This work for the first time reports a freeze-casting route for fabricating an ultralight MXene aerogel (ρ < 10 mg cm−3) without using external supporters.
MXene is an emerging class of 2D materials exfoliated from ternary carbide and nitride ceramics. The exfoliation process, which is an acid etching approach, functionalizes the MXene surface with -OH, -O and -F groups. These functional groups offer significant opportunities for tuning the colloidal properties of the MXene nanoblocks; importantly, this tunability points the way towards a facile route for assembling these nanoblocks into 3D architectures that are in demand for many applications. This route, presented for the first time here, uses water/oil interfaces for assembling TiC-MXene in 3D architectures. It shows that cetyl trimethylammonium bromide (CTAB) can be used to tune the hydrophilic-hydrophobic balance of TiC-MXene via the interaction of positively charged -N(CH) and -O groups on the MXene surface. Crucially, it is found that this interaction can be controlled via the hydrogen ion concentration in the aqueous phase. Stable oil-in-water emulsions are the only product when the aqueous phase is neutral or basic. This understanding led us to fabricate a high internal phase Pickering emulsion with more than 70 vol% oil droplets and also a solid porous monolith based on this emulsion template.
MXenes are a class of two-dimensional transition metal carbides and nitrides with hydrophilic surface. This Communication, for the first time, reports a room temperature-initiated reaction between octadecyl isocyanate and MXene. This provides a facile and scalable route for introducing long alkane chains to the surface of MXene films. The hydrophobic coatings demonstrate strong ability for protecting MXene against degradation in the presence of moisture. 4 5 6 7 8 by a KRUSS GmbH goniometer. X-ray photoelectron spectroscopy (XPS) analysis was carried out on a Thermo ESCALAB 250XI spectrometer. The EMI shielding effectiveness of Ti 3 C 2 T x film was measured by an Agilent N5230 A vector network analyzer within 8. 2-12.4 GHz in a WR90 rectangular waveguide..
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