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Mechanical and Conductive Properties of Smart Cementitious Composites with Conductive Rubber Crumbs 导电橡胶屑智能胶凝复合材料的力学性能和导电性能
Pub Date : 2020-02-16 DOI: 10.30919/esmm5f711
Wenkui Dong, Wengui Li, K. Vessalas, Kejin Wang
Massive waste rubber products become very challenging because their disposal generates negative impacts on the ecological environments. The effect of conductive rubber crumbs replacing the fine aggregate on the physical, mechanical properties and electrical characteristics of cement composites were investigated in this study. The results show that the flowability of cement mortar increased when the rubber crumbs substitution rate lower than 10%, but decreased when the substitution rate higher than 10%. The compressive strengths of rubberized mortar were decreased with the increase of rubber crumbs. However, as the amount of rubber crumbs increased, less reduction on compressive strength was observed for the cement mortar at water-to-binder (W/B) ratio of 0.42, because of the better flowability. In terms of the electrical properties, both the near-surface resistivity and the volumetric resistivity of rubberized mortar were increased with the curing age because of the cement hydration. The near-surface resistivity of mortar was limitedly affected by conductive rubber crumbs, while the volumetric resistivity did gradually decrease with the increase of rubber content. The developed cement mortar containing recycled conductive rubber crumbs can be used for manufacturing self-sensing concrete.
大量废橡胶制品的处理对生态环境产生了负面影响,因此具有很大的挑战性。研究了导电胶屑替代细骨料对水泥复合材料物理、力学和电学性能的影响。结果表明:橡胶屑取代率低于10%时,水泥砂浆的流动性增加,高于10%时流动性下降;橡胶砂浆的抗压强度随橡胶屑的增加而降低。当水胶比(W/B)为0.42时,随着橡胶屑掺入量的增加,水泥砂浆抗压强度降低幅度较小,因为其流动性较好。在电性能方面,由于水泥水化作用,橡胶砂浆的近表面电阻率和体积电阻率随养护龄期的增加而增大。导电胶屑对砂浆近表面电阻率的影响有限,而体积电阻率随橡胶含量的增加而逐渐降低。所研制的再生导电橡胶屑水泥砂浆可用于制造自感混凝土。
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引用次数: 26
Materials Properties and Manufacturing Processes 材料特性和制造工艺
Pub Date : 2019-12-25 DOI: 10.30919/esmm5f616
Liping Wang
Materials properties highly depend on the manufacturing processes. In this issue, nine recent studies reported on how to understand and improve the (i.e., optical, mechanical, thermal, piezoelectric, etc) with the manufacturing processes for different applications. Sun et al. (doi: 10.30919/esmm5f605) provided a comphrensive review on the recent progress in hot embossing of polymer materials for micro/nanoscale manufacturing, including plate-to-plate, roll-to-plate, and roll-to-roll forms. Research in simulation and mold fabrication for hot embossing were discussed, the various applications of polymer processing were highlighted with systematic catalogs, and challenges and future directions were outlooked. In the area of piezoelectrics, polyvinylidene fluoride (PVDF) attracts much attention for energy harvesting because of its superior elastic properties, high flexibility and low cost. In the work by Han et al. (doi: 10.30919/esmm5f612), they developed a novel approach to increase the -phase concentration of electrospun PVDF nanofibers β during the manufacturing process. With comprehensive materials characterizations with SEM, Energy Dispersive X-ray, and infrared spectroscopy, they found that high-quality PVDF fibers can be obtained by high molecular weight with electrospinning, and confirmed the improved polarization of PVDF fibers with zinc oxide nanoparticle dopants. Wu