Department of Chemical Engineering University of Massachusetts Amherst United States Department of Polymer Science and Engineering University of Massachusetts Amherst 120 Governors Drive AmherstMA01003 United States

Suspensions of colloidal microplates in contoured 2D elastic fluids sheets are dominated by the bending mechanics and shear rigidity of the plates and the contrasting in-plane shear flow of the 2D fluid. Using the phase separated phospholipid membranes of individual giant unilamellar vesicles as models of contoured 2D suspensions, where solid domains act as colloids in a fluid membrane, we explore bending elasticity-driven assembly. The plate-shaped domains are varied between 1-10 µm in diameter, with 4-100 plates per vesicle depending on size, contributing a solid area of 17 ±3%. Three classes of reversible plate arrangements evidence inter-plate attractions and repulsions: persistent hexagonal vesicle-encompassing quasi-lattices, persistent closely associated configurations (chains or concentrated lattices), and a dynamic disordered state. The vesicle-encompassing quasi-lattice is stable to vesicle dehydration by 30% relative to an inflated sphere. Excess area or membrane slack, for a fixed composition, dominates the preferred configuration while domain size and number contribute pattern intricacy. Different from the gradual variations in domain interactions and tunable positions in two-colloid systems, multibody interactions vary sharply within a particular range of excess area, producing cooperative assembly reminiscent of a phase transition. © 2024, CC BY-NC-ND.

关键词： Elasticity

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：