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We show that when nanoscale Cu, Ag, and Al crystals are confined between two plates and subjected to axial temperature gradients approaching 10\n                    <jats:sup>8<\/jats:sup>\n                    K m\n                    <jats:sup>\u22121<\/jats:sup>\n                    , they sustain a persistent, convection\u2010like bidirectional mass flow. Thermo\u2010mechanical\u2010induced surface migration transports atoms from the hot end to the cold end, where interfacial insertion generates a self\u2010regulated compressive back stress of up to 10\n                    <jats:sup>2<\/jats:sup>\n                    \u00a0MPa\u2014sufficient to push the crystalline core in the reverse direction. This closed\u2010loop transport, coupling directional surface diffusion with rigid\u2010body motion, is supported by molecular dynamics simulations and theoretical analysis. The findings reveal a previously unrecognized regime of mass\u2010stress coupling in solids, opening new routes for solid\u2010based thermal actuation and informing the thermal\u2010mechanical reliability of nanoscale devices.\n                  <\/jats:p>","DOI":"10.1002\/smll.202512375","type":"journal-article","created":{"date-parts":[[2026,5,25]],"date-time":"2026-05-25T14:53:58Z","timestamp":1779720838000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Interfacial Plating Driving Convection\u2010Like Motion of a Sandwiched Nanocrystal"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6772-5776","authenticated-orcid":false,"given":"Yueqing","family":"Yang","sequence":"first","affiliation":[{"name":"Center for Advancing Materials Performance from the Nanoscale (CAMP\u2010Nano) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University  Xi'an P. R. China"},{"name":"State Grid Shandong Electric Power Research Institute  Jinan P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-2082-226X","authenticated-orcid":false,"given":"Degang","family":"Xie","sequence":"additional","affiliation":[{"name":"Center for Advancing Materials Performance from the Nanoscale (CAMP\u2010Nano) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University  Xi'an P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Suyang","family":"Sun","sequence":"additional","affiliation":[{"name":"Center for Alloy Innovation and Design (CAID) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University  Xi'an P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Zhang","sequence":"additional","affiliation":[{"name":"Center for Alloy Innovation and Design (CAID) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University  Xi'an P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingzhao","family":"Chen","sequence":"additional","affiliation":[{"name":"Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University  Qinhuangdao P. R. 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