Fe₃O₄ Nanoparticle-Decorated Graphene Oxide Nanosheets for Magnetic Assembly of Artificial Nacre

Abstract

Natural nacre, often referred as nature’s armor, has a typical “brick-and-mortar” hierarchical micro-/nanoscale multilayer microstructure and remarkable tensile strength and toughness. The highly ordered multilayer microstructure of nacre provides valuable insights into constructing advanced nanocomposites. Although significant success has been achieved in simulating artificial nacre-mimetic materials on a laboratory scale, it is still difficult to apply on a large scale because of time-consuming sequential depositions. In this study, a rapid and large-scalable magnetic assembly process for the fabrication of the graphene oxide (GO)-based composite film that mimics the structure of nacre was reported. Magnetic GO nanosheets were synthesized by decorating Fe3O4 nanoparticles on the surface of GO nanosheets and then assembled with poly­(vinyl alcohol) (PVA) solution to form nacre-mimetic nanocomposites via the magnetic assembly technique. The tensile strength and toughness of the MGO–PVA film can reach 248.0 ± 6.7 MPa and 7.0 ± 0.5 MJ·m–3, which are 5.0 and 4.0 times higher than the pure MGO film, respectively. More interestingly, after in situ reduction by hydroiodic acid, the tensile strength reached as high as 340.0 ± 6.2 MPa. This work offers a rapid process of fabricating strong integration nacre-inspired materials, which shows applications in engineering, aerospace, flexible energy devices, and electromagnetic interference shielding materials.

A Self‐Assemble Supramolecular Film with Humidity Visualization Enabled by Clusteroluminescence

“…This process is similar to the preparation of nacre‐like composites with typical brick‐and‐mortar architecture. [ 14 ] The equilibrium states of the dynamic self‐assembly process strongly depend on concentration, which can organize the building blocks and induce the subsequent polymerization. Meanwhile, PMV also showed intriguing CL after the ring‐opening of the anhydride group in NaOH aqueous solution.…”

Graphene Oxide-Modified MXenes with Ti–O–C Covalent Bonding for Carbon Fiber Composites with Enhanced Interfacial Properties and Toughness

“…This highly ordered and compact structure provided effective stress transport and redistribution through crack deflection and passivation. The long–chain AD molecules acting as the mortar phase effectively crosslinked the adjacent GO, GO, and CF surfaces through π–π interactions, ensuring efficient brick phase slip …”

“…The long−chain AD molecules acting as the mortar phase effectively crosslinked the adjacent GO, GO, and CF surfaces through π−π interactions, ensuring efficient brick phase slip. 41 Figure 7 depicts the fracture morphologies observed after ILSS tests to investigate the fracture morphologies between the CFs and the matrix and the failure mechanism of CFRP. As shown in Figure 7a, the CF exhibits a smooth surface with a considerably small amount of residual resin, indicating poor interfacial adhesion between the CF and matrix, resulting in interfacial failure.…”

Sprayed Nanometer-Thick Hard-Magnetic Coatings with Strong Perpendicular Anisotropy for Data Storage Applications

“…Despite being the cheapest mass-market solution for years, the magnetic coating technology still requires further progress in optimizing the production pathways while retaining the high quality of the resulting medium. − To date, most of the efforts in technological improvement concern physical vapor deposition (PVD) of textured hexaferrite phases. ,, However, with PVD, crystal growth kinetics are limited by the deposition rate and post-treatment duration, slowing the tape spooling conveyor during processing. Sputter deposition provides in-plane texturing in the absence of any crystallographic relation of newly formed phases to the underlying substrates. , It diminishes an effective coercive force of the magnetic layer and results in spontaneous remagnetization of the adjacent grains …”