39results about "Sol preparation" patented technology

The present invention relates to a colloidal composition comprising unmodified, discrete cellulose microparticles, such as a colloidal emulsion or colloidal gel, a method of preparing the colloidal composition and uses of the colloidal composition and cellulose particles The colloidal composition comprises a continuous phase and a dispersed phase, wherein the continuous phase is a liquid; wherein the dispersed phase comprises cellulose microparticles which are dispersed in the continuous phase of the colloidal composition, wherein the cellulose microparticles have a mean average particle length of from 0.1 to 20 µm a mean average particle width from 0.05 to 1.3 µm, and a maximum thickness not exceeding 0.2 µm determined by scanning electron microscopy; and an aspect ratio of length / width of 1 to 25, and wherein the colloidal composition has a flow index n of ≤ 1 determined by a rheometer at NTP (normal temperature (25°C) and pressure (1 atm)).

The present invention relates to a method for synthesizing nanoparticles comprising or containing at least one zeolite nanocrystal, comprising: - preparing a first composition / solution 1 comprising an aluminum source and a source of alkali metal M, particularly Na ions; - preparing a second composition / solution 2 comprising a silicon source and a source of alkali metal M, particularly Na ions, wherein compositions / solutions 1 and 2 contain no organic structuring agents; - mixing the two compositions / solutions 1 and 2; - crystallizing the mixture; and - separating the nanoparticles thus formed. According to the present invention, both the first composition / solution 1 and the second composition / solution 2 comprise the sources and alkaline phosphate buffer (PBS). The present invention also relates to the obtained nanoparticles and compositions comprising them.

A modified metal oxide particle sol, when applied as a coating onto a substrate, is capable of having transparency, a high particle refractive index and good coat resistivity. The modified metal oxide particle sol is composed of modified metal oxide particles (iii) in which stannic oxide particles (i) having an average primary particle size of 4 to 50 nm serve as cores and are coated with metal oxide particles (ii) of at least one metal oxide selected from the group consisting of antimony oxide, stannic oxide and silicon oxide and having an average primary particle size of 1 to 10 nm, which modified metal oxide particles (iii) are dispersed in an organic solvent. The average primary particle size of the core particles (i) and the average primary particle size of the coating particles (ii) satisfy the relationshipsize of core particles(i)≥size of coating particles(ii),the ratio (total weight of metal oxides other than stannic oxide) / (weight of stannic oxide) is from 0.005 to 1.0, and the sol includes an amine (a) having a water solubility of 0.1 g / L or more and an amine (b) having a water solubility of less than 0.1 g / L.

The present invention relates to a method for synthesizing nanoparticles comprising or containing at least one zeolite nanocrystal, comprising: - preparing a first composition / solution 1 comprising an aluminum source and a source of alkali metal M, particularly K ions; - preparing a second composition / solution 2 comprising a silicon source and a source of alkali metal M, particularly K ions, wherein compositions / solutions 1 and 2 contain no organic structuring agents; - mixing the two compositions / solutions 1 and 2 together; - crystallizing the mixture; and - separating the nanoparticles thus formed. According to the present invention, both the first composition / solution 1 and the second composition / solution 2 consist of the sources and phosphate-buffered saline. The present invention also relates to a colloidal suspension of the obtained nanoparticles and a pharmaceutical composition containing the nanoparticles.

The invention relates to a biochar-loaded nano zero-valent iron repair material as well as a preparation method and application thereof. The biochar loaded nano zero-valent iron repair material is prepared from a persulfate-biochar carrier and metal sulfide modified composite acid stabilized nano zero-valent iron sol, the composite acid is composed of gallic acid and humic acid / fulvic acid; the preparation method comprises the following steps: S1, preparing a persulfate-biochar carrier; and S2, preparing the biochar loaded nano zero-valent iron repair material. The method is applied to groundwater chlorohydrocarbon pollution remediation. According to the method, in the reductive dechlorination process of the nano zero-valent reduced iron, released Fe < 2 + > can strengthen persulfate, Fe < 2 + > is regenerated by utilizing the reduction effect of gallic acid on reacted Fe < 3 + >, and catalytic circulation of iron is maintained; humic acid / fulvic acid is used for efficiently driving the degradation process; and metal sulfide is utilized to catalyze reduction of organic chlorine chemicals, so that the reductive dechlorination performance of the nano-iron material is improved, and the repairing effect of chlorinated hydrocarbon is optimized.

