Boron nitride whiskers and nano alumina synergistically enhancing the vertical thermal conductivity of epoxy-cellulose aerogel nanocomposites

Abstract

With the continuous innovation of electronic information technology, thermal interface materials, which mainly play the role of heat dissipation in microelectronic devices, will face great challenges. In this work, the boron nitride whiskers (BNWK)@Al 2 O 3 /cellulose aerogels (CA) obtained by electrostatic self-assembly one-dimensional BNWK and zero-dimensional nano-Al 2 O 3 combined with directional freezing of CA. The obtained BNWK@Al 2 O 3 /CA not only has a unique vertical network structure, but also exhibits exceptional compressive mechanical strength, especially when the mass ratio of BNWK/nano-Al 2 O 3 is 1:7, the compressive strength of BNWK@Al 2 O 3 (1:7)/CA reaches 97 kPa, based on the exibility of the CA and the support of the rigid hybrid ller BNWK@Al 2 O 3 , the theoretical relaxation time of the composite is also as high as 25327 s. Furthermore, the thermal conductivity of the epoxy-based composite (BNWK@Al 2 O 3 /CA/EP) with a ller loading of 8.6 wt% is about 1.92 W/(m•K), which is 9.6 times that of pure EP, the excellent thermally conductive property is due to the accelerated phonon transport by the vertically arranged BNWK@Al 2 O 3 network structure. Hence, this work provides a new idea for developing a new generation of thermal interface materials.

Degradation evolution and mechanism of sheet molding compound with variable composition exposed to acid solution environment

“…A study demonstrated that the corrosion rate of glass ber/vinyl ester resin in 40 wt% H 2 SO 4 solution increased with immersion time and temperature [11]. Research indicated that the uorine-and boron-free glass bers can signi cantly enhance the acid resistance of composites [12]. A study identi ed that a particular high performance and general glass bers reinforced composites shows almost the same deterioration of mechanical properties under hot and humid conditions, while the high-performance ber reinforced composites showed a better corrosion resistance under acid and salt spray conditions [13].…”

MXene@c-MWCNT Adhesive Silica Nanofiber Membranes Enhancing Electromagnetic Interference Shielding and Thermal Insulation Performance in Extreme Environments

“…For most phase change insulation materials, maintaining long-lasting insulation performance requires a large space volume due to fixed enthalpy values. Ceramic aerogel materials have low thermal conductivity and slow phonon transfer rate; especially for silica (SiO 2 ) aerogel, it has small pore size, high porosity and thermal stability, so it is a lightweight and efficient thermal insulation material [8,9]. However, in practical applications, researchers found that SiO 2 aerogel is highly transparent to infrared radiation and has great brittleness [10].…”