Kai Yang,Pengxiang Zhang,Zhenzhen Feng,Yunfan Wang,Jian Peng,Bao-Wen Li
2D materials have exhibited great potential for applications in anticorrosion nanocoatings. However, the nanocoating of prefocused graphene shows “corrosion-promoting activity” due to its high conductivity. Metal oxide nanosheets obtained by delaminating layered oxides have been another attractive candidate. This study demonstrates a water-based Ca 2 Nb 3 O 10 (CNO) ink spray coated on magnesium alloys to form a continuous coating without complex functionalization and structural control. The composite coating of Ca 2 Nb 3 O 10 (CNO) and polydopamine (PDA) is fabricated by combining spray- and dip-coating methods. The surface composition and microstructure of the as-prepared coatings are characterized by X-ray diffractometry, Fourier transform infrared, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy-dispersive spectrometry. The anticorrosion performance of the composite coating is evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy, and salt spray tests. The electrochemical results show that the CNO/PDA heterostructure coating provides an enhanced corrosion inhibition efficiency (99.62%) with a corrosion current density of 5.49 × 10 −7 A cm −2 , three orders of magnitude lower than bare AZ31. The immersion tests before and after heat treatment and salt spray tests indicate that the composite coating has good stability and long-term anticorrosion performance. Solution-processed nanocoating and extensible materials design provide a green and facile route to anticorrosion nanotechnology for industrial demands.
Xinzhou Wu,Fei Fei,Zheng Chen,Wenming Su,Zheng Cui
A new nanocomposite dielectric ink has been developed by dispersing Ca 2 Nb 3 O 10 nanosheets in acetone diluted PMMA solution. Dielectric films were formed by printing the ink with an aerosol jet printer. SEM images showed that the 2D nanosheets were homogeneously distributed in the printed films which exhibited higher dielectric constants than PMMA, low dielectric loss and good dielectric stability over a wide range of frequencies. The effect of nanosheet content in the ink has been investigated. Thin-film transistors based on indium gallium zinc oxide semiconductor material were fabricated with the printed nanocomposite insulator. The feasibility of printing dielectrics based on the new nanocomposite ink for thin-film transistors has been demonstrated.
Si Fu,Binbin Zhang,Zhiying Miao,Zhenyang Li,Rong Tu,Song Zhang,Bao-Wen Li
Chemically exfoliated nanosheets have been extensively employed as functional nanofillers for the fabrication of polymer nanocomposites due to their remarkable electrical, magnetic and optical properties. However, achieving a good dispersion of charged nanosheets in polymer matrix, which will determine the performance of polymer nanocomposites, remains a challenge. Herein, we investigated the dispersion and aggregation behavior of negatively charged Ca2Nb3O10(CNO) perovskite nanosheets in negatively charged sodium alginate (SA) aqueous dispersion using dynamic light scattering (DLS). When CNO nanosheets meet with SA, aggregation and coagulation inevitably occurred owing to the absorption of SA on nanosheets. By controlling the electrostatic attraction between positively charged poly(ethylene imine) (PEI) and negatively charged SA, the charge density and hydrodynamic size of SA can be tuned to enable the good dispersion of CNO nanosheets in SA. This result may provide a new strategy to achieve the good dispersion of charged nanosheets in charged polymers for the rational design of multifunctional nanocomposites.Keywords:perovskite nanosheets;dispersion;charged polymer;aggregation of nanosheets;dynamic light scattering
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