The invention concerns a composite structured nanomaterial comprising discrete, interconnected nanoparticles separated by and bound within a matrix material. These unique materials display optical properties that may be varied or tuned by altering their structural features. Also disclosed are simple, environmentally friendly methods to produce such structured nanomaterials, which do not require the use of harsh reducing agents or chemicals and so provide a green production route to un-contaminated and pure nanomaterials.

[Problem] To make it possible to disperse organic-modified nanoparticles even into solvents having a relatively large molecular weight and to increase the degree of freedom in solvent selection. [Solution] The present invention is a method for dispersing organic-modified nanoparticles into a solvent, and includes a dispersion step of dispersing organic-modified nanoparticles having organic modifying groups on the surface into a solvent. The solvent contains a poorly dispersible solvent that is poorly dispersible with respect to the organic-modified nanoparticles and a predetermined molecule. With respect to van der Waals volume, under the temperature and pressure in the dispersion treatment step the van der Waals volume of the predetermined molecule is smaller than that of the solvent and smaller than that of the organic modifying groups, and with respect to the dispersion term δD of the Hansen solubility parameters the absolute value of the difference between the value at the pressure of the organic-modified nanoparticles and the value of the predetermined molecule is 1.2 MPa1 / 2 or less, and the absolute value of the difference between the value at the pressure of the organic-modified nanoparticles and the value of the poorly dispersible mixed solvent containing the predetermined molecule is 1.2 MPa1 / 2 or less.

The present invention relates to colloidal silicon dioxide containing silicon dioxide particles with a small average secondary particle size and dispersion stability that can be maintained for extended periods even under strongly acidic conditions at a pH of 3 or less, and to a method for its preparation. The present invention relates to colloidal silicon dioxide comprising silicon dioxide particles, wherein the silicon dioxide particles have an average secondary particle size of 20 nm or less, as measured by dynamic light scattering, and a zeta potential of -20 mV or less, as measured at a pH of 3, and are surface-modified with a sulfonic acid group.

A method for preparing aluminum hydroxide dry powder and its sol, and its application, relates to the field of vaccine adjuvant preparation. The method includes: preparing an ammonia solution or sodium hydroxide solution; preparing an aluminum chloride solution; neutralizing the ammonia solution or sodium hydroxide solution with the aluminum chloride solution at 15-20°C to generate a milky white, translucent colloidal suspension; filtering; freeze-drying followed by aging to obtain aluminum hydroxide dry powder; adding the dry powder to a sodium chloride electrolyte solution, processing it in a high-speed shear disperser, redispersing the dry powder into a sol at a certain temperature, and homogenizing it cyclically in a high-pressure homogenizer to obtain aluminum hydroxide sol; removing electrolytes from the aluminum hydroxide sol using electrodialysis, followed by high-pressure sterilization and packaging. This invention solves the problems of clumping and sedimentation during sterilization and storage, poor stability, inconvenience in transportation and use, and limited concentration in existing aluminum hydroxide adjuvant preparation methods.

The invention provides a preparation method of special aluminum sol, and belongs to the technical field of aluminum products. The preparation method comprises the following steps: S1, mixing an aluminum source, a first acid regulating agent, a first structure-directing agent, a first valence dopant and water, and carrying out first reaction at a first temperature and a first pH value to obtain a pre-nucleation reaction solution; s2, adding a neutralizing agent, increasing the pH value to a second pH value, adding a second acid regulating agent and a second structure-directing agent into the system when the pH value reaches a preset trigger point, and then carrying out a second reaction at a second temperature and at the second pH value; s3, adding a second valence dopant into the system subjected to the second reaction, adjusting the pH value to a third pH value, and then aging; and S4, carrying out ultrasonic treatment to obtain the aluminum sol. The aluminum sol prepared by the invention can still keep good structural stability in a high-temperature environment, and shows unique application advantages in the fields of catalyst carriers, ceramic materials, coating additives and the like.

