859results about "Gel preparation" patented technology

Methods of ex situ synthesis of graphene, graphene oxide, reduced graphene oxide, other graphene derivative structures and nanoparticles useful as polishing agents are disclosed. Compositions and methods for polishing, hardening, protecting, adding longevity to, and lubricating moving and stationary parts in devices and systems, including, but not limited to, engines, turbos, turbines, tracks, races, wheels, bearings, gear systems, armor, heat shields, and other physical and mechanical systems employing machined interacting hard surfaces through the use of nano-polishing agents formed in situ from lubricating compositions and, in some cases, ex situ and their various uses are also disclosed.

The invention provides fabricated hydrogels, hydrogel particles, hydrogel containing compositions, and methods of making the same. The invention also provides methods of implanting, injecting, or administering the hydrogels, hydrogel particles, or the hydrogel containing compositions to treat a subject in need. Methods of crosslinking pre-solidified or pre-gelled hydrogel particles and making crosslinked hydrogels, crosslinked hydrogel particles, and crosslinked hydrogel containing compositions also are disclosed herein.

A gel film or an isolated gel film comprising sheets of graphene or chemically converted graphene at least partially separated by a dispersion medium, such as water, and arranged in a substantially planar manner to form an electrically conductive matrix.

A cosmetic and/or pharmaceutical composition containing: (a) an oil component; (b) a viscosity modifier selected from the group consisting of a C6-22 hydroxyfatty acid, a salt of a C6-22 hydroxyfatty acid, and mixtures thereof; and (c) water.

The invention relates to a microflow droplet technology-based method for one-step continuous preparation of multi-chamber calcium alginate microgel for immobilization of bioactive substances. The method realizes high-throughput continuous production of a microgel material. The method comprises forming a parallel and stable flow field through different hydrogel prepolymer solutions in a microfluidic channel, pouring the hydrogel prepolymer solutions for forming different chambers of the microgel into a microfluidic chip to form water phase solutions of multiple phase parallel fluids, mixing thewater phase solutions and an immiscible fluid (oil phase) through a T-shaped channel or a fluid focusing design to obtain water-in-oil emulsion drops and then alginic acid in the drops is linked immediately so that multi-chamber microgel is prepared, and cleaning the emulsion drops on the microfluidic chip so that the microgel is fast conveyed into a water phase. The method realizes one-step preparation of the calcium alginate microgel immobilized with bioactive substances and is suitable for industrial application.

The present invention is related to glucose sensors that are capable of detecting the concentration or level of glucose in a solution or fluid having either low or high ionic strength. The glucose sensors of the present invention comprise a polymerized crystalline colloidal array (PCCA) and a molecular recognition component capable of responding to glucose. The molecular recognition component may be a boronic acid, such as a phenylboronic acid, glucose oxidase, a combination of phenylboronic acid and poly(ethylene)glycol or crown ether, or another component capable of detecting glucose in various fluids and solutions. The glucose sensors of the present invention may be useful in the development of noninvasive or minimally invasive in vivo glucose sensors for patients having diabetes mellitus.

Disclosed is a clear, crosslinked, polymeric gel composition that is the reaction product of a microemulsion containing (a) from 1-70 wt. %, preferably from 1-40 wt. %, and more preferably from 10-25 wt. % of an anhydride functionalized polymer, (b) from 0.1-40 wt. %, preferably from 0.1-20 wt. %, and most preferably from 0.5-5 wt. % of a cross-linking agent, (c) from 0.01-50 wt. %, preferably from 0.1-20 wt. %, and more preferably from 0.5-10 wt. % surfactant, (d) from 0.01-30 wt. %, preferably from 0.1-10 wt. %, and more preferably from 0.1-5 wt. % water, and (e) from 10.0-95.0 wt. % of a hydrophobic liquid, based on the total weight of the polymeric gel composition. The gel composition is prepared by combining the anhydride functionalized polymer, the cross-linking agent, the surfactant, the water, and the hydrophobic liquid-form a microemulsion and then gelling the microemulsion.

