Proceedings. International Meshing Roundtable最新文献_第2页

A Novel Microwave Treatment to Augment the Mechanical Properties of Polymeric Materials 一种提高高分子材料力学性能的新型微波处理方法

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.014014

{"title":"A Novel Microwave Treatment to Augment the Mechanical Properties of Polymeric Materials","authors":"","doi":"10.33263/proceedings22.014014","DOIUrl":"https://doi.org/10.33263/proceedings22.014014","url":null,"abstract":"The present study portrays a novel post-processing treatment by using microwave radiations for enhancing the mechanical properties of five commonly used engineering polymers, Poly-amide (PA), Poly-butylene-terephthalate (PBT), Poly-propylene (PP), Poly-carbonate (PC), Acrylonitrile-butadiene-styrene (ABS). The analysis revealed that the crystal structures of the polymers improved after the treatment due to a more favorable rearrangement of crystalline segments within the polymers. Furthermore, tensile properties and tribological performance of microwave treated polymers were found to be significantly better when compared to those of untreated counterparts. The tensile strength, elongation, and wear performance of PA increased by 51%, 286%, and 45%, respectively, only after a treatment of 20 seconds. A similar response was also exhibited by other polymers as well. It was noted that the optimum time for microwave treatment could vary depending on the different crystalline nature of the polymers. The degree of randomness in the molecular chains of semi-crystalline polymers is less; thus, it requires less treatment time. However, for amorphous polymers, as randomness increases, more time is needed. As such, post-processing microwave treatment of polymers has proven beneficial as a cost-effective, time-saving, and environment-friendly technique for enhancing material properties significantly.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76799558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electric and Dielectric Behavior of Purified Galactomannan Films 半乳甘露聚糖纯化膜的电性能和介电性能

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.033034

{"title":"Electric and Dielectric Behavior of Purified Galactomannan Films","authors":"","doi":"10.33263/proceedings22.033034","DOIUrl":"https://doi.org/10.33263/proceedings22.033034","url":null,"abstract":"This work aimed to extract, purify, and to characterize galactomannan from Adenanthera pavonina L. by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and impedance spectroscopy (IS). Galactomannans (Gal) are polysaccharides, commonly found in the seed endosperm of the Fabaceae family, presenting a chemical structure formed by mannose and galactose, with units connected by glycosidic bonds of D-mannopyranose β(1→4) and by D-galactopyranose α(1→6). Due to their physical-chemical properties and biocompatibility, this biopolymer can be integrated into a vast range of biomedical devices, for example, as biosensors. Galactomannan was extracted from seeds of Adenanthera pavonina L., precipitated in ethyl alcohol, dehydrated, pulverized, and hermetically stored. Galactomannan films purified at 100% were prepared at a concentration of 5% and characterized by FTIR, XRD, and IS. In FTIR, characteristic monosaccharides of Gal were identified as β-D-manopyranose at 814 cm-1 and α-D-galactopyranose at 871 cm-1. From the diffractogram of purified Gal. (GP100), two diffraction peaks are observed at 5.8º and 20º, since the natural interaction of polysaccharides with water, intermediated by ethanol, causes changes related to crystalline-amorphous transitions. IS measurements in the frequency range between 10 Hz and 1 MHz, at room temperature, revealed the existence of a non-Debye relaxation phenomenon, observed using the electrical modulus function formalism (M*) and impedance formalism (Z*), ascribed to the short-range movement of charge carriers. For the purified and crude galactomannan films, we observed that the electrical resistivity is very high, reaching a magnitude of 109 Ω.mm, at the low-frequency region, decreasing to 108 Ω.mm for frequencies higher than 10 kHz. Because of this high impedance characteristic and biocompatibility, purified galactomannan can be easily used as an insulating substrate in biosensors.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87626920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Looking at Electron Dynamics to Better Understand Photo-Active Materials 通过电子动力学来更好地理解光活性材料

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.003003

{"title":"Looking at Electron Dynamics to Better Understand Photo-Active Materials","authors":"","doi":"10.33263/proceedings22.003003","DOIUrl":"https://doi.org/10.33263/proceedings22.003003","url":null,"abstract":"The generation of free and energetic electrons is the key to the next generation of photo-voltaic and photo-catalysts. In order to produce such electrons, the sunlight is so far the most promising sustainable source of energy. However, the conversion efficiency from light to the liberation of a functional electron depends on numerous factors and processes that are difficult to account for. One of the reasons is the difficulty of monitoring the early electron dynamics such as the charge separation event and the subsequent electronic relaxation and migration. Here, I propose the use of ultrafast transient absorption spectroscopy to watch these electronic events “live” in the femto- to nano-seconds (10-15-10-9 sec.) time scales. In this presentation, I will demonstrate this technique on iron and copper oxides thin films. In this study, we produce ultrashort laser pulses to mimic sunlight and trigger charge separations that ultimately lead to the generation of the reactive oxygen species that confer the films their antibacterial properties. With this technique, we are able to harvest information such as the charge separation efficiency, electron dynamics, excited state’s bandgap energy, and even material deformation upon photo-excitation, all of which are key to understand, control and enhance the conversion process.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90874661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scaling-up Nanoparticle Beam Deposition for Green Synthesis of Advanced Materials 纳米粒子束沉积技术在新型材料绿色合成中的应用

