13 results about "Janus particles" patented technology

This invention discloses a Janus particle crosslinking agent, a two-step preparation method, and its applications, belonging to the field of functional coating technology. The Janus particle crosslinking agent comprises SiO2 particles, one end of which is modified with a hydrophilic isocyanate group, and the other end with a low surface energy material, hydrogen-containing silicone oil. The Janus particle crosslinking agent with the hydrogen-containing silicone oil as the hydrophobic side can achieve directional arrangement, thereby imparting excellent hydrophobic properties to the coating. Utilizing the isocyanate group of the Janus particle crosslinking agent, it can not only exert its crosslinking effect in the coating but also stabilize the toluene / water Pickering emulsion. The two-step preparation method involves using hydrogen-containing silicone oil as a modifier to prepare J(SiO2·PMHS) particles via the Pickering emulsion interface method; then, using isocyanate propyltriethoxysilane as a modifier, a one-pot method is used to prepare the Janus particle crosslinking agent with the isocyanate group as the hydrophilic end and the hydrogen-containing silicone oil as the hydrophobic end. The isocyanate groups in the crosslinking agent are directly modified on one side of the Janus particles, thereby enabling them to play their crosslinking role in the coating and improving the wear resistance of the coating.

The invention provides a preparation method of snowman-shaped Janus particles, the snowman-shaped Janus particles prepared by the method and application of the snowman-shaped Janus particles. The preparation method comprises the following steps: 1, preparing solid microspheres by using a stepped asymmetric T-shaped tube with a micro-channel; 2, silicon oxide is prepared on the surfaces of the solid microspheres through a polymerization reaction and a sol-gel reaction; wherein the snowman-shaped Janus particles comprise a microsphere part and a convex part in contact with the microsphere part, the microsphere part is a solid microsphere containing a cross-linked polymer, the convex part contains silicon oxide, and the average particle size of the snowman-shaped Janus particles is 0.5-60 [mu] m. The snowman-shaped Janus particle disclosed by the invention is adjustable in particle size, uniform in distribution and high in particle size stability, and has the characteristics of good biocompatibility and excellent stability and mechanical strength.

The present invention relates to Janus particles for detecting a target material and a method for detecting a target material using same and, more specifically, to Janus particles for detecting a target material and a method for detecting a target material using same, wherein the Janus particles vary in orientation depending on whether a mass label is bound thereto, and, by including a first surface and a second surface satisfying formula 1, are simple and economical and have high sensitivity.

The invention relates to a magnetic snowman-shaped Janus particle and a manufacturing method thereof. The magnetic snowman-shaped asymmetric Janus particle comprises a hydrophilic part and an oleophylic part, the hydrophilic part comprises solid or porous polymer microspheres subjected to hydrophilic modification and at least one part of magnetic nanoparticles attached to the surfaces of the polymer microspheres, the oleophylic part comprises silicon oxide subjected to hydrophobic modification, and the size of the Janus particle ranges from 200 nm to 1500 nm. The magnetic snowman-shaped asymmetric Janus particle disclosed by the invention is high in magnetic response speed and excellent in settleability, solvent resistance and mechanical strength.

The present application relates to the technical field of functional coating materials, and particularly relates to a Pickering emulsion containing Janus particles and a preparation method and application thereof, the preparation method comprising the following steps: hydrophilic particles are subjected to a silanization reaction to obtain hydrophobic modified particles; a film-forming polymer is mixed with a solvent as an oil phase; the hydrophobic modified particles, the oil phase and an ionized water solution of a bonding compound are mixed, and after ultrasonic emulsification, a Pickering emulsion is obtained. In the present application, the hydrophobic modified particles are used as Pickering stabilizers, the ionized water solution of the bonding compound with both reactivity and bonding function is used as an aqueous phase, and the solvent containing a low-surface-energy film-forming polymer is used as an oil phase. In the process of high-shear emulsification, the hydrophobic modified particles migrate to the oil-water interface, the strong alkaline environment provided by the ionized water solution of the bonding compound hydrolyzes the hydrophobic layer on the side of the hydrophobic modified particles in contact with the aqueous phase, and the surface of the particles is in situ changed from isotropic hydrophobicity to hydrophilic / hydrophobic amphiphilic Janus structure.

