Ultra-Robust Thermoconductive Films Made from Aramid Nanofiber and Boron Nitride Nanosheet for Thermal Management Application

Abstract

The development of highly thermally conductive composites with excellent electrical insulation has attracted extensive attention, which is of great significance to solve the increasingly severe heat concentration issue of electronic equipment. Herein, we report a new strategy to prepare boron nitride nanosheets (BNNSs) via an ion-assisted liquid-phase exfoliation method. Then, silver nanoparticle (AgNP) modified BNNS (BNNS@Ag) was obtained by in situ reduction properties. The exfoliation yield of BNNS was approximately 50% via the ion-assisted liquid-phase exfoliation method. Subsequently, aramid nanofiber (ANF)/BNNS@Ag composites were prepared by vacuum filtration. Owing to the “brick-and-mortar” structure formed inside the composite and the adhesion of AgNP, the interfacial thermal resistance was effectively reduced. Therefore, the in-plane thermal conductivity of ANF/BNNS@Ag composites was as high as 11.51 W m−1 K−1, which was 233.27% higher than that of pure ANF (3.45 W m−1 K−1). The addition of BNNS@Ag maintained tensile properties (tensile strength of 129.14 MPa). Moreover, the ANF/BNNS@Ag films also had good dielectric properties and the dielectric constant was below 2.5 (103 Hz). Hence, the ANF/BNNS@Ag composite shows excellent thermal management performance, and the electrical insulation and mechanical properties of the matrix are retained, indicating its potential application prospects in high pressure and high temperature application environments.

Recycled and flexible boron nitride heat spread film with high thermal conductivity

“…In Fig. 3f, a comparison of the in-plane thermal conductivity of the composites with different BN filler contents is presented, 5,24,40–48 highlighting the excellent thermal conductivity performance achieved in this study. According to Fig.…”

Bioinspired Dielectric Film with Superior Mechanical Properties and Ultrahigh Electric Breakdown Strength Made from Aramid Nanofibers and Alumina Nanoplates

“…Consequently, the original Kevlar fiber with a diameter of ~15 μm ( Figure 1 b) was dissociating into curly nanofibers with length in micrometer scale and diameter in the range of 20–30 nm, as revealed in the TEM image in Figure 1 c. Kotov et al found that the ANFs not only inherit the exceptional properties of Kevlar fiber, but also possess a large number of functional groups on their surface [ 17 ]. The nanoscale, high aspect ratio, surface activity, and good dispersibility of ANFs render them promising nanoscale building blocks to prepare advanced materials [ 1 , 22 , 23 , 28 ]. The Al 2 O 3 nanoplates, with a lateral size of approximately 1 μm and mean thickness of 100 nm ( Figure 1 d), were utilized to enhance the performance of ANFs based films, owing to their excellent dielectric properties [ 29 , 30 ].…”

Bio-Inspired Aramid Fibers@silica Binary Synergistic Aerogels with High Thermal Insulation and Fire-Retardant Performance

“…Due to the physical entanglement and strong hydrogen bond interaction between nanofibers, ANFs have excellent mechanical strength and toughness [ 27 ]. ANFs began to be used to prepare multifunctional hybrid materials, including supercapacitors [ 28 , 29 , 30 ], sensors [ 31 , 32 ], thermal managers [ 8 , 18 , 33 , 34 ], infrared stealth materials [ 20 , 35 ], insulation materials [ 36 , 37 ], and electromagnetic interference shielding materials [ 38 ]. It is worth noting that aramid fiber, as one of the most heat-resistant organic materials, is widely used in heat insulation materials and engineering materials [ 19 , 39 ], but is easily ignitable in the absence of fire barriers [ 6 , 35 , 40 ].…”