85 results about "Water in oil microemulsion" patented technology

A microemulsion delivery system containing a well treatment agent in a water-in-oil microemulsion may be used for well remediation as well as in other treatment operations including stimulation, acidizing, and drilling. In addition, the water-in-oil microemulsion delivery system may be used to clean surface equipment and downhole equipment.

An environmentally acceptable water-in-oil microemulsion composition includes at least one emulsifying surfactant, at least one biodegradable hydrocarbon solvent, at least one co-solvent, at least one hydrocarbon co-surfactant, and water. The microemulsion composition may be used in a method for rendering fluids from oil external to water external. The microemulsion composition may be combined with water or a water based fluid to produce a spacer fluid utilized in removing oil and oil-residues from a surface, particularly that of wellbores in the drilling of oil and gas wells.

Oil-in-water microemulsions which can be used to incorporate lipophilic water-insoluble materials, such as beta-carotene, into food and beverage compositions are disclosed. The microemulsions utilize a ternary food grade emulsifier system which incorporates a low HLB emulsifier, a medium HLB emulsifier, and a high HLB emulsifier. The microemulsions of the present invention allow for the incorporating of water-insoluble materials in an effective and easy-to-process manner while providing formulational flexibility and without significantly affecting the taste of the underlying food or beverage product. Food and beverage products including the microemulsions are also disclosed. Finally, the method of preparing the microemulsions is described. The invention also encompasses water-in-oil microemulsions for use in incorporating water-soluble materials into food and beverage products. Finally, the invention encompasses concentrate compositions used for making those microemulsions.

A well treatment microemulsion includes an oil external phase, an internal aqueous phase and a hydrophilic surfactant. The surfactant has a hydrophile lipophile balance of between 8-18. The oil external phase may include d-Limonene, xylenes, light mineral oil, or kerosene. The surfactant is configured to emulsify the water of the internal aqueous phase into the oil of the external (continuous) phase. The surfactant may include polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan tristearate, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monolaurate or mixtures therebetween. The use of hydrophilic surfactants to emulsify an internal aqueous phase within an oil external microemulsion produces unexpected and beneficial results.

Disclosed are silica-coated nanoparticles and a process for producing silica-coated nanoparticles. Silica-coated nanoparticles are prepared by precipitating nano-sized cores from reagents dissolved in the aqueous compartment of a water-in-oil microemulsion. A reactive silicate is added to coat the cores with silica. Also disclosed are methods for functionalizing silica-coated nanoparticles for use in a variety of applications.

The invention relates to a silica fluorescent nanoparticle and a preparation method thereof, in particular to an FITC-doped silica fluorescent nanoparticle and the preparation method thereof. The method particularly comprises the preparation of a precursor solution and other steps. The FITC is reacted with 3-aminopropyl trimethoxysilane to prepare a precursor, and then the novel FITC-doped silica fluorescent nanoparticle is prepared by a water-in-oil microemulsion method. The prepared nanoparticle is uniformly spherical, has good monodispersity and light stability, difficultly generates dye leakage, has good response to the pH value and can be applied to the real-time monitoring of the pH value of cells.

A preparation method of polyvinyl alcohol/hydroxyapatite (PVA/HA) composite microspheres belongs to preparation methods of composite water-in-oil emulsion system microspheres. PVA and HA precursors are used as raw materials to prepare a clear and transparent mixed solution; the clear and transparent mixed solution is dispersed into an oil phase containing a surfactant to form a homogeneous water-in-oil microemulsion; and the PVA/HA composite microspheres can be finally obtained by successive crosslinking reaction under acid-catalyzed conditions, HA deposition under alkaline conditions, product centrifugation, washing, drying and other processes. The method has the advantages of simple process, good repeatability, low energy consumption and low cost, and effectively solves the problems that inorganic nanoparticles are easy to agglomerate in the microspheres to cause uneven structures and poor comprehensive performances and the like. The composite microspheres prepared by the method have the advantages of regular morphology, high dispersibility, uniform microstructure, good biocompatibility, biological activity and adsorption performance, and can be used as drug carrier materials, bone repair materials, environmental water treatment materials, cosmetics or food additives and the like.

The invention discloses a lithium sulfur battery positive electrode material and a preparation method thereof, wherein the lithium sulfur battery positive electrode material includes a sulfur carbon nano composite material, the sulfur carbon nano composite material includes carbon nanotubes, TiO2 nano particles and nano sulfur powder, the carbon nanotubes are intertwined to form micron grade carbon balls with nano micropore structures which are interconnected, the TiO2 nanoparticles areuniformly dispersed and embedded in the micron grade carbon balls to form composite carbon microspheres, and the nano sulfur powder is evenly filled in the composite carbon microspheres. Sulfur is infiltrated into the composite microspheres which are formed by coating of the TiO2 nanoparticles with the carbon nanotubes, and the lithium sulfur battery positive electrode material is prepared in a water-in-oil microemulsion system. The obtained material is a regular spherical structure with monodispersity and uniformity. After sulfur infiltration, the sulfur is uniformly filled into the microspheres, and the capacity is fully utilized during charging and discharging processes, and the structure can be controlled at the same time.