A sol-gel poly-THF coating was developed for high-performance capillary microextraction to facilitate ultra-trace analysis of polar and nonpolar organic compounds. Parts per quadrillion level detection limits were achieved using Poly-THF coated microextraction capillaries in conjunction with GC-FID. Sol-gel Poly-THF coatings showed extraordinarily high sorption efficiency for both polar and nonpolar compounds, and proved to be highly effective in providing simultaneous extraction of nonpolar, moderately polar, and highly polar analytes from aqueous media. Sol-gel poly-THF coated microextraction capillaries showed excellent thermal and solvent stability, making them very suitable for hyphenation with both gas-phase and liquid-phase separation techniques, including GC, HPLC, and CEC. In CME-HPLC and CME-CEC hyphenations, sol-gel poly-THF coated microextraction capillaries have the potential to provide new levels of detection sensitivity in liquid-phase trace analysis, and to extend the analytical scope of CME to thermally labile-, high molecular weight-, and other types of compounds that are not amenable to GC.

The present invention provides supramolecular hydrogels having a three-dimensional, self-assembling, elastic, network structure comprising non-polymeric, functional molecules and a liquid medium, whereby the functional molecules are noncovalently crosslinked. The functional molecules may be, for instance, anti-inflammatory molecules, antibiotics, metal chelators, anticancer agents, small peptides, surface-modified nanoparticles, or a combination thereof. Applications of the present invention include use of the supramolecular hydrogel, for instance, as a biomaterial for wound healing, tissue engineering, drug delivery, and drug/inhibitor screening.

Methods of making a high gel strength, water-dispersible, stabilizing colloidal microcrystalline cellulose composition are disclosed. This stabilizer composition is useful in many food and non-food applications.

The present invention relates to a control release gel for delivery of additives free of producing ash to substantially free of producing ash into a lubricant. Further, the invention provides for a method of controlled release of additive(s) into the lubricant.

The invention discloses flexible boron nitride nano-belt aerogel and a preparation method therefor. The flexible boron nitride nano-belt aerogel has a communicating three-dimensional porous network structure, wherein the three-dimensional porous network structure is formed through interwinding and lapping boron nitride nano-belts and is made of macropores with a pore size greater than 50nm, mesopores with a pore size of 2nm to 50nm and micropores with a pore size smaller than 2nm. The preparation method comprises the steps of subjecting boric acid and a nitrogen-containing precursor to high-temperature digestion so as to form a transparent precursor solution, then, preparing precursor aquagel, and then, carrying out drying and high-temperature pyrolysis, thereby obtaining the flexible boron nitride nano-belt aerogel. The boron nitride nano-belt aerogel disclosed by the invention has excellent flexibility and elasticity restorability, can bear outside loads of different forms in a widetemperature range and is restorable in elasticity; and the preparation process is mild in reaction conditions, easy in operation and low in cost, is concise, environmentally friendly and pollution-free and can achieve continuous production.

Provided herein are methods utilizing microfluidics for the oxygen-controlled generation of microparticles and hydrogels having controlled microparticle sizes and size distributions and products from provided methods. The included methods provide the generation of microparticles by polymerizing an aqueous solution dispersed in a non-aqueous continuous phase in an oxygen-controlled environment. The process allows for control of size of the size of the aqueous droplets and, thus, control of the size of the generated microparticles which may be used in biological applications.

The invention discloses gelators PC5 based on naphthalimide functionalized pillar[5]arene. Organic supramolecular gel PC5G with yellow aggregate state induced fluorescence can be formed by the gelators in a cyclohexanol solution under the external-wall pi-pi action. When Fe<3+> is added to PC5G, Fe<3+> can produce cation-pi action with naphthalimide, and the external-wall pi-pi action between thegelators is damaged, as a result, fluorescence of PC5G is quenched; when H2PO4<-> is added to metallogel PC5-FeG after fluorescence quenching, H2PO4<-> and Fe<3+> are complexed, the external-wall pi-pi action of PC5G is restored again, and aggregate state induced fluorescence appears again, so that continuous reversible supersensitive detection for Fe<3+> and H2PO4<-> is realized. Besides, the organic supramolecular gel PC5G can remove Fe<3+> from an aqueous solution very well, and removal rate is up to 99.42%.

The invention discloses acetal-substituted glucosamide, a preparation method and a method for preparing a supramolecular gel. The acetal-substituted glucosamide is as shown in formula I (as shown in Specification), wherein n is selected from 1-10, 12, 14, 16 or 18. The supramolecular gel formed from the acetal-substituted glucosamide disclosed by the invention in a solution is thixotropic, high in recovery rate and controllable. The gel factors are capable of achieving oil and water separation, dye wastewater purification and the like. The supramolecular gel can be used for preparing coatings, ink and lubricants.

