78 results about "Janus particles" patented technology

The invention discloses a Janus particle with double properties and a preparation method thereof. By employing cross-linked polymer colloidal particles as seeds and through a seed emulsion polymerization method, Janus particles with double properties are obtained on the basis of a phase separation mechanism; inorganic, metal and metal oxide compounded Janus particles with electrical, magnetic, optical properties are obtained through functional group modification and composition of function materials and can be used for the material field. The Janus particles have an emulsifying property in organic, inorganic dispersed phases or different organic dispersed phases and meanwhile the Janus particles have a great application prospect in the aspects of self-assembly, superhydrophobicity, nanomotor and the like. The preparation method provided by the invention is easy to operate, has the feasibility of mass production and can adapt to different needs by modification and composition of function materials.

The invention discloses a compound Janus colloid particle and a modified Janus colloid particle as well as preparation methods thereof. Inorganic particles are taken as seeds, and a silane coupling agent modification method, a seed emulsion polymerization method, an inorganic surface etching method, method for inducing recombination functional materials by using polymer gel, and the like are combined to prepare inorganic/polymer, inorganic/inorganic, inorganic/metallic, inorganic/metallic oxide Janus particles. The structure and the size of the Janus particle can be controlled by controlling the activity of reactants, feeding speed, and the concentration of reactants, and the compounding of various kinds of materials can be realized. The Janus particle provided by the invention not only has good dispersibility, but also has good strength and size stability.

The invention discloses a preparation method of molecular colloidal photonic crystal beads. The molecular colloidal photonic crystal beads prepared through the method have the characteristics of adjustable particle size, controllable morphology, superior monodispersity and the like. The method comprises a step of constructing a three-phase micro-fluidic channel, a step of preparing a double-faced liquid drop template, a step of preparing solid-liquid coexistence Janus particles, and a step of preparing the molecular colloidal photonic crystal beads.

The invention discloses a method for synthesizing polymer Janus particles with chemical and topological anisotropic properties. The synthesis method means subjecting hydrophobic monomers and hydrophilic monomers to a copolymerization reaction at an oil-water interface by an interfacial polymerization method, thereby obtaining the polymer Janus particles with chemical and topological anisotropic properties. The polymer Janus particles synthesized by the method simultaneously have chemical and topological anisotropic properties, chemical ingredients can be randomly regulated, and surfaces of the polymer Janus particles can be modified again; and meanwhile, a topological structure is adjustable, and thus, the synthesis of anisotropic polymer Janus particles of a variety of morphological structures can be achieved. The method disclosed by the invention is simple in synthesis process, easy in control of experimental conditions and easy and feasible in aftertreatment method and has a certain industrialized application value.

The invention relates to the field of oil and gas drilling, in particular to super-amphiphobic Janus particles suitable for a chip carrying agent for an oil base drilling fluid and a preparation method and an application thereof. The Janus particles are silicon dioxide nanoparticles with dissymmetric modification on surfaces, wherein the part of surfaces of the Janus particles are modified by a first modifying group provided by silane as shown in a formula (1) and the rest parts of surfaces of the Janus particles are modified by a second modifying group provided by silane as shown in a formula(2). By combining the particularity of Janus particle structure and the performance asymmetricity, the particles play bubbling and stabilizing roles in an emulsified oil base drilling fluid. An efficiently chip carrying oil base drilling fluid system formed by taking the super-amphiphobic Janus particles chip carrying agent as a core treatment agent improves the drilling speed and the well purification efficiency of a complex well, thereby further promoting continuous exploration and development of irregular oil and gas reservoirs. The formulae are as shown in the description.

For defects that existing hemostasis research and products cannot intelligently perform self-propelling or cannot be driven to forward deep in the wound under the action of external field force, the invention provides a preparation method for a janus structure based rapid hemostatic agent having a directional propulsion function. The preparation method includes performing esterification on microporous starch to unidirectionally grow calcium carbonate particles so as to obtain esterified microporous starch/calcium carbonate Janus particles; fixedly assembling thrombin on the surfaces of the esterified microporous starch/calcium carbonate Janus particles to obtain esterified microporous starch/calcium carbonate Janus particles assembled with the thrombin; mixing the esterified microporous starch/calcium carbonate Janus particles assembled with the thrombin and protonated tranexamic acid powder so as to obtain the janus structure based rapid hemostatic agent having a directional propulsion function. Through the formation of the biphasic heterogeneous Janus structure, the unidirectional and intelligent self-propulsion of hemostatic starch can be realized by cooperating with the protonated tranexamic acid, so that rapid three-dimensional hemostasis on deep wounds, penetrating wounds and irregular wounds such as aortic / venous rupture can be realized.

