Pub Date : 2020-09-27DOI: 10.33263/proceedings22.014014
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.
{"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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.033034
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.
本研究旨在通过傅里叶变换红外光谱(FTIR)、x射线衍射(XRD)和阻抗谱(IS)等方法提取、纯化和表征腺嘌呤半乳甘露聚糖。半乳糖甘露聚糖(Galactomannans, Gal)是一种常见于豆科植物种子胚乳的多糖，其化学结构由甘露糖和半乳糖组成，单元由d -甘露糖吡喃糖β(1→4)和d -半乳糖吡喃糖α(1→6)的糖苷键连接。由于其物理化学性质和生物相容性，这种生物聚合物可以集成到广泛的生物医学设备中，例如，作为生物传感器。半乳甘露聚糖是从腺花莲种子中提取的，在乙醇中沉淀，脱水，粉碎，并密封储存。以5%的浓度制备了纯度为100%的半乳甘露聚糖膜，并用FTIR、XRD和IS对其进行了表征。在FTIR中，Gal的特征单糖分别为β- d -氨基葡萄糖(814 cm-1)和α- d -半乳糖葡萄糖(871 cm-1)。从纯化的Gal. (GP100)的衍射图中，在5.8º和20º处观察到两个衍射峰，这是由于多糖与水的自然相互作用，以乙醇为中介，引起了与结晶-非晶态转变相关的变化。在10 Hz和1 MHz之间的频率范围内，在室温下，使用电模函数形式(M*)和阻抗形式(Z*)观察到非德拜弛豫现象的存在，归因于电荷载流子的短程运动。对于纯化和粗半乳甘露聚糖膜，我们观察到电阻率非常高，达到109 Ω的量级。Mm，在低频区域，降低到108 Ω。频率高于10khz。由于这种高阻抗特性和生物相容性，纯化的半乳甘露聚糖可以很容易地用作生物传感器的绝缘衬底。
{"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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.003003
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.
{"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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.011012
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.
{"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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.020020
Energy harvesting have a variety of application areas such as aircraft,automotive, medical this energy provides a route for the realization of autonomous and self-powered low power electronic devices, for wireless sensor networks, it eliminates the need for wireless or replacement batteries. The purpose of this paper is to develop and improve the capacity of energy harvesting. In this study, an MFC harvesting elements were laid up with the Natural fiber/epoxy composites that will be fabricated prapag at the fabrication stage, and co-within an autoclave that can convert mechanical vibrations to electrical energy will study to supply power a wireless impedance sensor node. Finally, a series of experimental tests will be verified.
{"title":"Piezoelectric on Natural Fiber Reinforced Epoxy Composite for Wireless Energy Harvesting","authors":"","doi":"10.33263/proceedings22.020020","DOIUrl":"https://doi.org/10.33263/proceedings22.020020","url":null,"abstract":"Energy harvesting have a variety of application areas such as aircraft,automotive, medical this energy provides a route for the realization of autonomous and self-powered low power electronic devices, for wireless sensor networks, it eliminates the need for wireless or replacement batteries. The purpose of this paper is to develop and improve the capacity of energy harvesting. In this study, an MFC harvesting elements were laid up with the Natural fiber/epoxy composites that will be fabricated prapag at the fabrication stage, and co-within an autoclave that can convert mechanical vibrations to electrical energy will study to supply power a wireless impedance sensor node. Finally, a series of experimental tests will be verified.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"127 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74862149","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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.021021
Silver nanoparticles (AgNPs) are used in the functionalization of many materials. For this purpose, in our study, Ag (I) particles were deposited on boron nitride (BN) surfaces by using AgNO3 salt and NaBH4 reductants. A wet chemical reduction method, was used for this process. After precipitation, the solution was passed through filter paper and dried. The silver and boron nitride phases were confirmed by the XRD analysis of the solid mixture obtained. The analysis of the particles accumulated on the surface was examined using SEM images. As a result, it was understood that AgNPs particles did not form oxidic compounds and occurred on BN surfaces, but agglomerations were observed in some regions.
