{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T21:39:56Z","timestamp":1790285996846,"version":"4.1.0"},"reference-count":39,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T00:00:00Z","timestamp":1773705600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T00:00:00Z","timestamp":1773705600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small Methods"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Miniaturization and rising power densities exacerbate localized hot spots on electrically insulating substrates, where heat spreads non\u2010selectively. A boron nitride nanotube (BNNT)\/epoxy \u201c\n                    <jats:italic>thermal guide<\/jats:italic>\n                    \u201d is developed for selective, geometry\u2010programmable heat routing. A viscosity\u2010tuned BNNT\/epoxy ink is processed by micro\u2010nozzle extrusion; confinement\u2010induced shear aligns BNNTs into an orientation\u2010defined architecture, as confirmed by small\u2010angle X\u2010ray scattering and supported by flow simulations identifying nozzle size as a key alignment control. Aligned bulk composites exhibit pronounced in\u2010plane anisotropy (\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>y<\/jats:sub>\n                    \/\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>x<\/jats:sub>\n                    \u2248 2.53; 2.96\u00a0vs 1.17\u00a0W m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    K\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    , parallel vs transverse to the fiber direction), and infrared thermography visualizes alignment\u2010guided heat transport: at 5\u00a0cm from a 70\u00b0C source, the y\u2010axis\u2010oriented specimen reaches 55.8\u00b0C after 30 s, compared with 48.1\u00b0C for the x\u2010axis\u2010oriented specimen. Dielectric integrity is retained at network\u2010forming loadings, with volume resistivity of \u223c10\n                    <jats:sup>13<\/jats:sup>\n                    \u03a9\u00b7m at 20 wt.% BNNT and low dielectric loss. Dispenser printing enables \u223c200\u00a0\u00b5m\u2010wide guides; contacting a 70\u00b0C source at the guide terminus produces &gt;20\u00b0C terminal contrast relative to the surrounding region outside the printed pattern. This method therefore enables electrically safe thermal routing to guide heat from a localized source to a target region while suppressing parasitic lateral diffusion into heat\u2010sensitive areas.\n                  <\/jats:p>","DOI":"10.1002\/smtd.202502424","type":"journal-article","created":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T14:36:03Z","timestamp":1773758163000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Geometry\u2010Programmable Heat Routing via Shear\u2010Aligned BNNT\/Epoxy Composites: From Passive Spreading to Directed Guiding"],"prefix":"10.1002","volume":"10","author":[{"given":"Jisu","family":"Park","sequence":"first","affiliation":[{"name":"Department of Materials Science and Chemical Engineering Hanyang University  Ansan Republic of Korea"},{"name":"BK21 FOUR ERICA\u2010ACE Center Hanyang University  Ansan Republic of 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