el al. (doi: 10.30919/esmm5f601) demonstrated the improved interlaminar shear strength by 28.4% and impact toughness by 53.3% of carbon fibers unsaturated polyester composites by a vinyl ester sizing agent containing vinyl-functional carbon nanotubes. After studying the surface characteristics and interfacial properties of the composites before and after treated with the sizing agent, the improved wettability, chemical bonding and mechanical interlocking were found to be associated with the enhanced interfacial adhesion by the sizing agent. In the communication by Tian et al. (doi: 10.30919/esmm5f603), the microwave dielectric properties of Li Mg Zr O ceramics prepared 6 7 3 16
材料性能高度依赖于制造工艺。在这一期中,最近的九项研究报告了如何理解和改进(即光学,机械,热,压电等)与不同应用的制造工艺。Sun等人(doi: 10.30919/esmm5f605)全面回顾了用于微/纳米级制造的聚合物材料热压的最新进展,包括板对板,卷对板和卷对卷形式。讨论了热压成型的仿真研究和模具制造,系统地介绍了聚合物加工的各种应用,并展望了挑战和未来的发展方向。在压电材料领域,聚偏氟乙烯(PVDF)以其优异的弹性性能、高柔韧性和低成本等优点在能量收集领域备受关注。在Han等人的工作中(doi: 10.30919/esmm5f612),他们开发了一种在制造过程中增加静电纺PVDF纳米纤维β -相浓度的新方法。通过SEM、能量色散x射线和红外光谱对材料进行综合表征,发现静电纺丝可以获得高分子量的PVDF纤维,并证实了氧化锌纳米颗粒掺杂可以改善PVDF纤维的极化。Wu等(doi: 10.30919/esmm5f601)研究表明,使用含乙烯基功能碳纳米管的乙烯基酯施胶剂,碳纤维不饱和聚酯复合材料的层间剪切强度提高28.4%,冲击韧性提高53.3%。通过对施胶剂处理前后复合材料表面特性和界面性能的研究,发现施胶剂改善了复合材料的润湿性、化学键合性和机械联锁性,增强了复合材料的界面附着力。在Tian等人的通讯(doi: 10.30919/esmm5f603)中,研究了制备的Li Mg Zr O陶瓷的微波介电性能
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引用次数: 1
A New Machine Learning Algorithm to Optimize A Reduced Mechanism of 2-Butanone and the Comparison with Other Algorithms 一种新的优化2-丁酮还原机制的机器学习算法及其与其他算法的比较
Pub Date : 2019-12-23 DOI: 10.30919/esmm5f615
Yunpeng Wang, Shibo Liu, Jia Cheng, Xiao Wan, Wentao Feng, Nuo Yang, Chun Zou
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China *E-mail: nuo@hust.edu.cn; zouchun@hust.edu.cn # Y.W. and S.L. contributed equally to this work. 1,2# 1# 1 1,2 1,2 1,2* 1* Yunpeng Wang , Shibo Liu , Jia Cheng , Xiao Wan , Wentao Feng , Nuo Yang and Chun Zou View Article Online
华中科技大学煤炭燃烧国家重点实验室,武汉430074;华中科技大学中国能源与动力工程学院,武汉430074 *E-mail: nuo@hust.edu.cn;zouchun@hust.edu.cn # Y.W.和S.L.对这项工作贡献相同。1、2# 1# 1 1、2 1、2 1、2* 1*王云鹏、刘诗波、程佳、万晓、冯文涛、杨诺、邹春在线查看文章
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引用次数: 12
Amino Carbon Nanotube Modified Reduced Graphene Oxide Aerogel for Oil/Water Separation 氨基碳纳米管修饰的还原氧化石墨烯气凝胶用于油/水分离
Pub Date : 2019-12-18 DOI: 10.30919/esmm5f611
Jingyi Cai, Jing Tian, H. Gu, Zhanhu Guo
Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China Integrated Composites Lab (ICL), Department of Chemical & Biomolecular Engineering University of Tennessee, Knoxville, TN, 37966, USA *E-mail: hongbogu2014@tongji.edu.cn There authors are contributed equally. 1# 1# 1* 2 Jingyi Cai , Jing Tian , Hongbo Gu and Zhanhu Guo View Article Online
同济大学化学科学与工程学院,上海市化学评价与可持续发展重点实验室,上海200092;美国田纳西大学化学与生物分子工程系,中国集成复合材料实验室(ICL),美国田纳西州诺克斯维尔,37966 *E-mail: hongbogu2014@tongji.edu.cn蔡静一、田静、顾洪波、郭占湖在线查看文章
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引用次数: 56
Annealing Studies of Nanoporous Si Thin Films Fabricated by Dry Etch 干蚀刻法制备纳米多孔硅薄膜的退火研究
Pub Date : 2019-12-18 DOI: 10.30919/esmm5f608
Q. Hao, Yue Xiao, F. Medina
8, 9 temperature annealing, which indicates limited applications of these materials for power generation involving high temperatures. In this work, the possible shape change of nanoporous Si thin films is systematically studied for different annealing conditions. As a 20-μm-long bridge with nanopores, the studied Si thin films are patterned by electron beam lithography and then drilled with deep reactive ion etching (DRIE). It is found that the existence of a SiO /Si 2
