121 results about "Nanosized particle" patented technology

Polymeric nanofibers have been developed which are useful in a variety of medical and other applications, such as filtration devices, medical prosthesis, scaffolds for tissue engineering, wound dressings, controlled drug delivery systems, cosmetic skin masks, and protective clothing. These can be formed of any of a variety of different polymers, either non-degradable or degradable. In a preferred embodiment demonstrated in the following examples, nanofibers are formed of biodegradable and non biodegradable polyphosphazenes, their blends with other polyphosphazenes or with organic, inorganic / organometallic polymers as well as composite nanofibers of polyphosphazenes with nanosized particles such as hydroxyapatites.

The invention provides homogeneous small spherical particles of low molecular weight organic molecules, said small spherical particles having a uniform shape, a narrow size distribution and average diameter of 0.01-200 μm. The invention further provides methods of preparation and methods of use of the small spherical particles. These small spherical particles are suitable for applications that require delivery of micron-size or nanosized particles with uniform size and good aerodynamic or flow characteristics. Pulmonary, intravenous, and other means of administration are among the delivery routes that may benefit from these small spherical particles.

A method for producing isolatable and dispersible graphene sheets, wherein the graphene sheets may be tailored to be soluble in aqueous, non-aqueous or semi-aqueous solutions. The water soluble graphene sheets may be used to produce a metal nanoparticle-graphene composite having a specific surface area that is 20 times greater than aggregated graphene sheets. Graphene sheets that are soluble in organic solvents may be used to make graphene-polymer composites.

Polymeric nanofibers have been developed which are useful in a variety of medical and other applications, such as filtration devices, medical prosthesis, scaffolds for tissue engineering, wound dressings, controlled drug delivery systems, cosmetic skin masks, and protective clothing. These can be formed of any of a variety of different polymers, either non-degradable or degradable. In a preferred embodiment demonstrated in the following examples, nanofibers are formed of biodegradable and non biodegradable polyphosphazenes, their blends with other polyphosphazenes or with organic, inorganic / organometallic polymers as well as composite nanofibers of polyphosphazenes with nanosized particles such as hydroxyapatites.

Methods and apparatuses to produce graphene and nanoparticle catalysts supported on graphene without the use of reducing agents, and with the concomitant production of heat, are provided. The methods and apparatuses employ radiant energy to reduce (deoxygenate) graphite oxide (GO) to graphene, or to reduce a mixture of GO plus one or more metals to to produce nanoparticle catalysts supported on graphene. Methods and systems to generate and utilize heat that is produced by irradiating GO, graphene and their metal and semiconductor nanocomposites with visible, infrared and / or ultraviolet radiation, e.g. using sunlight, lasers, etc. are also provided.

A lubricant composition is disclosed that comprises: (a) a lubricant and (b) at least one molybdenum-containing compound in the form of surface-capped nanosized particles of the general formula: (Z)n(X—R)m wherein Z is an inorganic moiety comprising molybdenum and sulfur in the form of particles having dimensions in the range of from about 1 to about 100 nm; (X—R) is a surface-capping reagent wherein R is a C4 to C20 straight or branched-chain alkyl or alkylated cycloalkyl radical or radicals and X is a functional group capable of specific sorption and / or chemical interaction with molybdenum / sulfur moiety; n is the number of molecules of Z in the particles; m is an integer representing the amount of surface-capping reagents relative to a single particle; and the ratio of m to n is in the range of from about 1:1 to about 10:1.

A lubricant composition is disclosed that comprises: (a) a lubricant and (b) at least one molybdenum-containing compound in the form of surface-capped nanosized particles of the general formula: (Z)n(X—R)m wherein Z is an inorganic moiety comprising molybdenum and sulfur in the form of particles having dimensions in the range of from about 1 to about 100 nm; (X—R) is a surface-capping reagent wherein R is a C4 to C20 straight or branched-chain alkyl or alkylated cycloalkyl radical or radicals and X is a functional group capable of specific sorption and / or chemical interaction with molybdenum / sulfur moiety; n is the number of molecules of Z in the particles; m is an integer representing the amount of surface-capping reagents relative to a single particle; and the ratio of m to n is in the range of from about 1:1 to about 10:1.

