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High Water‐Absorbent and Phase‐Change Heat Dissipation Materials Based on Super‐Aligned Cross‐Stack CNT Films
Author(s) -
Yu Wei,
Liu Changhong,
Fan Shoushan
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201801216
Subject(s) - materials science , thermal conductivity , evaporation , composite material , stack (abstract data type) , absorption (acoustics) , dissipation , carbon nanotube , power density , thermodynamics , power (physics) , physics , computer science , programming language
Carbon nanotubes (CNTs) with the advantage of high thermal conductivity and light weight can be widely used in thermal management. Meanwhile, heat removal for hot spots has become a major issue in the development of electronics because of the increasing of power density and thermal load. Therefore, more effective heat dissipation approaches are needed. Here, the high water‐absorbent and phase‐change heat dissipation materials based on super‐aligned cross‐stack CNT (CSCNT) films with excellent cooling performance are reported. Pure CSCNT and CaCl 2 /CSCNT composite show the outstanding water absorption property because of their high specific surface area and porosity. Combined the high natural convection and heat radiation of CSCNTs with heat removal by water evaporation, the heat dissipation coefficient of CaCl 2 /CSCNT can reach as high as 98 W m −2 K −1 with the help of auxiliary plate. Due to the high absorption rate, the composite can absorb water when electronics are at low power and dissipate heat by water evaporation at high power. Moreover, it is founded that there is a dynamic balance of water absorption and desorption to enhance cooling performance at thermal equilibrium.