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排序方式： 共有2719条查询结果，搜索用时 15 毫秒
911.
Gregory Ellson Xavier Carrier Jamie Walton Samsuddin Faisal Mahmood Kejia Yang Joshua Salazar Walter E. Voit 《应用聚合物科学杂志》2018,135(6)
Fused filament fabrication (FFF) is the most common form of additive manufacturing. Most FFF materials are variants of commercially available engineering plastics. Their performance when printed can widely vary, thus there is an increasing volume of research on alternative materials with thermal and mechanical performance optimized for FFF. In this work, thiol–isocyanate polymerization is used for the development of a one‐pot synthesis for polythiourethane thermoplastics for tough three‐dimensional (3D) printing applications. The thiol–isocyanate reaction mechanism allows for rapid polymer synthesis with minimal byproduct formation and few limitations on reaction conditions. The resulting elastomer has high toughness and a low melting point, making it favorable for use as a 3D printing filament. The elastomer outperforms commercial filaments in tension when printed. Considering the rapid advancement of additive manufacturing and the limitations of many engineering polymers with the 3D printing process, these results are encouraging for the development of bespoke 3D printing thermoplastics. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45574. 相似文献
912.
Sami A Al‐Hussain Abdelrhman O Ezzat Amany K Gaffer Ayman M Atta 《Polymer International》2018,67(2):166-177
Magnetite cryogel composites as macroporous crosslinked matrices have received wide attention and attract much interest in the water purification and desalination industry. They can be used to produce effective adsorbents with high adsorption rate, capacity and desorption for water pollutants. In this work, the incorporation of magnetite nanoparticles into cryogels by the in situ method is proposed to increase the dispersion of nanoparticles in the gel composites and to produce effective magnetic materials with high adsorption capacities. Ionic sodium‐2‐acrylamido‐2‐methylpropane sulfonate (Na‐AMPS) monomer was selected to prepare cryogels as the homopolymer or copolymers with 2‐hydroxyethyl methacrylate (HEMA) or N‐vinyl pyrrolidone (VP) by the crosslinking polymerization technique in the frozen state. Magnetite nanoparticles were introduced into the cryogel by the in situ co‐precipitation method after introducing iron cations into the cryogel networks. The surface morphologies, crystal structure, magnetite content, thermal stability and magnetic properties were determined for the cryogels and their magnetite composites. The magnetite cryogel composites show significantly enhanced methylene blue dye removal in short times with higher adsorption efficiencies and good regeneration to form an effective adsorbent for water treatment. © 2017 Society of Chemical Industry 相似文献
913.
R. Ahmed N. H. Faisal A. M. Paradowska M. E. Fitzpatrick 《Journal of Thermal Spray Technology》2012,21(1):23-40
The aim of this investigation was to nondestructively evaluate the residual stress profile in two commercially available alumina/substrate
coating systems and relate residual stress changes with the fracture response. Neutron diffraction, due to its high penetration
depth, was used to measure residual strain in conventional air plasma-sprayed (APS) and finer powder high velocity oxy-fuel
(HVOF (θ-gun))-sprayed Al2O3 coating/substrate systems. The purpose of this comparison was to ascertain if finer powder Al2O3 coatings deposited via θ-gun can provide improved residual stress and fracture response in comparison to conventional APS
coatings. To obtain a through thickness residual strain profile with high resolution, a partially submerged beam was used
for measurements near the coating surface, and a beam submerged in the coating and substrate materials near the coating-substrate
interface. By using the fast vertical scanning method, with careful leveling of the specimen using theodolites, the coating
surface and the coating/substrate interface were located with an accuracy of about 50 μm. The results show that the through
thickness residual strain in the APS coating was mainly tensile, whereas the HVOF coating had both compressive and tensile
residual strains. Further analysis interlinking Vickers indentation fracture behavior using acoustic emission (AE) was conducted.
The microstructural differences along with the nature and magnitude of the residual strain fields had a direct effect on the
fracture response of the two coatings during the indentation process. 相似文献
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917.
