Ultrathin Cellulose Nanofiber Assisted Ambient‐Pressure‐Dried, Ultralight, Mechanically Robust, Multifunctional MXene Aerogels

Abstract

Ambient‐pressure‐dried (APD) preparation of transition metal carbide/nitrides (MXene) aerogels is highly desirable yet remains highly challenging. Here, ultrathin, high‐strength‐to‐weight‐ratio, renewable cellulose nanofibers (CNFs) are efficiently utilized to assist in the APD preparation of ultralight yet robust, highly conductive, large‐area MXene‐based aerogels via a facile, energy‐efficient, eco‐friendly, and scalable freezing‐exchanging‐drying approach. The strong interactions of large‐aspect‐ratio CNF and MXene as well as the biomimetic nacre‐like microstructure induce high mechanical strength and stability to avoid the structure collapse of aerogels in the APD process. Abundant functional groups of CNFs facilitate the chemical crosslinking of MXene‐based aerogels, significantly improving the hydrophobicity, water resistance, and even oxidation stability. The ultrathin, 1D nature of the CNF renders the minimal MXenes’ interlayered gaps and numerous heterogeneous interfaces, yielding the excellent conductivity and electromagnetic interference (EMI) shielding performance of aerogels. The synergies of the MXene, CNF, and abundant pores efficiently improve the EMI shielding performance, photothermal conversion, and absorption of viscous crude oil. This work shows great promises of the APD, multifunctional MXene‐based aerogels in electromagnetic protection or compatibility, thermal therapy, and oil‐water separation applications.

Flexible, Stretchable, and Transparent MXene Nanosheet/Thermoplastic Polyurethane Films for Multifunctional Heating and Electromagnetic Interference Shielding

“…Notably, MXene nanosheets with excellent localized surface plasmon resonance effects can effectively convert light into heat energy, which provides the possibility of a dual-energy-driven heater that does not rely on electricity. ,− UV–vis–NIR spectroscopic analysis was used to analyze the light absorption capacities of MXene/TPU films. ,, As shown in Figure a, the light absorption of pure TPU films was almost close to zero. The introduction of MXene can effectively improve the light absorption of MXene/TPU films in the UV–vis–NIR region, and the absorption ability increased with the increasing content of MXene.…”

Nature‐Inspired Interconnected Macro/Meso/Micro‐Porous MXene Electrode

“…In addition, the doping of CNF will provide abundant active sites for the reaction with hydrazine, resulting in large pore volume and high porosity. The rich functional groups in CNF promote the chemical cross-linking of the composite foam, which can effectively avoid the structural collapse of PM due to the action of hydrazine during the foaming process [36] (Figure S13, Supporting Information). As a result, after gas foaming, the PM/CNF film swelled rapidly and the layers expanded at least 20 times, forming the macroporous structure and achieving a transition from dense stacking to a hierarchically interconnected porous structure across three scales (Figure 2k; Figure S12, Supporting Information).…”

Specific capture of Pseudomonas aeruginosa for rapid detection of antimicrobial resistance in urinary tract infections

“…TEM analysis was executed through the utilization of a JEOL TEM equipped with an in-column Omega-type energy filter (JEM-2200FS, Joel, Japan) (Wu et al, 2021(Wu et al, , 2022a(Wu et al, , 2022bPan et al, 2016Pan et al, , 2017Pan et al, , 2022aGuo et al, 2022). 5 μL of the sample after a 100-fold dilution was added to a TEM grid (Kung et al, 2018(Kung et al, , 2020Tseng et al, 2020) (Carbon Film Supported Copper Grid, 200 Meshes, Electron Microscopy Sciences, USA) till the solvent was completely evaporated (Yang et al, 2022;Pan et al, 2022b;Yu et al, 2021;Kung et al, 2021).…”