{"title":"Silver Nanoparticle Deposition on Boron Nitride Surface","authors":"","doi":"10.33263/proceedings22.021021","DOIUrl":"https://doi.org/10.33263/proceedings22.021021","url":null,"abstract":"Silver nanoparticles (AgNPs) are used in the functionalization of many materials. For this purpose, in our study, Ag (I) particles were deposited on boron nitride (BN) surfaces by using AgNO3 salt and NaBH4 reductants. A wet chemical reduction method, was used for this process. After precipitation, the solution was passed through filter paper and dried. The silver and boron nitride phases were confirmed by the XRD analysis of the solid mixture obtained. The analysis of the particles accumulated on the surface was examined using SEM images. As a result, it was understood that AgNPs particles did not form oxidic compounds and occurred on BN surfaces, but agglomerations were observed in some regions.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80908299","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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.044044
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.
{"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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.015015
COVID-19 has highlighted numerous failures in our global healthcare system, from a system focussed on centralized hospitals to a lack of platform technologies to treat viral outbreaks. This presentation will highlight new materials being developed to aid in COVID-19 prevention, detection, and therapy. Rather than waiting for a year or longer for vaccine development, this presentation will highlight how nanomaterials can be a platform technology modified to treat every new virus that comes along. It will also highlight the use of at-home sensors and diagnostic kits that make it easy for patients to determine if they have been exposed to viruses rather than going to a facility (i.e., hospital) in which their infection could spread. Overall, this presentation will demonstrate how new materials will better prepare us for our next viral outbreak and begin to heal our current global healthcare system, which has demonstrated significant failures during the COVID-19 pandemic.
{"title":"COVID-19 Global Healthcare System Failures: The Desperate Need for a Paradigm Shift for Better Medical Materials","authors":"","doi":"10.33263/proceedings22.015015","DOIUrl":"https://doi.org/10.33263/proceedings22.015015","url":null,"abstract":"COVID-19 has highlighted numerous failures in our global healthcare system, from a system focussed on centralized hospitals to a lack of platform technologies to treat viral outbreaks. This presentation will highlight new materials being developed to aid in COVID-19 prevention, detection, and therapy. Rather than waiting for a year or longer for vaccine development, this presentation will highlight how nanomaterials can be a platform technology modified to treat every new virus that comes along. It will also highlight the use of at-home sensors and diagnostic kits that make it easy for patients to determine if they have been exposed to viruses rather than going to a facility (i.e., hospital) in which their infection could spread. Overall, this presentation will demonstrate how new materials will better prepare us for our next viral outbreak and begin to heal our current global healthcare system, which has demonstrated significant failures during the COVID-19 pandemic.","PeriodicalId":90703,"journal":{"name":"Proceedings. International Meshing Roundtable","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73807084","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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.050050
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.
{"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}
Pub Date : 2020-09-27DOI: 10.33263/proceedings22.017017
Aqueous self-assembly customarily focuses on the molecular interactions of assembling building blocks; the role of water is barely studied. The hydration of hydrophobic P+X- (P+: macromolecular phosphonium cation, X-: anion) is dependent on the ionic end groups, which is responsible for the consequent assembling behavior. The water interaction with the backbone was analyzed by FT-IR, and the dynamics were measured by low field-NMR spectroscopy. The combination of these two techniques reveals the effect of X- on hydration. When X- is I-, the ionic end group ordered water molecules that exerted a detectable long-range effect de-hydrating the backbone. The consequent hydrophobic interaction drove the aqueous assembly of P+I- into micelle-like aggregates with the ionic group exposed to water. In contrast, the ion pair with a hydrophobic anion of [BPh4]- was not able to hold water and did not deplete the hydration water. The hydrated backbone of P+[BPh4]- assembled into vesicles that were driven by hydration interactions. This elucidation at the molecular level is craved to progress aqueous supramolecular chemistry.
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