Dissymmetric particles also called Janus particles of micron or submicron size and methods of synthesis of Janus particles by bipolar electrochemistry, based on substrates of isotropic or anisotropic shape. The particles include an electrically conductive substrate having at least a chemically and/or physically modified part by deposit of a layer of electrochemically depositable material, and a non-modified part. The particles are of isotropic shape, and the layer of electrochemically depositable material has a specific shape delimited by a precise contour.

The invention discloses a cone-shaped Janus particle and its preparation method and application. The underside material of the cone-shaped Janus particle is a hydrophobic polymer and is formed by polymerization of monoolefine monomer; and the side material of the particle is a hydrophilic material and is formed by sulfonation hydrophilic modification of a hydrophobic polymer or formed by hydrophobic polymer surface grafting with a hydrophilic polymer. The side face of the cone-shaped Janus particle can also undergo hydrophobic modification and the bottom surface undergoes amino-modification. The cone-shaped Janus particle can be used in particle emulsifiers, and also can be used in preparing a surface coating of a material, especially a hydrophobic surface coating.

The invention provides a method of preventing or reducing the growth of crystals in a substance which is susceptible to crystal growth in which colloidal particles having an amphiphilic structure, e.g. Janus particles, are contacted with the substance. Colloidal particles suitable for use in the invention include cross-linked, colloidal materials formed from hydrophobic monomers such as acrylates or methacrylates and hydrophilic monomers such as those derived from acrylic and/or methacrylic acid. The colloidal particles find particular use in methods of cryopreservation of biological samples (e.g. cells, tissues or organs), as a texture modifier in frozen food products, in the inhibition of gas hydrate formation, and as scale inhibitors.

The invention discloses a method for preparing Janus particles based on a lysozyme nano-film. The method comprises the steps: modifying micro-nano-particles by adopting a phase-transition lysozyme nano-film so as to prepare the Janus particles with different particle sizes, shapes and material quality. The method disclosed by the invention has the advantages of simple and high-efficient modification processes, low cost, greenness, environmental protection; and the method has extremely high universality; the Janus micro-nano-particles of inorganic and organic polymer types can be prepared, andthe problems of poor universality and biocompatibility of a conventional modification method as well as harsh conditions, complicated steps and the like of the preparation method are overcome.

The invention relates to an oil-water separation method based on magnetic Janus particles. The oil-water separation method comprises the following steps: a) putting the magnetic Janus particles into an oil-water mixture, emulsifying at the speed of 13000-20000 r/min by using a high-speed shearing emulsifying machine or emulsifying at the speed of 300-5000 r/min by using a high-speed stirring machine to form an emulsion system comprising a continuous phase and a dispersed phase stabilized by the magnetic Janus particles, wherein each of the magnetic Janus particles simultaneously has a hydrophilic portion and a hydrophobic portion; and b) applying an external magnetic field A to the emulsion system such that the dispersed phase aggregates to form the emulsion system into an enriched emulsion fraction enriched with the dispersed phase and a liquid fraction free of the dispersed phase, thereby separating the enriched emulsion fraction from the liquid fraction.

The invention relates to a method for constructing a super-hydrophobic wear-resistant leather coating layer based on amphipathic hollow silicon dioxide Janus particles. The method comprises the stepsof preparing reactive amphipathic hollow silicon dioxide Janus particles through the combination of a Pickering emulsion method and a click chemistry method, and generating chemical crosslinking between hydrophilic ends with reaction activity in the amphipathic hollow silicon dioxide Janus particles and a base material by virtue of a layer-layer coating method to enable hydrophobic ends to extendto the surface of a coating layer, so as to obtain the super-hydrophobic wear-resistant leather coating layer. A result shows that the water contact angle of the constructed super-hydrophobic wear-resistant leather coating layer is over 170 degrees, and the hydrophobic durability and wear resistance of the constructed super-hydrophobic wear-resistant leather coating layer are both relatively good.After a water drop is remained on the surface of the coating layer for 30 minutes, the contact angle is still over 150 degrees; and when the coating layer is seriously worn after a leather sample isrubbed for 300 times, the coating layer still has a super-hydrophobic effect.