A Pt/graphene catalyst comprises graphene as carrier, and Pt loaded on the graphene. The use of graphene as carrier for the catalyst takes advantage of the ion effect and two-dimensional ductility of graphene, which increases the stability of the catalyst. The catalyst is prepared by a reverse micelles system method which provides a micro-environment (i.e. water-in-oil microemulsion), so that the particle size of the resulting nano-particles can be regulated easily and is more uniformly distributed. The use of the catalyst in electrochemostry is also disclosed.

The invention discloses a method for preparing salt-shelled nano compound particles, comprising: dispersing nano compound particles in a soluble salt solution, mixing cyclohexane and octyl phenol polyethylene ether according to a certain ratio to prepare water-in-oil microemulsion, and demulsifying, centrifuging and drying the microemulsion to obtain the nano compound particles with surface soluble salt shells. The particles coated with soluble salt shells may be calcined at salt melting point and may be washed with water to obtain high-crystallinity disperse nano particles. The method greatly broadens a temperature range for preparing diverse nano materials, preventing the nano particles from being sintered at a high temperature.

A Pt—Ru nano-alloy/graphene catalyst comprises graphene as a support, and a Pt—Ru nano-alloy loaded on the graphene. The use of graphene as support for the catalyst takes advantage of the ion effect and tow-dimensional ductility of graphene, which increase the stability of the catalyst. The catalyst is prepared by a reverse micelles system method which provides a micro-environment (i.e. water-in-oil microemulsion), so that the particle size of the resulting nano-alloy particles can be regulated easily and is more uniformly distributed. The use of the catalyst in electrochemistry is also disclosed.

The invention relates to a preparation method of CdSe/SiO2 quantum dot composite fluorescent nanoparticles, which comprises the steps of: synthesizing CdSe quantum dots in a water solution at room temperature by using EDTA as a stabilizing agent and using the electron beam irradiation method; and then, preparing core-shell type fluorescent nanoparticles of which the CdSe quantum dots are coated by silicon dioxide with amino groups on surfaces by using the water-in-oil microemulsion method and using the cohydrolysis of 3-aminopropyl trimethoxysilane (APTMS) and tetraethoxysilane (TEOS). The prepared nanoparticles which are uniformly spherical have the particle diameter of 200+/-8nm, have good monodispersity and light stability, and can not cause fluorescent molecule leakage easily. The quantum dot composite nanoparticles can be effectively absorbed by neural stem cells of a mouse, stronger fluorescence signals are detected in the cells, and a clear fluorescence imaging picture is obtained.

The present invention is process of antiseptic graft polymer in micron and nanometer composite structure, and belongs to the field of polymer technology. The process includes adding solvent, triethylamine and acyl chloride with unsaturated C=C double bond into solution of tertiary amine with hydroxy radical to obtain product A; adding solvent and benzyl halide for reflux reaction to obtain product B; dissolving the product B separately in water and oily solvent; compounding water-in-oil microemulsion with the water solution, the oily solution and non-ionic surfactant and adding photoinitiator; irradiating with ultraviolet ray for reaction; extracting the grafted polymer with mixed solvent of water and acetone and drying. The antiseptic graft polymer in micron and nanometer composite structure has great specific surface area and specific antiseptic function and is used as antibiotic material for clothing, appliance, sanitary ceramic product, etc.

A polyacrylamide based agricultural composition as a microemulsion is provided in form of a water-in-oil microemulsion with polyacrylamide dissolved in the water phase where the polyacrylamide solids content is from about two up to about 15 percent by weight, which is then further diluted in water at the time of use to impart the desired characteristics of the polymer to the water phase or to the material to which the water phase is applied.

A water-oil type micro-emulsion having high safety to a living body by decreasing the amount of a surfactant to be used or not using the surfactant, and at a high ratio of aqueous phase capable of dissolving effective ingredients, the water-in-oil type micro-emulsion comprising polyvinyl pyrrolidone and one or more of members selected from the group consisting of fatty acids which are liquid at a normal temperature and higher alcohols which are liquid at a normal temperature.

The invention discloses a method for preparing a vermicular mesoporous tungsten carbide/charcoal composite material. The method comprises the following steps: (1) dissolving a surfactant in a mixed solution of ethanol and water, sequentially adding a carbon source and a tungsten source, and violently stirring for 15 to 60 minutes to form water-in-oil microemulsion; (2) putting the microemulsion obtained in the step (1) in an open utensil, evaporating at the temperature of between 30 and 60 DEG C to remove a mixed solvent, and curing at the temperature of between 100 and 150DEG C for 6 to 48 hours to obtain a solid product; and (3) in reducing atmosphere, calcining the solid product obtained in the step (2) at the temperature of between 700 and 1,600DEG C for 1 to 7 hours, and cooling and grinding to obtain the vermicular mesoporous tungsten carbide/charcoal composite material. The method has simple steps, quick and time-saving; and the prepared vermicular mesoporous tungsten carbide/charcoal composite material has the characteristics of vermicular pores, uniform distribution of tungsten carbide particles, single phase and the like.

