Synthesis of Superhydrophobic Barium Hexaferrite Coatings with Low Magnetic Hardness

Abstract

Using the multifunctional material barium hexaferrite as an example, the prospects for treatment at a quasi-equilibrium low temperature in an open atmosphere to form superhydrophobic magnetic coatings with pronounced crystalline and magnetic anisotropy have been demonstrated for the first time. The relationship between plasma treatment conditions, structural-phase composition, morphology, and superhydrophobic properties of (0001) films of barium hexaferrite BaFe12O19 on C-sapphire is studied. X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), as well as magnetometry and moisture resistance analysis, were used as research methods. During plasma treatment with a mass-average temperature of 8–10 kK, intense evaporation and surface melting were observed, and texturing of the deposit along (0001) is found. When the treatment temperature was reduced to 4–5 kK, the evaporation of the material was minimized and magnetic and crystal anisotropy increased. However, the increase in the size of crystallites was accompanied by the transition of oxygen atoms from lattice nodes to interstitial positions. All samples exhibited low coercive fields below 500 Oe, associated with the frustration of the magnetic subsystem. Features of growth of materials with a wurtzite structure were used to form a superhydrophobic coating of barium hexaferrite. Plasma treatment regimes for obtaining self-cleaning coatings are proposed. The use of magnetically hard barium hexaferrite to radically change the properties of a coating is demonstrated herein as an example.

Comparative study between oxide/soft ferrite, oxide/hard ferrite, and soft/hard ferrite nanocomposites: structural, electrical, and magnetic properties

“…To identify the elements found in both pure samples and nanocomposites and their oxidation states, XPS measurements are employed. Figure 6 Every survey spectrum from the previous pure samples matches the prior studies [88][89][90]. The existence of peaks in the C2 survey spectrum that correspond to nickel, oxygen, barium, and iron, along with the absence of peaks for zinc, indicates the formation of the C2 nanocomposite and validates the results of the XRD technique.…”

Removal of Hexamethyldisiloxane via a Novel Hydrophobic (3–Aminopropyl)Trimethoxysilane-Modified Activated Porous Carbon

“…In order to solve this problem, researchers normally employ oxidation treatment, acid–base surface modification, and hydrophobic coating in an attempt to improve the surface hydrophobicity of APC [ 32 ]. The former two methods are usually deemed to be laborious with limited enhancement in the hydrophobization of APC [ 33 ]. Low surface-energy materials have been used for surface grafting, e.g., silane solutions, Teflon, and other moisture-repellent polymeric materials, to enhance the surface hydrophobicity [ 33 ].…”

“…The former two methods are usually deemed to be laborious with limited enhancement in the hydrophobization of APC [ 33 ]. Low surface-energy materials have been used for surface grafting, e.g., silane solutions, Teflon, and other moisture-repellent polymeric materials, to enhance the surface hydrophobicity [ 33 ]. Liu et al synthesized a series of hydrophobic-modified (polydimethylsiloxane (PDMS) coating)-activated carbons (AC) by depositing PDMS on AC using a thermal evaporation method [ 32 ].…”

Influence of Plasma Treatment Parameters on the Structural-Phase Composition, Hardness, Moisture-Resistance, and Raman-Enhancement Properties of Nitrogen-Containing Titanium Dioxide

“…Plasma treatment, as one of the methods of surface modification, is the most used today [ 1 , 2 , 3 , 4 , 5 , 6 ]. The advantage is the ability to process objects of complex shapes.…”