Navid Hussain Tongtong Fu Gabriel Marques Chittaranjan Das Torsten Scherer Uwe Bog Lukas Berner Irene Wacker Rasmus R. Schröder Jasmin Aghassi-Hagmann Michael Hirtz 《Advanced Materials Technologies》2021,6(11):2100650
A versatile liquid metal (LM) printing process enabling the fabrication of various fully printed devices such as intra- and interconnect wires, resistors, diodes, transistors, and basic circuit elements such as inverters which are process compatible with other digital printing and thin film structuring methods for integration is presented. For this, a glass capillary-based direct-write method for printing LMs such as eutectic gallium alloys, exploring the potential for fully printed LM-enabled devices is demonstrated. Examples for successful device fabrication include resistors, p–n diodes, and field effect transistors. The device functionality and easiness of one integrated fabrication flow shows that the potential of LM printing is far exceeding the use of interconnecting conventional electronic devices in printed electronics. 相似文献
918.
Nadeem Qaiser Asrar Nabil Damdam Sherjeel Munsif Khan Saleh Bunaiyan Muhammad Mustafa Hussain 《Advanced functional materials》2021,31(7):2007445
Stretchable electronics can be used for numerous advanced applications such as soft and wearable actuators, sensors, bio-implantable devices, and surgical tools because of their ability to conform to curvilinear surfaces, including human skin. The efficacy of these devices depends on the development of stretchable geometries such as interconnection-based configurations and the associated mechanics that helps to achieve optimum configurations. This work presents the essential mechanics of silicon (Si) island-interconnection structures, which include horseshoe and spiral interconnections, without reducing the areal efficiency. In particular, this study demonstrates the range of the geometrical parameters where they have a high stretchability and cyclic life. The numerical results predict the areas that are prone to breaking followed by experimental validation. The figure-of-merit for these configurations is achieved by mapping the fracture-free zones for in-plane and out-of-plane stretching with essential implications in stretchable and wearable system design. Furthermore, this work demonstrates the mechanical response for a range of materials (i.e., copper, gold, aluminum, silver, and graphene) that experience the plastic deformations in contrast to conventionally used Si-based devices that represent the extended usage for advanced stretchable electronic devices. The detailed mechanics of these configurations provides comprehensive guidelines to manufacture wearable and stretchable electronic devices. 相似文献
919.
Wenjing Liu Jie Chen Yuao Wei Yuxuan He Yuting Huang Mo Wei Yingjie Yu Nan Yang Weina Zhang Linghai Zhang Faisal Saleem Fengwei Huo 《Advanced functional materials》2024,34(48):2408732
The electrochemical reduction of nitrate to ammonia (NO3RR) is an effective route to ammonia synthesis with the characteristics of low energy input. However, the complex multi-electron/proton transfer pathways associated with this reaction may trigger the accumulation of competitive by-products. Herein, boron (B)-doped Cu electrode (denoted as B–Cu2O/Cu/CP) as “all-in-one” catalyst is prepared by one-step electrodeposition strategy. Caused by the B doping, the charge redistribution and local coordination environment of Cu2O/Cu species are modulated, resulting in the exposure of active sites on the Cu2O/Cu/CP catalyst. In-situ Fourier transform infrared spectroscopy and theoretical investigations demonstrate that both Cu2O and Cu sites modulated by B can effectively enhance the adsorption of NO3− and facilitate the conversion of intermediate by-products, thus promoting the direct reduction of NO3− to NH3. Consequently, a remarkable Faradaic efficiency of 92.74% can be obtained on B–Cu2O/Cu/CP catalyst with minimal accumulation of by-products. It is expected that this work, based on the heterogeneous B doping, will open a maneuverable and versatile way for the design of effective catalysts. 相似文献
920.
Yuki Fukatani Takaaki Wakui Suhaila Hussain Masamichi Kohno Yasuyuki Takata Khellil Sefiane 《传热工程》2016,37(7-8):729-740
The objective of this study is to clarify physical mechanisms involved in the evaporation of small (a few microliters) sessile drops. We aim to understand the relation between local thermal information at the solid–liquid interface and overall evaporation. An infrared (IR) camera and a charge-coupled device (CCD) camera were used to determine the temperature and heat flux distribution at the solid–liquid interface and the profile of the evaporating drop, respectively. The temperature distribution at the solid–liquid interface was determined using a multilayer substrate consisting of a silicon wafer coated with a thin thermal insulator that is partially transparent to IR. The liquids used were water and FC-72. The evaporation rate of water drops was found to occur mostly at the contact line. However, the heat transfer distribution at the liquid–solid interface was relatively uniform, indicating the heat transferred from the wall must be transported within the drop to the contact line. The mechanisms by which this occurs have yet to be determined. In contrast, the evaporation rate of FC-72 drops where hydrothermal waves were present was found to be proportional to the liquid–vapor interface area rather than the circumference of the drop, indicating a more uniform distribution of evaporation. 相似文献