Nanograded artificial nacre with efficient energy dissipation  

作　　者：Yu-Feng Meng Cheng-Xin Yu Li-Chuan Zhou Li-Mei Shang Bo Yang Qing-Yue Wang Xiang-Sen Meng Li-Bo Mao Shu-Hong Yu 

机构地区：[1]Department of Chemistr,New Comerstone Science Laboratory,Institute of Biomimetic Materials&Chemistry,Anhui Engineering Laboratory of Biomimetic Materials,Division of Nanomaterials&Chemistry,Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [2]Key Laboratory of Materials Physics,Anhui Key Laboratory of Nanomaterials and Nanotechnology,CAS Center for Excellence in Nanoscience,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031,China [3]Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China [4]School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China [5]Institute of Innovative Materials,Department of Materials Science and Engineering,Depatment of Chemistry,Southem University of Science and Technology,Shenzhen 518055,China

出　　处：《The Innovation》2023年第6期76-82,共7页创新（英文）

基　　金：Strategic Priority Research Program of the Chinese Acad-emy of Sciences(XDB 0470000);National Key Research and Development Program of China(2018YFE0202201 and 2021YFA0715700);National Natural Science Foundation of China(22305240 and 22293044);Y.F.M.acknowledges the funding suported by the Students'Innovation and Entrepreneurship Foundation of USTC(XY2022S02);Double First-Class University Construction Fund from USTC(YD2060002037);New Comerstone Science Foundation;This work was parially carried out at the USTC Center for Micro-and Nanoscale Research and Fabrication.This research used Beamline BL14B and BL15U of the Shanghai Synchrotron Radiation Fa cility(SSRF).

摘　　要：The renowned mechanical performance of biological ceramics can beattributed to their hierarchical structures,wherein structural features atthe nanoscale play a crucial role.However,nanoscale features,such asnanogradients,have rarely been incorporated in biomimetic ceramicsbecause of the challenges in simultaneously controlling the materialstructure at multiple length scales.Here,we report the fabrication of artificial nacre with graphene oxide nanogradients in its aragonite plateletsthrough a matrix-directed mineralization method.The gradients areformed via the spontaneous accumulation of graphene oxide nanosheetson the surface of the platelets during the mineralization process,whichthen induces a lateral residual stress field in the platelets.Nanoindentation tests and mercury intrusion porosimetry demonstrate that the material's energy dissipation is enhanced both intrinsically and extrinsicallythrough the compressive stress near the platelet surface.The energydissipation density reaches 0.159±0.007 nJ/μm^(3),and the toughnessamplification is superior to that of the most advanced cer amics.Numer-ical simulations also agree with the finding that the stress field not ablycontributes to the overall energy dissipation.This work demonstratesthat the energy dissipation of biomimetic ceramics can be furtherincreased by integrating design principles spanning multiple scales.This strategy can be readily extended to the combinations of other struc-tural models for the design and fabrication of structural ceramics withcustomized and optimized performance.

关 键 词：CERAMICS artificial ENERGY 

分 类 号：TB383[一般工业技术—材料科学与工程]