The present invention relates to the technical field of colloid and interface chemistry, and disclosed are a method for preparing a high-stability W / O / W-type multiple Pickering emulsion on the basis of Janus particles, and a use. The present invention uses alkylsilanes of different chain lengths to modify SiO2, thereby preparing Janus particles having distinct hydrophilic and hydrophobic properties, which jointly stabilize a multiple emulsion; and different types of Janus particles are adsorbed on different oil-water interfaces, fully exerting the interfacial activity and amphiphilicity of the Janus particles, thereby preparing a high-stability multiple emulsion. The multiple emulsion of the present invention has excellent stability, and remains stable under conditions such as long-term storage, strong acids and bases, and high-concentration electrolytes, thereby effectively expanding the practical application of the multiple emulsion.

The application provides a Janus particle based on GMA monomer emulsion polymerization and a preparation method and application thereof, and belongs to the technical field of functional materials; the application first synthesizes functional composite particles with fine controllable morphology and structure based on GMA monomer in one step, and then prepares amphiphilic PFC-PGMA-NH2 Janus particles based on the functional composite particles; the particles prepared by the method have a topological structure that can be accurately controlled, and the method has the advantages of simple process, low cost and environmental friendliness; the PFC-PGMA-NH2 Janus particles are expected to be used for protein immobilization and interfacial biological catalysis, and have good practicability.

A 3-D printer apparatus has a tank that includes a bottom wall and a printing area that is located above and spaced apart from the bottom wall. At least a portion of the tank is filled with a polymerizable resin used to print an object within the printing area. The bottom wall is transparent and defines an upper surface. A layer of Janus particles overlays the upper surface of the bottom wall. Each of the Janus particles has a hydrophobic side and a hydrophilic side, with the hydrophilic side directly overlaying the upper surface of the bottom wall. The layer of Janus particles defines a barrier that prevents small bits of cured polymerizable resin within the tank from becoming attached to the upper surface of the bottom wall during the printing process.

The application provides a soap-free high-efficiency fluorine-containing easy-to-remove finishing agent prepared by Janus Pickering method, a preparation method and application on fabrics, and the finishing agent comprises the following components in percentage by mass: effective substance 25% and water. The effective substance is obtained by emulsion polymerization reaction of perfluorohexyl ethyl methacrylate, methacryloyloxyethyl trimethyl ammonium chloride, methoxy polyethylene glycol methacrylate, octadecyl methacrylate and hydroxyethyl methacrylate. The stabilizer used is fluorinated Janus particles obtained by asymmetric modification of SiO2 particles. The application of the application eliminates the use of small molecule emulsifiers, has better three-proofing effect and easy-to-remove effect, and has better washing resistance compared with the prior art. The application belongs to an environmentally-friendly finishing agent, has no biological toxicity and non-degradability, has simple process, mild conditions, and green and efficient production process.

The invention provides hollow amphiphilic Janus particles as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) taking a linear polystyrene seed emulsion as a dispersion phase; taking a first surfactant as a water phase, taking a divinyl benzene monomer and a first initiator as an oil phase, emulsifying the water phase and the oil phase, adding the dispersed phase, and polymerizing to obtain PS / PDVB nanosphere emulsion; (2) removing oxygen to obtain a seed emulsion, dropwise adding the pre-emulsion, and reacting to obtain Janus particles; the pre-emulsion contains a second surfactant, a second initiator and a silane coupling agent; (3) dispersing in a first organic solvent, and carrying out solid-liquid separation to obtain SiO2 (at) PDVB particles; and (4) dispersing in a second organic solvent, adding a silane modifier containing an epoxy group, and reacting to obtain the hollow amphiphilic Janus particles. The hollow amphiphilic Janus particles prepared through seed emulsion reaction are high in controllability and can be prepared on a large scale.

The invention provides snowman-shaped Janus particles as well as a preparation method and application thereof. The snowman-shaped Janus particle is provided with a microsphere part and a protruding part located on the surface of the microsphere part, the microsphere part is a solid microsphere containing a cross-linked polymer, the protruding part contains silicon oxide, and the average particle size of the snowman-shaped Janus particle is 0.5-80 micrometers. The snowman-shaped Janus particle disclosed by the invention is adjustable in particle size, uniform in distribution and high in particle size stability, and has the characteristics of good biocompatibility and excellent stability and mechanical strength. The snowman-shaped Janus particles with different particle sizes can meet different drug loading and adsorption requirements.

The invention relates to a composite snowman-shaped Janus particle as well as a preparation method and application thereof. The composite snowman-shaped Janus particle has an organic polymer part and a silicon-containing material part, the organic polymer part is a solid sphere containing a linear polymer and a cross-linked polymer, the silicon-containing material part contains silicon oxide, and the size of the composite snowman-shaped Janus particle is 0.5-60 [mu] m.