Abstract:
L'invention concerne un procédé de dépôt d'un film compact de particules (4) sur la surface intérieure (10) d'une pièce (2), comprenant les étapes suivantes : a) placer la pièce (2) dans un liquide porteur (6); b) générer un flux de liquide porteur (44) dans le creux (8) de la pièce en direction de la surface (18) du liquide porteur, de manière à créer une protubérance (50); c) dispenser les particules (4) pour former un film compact flottant sur le liquide (6) entre une ligne de contact (20) et un front amont (60) de particules; et d) transférer du film (4) sur la surface intérieure (10) en opérant un déplacement relatif entre cette pièce (2) et la surface (18) du liquide porteur, tout en poursuivant la dispense des particules (4) sur le front amont (60).
Abstract:
A molecule (18) for Langmuir-Blodgett (LB) deposition of a molecular layer. The molecule (18) includes at least one switching moiety (26), a hydrophilicity-modifiable connecting group (30) attached to one end of the moiety (26), and a hydrophilicity-non-modifiable connecting group (28) attached to the other end of the moiety (26). The hydrophilicity-modifiable connecting group (30) is transformable to a temporary end group (32) upon adjustment in pH of the aqueous environment containing the molecule (18). The temporary end group (32) is more hydrophilic than the hydrophilicity-modifiable connecting group (30) and the hydrophilicity-non-modifiable connecting group (28). The difference in hydrophilicity between the temporary end group (32) and the hydrophilicity-non-modifiable connecting group (28) causes formation of a substantially well-oriented, uniform LB film at a water/solvent and/or water/air interface (34).
Abstract:
The present disclosure is directed to methods for preparing nanoparticle monolayers on a sub-phase by controlling the spreading rate of the nanoparticles. The nanoparticles are first prepared in a nanoparticle solution at a predetermined concentration with a solvent. The sub-phase solution is prepared to have a density and viscosity compatible with the desired spreading rate. Additives, such as glycerol, are used to alter the density of the sub-phase solution. A volume of nanoparticle solution is deposited on the surface of the sub-phase solution and allowed to spread in a controlled manner on the unconstrained surface, forming a uniform nanoparticle monolayer. A substrate is then placed in contact with the nanoparticle monolayer to form a uniform nanoparticle coating on the surface of the substrate.
Abstract:
This invention generally relates to a method for preparing and transferring a monolayer or thin film. In particular this present invention is an improved version of the Langmuir-Schaefer technique for preparing and transferring a monolayer or thin film, incorporating in situ thermal control of the substrate during the transfer process.
Abstract:
According to the present invention, an ultra-fast method for preparing an organic/inorganic thin film by using self-diffusion effects comprises the steps of: forming a solution by dissolving one or more organic/inorganic materials in a solvent; forming an organic/inorganic thin film by supplying the formed solution onto a liquid substrate; and transferring the formed thin film to a substrate, wherein the step of forming an organic/inorganic thin film forms a thin film on the liquid substrate from the organic/inorganic materials through the occurrence of a self-diffusion phenomenon caused by a difference in surface tension between the liquid substrate and the solution, and through the occurrence of the evaporation of the solvent and the dissolution process of the solvent to the liquid substrate.
Abstract:
The field of the invention relates to systems and methods for surface treatments, and more particularly to systems and methods for surface treatments, modifications or coatings using micro- and nano-structure particles for both super-hydrophobic and super-oleophobic properties. In one embodiment, a method of treating surfaces to impart both super-hydrophobic and super-oleophobic properties includes the steps of pre-treating a substrate surface; assembling dual-scale nanoparticles onto the surface of the substrate; and treating the dual-scale nanoparticle coated surface with SiCl4 to cross-link the nanoparticles to each other and to the surface of the substrate creating a robust nano-structured topographic surface having both super-hydrophobic and super-oleophobic properties.
Abstract:
Method for pore sealing a porous substrate, comprising: forming a continuous monolayer of a polyimide precursor on a liquid surface, transferring said polyimide precursor monolayer onto the porous substrate with the Langmuir-Blodgett technique, and imidization of the transferred polyimide precursor monolayers, thereby forming a polyimide sealing layer on the porous substrate. Porous substrate having at least one surface on which a sealing layer is provided to seal pores of the substrate, wherein the sealing layer is a polyimide having a thickness of a few monolayers and wherein there is no penetration of the polyimide into the pores.
Abstract:
The present invention relates to a structured monolayer that is composed of low-molecular aromatics and fully cross-linked in the lateral direction, the monolayer having a pattern of functional groups on one of the two surfaces, and to a method for preparing such a structured monolayer, as well as to the use thereof.
Abstract:
A method for synthesizing enzyme-catalyzed polymers using the Langmuir-Blodgett technique. In one embodiment, the process comprises spreading one or more enzyme-polymerizable monomers on a water-miscible solvent. The monomers are sufficiently surface active that they align themselves on the air-solvent interface. Next, pressure is applied to the interface to form a monolayer made up of the monomers. An enzyme is then introduced into the solvent, causing polymerization of the monomers in the monolayer. The polymeric monolayers produced by the present method are easier to process and have reduced cross-linking and branching as compared to similar polymers produced in bulk by enzyme-catalyzed reactions.