The invention relates to a spot-removing essence emulsion. Active ingredients of the spot-removing essence emulsion comprise 0.5-8 parts of an ingredient A selected from zinc dioxide and titanium dioxide, 3-15 parts of an ingredient B selected from hyaluronic acid and tartaric acid, 3-15 parts of an ingredient C selected from tranexamic acid and ferulic acid, 5-25 parts of an ingredient D selected from ascorbic acid and 3-16 parts of an ingredient E selected from arbutin and barbaloin. The spot-removing essence emulsion is obtained by mixing emulsification of water-in-oil microemulsions comprising the ingredients C, D and E, an oil-in-water emulsion comprising the ingredient A, a coated emulsion comprising the ingredient B and a colorant. The spot-removing essence emulsion is designed based on a skin cell directional penetration technology (5XCell-Technology) and realizes directional penetration and layer-by-layer action of different active ingredients in different skin cell layers thereby producing substantial spot removing efficacy.

The invention provides a polishing solution used for monopotassium phosphate (KDP) crystal. The polishing solution is composed of an oil phase, a surface active agent and a KDP aqueous solution, and is a special water-in-oil microemulsion. Under the role of the surface active agent, the KDP aqueous solution with certain concentration is dispersed as a dispersion phase into the oil phase in a nanoscale liquid drop form. In the polishing process, due to extrusion force and friction stress, the KDP aqueous solution liquid drop breaks through an interfacial film composed of the surface active agent and molecules of the oil phase, reaches the surface of the KDP crystal, and generates a slow-release deliquescence effect with an embossment part on the surface of the KDP crystal; by changing the concentration of the KDP aqueous solution to conduct adjustment and control on the deliquesce effect, finally removal of precision parts on the surface of the KDP crystal is achieved; no new substances generate in the polishing process and external residues are organic matters, surface cleaning can be achieved through the cleaning with a matched organic solvent, and secondary damages are not caused. A preparing method of the polishing solution is simple, the property of the polishing solution is stable, and the polishing solution can effectively weaken flying cut knife grain, reduce surface roughness, and provide favorable technological supports for creating super smooth and clean KDP surface.

The invention discloses a nano calcium carbonate transparent dispersoid and a preparation method thereof and belongs to the technical field of the dispersoids. The nano calcium carbonate white oil dispersoid is prepared in one step by using white oil as a dispersing medium, and a method for enabling nano calcium carbonate to form inverted water-in-oil microemulsion in an organic solvent. The preparation method comprises the following steps: a surface active agent, the white oil, the organic solvent, Ca(OH)2 and an accelerator are used as raw materials, and CO2 is inlet to synthesize the nano calcium carbonate white oil dispersoid with the solid content of 10-60 percent and the alkaline value of 200-500 milligrams of KOH per gram. A product synthesized by the preparation method disclosed by the invention is high in transparency; the particle size of the obtained nano calcium carbonate is small and uniform in distribution, and the particle diameter is 5-50 nm. The technology process is simple, the operation is easy, the repetitiveness is high, and the product stability is high.

The invention discloses microemulsion containing radix arnebiae extract, a preparation method and application thereof. The preparation method comprises the following steps: extracting fat-soluble components in radix arnebiae by a subcritical fluid extraction technology, then dispersing the obtained radix arnebiae extract in camellia oil and preparing into radix arnebiae oil; uniformly mixing the radix arnebiae oil with a dispersing agent, then adding water-in-oil type co-emulsifier and a water-in-oil type emulsifier, heating to 70-78 DEG C and preparing into an oil phase of the microemulsion;heating water to 65-75 DEG C and preparing into a water phase of the microemulsion; under a stirring condition, adding the water phase into the oil phase and obtaining the microemulsion containing theradix arnebiae extract. The microemulsion containing the radix arnebiae extract disclosed by the invention has the advantages of small particle diameter, good dispersity, high stability and long shelf life, and is suitable for being applied to cosmetics.

The present invention provides a water-in-oil microemulsion for hair treatment comprising: (a) an oil phase comprising: (i) a first oily component which is one or more glyceride fatty esters, and (ii) a second oily component which is one or more hydrocarbon oils of average carbon chain length less than 20 carbon atoms, and (b) a hydrophilic phase comprising: (i) water, (ii) a nonionic emulsifier which is an ethoxylated alcohol having an HLB of at least 6, and (iii) a hair conditioning agent.

The invention relates to a micro-emulsion fuel of straw stalk oil/water/diesel oil and a preparation method thereof. The micro-emulsion fuel of straw stalk oil/water/diesel oil comprises the following components according to the parts by weight: 5-20 parts of straw stalk oil, 15-30 parts of microemulsion and 50-80 parts of diesel oil; and all the components are mixed and stirred for dissolution to obtain pale yellow or chocolate brown microemulsion, and the average grain size of the liquid drop is 90-120 nm. The micro-emulsion fuel of straw stalk oil/water/diesel oil is stable water-in-oil type microemulsion, improves the thermal efficiency by 9.4 percent than that of the pure diesel oil as well as the oil saving ratio by 28.0 percent than that of the pure diesel oil and reduces the emissions of the harmful gases (CO, HC and NO(X)).