This disclosure relates to a glucose-sensing electrode including a nanoporous metal layer and a maltose-blocking layer formed over the nanoporous metal layer. The nanoporous metal layer is capable of oxidizing both glucose and maltose without an enzyme specific to glucose or maltose in the glucose-sensing electrode. The maltose-blocking layer has porosity that permits glucose to pass therethrough and inhibits maltose from passing therethrough toward the nanoporous metal layer.

The present application relates to wastewater treatment technical field, specifically to a kind of electrocatalysis enhanced method for degrading pollutants in nitrobenzene and phenol wastewater, comprising the following steps: S1, electrochemical system coupling two-phase anaerobic reactor, S2, pollutant degradation;The present application is a kind of processing method by combining electrochemistry and biotechnology, uses electrode as electron acceptor or donor, directional reinforcement microbial metabolic process, synchronous cracking two types of pollutants degradation inhibition, strengthen electron transfer efficiency and finally realize the efficient recovery of methane, can stably and efficiently realize the synergistic treatment and resource utilization of multiple pollutants, while reducing processing cost and environmental risk, it is a kind of efficient, economic, environmental protection nitrobenzene-containing wastewater and phenol-containing wastewater processing method.

A foamed colloidal silica binder having a total porosity of about 50% to about 95% by volume includes a synthetic, non-protein foaming agent mixed with colloidal silica and water. The foamed colloidal silica binder has sufficient durability and integrity to withstand the mixing with dry refractory ingredients to form a porous refractory composition, casting the refractory composition into a refractory shape, and drying the shape to form a porous refractory article having a porosity of about 25% to about 75% by volume. The resulting refractory articles have excellent high-temperature durability and insulating properties. A method of making the foamed colloidal silica binder is also provided.

comprising: providing a solid substrate; depositing a combination of vaporizable gold atoms and one or more organosulfur ligands on the surface of said substrate by physical vapour deposition (PVD) un

The present invention relates to a solution for producing a biodegradable coating, to a process for producing same, to a process for coating a substrate with the solution according to the invention, and to a coated article produced according to said process.

The present invention relates to a method for synthesizing nanoparticles consisting of or comprising at least one zeolite nanocrystal according to which: - a first composition / solution 1 containing an aluminum source and a source of an ion of an alkali metal M, in particular K, is prepared; a second composition / solution 2 comprising a silicon source and a source of an ion of an alkali metal M, in particular K, is prepared, said compositions / solutions 1 and 2 being free of any organic structuring agent; - the two compositions / solutions 1 and 2 are mixed; - the mixture is crystallized; and - said nanoparticles thus formed are optionally separated. According to the invention, said first composition / solution 1 and said second composition / solution 2 are both constituted of said source and of the aqueous saline phosphate buffer. The present invention also relates to colloidal suspensions of the nanoparticles obtained and to a pharmaceutical composition containing said nanoparticles.

A hafnium compound-containing sol-gel liquid contains an alcohol as a solvent and a hafnium compound as a hafnia source, in which the hafnium compound-containing sol-gel liquid contains one or two or more elements M selected from the group consisting of Zr, Ti, and Nb, a mass ratio WM / WHf of a content WM of the elements M to a content WHf of Hf as a metal component is within a range of 0.2% or more and 5.0% or less. A hafnia-containing film containing hafnia (HfO2) and one or two or more elements M selected from the group consisting of Zr, Ti, and Nb, and in which a mass ratio WM / WHfO2 of a content WM of the elements M to a content WHfO2 of the HfO2 is within a range of 0.05% or more and 5.0% or less.