The invention relates to a noble metal/polymer microsphere Janus particles and a preparation method thereof and relates to a composite material having dual properties and a preparation method thereof. The composite material uses a polymer microsphere having a core-shell structure as a carrier, the surface of the polymer microsphere is loaded with noble metal, and the structure and the size of the Janus particles are controlled by controlling the activity and concentration of reactants. The Janus particles have good dispersibility and size stability. The preparation method is simple and feasible, has feasibility in large-scale production and moreover satisfies different requirements by modification and functional decoration on the shells of the polymer microspheres, so that the noble metal/polymer microsphere Janus particles have potential application prospect in the fields of emulsion stabilization, optics, biosensing, drug delivery and electronics.

The invention provides an electrochemical immunosensor as well as a preparation method and an application thereof. Janus particles with hydrophilic/hydrophobic properties are prepared with aptamer/octadecanethiol as functional groups and are used for modifying a glassy carbon electrode, and the electrochemical immunosensor is prepared. The sensor prepared with the method can be used for detecting beta-receptor agonist ractopamine. By means of the method, the sensitivity and the selectivity of the electrode are improved, so that the electrode modification process is simpler and more convenient, and the electrochemical immunosensor has good stability and reproducibility and can be applied to detection of ractopamine in human urine.

The invention discloses a hydrogel-hydrophobic Janus particle and a preparation method thereof. In the method, a toxic-free solvent and a bio-compatible material are used for preparing the hydrogel-hydrophobic Janus particle. The method includes the steps of: dissolving the hydrogel biomaterial and the hydrophobic biomaterial in water, and generating mono-dispersed emulsion with a flow-focusing micro-fluidic device; changing external conditions to separate a hydrophobic organic high-molecular phase out and form a hydrophobic semi-sphere around drops; adding an ionic substance, which can be crosslinked with the hydrogel material, so that the hydrogel phase is crosslinked with the ionic substance to form hydrogel semi-sphere, and finally, the two organic high-molecular phases are subjected to molecule winding during phase separation so as to form an integrated structure, thus obtaining the hydrogel-hydrophobic Janus particle. The particle has high stability and is controllable in size. As a surfactant, the particle can solve the problem such as instability of a micro-emulsion and the like.

The invention belongs to the field of rubber and plastic filler and particularly relates to polystyrene/silicon dioxide organic-inorganic hybrid Janus nano-particles grafted with polymers on the surface by utilizing a plurality of chemical reactions as well as a preparation method and an application thereof. According to the preparation method of the hybrid Janus nano-particles obtained through polymer grafting modification, the single spherical surface or dual spherical surfaces of the Janus nano-particles comprising polystyrene spheres and silicon dioxide spheres which are connected through chemical bonds are grafted with the polymers, wherein the dual spherical surfaces are grafted with the same or different polymers; after a rubber material is filled with the polystyrene/silicon dioxide organic-inorganic hybrid Janus nano-particles grafted with polymers, the dispersity is good, the stress at definite elongation and the general storage modulus of the rubber material are increased, the abrasive resistance, tearing resistance, strength and elongation at break are all obviously improved. Especially for different rubber blended systems, the Janus nano-particles grafted with different rubber molecules can remarkably improve the mixing effect of different rubbers, so that the general property of multi-element rubber can be given a full play.

The invention discloses a method for constructing artificial cells based on Janus magnetic nanoparticles and a DNA directional immobilization technology, and belongs to the field of artificial cell preparation. The preparation method comprises the following steps: firstly, preparing single-stranded DNA modified Janus magnetic nanoparticles and complementary single-stranded DNA functionalized glucose oxidase and horseradish peroxidase; mixing the Janus particles with an enzyme, and realizing immobilization of the enzyme through DNA complementary hybridization; jointly incubating immobilized double enzymes and tannic acid, realizing encapsulation of the immobilized enzymes through self-polymerization of the tannic acid, and constructing the artificial cell with a compartment structure. The artificial cell prepared by the method is simple in preparation process, mild in condition, high in internal enzyme activity, easy to separate from a reaction system and excellent in stability, and canbe used for simulating cascade reaction in natural cells.

The invention provides a phase-change microcapsule based on an inorganic shell layer and a preparation method and application thereof. The Janus particle-containing composite wall material-coated phase change microcapsule based on the inorganic shell layer is obtained by stabilizing an emulsion through Janus particles and utilizing a sol-gel reaction at a water-oil interface. The phase change microcapsule based on the inorganic shell layer has controllable phase change temperature and high enthalpy retention rate, and the supercooling degree of a solid-liquid phase change material is effectively reduced. The phase-change microcapsule based on the inorganic shell layer is low in breakage rate in the using process, free of leakage of phase-change materials and volatile gas, excellent in using stability, safe and environmentally friendly. In addition, the phase change microcapsule coated with the composite wall material can be prepared in a green manner, and no toxic volatile substance isgenerated in the preparation process. The phase change microcapsule is simple in process and short in production period, and has a prospect of industrial batch production.