Seals and sealing members are formed from a composition generally comprising a first elastomeric material and a second elastomeric material, wherein the second elastomeric material comprises a dispersion of nanosized particles disposed within a polymer matrix of the second elastomeric material. Preferred first and second elastomeric materials are fluoroelastomers, and preferred nanosized particles are fluoropolymers. The nanosized particles are sized less than about 100 nm. The composition comprises about 0.2 to 65 percent by weight of first elastomeric material, about 20 to 95 percent by weight of second elastomeric material, and about 10 to 90 percent by weight particles based on the total weight of the particles and the second elastomeric material. The composition can be used to form annular O-ring seals placed within rotary cone bits used for drilling subterranean formations, and can be used to form a selected portion of the seal or the entire seal.

The present invention relates to an article having at least one surface, wherein said surface is at least partially coated with a ultra high hydrophobic film having a surface roughness such that the film exhibits a static water contact angle at least equal to 115°, preferably 120°, even better 125°, and wherein said film is a nanostructured film comprising a first layer comprising nanoparticles bound by at least one binder adhering to the surface of the article, and a second layer of an anti-fouling top coat at least partially coating said first layer. The present invention also concerns a process for preparing the above article.

Combining nanosized particles of a source of desired dental restorative, repair or therapeutic materials with strengthening agents in various generally nanosized form such as whiskers, fibers, particles and the like in a resin matrix provides a highly strain resistant composite which more effectively releases the therapeutic agents. The utilization of nano sized particles of the therapeutic agent in the combination enables observation of significantly improved therapeutic results.

A method of making multilayer electronic devices, such as capacitors and varistors, is provided, wherein nanosized particles are assembled into a densely packed thin film on a dielectric substrate, and then sintered to form an electrode less than about 700 nm in thickness.

The invention discloses a functionalized grapheme / superparamagnetic ferroferric oxide nano particle composite material and a preparation method of the functionalized grapheme / superparamagnetic ferroferric oxide nano particle composite material, and belongs to the technical field of grapheme magnetic composite materials. The functionalized grapheme / superparamagnetic ferroferric oxide nano particle composite material solves the technical problems that a grapheme / superparamagnetic ferroferric oxide nano particle composite material is poor in hydrophilia and can not modify a functional group easily in the prior art. According to the composite material, superparamagnetic ferroferric oxide nano particles are loaded on the surface of functionalized grapheme, the diameter of the particles is smaller than 30nm, and the functionalized grapheme is polyacrylamide functionalized grapheme, or polyacrylic acid functionalized grapheme, or polymine functionalized grapheme, or tween-20 functionalized grapheme. Not only is the diameter of the particles smaller than 30nm, but also the composite material has the superparamagnetic characteristic and the strong external magnetic field correspondence, can be dispersed in a water solution excellently, and can further modify biological giant molecules.

A method and apparatus that produces highly ordered, nanosized particle arrays on various substrates. These regular arrays may be used as masks to deposit and grow other nanoscale materials.

The invention provides a composite gold nanorod carrier having photo-thermal / photodynamic therapy treatment performance and a preparation method thereof. The composite gold nanorod carrier uses a gold nanorod as a core and uses silicon dioxide as a shell layer, a near infrared fluorescent dye for photodynamic therapy is modified on the outer surface of the shell layer. The preparation method comprises the steps that a chloroauric acid solution and a cetyl trimethyl ammonium bromide solution are mixed, a sodium borohydride ice water mixed solution is added to obtain a nano gold seed solution A; a silver nitrate solution and a chloroauric acid solution are added to a binary surface active agent solution, a hydrochloric acid is added after reaction to obtain a solution B, then ascorbic acid and the solution A are added, and a gold nanorod is obtained after reaction; a tetraethoxysilane methanol solution and an aminopropyl trimethoxy silane methanol solution are added to a gold nanorod solution to obtain composite nanoparticles; 1-(3-dimethyl amino propyl)-3-ethyl carbodiimide hydrochloride is added to the near infrared fluorescent dye, then N-hydroxyl succinimide is added to obtain a solution C; the composite nanoparticle solution is mixed with the solution C to obtain a product.

