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Sequential Dual Alignments Introduce Synergistic Effect on Hexagonal Boron Nitride Platelets for Superior Thermal Performance.
Chen, Yunxia; Gao, Zhiming; Hoo, Simon A; Tipnis, Varun; Wang, Renjing; Mitevski, Ivan; Hitchcock, Dale; Simmons, Kevin L; Sun, Ya-Ping; Sarntinoranont, Malisa; Huang, Yong.
Afiliación
  • Chen Y; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA.
  • Gao Z; Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN, 37830, USA.
  • Hoo SA; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA.
  • Tipnis V; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA.
  • Wang R; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA.
  • Mitevski I; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA.
  • Hitchcock D; Savannah River National Laboratory, Savannah River Site, Aiken, SC, 29808, USA.
  • Simmons KL; Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99354, USA.
  • Sun YP; Department of Chemistry, Clemson University, Clemson, SC, 29634, USA.
  • Sarntinoranont M; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA.
  • Huang Y; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA.
Adv Mater ; 36(25): e2314097, 2024 Jun.
Article en En | MEDLINE | ID: mdl-38466829
ABSTRACT
Planarly aligning 2D platelets is challenging due to their additional orientational freedom compared to 1D materials. This study reports a sequential dual-alignment approach, employing an extrusion-printing-induced shear force and rotating-magnetic-field-induced force couple for platelet planarly alignment in a yield-stress support bath. It is hypothesized that the partial alignment induced by a directional shear force facilitates subsequent axial rotation of the platelets for planar alignment under an external force couple, resulting in a synergistic alignment effect. This sequential dual-alignment approach achieves better planar alignment of 2D modified hexagonal boron nitride (mhBN). Specifically, the thermal conductivity of the 40 wt% mhBN/epoxy composite is significantly higher (692%) than that of unaligned composites, surpassing the cumulative effect of individual methods (only 133%) with a 5 times more synergistic effect. For 30, 40, and 50 wt% mhBN composites, the thermal conductivity values (5.9, 9.5, and 13.8 W m-1 K-1) show considerable improvement compared to the previously reported highest values (5.3, 6.6, and 8.6 W m-1 K-1). Additionally, a 3D mhBN/epoxy heat sink is printed and evaluated to demonstrate the feasibility of device fabrication. The approach enables the planar alignment of electrically or thermally conducting 2D fillers during 3D fabrication.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Alemania