The invention provides polymer gel particles, a preparation method thereof, composite gel particles containing the polymer gel particles and an application of the composite gel particles. The Young modulus of the polymer gel particles is 5-5000Pa, the average particle size is 100nm-100[mu]m, the polydispersity index is less than 0.5, and an organic solvent is not contained. The polymer gel particles are obtained by the following steps: performing cross-linking on a polymer aqueous solution to form a hydrogel with a Young modulus of 5-5000Pa, then performing preliminary crushing and refining onthe hydrogel, and using a fluid shearing method to prepare the polymer gel particles. The composite gel particles include the above polymer gel particles, and a functional substance supported on thepolymer gel particles. According to the method provided by the invention, organic solvents or surfactants are not used in the process of preparing the polymer gel particles, the obtained polymer gel particles are safe and reliable, the particle size is controllable in the range from the nanometer to the micrometer, the particle sizes are uniform, and the prepared composite gel particles can be used in the fields of biomedicines and the like.

The present invention relates to a method for preparing a natural or synthetic polymer hydrogel loading graphene oxide or graphene, and to the selective and high-capacity adsorption and loading of the hydrogel with respect to a low-molecular weight material or a high-molecular weight material. More specifically, an alginate or polyacrylamide hydrogel loading graphene and a graphene derivative is prepared, wherein the hydrogel can be controlled to enable selective absorption according to the characteristics of an adsorbate by adjusting the reduction degree of graphene oxide, exhibits high adsorption capacity, and is easy to handle as a hydrate. These characteristics can significantly improve the adsorption efficiency with respect to a material in water or an organic phase material, compared with existing hydrogels.

The invention discloses a hydrogel type enzyme catalytic material which contains protease-inorganic hybrid nanoflower and is prepared through secondary immobilization synthesis, and a preparation method and applications thereof. According to the preparation method, protease is taken as an organic component, and is subjected to self-assembling with inorganic metal ions so as to obtain the protease-inorganic hybrid nanoflower; the protease-inorganic hybrid nanoflower is embedded with a gel carrier system which is excellent in biocompatibility and contains at least two hydrophilic polymers, repeat freezing-unfreezing method is adopted to obtain the hydrogel containing protease-inorganic hybrid nanoflower. The unique tridimensional network of the hydrogel containing protease-inorganic hybrid nanoflower is capable of realizing stable existing of enzymes in a catalytic system, and secondary immobilization is achieved. According to the preparation method, secondary immobilization is adopted,so that protease is protected from external environment influences, enzyme stability is improved, enzyme reusability is improved. Separation of the catalytic material with reactants is not necessary,so that a step of separation of enzymes with substrates is avoided, and the application prospect in the field of enzyme immobilization is promising.

The present invention relates to a carbon aerogel precursor, a preparation method thereof and a carbon aerogel prepared thereby and, more particularly, to a carbon aerogel precursor which can be converted into a carbon aerogel that exhibits excellent specific surface area and physical properties by using a binder that has a low carbonization ratio and is capable of performing phase conversion while using a carbon material having physical properties such as diameter, length and the like that are not adjusted, a preparation method thereof, and a carbon aerogel prepared thereby.

The present invention relates to and uses, in order to prevent crude oil from “congealing” in a transportation line, a controlled-crosslinking thermal insulation gel, i.e. relatively fluid at the start and developing in-situ gelation in lines only under certain conditions, temperature conditions among other things. In order to obtain controlled crosslinking, it is possible to carry out 1) Physical crosslinkings, i.e. physical bonds between polymers—completely reversible bonds by thermal effect and/or mechanical shear—and 2) Chemical crosslinkings: monomers or polymers having functions allowing chemical bonds to be established between polymers.

Disclosed are: a composition which enables the more effective development of the efficacy of a water-soluble drug in a solution containing the drug; and a dispersion in which a hydrophobic drug can be dispersed stably without requiring the use of any surfactant. Specifically disclosed are: a composition comprising ultra-fine bubbles having a mode particle size of 500 nm or less, a drug and water; and a process for producing a composition comprising ultra-fine bubbles having a mode particle size of 500 nm or less, a drug and water, which utilizes an ultra-fine bubble generation apparatus.