The invention provides a preparation method of a janus structure hemostatic with a directional driving function, aiming at the defects that a bubble-driven powder hemostatic in the prior art has a better effect on deep, penetrating and aortic/venous rupture wounds, but cannot penetrate into bleeding points in deep parts of the wounds to effectively block the irregular or curved wounds, the hemostatic effect is not ideal, and rapid hemostasis cannot be realized. The preparation method comprises the following steps of: carrying out unidirectional self-aggregation on magnetic nano-iron oxide by utilizing esterified microporous starch to obtain esterified microporous starch/nano-iron oxide janus particles; carrying out immobilized assembly on thrombin on the surfaces of the esterified microporous starch/nano-iron oxide Janus particles, and coating the surfaces with sodium bicarbonate to obtain sodium bicarbonate coated and thrombin assembled esterified microporous starch/nano-iron oxide Janus particles; and then mixing the sodium bicarbonate coated and thrombin assembled esterified microporous starch/nano-iron oxide Janus particles with protonated acidic salt powder to obtain the janus structure hemostatic with the directional driving function.

The invention discloses an organic/inorganic hybrid ABC three-component Janus particle and a preparation method thereof. The preparation method comprises the following steps: 1) dispersing polymer microspheres in water to obtain a seed emulsion 1; 2) adding a silane coupling agent emulsion into the seed emulsion 1, carrying out a polymerization reaction, generating phase separation to obtain a Janus particle emulsion, and drying to obtain organic and inorganic partially separated Janus particles; 3) dispersing the Janus particles in a solvent, adding a silane coupling agent, reacting to obtaina hydrophobically modified Janus particle emulsion, and drying to obtain hydrophobically modified Janus particles; 4) dispersing the modified Janus particles in water to obtain a seed emulsion 2; and7) adding a silane coupling agent emulsion into the seed emulsion 2, carrying out a polymerization reaction, generating phase separation to obtain a Janus particle emulsion, and drying to obtain theorganic/inorganic hybrid ABC three-component Janus particles.

The invention discloses a method for preparing a papermaking sizing emulsion based on cationic Janus particles, and belongs to the technical field of papermaking sizing. The method can solve the problems that emulsification effects of a sizing emulsion prepared by using cationic starch, Pickering granules and the like are not good. The preparation method comprises the following steps: firstly preparing a starch-stabilized seed emulsion, adding a cationic monomer and a cationic initiator to prepare the cationic Janus particles, mixing the cationic Janus particles and a sizing agent, and performing full emulsification to obtain the papermaking sizing emulsion. When the preparation method of the sizing emulsion provided by the invention is used for the papermaking sizing, stability and the sizing effects can be improved, and the cationic Janus particles can be adsorbed on the surface of negatively-charged fibers to improve a utilization rate of the Janus particles; and compared with the sizing emulsion prepared by adopting the cationic starch or the Pickering granules, the sizing emulsion provided by the invention has obviously-improved sizing efficiency.

Janus particles, including biodegradable, biocompatible, anisotropic, amphiphilic Janus nanocolloids, and their use in stabilizing emulsions and cleansing are described.

The present invention provides a process for forming a substance with a superstructure and a process for forming Janus particles. The novel application of the substance with the superstructure and the Janus particles are also disclosed in the present invention. The substance with the superstructure comprises vesicle and hydrogel. The vesicle and hydrogel are prepared in a solution with different ionic strength range.

The invention discloses a method for preparing hollow Janus particles in different particle diameter ranges. The method comprises the following steps of taking hollow glass beads as carriers and carrying out simple preprocessing on surfaces of the hollow glass beads to obtain hollow glass bead solution; carrying out spin coating on the hollow glass bead solution on a single-side polished silicon wafer under different spin speeds through utilization of a spin coating technology; after the spin coated silicon wafer is dried, carrying out rapid preparation of the hollow Janus particles of different types and different particle diameters through utilization of an electron beam evaporation coating technology or magnetron sputtering coating technology. The preparation method provided by the invention is rapid, is high in stability and is not influenced by other interference factors. The particle diameter application ranges of the prepared hollow Janus particles are wide, the dispersity of the particles is high, and the particles are beneficial for carrying out direct application research.