Hydrophobic BN Powders by Combustion Synthesis and Its Super-hydrophobic Coatings: Preparation and Property

doi:10.15541/jim20220221

Abstract

Abstract:

BN nanofilms with hierarchical structure exhibite super-hydrophobicity, but they are not suitable for the large-scale production and application due to their complicated preparation process and expensive cost. Compared with common BN nanofilms, the application of super-hydrophobic coatings based on hydrophobic BN powders are more convenient. Herein, the hydrophobic single-phase BN powders were prepared by combustion synthesis method through magnesiothermic reduction reaction and acid washing, showing the water contact angle at (144.6±2.4)°. Their hydrophobic character lies in the micro-nano hierarchical structure of BN particles. The super-hydrophobic BN/fluorosilicone resin coatings were prepared using the combustion-synthesized hydrophobic BN powders as fillers. The water contact angle and sliding angle for 30% BN/fluorosilicone resin coatings (in mass) are (151.2±0.7)° and 8°, respectively, which are comparable to that of BN nanofilms fabricated by CVD method reported in the literature. This method is a convenient way to prepare super-hydrophobic organic-inorganic composite coatings by utilizing the hydrophobicity of ceramic powders. Therefore, hydrophobic BN powders and super-hydrophobic BN/fluorosilicone resin coatings are expected to have wide application.

Key words: combustion synthesis, BN, hydrophobicity, super-hydrophobic coating

CLC Number:

TB34

MENG Qing, LI Jiangtao. Hydrophobic BN Powders by Combustion Synthesis and Its Super-hydrophobic Coatings: Preparation and Property[J]. Journal of Inorganic Materials, 2022, 37(10): 1037-1042.

Figures/Tables 4

Fig. 1 XRD patterns of combustion synthesized powders before (a) and after (b) acid washing

Fig. 2 Characterization of MgO-BN powders and BN powders (a) SEM image, (b) TEM image and (c) EDS element mappings of MgO-BN powders; (d) SEM image, (e) TEM image (inset is SAED pattern of B region), and (g) HRTEM image of A region in Fig.(e) of BN powders

Fig. 3 (a) Photo and (b) contact angle of water droplet on the surface of BN powders, photos of (c) BN powders floated on water without any submersion and (d) a large number of bubbles attached to the surface of BN powders adhering to the glass slide

Fig. 4 (a) Relationship between water contact angle of BN/FSi coating surface and BN solid content, (b) SEM image of 30% BN/FSi resin coating surface (yellow arrows pointing the upright BN nanosheets), (c) sliding angle of 10 μL water droplet on 30% BN/FSi resin coating surface, and (d) self-cleaning effect of 30% BN/FSi coating

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