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.011012

{"title":"Scaling-up Nanoparticle Beam Deposition for Green Synthesis of Advanced Materials","authors":"","doi":"10.33263/proceedings22.011012","DOIUrl":"https://doi.org/10.33263/proceedings22.011012","url":null,"abstract":"The deposition of size-controlled nanoparticles (atomic clusters) onto supports from the beam is a solvent-free, green route to small-scale manufacturing of functional nanomaterials. To translate the beautiful physics and chemistry of clusters into practical applications, e.g., coatings, catalysts, biochips, biomaterials, and photonic materials, significant scale-up of the rate of deposition is needed [1,2], while reducing the loss of material in the process (to say 1-10%). For example, the deposition rate needed for industrial catalyst R&D is 10mg/hour of clusters, while for bespoke pharmaceutical manufacturing, 1-10g/hour is required. In this talk, I will discuss both the fundamental aspects of deposited clusters at the atomic-scale – as revealed by aberration-corrected scanning transmission electron microscopy [3,4] – and the status of efforts to meet the scale-up challenge, with emphasis on our “Matrix Assembly Cluster Source” (MACS) [5]. Some first practical demonstrations [6-10] of deposited clusters in heterogeneous and electrocatalysis will be presented, showing attractive activities and selectivities [1, 6-10], as an illustration of what might be done in fields as diverse as surface engineering, theranostics, photonics, and neuromorphic.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90335031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Piezoelectric on Natural Fiber Reinforced Epoxy Composite for Wireless Energy Harvesting 用于无线能量收集的天然纤维增强环氧复合材料压电

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.020020

引用次数: 0

Silver Nanoparticle Deposition on Boron Nitride Surface 纳米银在氮化硼表面的沉积

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.021021

引用次数: 0

Twistronics: A Recent Avenue in van der Waals Heterostructures 扭转电子学:范德华异质结构的新途径

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.044044

{"title":"Twistronics: A Recent Avenue in van der Waals Heterostructures","authors":"","doi":"10.33263/proceedings22.044044","DOIUrl":"https://doi.org/10.33263/proceedings22.044044","url":null,"abstract":"Two-dimensional (2D) materials, the thinnest form of materials to ever occur in nature, have the potential to dramatically alter and revolutionize our material world. After the discovery of graphene, the most prominent representative of this class of materials, many other 2D crystals have been identified. Even if individual 2D materials own various interesting and unexpected properties, the stacking of such layers leads to ‘artificial vdW solids’ called van der Waals heterostructures (vdW HSs) that result in the emergence of new states of matter with novel functionalities. The vdW HSs not only depend on the combination of different 2D crystal but also on their rotational alignment opening the avenue for a new field called twistronics. Coupling between the two layers depends on the stacking angle, which can be used as an external degree of freedom to tune their optical and electronic properties. Apart from excitonic ground states, 2D transition metal dichalcogenides (TMDs) and their heterostructures offer an excellent platform to explore fascinating higher-order excitations such as trion, biexciton, interlayer exciton, hybrid exciton, moiré exciton, and so on. The emergence of these higher-order excitations mostly depends on the symmetry, temperature, and the band alignment of the heterobilayer systems.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83426143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

COVID-19 Global Healthcare System Failures: The Desperate Need for a Paradigm Shift for Better Medical Materials 2019冠状病毒病全球医疗系统失败:迫切需要更好的医疗材料的范式转变

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.015015

引用次数: 0

New nanotechnologies for Energy saving and Resiliency of the Built Environment 节能和建筑环境弹性的新纳米技术

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.050050

{"title":"New nanotechnologies for Energy saving and Resiliency of the Built Environment","authors":"","doi":"10.33263/proceedings22.050050","DOIUrl":"https://doi.org/10.33263/proceedings22.050050","url":null,"abstract":"The focus of this paper deals with innovative material and construction systems that incorporate nanotechnologies for improving their energy-saving performance. Recent developments in the world of phase change materials, specifically on organic PCMs, such as paraffin and bio-PCM aerogel, are presented; laboratory works are presented together with pilot projects in Toronto, where PCM-based system have been incorporated in high-performing buildings. Then, the paper shows recent advancements in super-insulating materials, specifically focusing on aerogel-enhanced blankets and panels, which have been developed at the BeTOP laboratory of the Ryerson University in Toronto, Ontario. Finally, the paper explores the potentialities of including innovative thermochromic coatings at the urban scale and shows the mutual benefits between buildings and communities that could be obtained through the adoption of previously mentioned nanotechnologies. The goal is to describe a pathway towards more sustainable and resilient communities. Using Toronto as a test case, the paper aims to comprehensively show that nanotechnologies offer a paradigm shift at the different scales of the built environment.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73204589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Active Roles of Water in Aqueous Assembly of Macromolecules 水在大分子水相组装中的活性作用

Proceedings. International Meshing Roundtable Pub Date : 2020-09-27 DOI: 10.33263/proceedings22.017017

引用次数: 0