Highly oriented laminated dihydroxy composite metal oxide film and its preparing method

Abstract

A high orientation layered dihydroxy compound metal oxide (LDHs) film and biomimetic synthesis method. Said film is grown on high molecular base material, whose lattice plane (00I) (or ab plane) being normal to surface of base unit with high orientation, compact and film thickness of 0.5-5 micrometer. Said method contains horizontal suspension setting the molecular base unit with surface sulfonation film base unit in solution containing urea and relative metal salt, controlling anion releasing by controlling ureolysis speed through controlling reaction temperature and time.

Description

technical field [0001] The invention relates to a highly oriented layered double hydroxyl compound metal oxide film and a preparation method thereof, in particular to a biomimetic synthesis method of a layered double hydroxyl compound metal oxide film grown on a surface sulfonated polymer material substrate. Background technique [0002] Oriented calcium carbonate films, goethite (α-FeOOH) films and titanium dioxide films have been successfully synthesized on surface sulfonated polystyrene substrates (Science, 1994, 264:48). Due to the similarity to the biomineralization of inorganic substances in living organisms, the method is called biomimetic synthesis. [0003] Layered double hydroxyl complex metal oxides, also called hydrotalcite-like (LDHs), are an important class of inorganic functional materials. Because of its layered structure, adjustable variability of laminate elements and exchangeability of anions between layers, it has a wide range of applications, such as el...

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Problems solved by technology

Most layered substances are structurally anisotropic and can be unfolded into films for use as functionalized coatings or separators, however, unlike other layered materials, LDHs are not easily cast into thin films and their crystallinity is more difficult to control Orientation in thin films, thus hindering the application development and deviceization of LDHs materials in this field

[0004] In the document Adv.Mater., 2001,13(16):1263, E.Gandner et al. deposited the colloidal solution of LDHs on glass to obtain an alkoxy-intercalated magnesium-aluminum LDHs film. The preparation method was complicated, and the obtained The thickness of the film is more than 30 μm, the film is formed by the accumulation of LDHs powder, and there are LDHs aggregates in the film, which inevitably has defects such as uneven film surface and loose bonding with the matrix.

[0005] In Langmuir, 2002, 18(5): 1580, J.X.He and others deposited the magnesium aluminum carbonate LDHs obtained from the Langmir-Blodgett film on the mica sheet to obtain the LDHs film. The preparation method is also complicated, and the orientation of the film is very poor. , the surface is very rough, easy to peel off into powder

[0006] In the literature Chem.Commun., 2003: 2740 and Langmuir, 1998, 14 (10): 2890, J.H.Lee and K.Yao etc. deposited LDHs crystals in aqueous solution on highly oriented pyrolytic graphite and silicon (100 ) on the wafer, although it has a certain orientation, the LDHs are not continuous, the density is low, and the combination with the substrate is not tight, so the practicability is not high

[0007] The method used in the above literature is to deposit LDHs on the inorganic substrate, however, it is difficult to separate the thin film from the inorganic substrate, and it is difficult to show the functionality of the LDHs thin film alone.

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