The present disclosure describes methods of producing colloids of precise sizes and shapes using temperature responsive block copolymers. A method of precise size control of colloids may include producing colloids in a solution of block copolymers, and POSS colloids. The temperature of the solution may be increased at a set rate to swell mesoscopic droplets to a precise size. A method of precise shape control of colloids may include polymerizing colloids in a solution of block copolymers, and POSS colloids and manipulating the temperature of the solution. In particular, the temperature of the solution may be increased at a set rate to swell and polymerize mesoscopic droplets and subsequently decreased at a set rate to collapse the colloids into a precise shape.

Provided are: colloidal silica which has a small average secondary particle diameter of silica particles and is capable of maintaining the dispersion stability of the silica particles for a long period of time even under strongly acidic conditions at pH 3; and a method for producing the colloidal silica. The present invention provides colloidal silica containing silica particles, which is characterized in that the silica particles have an average secondary particle diameter of 20 nm or less as measured by a dynamic light scattering method and a Zeta potential of-20 mV or less as measured under pH 3 conditions, and the surfaces of the silica particles are modified with sulfonic acid groups.

A porous sintered metal body and a method for preparing a porous sintered metal body by additive manufacturing are provided. The method involves a layering process in which multiple layers of a consolidated feedstock containing metal particles dispersed in a solid polymer are individually and sequentially formed, with the resulting porous sintered metal body comprising (or consisting of, or consisting essentially of) a solid (e.g., rigid or semi-rigid) matrix of fused and thereby interconnected metal particles.

A chain-like colloidal silica particle dispersion sol (16) is formed by dispersing a group of colloidal silica particles, observed using a field emission scanning electron microscope, consisting of 4 to 300 spherical primary particles linked in a chain and having an average length of 35 nm to 1800 nm, in a mixed solvent (11) of pure water and an organic solvent. The average particle size of the spherical primary particles is 6 nm to 20 nm, and the average aspect ratio of the spherical primary particles is in the range of 1.0 to 1.3. The organic solvent is an alcohol with 1 to 4 carbon atoms or a water-soluble diol compound with 2 to 4 carbon atoms. The content of K, Na, or NH3 impurities in each colloidal silica particle is less than 3500 ppm by mass, and the content of alkaline earth metals or aluminum impurities is less than 1 ppm by mass.

A two-step process is provided for forming large photonic single crystals of about 0.1 millimeter and greater via DNA coated colloidal particles. The two-step process generally include decoupling the nucleation and growth steps. In particular, DNA colloidal particles are partitioned in nanoliter droplets formed in a water in oil emulsion using microfluidics. Once a crystal nucleates within a droplet, depletion of particles occurs as the crystal grows inhibit formation of more crystals within the droplet. A small number of droplets containing these seed crystals are then mixed with droplets containing weak DNA coated colloidal particles. The emulsion is then broken and heated at a temperature effective to cause dissociation of the weak particles while the seeds remain stable. The system is further cooled at a temperature effective that the particles stably adhere to the seed crystals resulting in growth while inhibiting nucleation of new crystals.

The present invention relates to a solution for producing a biodegradable coating, a method for producing it, a method for coating a substrate with the solution according to the invention, and a coated object produced therewith.

The invention relates to a method for concentrating of colloidal solutions of noble metals, comprising adding a compound based on a cross-linked polymer with 3D structure in the form of hydrogel to a colloidal solution of a noble metal.

A zirconia sol that has a particle diameter D50 of 50 nm to 250 nm and a proportion X of at least 40% is obtained by the following procedure. (Procedure) A transmission electron microscope image that includes at least 20 isolated particles is obtained. The following operations (1) through (5) are performed on each of the isolated particles. (1) A circumscribed circle and an inscribed circle having the same center as the circumscribed circle are obtained. (2) The ratio of the diameter of the obtained circumscribed circle and the diameter of the obtained inscribed circle is determined. (3) The ratio is determined for all of the isolated particles in the transmission electron microscope image. (4) The number of isolated particles A where the ratio is at least 2.0 is counted. (5) The proportion X of the number of isolated particles A to the total number of isolated particles is determined.