8,9温度退火,这表明这些材料在高温发电方面的应用有限。本文系统地研究了纳米多孔硅薄膜在不同退火条件下可能发生的形状变化。采用电子束光刻技术将硅薄膜制成20 μm长的具有纳米孔的桥,然后用深度反应离子刻蚀(DRIE)进行钻孔。发现了SiO / si2的存在
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引用次数: 3
Approaches for Increasing the β-phase Concentration of Electrospun Polyvinylidene Fluoride (PVDF) Nanofibers 提高静电纺聚偏氟乙烯(PVDF)纳米纤维β相浓度的方法
Pub Date : 2019-12-18 DOI: 10.30919/esmm5f612
Guangshuai Han, Yen-fang Su, Yining Feng, Na Lu
The electrospun PVDF has gained much attentions due to its excellent piezoelectricity, high flexibility, and low-cost. This study aims to develop the electrospun PVDF nanofibers with high β-phase concentration and piezoelectricity. The samples were prepared by the PVDF solution with different molecular weights. The earth abundant Zinc Oxide nanoparticles serve as the inorganic dopant to increase the polarization of the PVDF film during manufacturing process. The materials characterization methods, including Scanning Electron Microscopy, Energy Dispersive X-Ray, and Fourier-transform infrared spectroscopy were utilized to identify the material properties. The results indicate that the high molecular weight PVDF is favorable for electrospinning to obtain the high quality nanofibers. Furthermore, doping Zinc Oxide nanoparticles can effectively promote the polarization of electrospun PVDF nanofibers. RESEARCH PAPER
静电纺聚偏氟乙烯纤维以其优异的压电性、高柔韧性和低成本而备受关注。本研究旨在开发具有高β相浓度和压电性的静电纺聚偏氟乙烯纳米纤维。采用不同分子量的PVDF溶液制备样品。在PVDF薄膜的制备过程中,富含地球元素的氧化锌纳米粒子作为无机掺杂剂,提高了PVDF薄膜的极化率。利用扫描电子显微镜、能量色散x射线和傅里叶变换红外光谱等表征方法对材料进行表征。结果表明,高分子量PVDF有利于静电纺丝制备高质量的纳米纤维。此外,掺杂氧化锌纳米粒子可以有效地促进静电纺PVDF纳米纤维的极化。研究论文
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引用次数: 14
Temperature-dependent Optical Characterization of VO2 Thin Film Prepared from Furnace Oxidation Method 炉氧化法制备VO2薄膜的温度依赖性光学表征
Pub Date : 2019-12-17 DOI: 10.30919/esmm5f607
Sydney Taylor, Jeremy Chao, Linshuang Long, Niko Vlastos, Liping Wang
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引用次数: 6
Multifunctional Lightweight Aggregate Containing Phase Change Material and Water for Damage Mitigation of Concrete 含相变材料和水的多功能轻骨料混凝土减损
Pub Date : 2019-12-11 DOI: 10.30919/esmm5f606
Wenyu Liao, Aditya Kumar, K. Khayat, Hongyan Ma
This paper presents an innovative concept of multifunctional lightweight aggregate, which is produced by loading phase change material (PCM) into the interior of lightweight sand (LWS) and sealing the surface pores using water. The PCM loaded in the LWS functionalizes it as a temperature management agent in concrete, and the water in surface pores enables internal curing. It has been found that the particle shape and pore structure of crushed expanded shale LWS makes it an ideal carrier for PCM, loading sufficient PCM and maintaining better (compared to natural sand) mechanical interlocking. When coupled with the internal curing effect, the LWS yields an interpenetrated interfacial transition zone with the cement paste, leading to a compressive strength comparable to natural sand mortar. The hydration products penetrated into the surface pores also helps stabilizing PCM in the LWS. However, any PCM residuum non-stabilized in LWS tends to compromise the strength. Under an optimized scenario, the LWS-PCM composite aggregate is produced by grading, PCM impregnation, rinsing, and water saturation. A mortar proportioned with this aggregate yields comparable 28-day strength to the reference mortar and a 63% lower autogenous
