Abstract:
Disclosed are methods for forming carbon-based fillers as may be utilized in forming highly thermal conductive nanocomposite materials. Formation methods include treatment of an expanded graphite with an alcohol/water mixture followed by further exfoliation of the graphite to form extremely thin carbon nanosheets that are on the order of between about 2 and about 10 nanometers in thickness. Disclosed carbon nanosheets can be functionalized and/or can be incorporated in nanocomposites with extremely high thermal conductivities. Disclosed methods and materials can prove highly valuable in many technological applications including, for instance, in formation of heat management materials for protective clothing and as may be useful in space exploration or in others that require efficient yet light-weight and flexible thermal management solutions.
Abstract:
A method for alignment of high aspect ratio materials (HARMs) within a liquid matrix by means of magnetic particles. The application of an external magnetic field creates a forced motion of the magnetic particles. This in turn leads to a laminar flow within the matrix which imposes a drag force on the HARMs, aligning the HARMs across the matrix. The used magnetic particles eventually accumulate at one end side of the matrix container and can be removed either by an incision or an extraction process. Unlike the previously proposed methods, there is no need for the magnetic particles to be attached either physically or chemically to the HARMs. Thus, the ultimate aligned HARMs are mostly pure and free of any magnetic particles. Once the matrix is a polymeric solution, the mentioned method is capable of synthesis of aligned HARMs-polymer composites, which exhibit improved mechanical and electrical properties.
Abstract:
The present invention provides a hard coating film having high hardness and excellent properties. The hard coating film has high hardness and is not easily curled.
Abstract:
A room temperature-curable electrically conductive fluorosilicone rubber composition comprises: (A) a fluoropolysiloxane capped at the molecular terminals with hydroxyl groups having a viscosity at 25° C. of from 1,000 to 1,000,000 mPa·s; (B) fine silica powder having a BET specific surface area of not less than 50 m2/g; (C) a carbon black; (D) a fibrous carbon allotrope having a graphene structure; and (E) a crosslinking agent. Component (D) is comprised in an amount of not less than 1.5 parts by mass per 100 parts by mass of component (A). The room temperature-curable electrically conductive fluorosilicone rubber composition is cured to form a cured product having both superior post-cure physical strength and electrical conductivity. Also, the room temperature-curable electrically conductive fluorosilicone rubber composition has viscosity that enables superior handling, and provides superior post-cure surface smoothness, solvent resistance, and adhesion.
Abstract:
The present invention provides a simple and economical process for preparation of metal-coated non-metallic nano/micro particles. The nano/micro particles are composed of a core and metallic coat over the core using silver or other transition/noble metals. The core of the non-metallic nano/micro particles are selected from inorganic material such as silica, calcium carbonate, barium sulfate, or emulsion grade polyvinyl chloride and other polymers prepared by emulsion process including porous polymers. The metal coating is selected from the transition/noble metals such as copper, nickel, silver, palladium, platinum, osmium, ruthenium, rhodium, and such other metals and their combinations that are easily reducible to elemental metal.
Abstract:
The present invention provides a resin composition for an electrically conductive resin film which is excellent in electric conductivity, tensile elongation, durability to bending and flexibility and is suitable as electrodes or protective coatings on the electrodes in redox flow batteries. A resin composition includes (A) 100 parts by mass of a thermoplastic resin, (B) 1 to 60 parts by mass of carbon nanotubes and (C) 1 to 100 parts by mass of at least one selected from the group consisting of acetylene black and graphite.
Abstract:
The present invention relates to processes to produce nanocomposites. In particular, the invention relates to solution processes using organic solvents and mixtures of solvents to produce polymeric nanocomposites.
Abstract:
Described herein is a method for producing a nanocomposite material, including nanofillers dispersed in a polymeric matrix. The method comprises the steps of: a) providing a starting thermoplastic polymeric material, having a crystalline structure; b) providing one or more precursors of the nanofillers; c) bringing the starting thermoplastic polymeric material into the molten state and dispersing the precursor or precursors therein; d) subjecting the precursor or precursors to in situ thermolysis, thereby generating the nanofillers directly within the melted material; and e) causing solidification of the molten polymeric material including the nanofillers, thereby obtaining the nanocomposite material. The precursor or the precursors are selected from among carbonates and acetylacetonates and the thermoplastic polymeric material is isotactic polypropylene.
Abstract:
The copolymer of styrene and methylmethacrylate containing reduced graphene oxide/silver nanoparticles (PS-PMMA/RGO/AgNPs) nanocomposite were prepared via in situ bulk polymerization method using two different preparation techniques. In the first approach, a mixture of graphene oxide (GO), styrene (S) and methylmethacrylate monomers (MMA) were polymerized using a bulk polymerization method with a free radical initiator. After the addition silver nitrate (AgNO3), the product was reduced via microwave irradiation (MWI) in presence of the reducing agent hydrazine hydrate (HH), to obtain R-(GO-(PS-PMMA))/AgNPs nanocomposite. This nanocomposite was then used to create a material that had antimicrobial properties to be used in medical devices or medical related implants.
Abstract:
The invention relates to a composition comprising a binder material and nanoparticles having an average particle size of 100 nm or less having a first refractive index of at least 1.65 in respect of light of a first wavelength, and a second refractive index in the range of 1.60-2.2 in respect of light of a second wavelength, wherein said first refractive index is higher than said second refractive index, and wherein the first and second refractive indices may be tuned by adjusting the volume ratio of the nanoparticles to the binder material. The composition may improve light extraction when used for bonding a ceramic member to an LED, and/or may reduce the amount of light that is directed back towards the LED.