A modified metal oxide particle sol, when applied as a coating onto a substrate, is capable of having transparency, a high particle refractive index and good coat resistivity. The modified metal oxide particle sol is composed of modified metal oxide particles (iii) in which stannic oxide particles (i) having an average primary particle size of 4 to 50 nm serve as cores and are coated with metal oxide particles (ii) of at least one metal oxide selected from the group consisting of antimony oxide, stannic oxide and silicon oxide and having an average primary particle size of 1 to 10 nm, which modified metal oxide particles (iii) are dispersed in an organic solvent. The average primary particle size of the core particles (i) and the average primary particle size of the coating particles (ii) satisfy the relationship sizeofcoreparticles(i)≥sizeofcoatingparticles(ii), the ratio (total weight of metal oxides other than stannic oxide) / (weight of stannic oxide) is from 0.005 to 1.0, and the sol includes an amine (a) having a water solubility of 0.1 g / L or more and an amine (b) having a water solubility of less than 0.1 g / L.

A method comprising providing a sol comprising a solvent; contacting the sol with a precipitation initiator to initiate precipitation of the sol, wherein the precipitation initiator is different to the solvent; and applying the precipitating sol to a product. The methods of the invention may be used with sols comprising a solvent, a metal alkoxide, and optionally a biopolymer and / or a catalyst, with alkoxides comprising metals, organically modified alkoxides comprising metals, alkoxides comprising metalloids, and organically modified alkoxides comprising metalloids all being encompassed by the term ‘metal alkoxide’. Also disclosed is an apparatus for use in the method comprising a first storage vessel; a second storage vessel; one or more pumps; and one or more delivery means.

The invention discloses a preparation method of high-purity neutral flaky aluminum sol. The method adopts a specific composite organic acid as a dispersing agent, and comprises the following steps: (1) uniformly mixing and stirring pseudo-boehmite, the composite organic acid dispersing agent and a solvent, and heating and stirring under a heat preservation condition to obtain crude aluminum sol; (2) drying the crude aluminum sol in a spray drying manner to obtain dry gel; and (3) uniformly mixing the xerogel with a solvent, stirring under a heat preservation condition, and centrifugally removing impurities to obtain the aluminum sol. According to the preparation method, the malic acid and citric acid composite organic acid is adopted as the dispersing agent, and compared with a common inorganic acid dispersing agent in the prior art, the acid content of the aluminum sol is effectively reduced, so that the pH value of the product reaches a neutral range, and corrosion to equipment and pollution to the environment are reduced. The prepared aluminum sol is high in purity (greater than or equal to 99.5%), colloidal particles of the aluminum sol are of a regular sheet structure, the fluidity can be kept for more than 3 months at room temperature, and the problem of poor stability of the existing high-concentration aluminum sol is solved.

The present invention discloses a method for producing amorphous solid dispersions in a nanoparticulate form, through solvent controlled co-precipitation, using microfluidization / microreaction technology to promote high energy mixing / interaction at a micro and / or molecular level between the streams involved in the process. Feed streams, solvent and anti-solvent, are fed to an intensifier pump at individually controlled rates and forced to interact to micro-and / or nano-scale within a microreactor. The present invention also discloses amorphous solid dispersions obtained by the method of the invention as well as pharmaceutical compositions containing the same.

The present invention relates to a method for synthesizing nanoparticles consisting of or comprising at least one zeolite nanocrystal according to which: - a first composition / solution 1 containing an aluminum source and a source of an ion of an alkali metal M, in particular Na, is prepared; a second composition / solution 2 comprising a silicon source and a source of an ion of an alkali metal M, in particular Na, is prepared, said solutions 1 and 2 being free of any organic structuring agent; - the two compositions / solutions 1 and 2 are mixed; - the mixture is crystallized; and - said nanoparticles thus formed are optionally separated. According to the invention, said first composition / solution 1 and said second composition / solution 2 are both constituted of said source and of an alkaline phosphate buffer (PBS). The present invention also relates to the nanoparticles obtained and compositions containing them.