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The Young's modulus of three-dimensional self-assembled Ag nanocrystals, as so-called supracrystals, is correlated with the type of coating agent as well as the nanocrystal morphology. The Young's moduli of supracrystals of icosahedral Ag nanocrystals are measured in the range of tens to hundreds of megapascals revealing an extremely soft mechanical behavior. The alkylamine molecules used as coating agents weakly interact with the Ag nanocrystal surface favoring translational and orientational ordering of atomic lattice planes of nanocrystals. Under such experimental conditions, both the average distance between nanocrystals and the increase of the nanocrystal diameter control the measured Young's modulus: it increases with decreasing interparticle distance and increasing nanocrystal diameter. When dodecylamine (CNH) molecules are replaced by dodecanethiol (CSH), the orientational ordering between nanocrystals, produced from the same batch as CNH, disappears by inducing a drop in the Young's modulus. This is attributed to the formation of a "skin" at the nanocrystal surface causing a transition from shaped to spherical nanocrystals. Finally, by comparing with various studies performed in our group with Co and Au nanocrystals, we explain the formation of such extremely soft materials with Ag nanocrystals by both the strength of the binding between nanocrystals and coating agents and the ligand-ligand interactions.
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http://dx.doi.org/10.1039/c7cp02649h | DOI Listing |
J Phys Chem C Nanomater Interfaces
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Center for Transport Technologies, Battery Technologies, AIT Austrian Institute of Technology GmbH, Giefinggasse 2, Vienna 1210, Austria.
In this work, a battery layup consisting of a poorly flammable ionic liquid electrolyte and a poly(vinylidene fluoride--hexafluoropropylene) (PVdF-HFP) thermoplastic has been developed along with composite anode and cathode electrodes. The developed gel electrolyte exhibits feasible ionic conductivity of about 1 mS/cm at 30 °C. State-of-the-art active electrode materials, i.
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December 2024
Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, 37673, Republic of Korea.
This study investigates human semicircular canal (SCC) dynamics under off-center rotational conditions. Previous research has modeled human rotational perception and the dynamic response of the SCCs by assuming a centered rotation state, where the rotation axis aligns with the SCC's center. However, this assumption is not representative of most real-life rotational situations.
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December 2024
Department of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh.
This study investigated a composite material combining epoxy with hybrid jute (J) and glass (G) fibers. A straightforward and effective fabrication method was employed, utilizing five layers with various reinforcement materials. To identify the optimal combination, a comprehensive series of tests were conducted using a range of characterization instruments, including Scanning Electron Microscopy (SEM), Universal Testing Machine (UTM), pendulum impact tester, density measurement, specific gravity evaluation, water absorption, and swelling thickness tests.
View Article and Find Full Text PDFJ Biomed Mater Res A
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Institute for Fiber Engineering and Science (IFES), Interdisciplinary Cluster for Cutting Edge Research (ICCER), Shinshu University, Ueda, Japan.
This study aimed to develop polyvinyl alcohol (PVA) and kappa-carrageenan (κCA) biocomposite films using a Pickering emulsion technique for wound care applications. Juniper essential oil and modified sepiolite were incorporated to enhance functionality, with films prepared via solvent casting and characterized for structural, thermal, and mechanical properties. The PCOS-2 film exhibited the highest mechanical performance, with Young's modulus of 6.
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January 2025
Discipline of Mechanical, Manufacturing and Biomedical Engineering, Trinity College Dublin, Dublin 2, Ireland.
With no effective treatments for functional recovery after injury, spinal cord injury (SCI) remains one of the unresolved healthcare challenges. Human induced pluripotent stem cell (hiPSC) transplantation is a versatile patient-specific regenerative approach for functional recovery after SCI. Injectable electroconductive hydrogel (ECH) can further enhance the cell transplantation efficacy through a minimally invasive manner as well as recapitulate the native bioelectrical microenvironment of neural tissue.
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