Carbon layer encapsulation strategy for designing multifunctional core-shell nanorod aerogels as high-temperature thermal superinsulators

Bionic Aerogel with a Lotus Leaf-like Structure for Efficient Oil-Water Separation and Electromagnetic Interference Shielding

“…As can be seen from the FT-IR patterns ( Figure 1 e), the Ars exhibit typical Al 2 O 3 absorption peaks [ 33 ], including the stretching vibration peaks of AlO-H (3099 and 3285 cm −1 ), the bending vibration peaks of AlO-H (1070 and 1162 cm −1 ) and the torsional vibration peaks of Al-O (650 and 760 cm −1 ). The absorption peaks at 1611, 1478 and 981 cm −1 are attributed to C=O, C-H and C-O, respectively, originating from organic solvents in RF sols and Al 2 O 3 nanorod sols [ 31 ]. In addition, benefiting from the abundant -OH (peaks at 3400 cm −1 ) on the surface of RF molecules and CNTs, intermolecular interactions with Ars can be established, allowing the carbon layer to grow uniformly on the hybridized backbone ( Figure 1 a).…”

“…The EMI effectiveness (SE) is the ability of a material to attenuate electromagnetic waves passing through it and is highly positively correlated with the electrical conductivity of materials [ 30 ]. In our previous work, core-shell nanorod aerogels with intrinsic superhydrophobicity were prepared [ 31 ]. However, the brittleness and unsatisfactory electrical conductivity of the core-shell aerogel are still the main obstacles for its use in oil-water separation and EMI shielding.…”

Ultralight elastic Al2O3nanorod-graphene aerogel for pressure sensing and thermal superinsulation

“…Ceramics are known to be intrinsically brittle and the previously reported Al 2 O 3 nanorod aerogels are also subject to structural collapse under large deformation. 15,16 However, the situation changes for ANGAs, where the rigid Al 2 O 3 nanorods exhibit excellent elasticity aer bonding with the graphene backbone and the mechanical properties of graphene are further enhanced by Al 2 O 3 nanorods. The compression process of ANGAs undergoes three typical stages, including the elastic deformation stage (less than 10% strain), the plateau stage (10-40% strain) and the densication stage (over than 40% strain).…”

“…40 At room temperature, l r can usually be neglected due to the small contribution, i.e., the thermal conductivity of the material can be simplied to the sum of l s and l g . 15 The density and room temperature thermal conductivity of GAs, ANAs, and ANGAs are shown in Fig. 5a and b.…”

“…13,14 Different from nanoparticle or nanober microstructures, the emerging nanorod aerogels stand out with its unique structure and excellent properties. 15 Nanorods with high aspect ratio not only can form a continuous microstructure instead of inefficient connections between particles, but also can introduce nanoscale pores that facilitate thermal insulation. So far, there are few reports on novel nanorod aerogels, and the only reports are focused on Al 2 O 3 nanorod aerogels (ANAs).…”