The invention discloses a method for preparing super-hydrophobic sponges. The method includes steps of coating poly-dopamine on the surfaces of melamine resin sponges; modifying the surfaces of the poly-dopamine by the aid of poly-dopamine nano-particles combined with mercapto long-chain alkane so as to obtain the super-hydrophobic sponges. The number of carbon atoms of the mercapto long-chain alkane is 6-18. The method has the advantages that the super-hydrophobic sponges can be prepared by the aid of the two-step method, and nano-particle modification layers are arranged on the surfaces of the super-hydrophobic sponges and are high in coverage and loading capacity; the super-hydrophobic sponges are excellent in acid resistance and alkali resistance, good in foldability and reusability and high in oil adsorption; the poly-dopamine required by the method is low in concentration, accordingly, the manufacturing cost can be saved, and the method is simple and convenient and is applicable to mass production.

Compounds and methods are disclosed in which a prodrug can be delivered in an elevated oxidative state to cells by means of graphitic nanoparticles to which the prodrug is attached by a hydrophilic polymer and which have been made soluble by a hydrophilic polymer, such as PEG. The graphitic nanoparticle may be a single walled carbon nanotube (SWNT). The prodrug may be a DNA-binding metal-based drug. Exemplified is a platinum(IV) complex c,c,t-[Pt(NH3)2Cl2(OEt)(O2CCH2CH2CO2H)], which is nearly nontoxic to testicular cancer cells, but displays a significantly enhanced cytotoxicity profile when attached to the surface of amine-functionalized soluble SWNTs. An amine functionality on the hydrophilic polymer may be used to link the prodrug.

The present invention provides silver oxide particles having an average diameter of less than or equal to 100 nm that are stable and can be transported in dry powder form. The surface of the silver oxide particles is coated with an extremely thin layer of a surfactant such as fatty acid. Nanosized silver oxide particles according to the invention are preferably formed via the addition of a strong base to a mixture including an aqueous silver salt solution and a surfactant dissolved in an organic solvent that is at least partially water miscible. The strong base causes silver oxide to precipitate from the mixture as nanosized particles, which are immediately encapsulated by the surfactant and thus protected from further crystal growth and Ostwald ripening. The nanosized surfactant coated particles of silver oxide can be washed and dried and then transported in dry form.

The invention relates to the field of nano materials and discloses a preparation method of a water-soluble ferroferric oxide magnetic nanoparticle with functional amidogen, comprising the following steps of: coordinating carboxyl on n-(1,3-dioxoisoindolin-2-yl) alkyl acid (n is equal to 3-18) with ferrum; pyrolyzing a precursor of n-(1,3-dioxoisoindolin-2-yl) alkyl acid iron at high temperature to obtain an oil-soluble magnetic nanoparticle with lipophilicity and a surface ligand, i.e. the n-(1,3-dioxoisoindolin-2-yl) alkyl acid; then removing phthalic anhydride for protecting amino by a deammoniation protective reagent (hydrazine hydrate) by using a deammoniation protection method, and converting the oil-soluble magnetic nanoparticle into the water-soluble ferroferric oxide magnetic nanoparticle with functional amidogen. The water-soluble ferroferric oxide magnetic nanoparticle with functional amidogen can be excellently dissolved in a water solution and has favorable biocompatibility and paramagnetism.

The invention relates to a method of obtaining micro- and nanometric polymeric particles in a controlled, reproducible manner. The aforementioned particles have a spherical shape and a very narrow, uniform size distribution. The invention comprises the use of an easy particle-forming method consisting in using hydrodynamic forces to focus a composite microjet formed by two concentric fluids and can be used in the encapsulation of fragile compounds of biological interest, from peptides and proteins to cells and micro-organisms.

A nanosized particle has a first phase that is a simple substance or a solid solution of element A, which is Si, Sn, Al, Pb, Sb, Bi, Ge, In or Zn, and a second phase that is a compound of element D, which is Fe, Co, Ni, Ca, Sc, Ti, V, Cr, Mn, Sr, Y, Zr, Nb, Mo, Ru, Rh, Ba, lanthanoid elements (not including Ce and Pm), Hf, Ta, W or Ir, and element A, or a compound of element A and element M, which is Cu, Ag, or Au. The first phase and second phase are bound via an interface, and are exposed to the outer surface. The surface of the first phase other than the interface is approximately spherical. Furthermore, a lithium ion secondary battery includes the nanosized particle as an anode active material.

