Biomimetic Nacreous Composite Films toward Multipurpose Application Structured by Aramid Nanofibers and Edge-Hydroxylated Boron Nitride Nanosheets

Abstract

High-performance dielectric film is one of the most promising materials for comprehensive applications ranging from high-voltage electrical equipment to high-power electronic devices. We here report the fabrication of biomimetic nacreous multifunctional composite films by self-assembling nanoscale building blocks of one-dimensional (1D) aramid nanofibers (ANFs) and two-dimensional (2D) edge-hydroxylated boron nitride nanosheets (BNNS-OH). Synchronously, poly(vinyl alcohol) was introduced as soft glue to improve the interfacial interaction between ANFs and BNNS-OH by building a three-dimensional (3D) hydrogen-bond network. Attributing to the well-designed nanostructure and favorable interfacial hydrogen bonding, the resultant composite films exhibited a ultrastrong tensile strength (∼329.6 MPa), a high thermal conductivity (16.03 W m −1 K −1 ), outstanding dielectric properties, superior thermostability, and long life. Moreover, these synergistic properties of composite films were tunable by changing the contents of BNNS-OH to accommodate the requirements of multipurpose applications in the development of advanced insulation systems and thermal management materials.

Multipurpose Poly(dimethylsiloxane) Dielectric Films with Superb Thermal Conductivity by Incorporating Silver Nanoparticle-Decorated Boron Nitride Nanosheets

“…The growth of electrical branches inside the composite film is required to circumvent the BNNS. The higher loading capacity of the film offered a longer and more tortuous path for the propagation of electric branches . The E 0 values of the BNNS@Ag/PDMS composite films increased with the amount of BNNS@Ag ranging from 5 to 20 wt %.…”

“…The higher loading capacity of the film offered a longer and more tortuous path for the propagation of electric branches. 62 The E 0 values of the BNNS@Ag/PDMS composite films increased with the amount of BNNS@Ag ranging from 5 to 20 wt %. A maximum E b was obtained at 20 wt % (130.61 kV/mm), an increment of 15.1% over the E 0 of the pure PDMS film (113.52 kV/mm).…”

Numerical Simulation on the Optimization of the Anisotropic Thermal Conductivity of Hexagonal Boron Nitride/Nanofiber Composite Films

“…High-performance heat dissipation has become a substantive need for developing the miniaturization and densification of electronic devices to solve “hot spot” problems because the generated heat accumulation poses a threat to the function and reliability of electronic components. − To quickly remove excess heat from the confined space of electronic devices, it is highly required to enhance the heat dissipation along a specific direction. − …”

Significantly Suppressed Dielectric Loss and Enhanced Breakdown Strength in Core@Shell Structured Ni@TiO2/PVDF Composites

“…One is dispersing high–ε r inorganic fillers into an insulating polymer [ 18 ], such as Pb(Zr 1−x Ti x )O 3 (PZT), BaSrTiO 3 , and others. Generally speaking, a decent increase in ε r can be observed in the composites only when the filler concentration is nearly close to 65 wt% [ 19 , 20 , 21 , 22 ], which will inevitably destroy the processing [ 23 , 24 , 25 , 26 , 27 , 28 ], optical and mechanical performances of the composites [ 29 ]. Another approach to solve this question is based on percolating composites by using the conductive particles, such as copper (Cu) [ 23 ], zinc (Zn) [ 24 ], iron (Fe) [ 25 ], silver (Ag) [ 26 ] and carbon materials such as nanotubes (CNTs) [ 27 ].…”