Nacre‐Inspired Bacterial Cellulose/Mica Nanopaper with Excellent Mechanical and Electrical Insulating Properties by Biosynthesis

Abstract

The exploration of extreme environments has become necessary for understanding and changing nature. However, the development of functional materials suitable for extreme conditions is still insufficient. Herein, a kind of nacre‐inspired bacterial cellulose (BC)/synthetic mica (S‐Mica) nanopaper with excellent mechanical and electrical insulating properties that has excellent tolerance to extreme conditions is reported. Benefited from the nacre‐inspired structure and the 3D network of BC, the nanopaper exhibits excellent mechanical properties, including high tensile strength (375 MPa), outstanding foldability, and bending fatigue resistance. In addition, S‐Mica arranged in layers endows the nanopaper with remarkable dielectric strength (145.7 kV mm−1) and ultralong corona resistance life. Moreover, the nanopaper is highly resistant to alternating high and low temperatures, UV light, and atomic oxygen, making it an ideal candidate for extreme environment‐resistant materials.

Thin lamellar films with enhanced mechanical properties for durable radiative cooling

“…11g ). With increasing strain, Mica@TiO 2 that spans the whole major crack to withstand more stress 34 , 35 and branched cracks that bridged at the tip for toughening have also been observed (Supplementary Fig. 11h–j ).…”

“…Furthermore, through the complete reprotonation in water, the robust highly ordered lamellar microstructure is achieved with the strong electrostatic interaction and multiple hydrogen bonding between microfibers, demonstrating a tensile strength of ~193.2 MPa, a Young’s modulus of 4.9 GPa and a toughness of 16.2 MJ/m 3 , which are far superior to the previously reported PDRC films. Nevertheless, excessive Mica@TiO 2 will produce undesirable ultra micropore defects 34 , leading to an obvious degradation in the mechanical properties of composites. Despite that, the strength of AMTA over 100 MPa has apparently satisfied the practical applications of efficient PDRC.…”

“…Based on the results of previous exploration (Supplementary Fig. 9 ) and relevant literature standards 34 , 43 , 44 (ASTM D882, etc. ), appropriate testing conditions were selected to comprehensively and accurately reflect the mechanical properties of PDRC films.…”

In Situ Fermentation of an Ultra-Strong, Microplastic-Free, and Biodegradable Multilayer Bacterial Cellulose Film for Food Packaging

“…Second, the addition of QMs limits the bundling of the newly generated nanofibers into ribbons, resulting in a finer cellulose nanofiber compared to the pure BC film (Figure S9), which helped to improve the toughness of the multilayer film but diminished its tear strength (Figure S10). − Third, the in situ fermentation strategy creates a continuous structure that improves the mechanical properties of the multilayer film by preventing the ruptures between the functional layers. , Owing to its 3-D nanoscale network and continuous structure, the BC/GG/QM multilayer film achieves outstanding mechanical properties in contrast to other reported cellulose films (Figure c and Table S2).…”

Highly Thermally Conductive and Structurally Ultra-Stable Graphitic Films with Seamless Heterointerfaces for Extreme Thermal Management

“…These challenges are particularly apparent in complex operating conditions, such as militaries [ 4 ], spacecrafts [ 5 ], supercomputers [ 6 ], nuclear reactors [ 7 – 9 ], and other complex scenarios. Some common environmental factors in these extreme application scenarios like temperature variations [ 10 , 11 ], ultraviolet irradiation [ 12 ], atomic oxygen [ 12 ], and liquid nitrogen [ 13 – 15 ] can significantly impact the stability of devices, setting new requirements for thermal management materials.…”