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    Stiffening of nanoporous Au as a result of dislocation density increase upon characteristic length reduction

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    Preprintfile1.pdf
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    Type
    Preprint
    Authors
    Melis, Claudio
    Pia, Giorgio
    Sogne, Elisa cc
    Falqui, Andrea cc
    Giordano, Stefano
    Delogu, Francesco
    Colombo, Luciano
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Bioscience Program
    Date
    2021-11-24
    Permanent link to this record
    http://hdl.handle.net/10754/673825
    
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    Abstract
    Structure is the most distinctive feature of nanoporous metals. The intricate maze of rounded shapes, where ligaments and pores run after each other disorderly, strikes imagination no less than it imparts properties that, tuned by size effects, have no counterpart in the bulk form. Indisputably, nanoporous Au has been the absolute protagonist of the field of study, unveiling the disrupting potential of nanoporous metals in areas ranging from catalysis to energy and sensing. Here, we still focus on nanoporous Au, addressing the long-standing issue of mechanical properties in nanoporous metals. In particular, we investigate how Young's modulus changes with ligament size, being the porosity the same. Based on atomistic replicas generated starting from experimental tomographic evidence, atomistic simulations reveal that nanoporous Au stiffens as ligaments become finer, reproducing experimental findings obtained by nanoindentation of dealloyed samples. Ruled out surface stress effects, theoretical considerations relate stiffening to the dislocation density increase.
    Sponsors
    We acknowledge financial support by “Fondazione di Sardegna” under project ADVANCING (ADVAnced Nanoporous materials for Cutting edge engineerING ), call 2018 for basic research projects.
    Publisher
    arXiv
    arXiv
    2111.12499
    Additional Links
    https://arxiv.org/pdf/2111.12499.pdf
    Collections
    Biological and Environmental Science and Engineering (BESE) Division; Preprints; Bioscience Program

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