提出了一种将相变材料(PCM)加载到轻质砂(LWS)内部并用水密封表面孔隙的多功能轻质骨料的创新概念。加载在LWS中的PCM可以作为混凝土中的温度管理剂,表面孔隙中的水可以实现内部固化。研究发现,破碎后膨胀页岩LWS的颗粒形状和孔隙结构使其成为PCM的理想载体,可以加载足够的PCM,并保持更好的机械联锁(与天然砂相比)。当与内部养护效果相结合时,LWS与水泥浆体形成一个相互渗透的界面过渡区,其抗压强度可与天然砂砂浆相媲美。渗透到表面孔隙中的水化产物也有助于稳定LWS中的PCM。然而,任何在LWS中不稳定的PCM残留物往往会损害强度。在优化方案下,通过级配、PCM浸渍、漂洗和水饱和制备LWS-PCM复合骨料。与此骨料配比的砂浆的28天强度与参考砂浆相当,自强度降低63%
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引用次数: 23
Development and Application of Hot Embossing in Polymer Processing: A Review 热压成型技术在聚合物加工中的发展与应用综述
Pub Date : 2019-12-09 DOI: 10.30919/esmm5f605
S. Jingyao, Zhuang Jian, Ying Liu, Hong Xu, Jesse Horne, Evan K. Wujcik, Haichao Liu, J. Ryu, Daming Wu, Zhanhu Guo
Hot embossing of polymer materials is a promising technology for the fabrication of high quality and precision patterns on the micro/nano-scales. There are three basic forms of hot embossing including, plate-to-plate (P2P), roll-to-plate (R2P), and roll-to-roll (R2R) hot embossing. It also can be divided into isothermal and non-isothermal hot embossing according to the different temperature control modes of polymer substrates and structured molds. This review reports recent progress made of hot embossing methods in polymer processing and the efforts to shorten its processing period for commercial applications. Research and innovations in simulation of hot embossing process and mold fabrication are also comprehensively summarized. Within this review, microfluidics, light guide plate (LGP), and other novel applications of hot embossing are systematically cataloged. Finally, challenges and future trends of hot embossing in polymer processing are presented and forecasted.
聚合物材料的热压印技术是一种有前途的技术,可以在微/纳米尺度上制作高质量和高精度的图案。热压印有三种基本形式,包括板对板(P2P),卷对板(R2P)和卷对卷(R2R)热压印。根据聚合物基材和结构型模具的温控方式不同,也可分为等温热压和非等温热压。本文综述了热压印技术在高分子材料加工中的最新进展,以及为缩短热压印工艺周期而作出的努力。对热压成形过程仿真和模具制造方面的研究与创新进行了全面总结。本文对微流体、导光板和其他热压技术的新应用进行了系统的综述。最后,对聚合物热压加工面临的挑战和未来发展趋势进行了展望。
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引用次数: 29
Effect of A Vinyl Ester-Carbon Nanotubes Sizing Agent on Interfacial Properties of Carbon Fibers Reinforced Unsaturated Polyester Composites 乙烯基酯-碳纳米管施胶剂对碳纤维增强不饱和聚酯复合材料界面性能的影响
Pub Date : 2019-12-06 DOI: 10.30919/ESMM5F601
Zijian Wu, Lin Li, Ning Guo, Rongchen Yang, D. Jiang, Mingyu Zhang, Mingyan Zhang, Yudong Huang, Zhanhu Guo
1 College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, China 2 Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150040, China 3 School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China 4 Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, Northeast Forestry University, Harbin 150040, China 5 Integrated Composites Lab (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA *E-mail: tad@hrbust.edu.cn; zguo10@utk.edu Zijian Wu , Lin Li , Ning Guo , Rongchen Yang , Dawei Jiang , Mingyu Zhang , Mingyan Zhang , Yudong Huang and Zhanhu 1,2 1 2* 1 4 1 1,2 3 5* Guo View Article Online
1哈尔滨理工大学材料科学与工程学院,哈尔滨150040 2哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150040 3哈尔滨工业大学化学工程与技术学院,哈尔滨150001 4东北林业大学阻燃材料分子设计与制备黑龙江省重点实验室,哈尔滨1500405田纳西大学化学与生物分子工程系集成复合材料实验室,美国田纳西州诺克斯维尔37996 *E-mail: tad@hrbust.edu.cn;zguo10@utk.edu吴子健,李林,郭宁,杨荣臣,蒋大伟,张明宇,张明艳,黄玉东,张占虎1,2 1,2 * 1 4 1 1,2 3 5*郭
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引用次数: 36
期刊
ES Materials & Manufacturing
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