The present invention provides hydrophilic dispersions comprising nanoparticles of inclusion complexes consisting essentially of nanosized particles of a macromolecule wrapped in an amphiphilic polymer such that non-valent bonds are formed between the macromolecule and the amphiphilic polymer. The macromolecules may be a naturally-occurring, synthetic or recombinant polypeptide, protein, polysaccharide or polynucleotide, and the amphiphilic polymer is a polysaccharide or a modified polysaccharide such as starch, chitosan or an alginate.

There is disclosed a nanoparticulate dispersion of a silver carboxylate particles having on the surface of the particles a surface modifier which is a nonionic oligomeric surfactant based on vinyl polymer with an amido function. In particular, the surface modifier is acrylamide, methacrylamide or derivatives thereof. Also disclosed are various compositions including the dispersions including oxidation-reduction imaging forming compositions, thermographic elements and photothermographic compositions and elements. The preferred carboxylate is a silver salt of a long chain fatty acid such as silver behenate.

The present invention discloses stable, non-agglomerated, ultra-small metal / alloy clusters encapsulated in silica with the metal / alloy cluster size of less than 5 nm. The invention further discloses a simple, cost effective process for the preparation of metal / alloy clusters encapsulated in silica which is thermally stable and without agglomeration.

Oxide, oxysulfide, halide or phosphate host particles with a self-assembled organophosphonate monolayer covalently bonded thereto. Methods for coating the host particles and use of rare earth ion-doped particles in imaging methods and photodynamic therapy methods are also disclosed.

The invention discloses a Fe3O4-Au magnetic nano composite material, and a preparation method and an application thereof. The preparation method of the Fe3O4-Au magnetic nano composite material comprises the following steps: preparing oil-phase Fe3O4 nano particles; taking 2,3-dimercaptosuccinic acid as a phase transfer modifier, thus obtaining water-soluble Fe3O4 nano particles; and adding a reducing agent and taking chloroauric acid as the raw material to synthesize the Fe3O4-Au magnetic nano composite material through one step in the aqueous solution of Fe3O4. The preparation method is characterized in that small-particle size gold nano particles can be generated on the surface of the Fe3O4 transformed into the water phase from the oil phase through one step, the gold nano particles do not need to be extra synthesized and purified, and therefore, the experiment step is simplified and the particles obtained are even in size. In the meantime, the Fe3O4-Au magnetic nano composite material obtained by the preparation method can be applied to catalysis, biological detection, cell separation and targeted drug delivery.

A blood-pressure sensor is constituted of an elastic body which is fitted to a blood-vessel outer wall, and a shape of which is deformed by force generated by pulsing motion of expansion and contraction of the blood vessel, and a plurality of nanosized particles dispersedly provided in the elastic body, and when the force is applied to the sensor in a state where the sensor is irradiated with light, the magnitude of the force is measured on the basis of intensity of scattered light from the particles or emission intensity of fluorescence from the particles, the intensity of the scattered light or emission intensity of the fluorescence corresponding to a change in distance between the particles.

The invention discloses spherical atomized aluminum-zinc amorphous alloy powder and a preparation method thereof. An aluminum particle undergoing thermal self-explosion and becoming a particle with ananoscale during combustion is designed and prepared, the combustion rate of the aluminum particle is increased, and thus the energy release rates of aluminiferous explosives, pyrotechnic compositionsand other objects are greatly increased. The melting points and the boiling points of two types of metal differ greatly, the metal separates in the melting processes of the metal under the high-temperature impact, the metal with low melting points is melted and gasified first, under the effect of thermal expansion, alloy particles expand and burst, and finer particles are formed. Even the metal with low boiling points is gasified when reaching the boiling point temperature, more violent burst is realized under the action of gas expansion, and finer particles are formed. Zinc and aluminum aresubjected to amorphous alloying, an amorphous alloy particle realizes thermal self-explosion in the ignition process by using the melting and boiling points of zinc and melting and gasification characteristics, the gasification rate of the amorphous alloy particle is increased, and thus the combustion efficiency of the amorphous alloy particle is improved.

A color photoresist with gold nanoparticles and color filters made therefrom are provided. The color photoresist with gold nanoparticles includes substituted acrylate monomers, gold nanoparticles (or clusters), surfactants and a photo-polymerization initiator. The color filter includes a polyacrylate, gold nanoparticles (or clusters) and surfactants. The gold nanoparticles (or clusters) can be dispersed in the color photoresist or the color filter by the surfactants.