Achieving nanocomposites with simultaneous highly anisotropic thermal and electrical conductivities using carbon materials remains challenging as carbon material tends to form random networks in nanocomposites. Here, highly anisotropic and flexible graphene@naphthalenesulfonate (NS)/poly(vinyl alcohol) (GN/PVA) nanocomposites were fabricated using a layer-by-layer scraping method with flat graphene as the starting functional filler. NS acted as a bond bridge for linking the graphene (π−π interaction) and PVA (hydrogen bond). The results showed well-dispersed graphene in the nanocomposites while maintaining flat morphology with uniform in-plane orientation. The as-fabricated nanocomposites exhibited highly anisotropic thermal and electrical conductivities. The in-plane and out-of-plane thermal conductivities of the nanocomposite prepared with 10.0 wt % graphene reached 13.8 and 0.6 W m −1 K −1 , and in-plane and out-of-plane electrical conductivities were 10 −1 and 10 −10 S cm −1 , respectively. This indicated highly anisotropic thermal and electrical conductivities. Furthermore, the nanocomposites showed elevated flexibility and tensile strength from 42.0 MPa for pure PVA to 110.0 MPa for GN-5.0 wt %/PVA. In sum, the proposed strategy is effective for the preparation of nanocomposites with high flexibility, as well as superior anisotropic thermal and electrical conductivities.
A new class of superhydrophobic
surface based on multiple hybrid
coatings is proposed and prepared to improve mechanical and reproduction
stability. It does not only show a large water contact angle (ca.
174.5°) but also a slight decrease (ca. 6.4%) of water contact
angle after 100 mechanical abrasion cycles. Furthermore, the water
contact angle changes slightly (relative standard deviation, 0.14%)
for the three superhydrophobic surfaces prepared with the same procedure.
The application of superhydrophobic multiple hybrid coatings in corrosion
protection is further investigated by the Tafel polarization curves
and electrochemical impedance spectroscopy. The superhydrophobic multiple
hybrid coatings showed lower corrosion current (1.4 × 10–11 A/cm2), lower corrosion rate (ca. 1.6
× 10–7 mm/year), and larger polarization resistance
(7.9 × 104 MΩ cm2) in 3.5 wt % NaCl
aqueous solution compared to other superhydrophobic coatings reported
in previous works. This work not only confirms the formation of robust
superhydrophobic surface for real application in corrosion protection
but also provides a new model of superhydrophobic surface based on
multiple hybrid coatings with high mechanical, chemical, and reproduction
stability for various applications.
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