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US 2022/0389233 A1Published application
Self-cleaning, anti-soiling coatings with additional functionalities and method of production thereof
AssigneeHanna BENMOSHE
InventorsHanna BENMOSHE, Sven RÜHLE
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Abstract
Mesoporous nanostructured coatings are disclosed. The coatings comprise particles of a refractory material, the particles having diameters <200 nm, connected by a material that is formed from a precursor that is deposited on the substrate with the particles, typically by oxidation of the precursor. The material that connects the particles enhances their necking and adhesion to the substrate. In preferred embodiments, the coatings are multi-functional, combining anti-reflective properties with a second property such as self-cleaning or anti-soiling. A novel method for making the coatings, based on inkjet technology, is also disclosed.
Claims21
-50. (canceled)
A mesoporous nanostructured coating, comprising:
- at least one layer of particles of at least one refractory material;
- at least one second material;
- at least a portion of said particles bound or interconnected one to another by said second material;
- and,
- said second material being a product of a reaction of a precursor material, said reaction occurring with or subsequent to deposition of said particles;
- wherein said mesoporous nanostructured coating is characterized by a characteristic selected from the group consisting of:
- said mesoporous nanostructured coating is characterized by a single layer comprising a plurality of compositions, said compositions disposed according to a predetermined two-dimensional pattern in which said pattern comprises areas of different compositions;
- said mesoporous nanostructured coating is characterized as comprising a plurality of layers of different compositions, said plurality of layers comprising a lower layer comprising particles of an electron-accepting material and an upper layer comprising particles of a hole-accepting material;
- and,
- said mesoporous nanostructured coating is characterized as comprising a plurality of layers of different compositions, said plurality of layers comprising a bottom layer in the form of lines of coating material separated from one another, and at least one additional layer in the form of lines of coating material separated from one another, each of said lines comprising each of said at least one additional layer lying atop a line of coating material of a layer below it.
7 more elements
A method for preparing a mesoporous nanostructured coating on a substrate (1), said method comprising:
- preparing a coating liquid comprising:
- a carrier liquid;
- and,
- at least one material selected from the group consisting of particles of coating material, precursors of coating material, and dispersants;
- depositing said coating liquid onto said substrate;
- drying said coating liquid subsequent to said step of depositing;
- and,
- heating said coating liquid subsequent to said step of depositing;
- wherein said step of depositing said coating liquid onto said substrate is characterized by a characteristic selected from the group consisting of:
- (a) said step of depositing said coating liquid on said substrate comprises:
- depositing a first coating liquid on said substrate in a first predetermined pattern;
- adding, for each additional coating liquid to be used, at least one additional print unit (31) comprising at least one additional print unit print head (30);
- introducing at least one additional coating liquid into each said additional print unit print head;
- and,
- depositing said at least one additional coating liquid onto said substrate in an additional predetermined pattern;
- (b) said step of depositing said coating liquid on said substrate comprises:
- depositing a first coating liquid on said substrate in a first predetermined pattern;
- adding, for each additional coating liquid to be used, at least one additional print unit (31) comprising at least one additional print unit print head (30);
- introducing at least one additional coating liquid into each said additional print unit print head;
- and,
- depositing said at least one additional coating liquid onto said substrate in a second predetermined pattern;
- said first predetermined pattern and said second predetermined pattern together forming a checkerboard pattern;
- (c) said step of depositing said coating liquid on said substrate comprises depositing multiple layers of coating liquid, one atop another, and said multiple layers comprise:
- a first layer (310) comprising transparent conductive electron-accepting material;
- a plurality of semiconductor layers (311, 312) comprising wide-band semiconductors, at least one of which absorbs light in at least a portion of the solar spectrum, deposited sequentially atop said first layer;
- and,
- a top layer (313) comprising transparent hole-accepting material, deposited atop said plurality of semiconductor layers;
- (d) said step of depositing said coating liquid on said substrate comprises depositing multiple layers of coating liquid, one atop another, and said step of preparing a coating liquid comprises:
- preparing a first coating liquid comprising particles of SiO2;
- particles of at least one material selected from the group consisting of SnO2, F:SnO2, and Sb:SnO2;
- at least one first material in solution selected from the group consisting of 1-20 mM Na2SiO3, 0.5-5 mM Na2B4O7, 0.5-5 mM Mg(OAc)2, and, at least one second material in solution selected from the group consisting of 0.1-10 mM PEG and 1-10 mM TPE;
- and,
- preparing a second coating liquid comprising particles of SiO2;
- particles of TiO2;
- at least one material selected from the group consisting of ZrO2 and Al2O3;
- at least one third material in solution selected from the group consisting of 1-20 mM Na2SiO3, 0.5-5 mM Na2B4O7, 0.5-5 mM Mg(OAc)2, and, at least one fourth material in solution selected from the group consisting of 0.1-10 mM PEG and 1-10 mM TPE;
- and,
- said step of depositing said coating liquid onto said substrate in a first predetermined pattern comprises:
- depositing said first coating liquid on said substrate in a first predetermined pattern;
- drying said first coating liquid;
- depositing said second coating liquid on said substrate in a second predetermined pattern;
- and,
- drying said second coating liquid;
- and,
- (e) said step of depositing said coating liquid on said substrate comprises depositing multiple layers of coating liquid, one atop another, and said step of preparing a coating liquid comprises:
- preparing a first coating liquid comprising particles of SiO2;
- particles of SnO2;
- at least one first material in solution selected from the group consisting of 1-20 mM Na2SiO3, 0.5-5 mM Na2B4O7, 0.5-5 mM Mg(OAc)2, and, at least one second material in solution selected from the group consisting of 0.1-10 mM PEG and 1-10 mM TPE;
- preparing a second coating liquid comprising particles of SiO2;
- particles of TiO2;
- at least one third material in solution selected from the group consisting of 1-20 mM Na2SiO3, 0.5-5 mM Na2B4O7, 0.5-5 mM Mg(OAc)2, and, at least one fourth material in solution selected from the group consisting of 0.1-10 mM PEG and 1-10 mM TPE;
- and,
- preparing a third coating liquid comprising dispersed NiO particles;
- 1-50 mM dissolved Ni(NO3)2;
- and, at least one fifth material in solution selected from the group consisting of 0.1-10 mM PEG and 1-10 mM TPE;
- and,
- said step of depositing said coating liquid onto said substrate in a first predetermined pattern comprises:
- depositing onto said substrate a transparent conductive oxide (TCO) layer characterized by a sheet resistance <100 Ω/square;
- depositing said first coating liquid onto said substrate, thereby forming a second layer;
- drying said second layer;
- depositing said second coating liquid onto said substrate, thereby forming a third layer;
- drying said third layer;
- and,
- depositing said third coating liquid onto said substrate, thereby forming a fourth layer.
61 more elements
Dependencies are inferred from the claim text.