Abstract:
A dispersant for carbon nanotubes is provided to improve a disperse effect by controlling structural properties of the dispersant, and to produce easily a carbon nanotube composition suitable for an emitter of a field emission display, carbon nanotube ink, and printable carbon nanotubes. A dispersant for carbon nanotubes comprises a head part of an aromatic ring and a tail part, wherein the tail part is regioregularly arranged. A ratio of the head part to the tail part is 1 or greater. A carbon nanotube composition includes 0.001-10wt% of the dispersant, 0.01-5wt% of carbon nanotubes, and the balance of a dispersing medium selected from an organic solvent, water, or a mixture thereof, based on 100wt% of the composition. Further, the tail part is C3-C20 of polyethyleneoxide or C4-C20 of polypropyleneoxide.
Abstract:
A transparent CNT(carbon nanotube) electrode using a conductive dispersant and a method of preparing the same are provided to remarkably improve the conductivity of a CNT thin film by using a doped dispersant. A CNT thin film layer(20) is formed on a transparent substrate(10). The CNT thin film layer includes a CNT(21) and a doped dispersant(22). The transparent substrate is a transparent inorganic substrate containing glass and quartz or a flexible transparent substrate selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, polyethylene sulfone, polycarbonate, polystyrene, polypropylene, polyester, polyimide, polyetheretherketon, polyetherimide, an acryl resin, an olefin maleimide copolymer, and a norbornene based resin. The CNT is at least one selected from the group consisting of a single-walled carbon nanotube, a double-walled carbon nanotube, a multi-walled carbon nanotube, and a rope carbon nanotube.
Abstract:
A method for manufacturing a memory device with a nano crystal and the memory device manufactured thereby are provided to improve the controllability of device characteristics and to enhance device characteristics by arranging uniformly nano crystals in a single layer due to an electrostatic attractive force using a polymer electrolyte layer formed on a tunneling oxide layer. At least one tunneling oxide layer(21) is formed on a substrate(11). A polymer electrolyte layer is formed on the tunneling oxide layer. A plurality of nano crystals are uniformly arranged on the polymer electrolyte layer. A control oxide layer(25) is formed on the resultant structure. Source and drain regions are formed in the substrate and a control gate is formed on the control oxide layer. The tunneling oxide layer consists of first and second tunneling oxide layers.
Abstract:
본 발명은 탄소나노튜브용 분산제 및 이를 포함하는 조성물에 관한 것으로서, 전자가 풍부한 원자 및 탄소나노튜브와의 친화성이 높은 방향족 고리로 구성된 헤드부와; 유기용매 및 수계용매에 친화성을 갖는 테일부를 포함하는 구조로 이루어져, 탄소나노튜브를 유기용매, 물, 또는 이들의 혼합물 등 다양한 종류의 분산매 내에서 안정화시키고 분산시키는 효과가 뛰어난 탄소나노튜브용 분산제 및 이를 포함하는 조성물에 관한 것이다. 본 발명의 분산제를 이용하면 전계방출디스플레이(FED)의 전계방출원(emitter), 탄소나노튜브 잉크, 프린터블 탄소나노튜브 등 각종 산업분야에서 필요한 탄소나노튜브 조성물을 용이하게 제조할 수 있는 이점이 있다. 탄소나노튜브, 분산제, 유기용매, 물, 전계방출원, 잉크, 페이스트
Abstract:
Provided are a dispersant which has a hydrophobic chain structure having head capable of being adsorbed into carbon nanotube in a wrapping form, and which can increase a dispersing property of the carbon nanotube and provide a solution of carbon nanotube, and a composition containing the same. The dispersant for carbon nanotube solution having high concentration is represented by formulas 1-6. The formula 1: (CF3(CF2)aCH2CH2)OxPO(OR')y(OCH2CH2OH)x, the formula 2: CF3(CH2)aCH2CH2SCH2CH2R, the formula 3: (CF3(CH2)aCH2CH2O)PO(OR')(OCH2CH2(CF2)bCF3), the formula 4: CF3(CF2)aCH2CH2R, the formula 5: CF3(CF2)aCH2CH2R, and the formula 6: CF3[(CF2CF2)a(CF2CF(OCF2CF(CF3)OCF2CF2R)]xCF3. In the formulas, each of a and b is an integer of 1 to 30 respectively(in case of formulas 1-4), R' is selected from the group consisting of H, NH4, Li, Na and K, x+y+z=3, x0, y0, R is selected from the group consisting of carboxylic acid or its salt, phosphoric acid or its salt, sulfonic acid or its salt, a is an integer of 50-160 in case of the formula 5, or an integer of 0-4 in case of the formula 6, and x is an integer of 45-160. The composition comprises the dispersant, an aqueous liquid medium, and a carbon nanotube.
Abstract:
A method of preparing nano-particle dispersion is provided to eliminate unstability, defects or aggregation of nano-particles and to use the dispersion to fabricated second- or three-dimensional thin film for flash memory, DRAM hard disk, LED, OLED, etc. by reforming surface of nano-particle, dispersing the reformed nano-particle in solvent and centrifuging the dispersion. The method includes the steps of: (a) reforming surface of nano-particles to have charge thereon; (b) vacuum drying the reformed nano-particles; and (c) centrifuging the nano-particles after dispersing the dried nano-particles in solvent. The surface reformation step is performed by adding the nano-particles to a charged solution and refluxing the mixture while agitating to react at desired temperature of 50 to 150deg.C for 1 to 10 hours. The vacuum drying step is carried out for 1 to 12 hours. The centrifugation step is executed at 4,000 to 50,000g for 1 minute to 3 hours. The nano-particles are selected from a group consisting of II-VI families, IV-VI families or IV family compound semiconductor, metal and magnetic particles.
Abstract:
Provided are a dispersant to reduce the viscosity of a paste composition containing the dispersant, a paste composition containing the dispersant, a display device using the paste composition, and a plasma display using the composition as a partition wall. The dispersant comprises a hydrophobic part which comprises a branched alkyl group and an arylene group; and a hydrophilic part which comprises an alkylene oxide group and a carboxyl group, wherein the alkyl group is a C5-C30 substituted or unsubstituted alkyl group; and the arylene group is a C6-C30 substituted or unsubstituted arylene group; and the alkylene oxide group is a C2-C10 substituted or unsubstituted alkylene oxide group. Preferably the dispersant is represented by R1-A-(OR2)n-(OR3)m-O-(CH2)k-COOH, wherein R1 is a C5-C30 substituted or unsubstituted branched alkyl group; A is a C6-C30 substituted or unsubstituted arylene group; R2 and R3 are independently a C2-C5 substituted or unsubstituted alkylene group; k is 0-4; n and m are independently an integer of 0-30; and 3
Abstract:
Provided are a paste composition which is excellent in dispersion and is improved in the content of an inorganic particle, a display device using the composition, and a plasma display using the composition as a partition wall. The paste composition comprises an inorganic filler; an organic solvent; and a phosphate ester-based dispersant containing an arylene group at a hydrophobic part. Preferably the phosphate ester-based dispersant is represented by [R1-A-(OR2)n-(OR3)m-O]k-PO(OH)_(3-k), wherein R1 is a C5-C30 substituted or unsubstituted alkyl group; A is a C6-C30 substituted or unsubstituted arylene group; R2 and R3 are independently a C2-C5 substituted or unsubstituted alkylene group; k is 1-3; n and m are independently an integer of 0-30; and 3
Abstract:
PURPOSE: To provide a method for preparing non-magnetic nickel powder from nickel precursor compound by combining a conventional nickel powder preparation method for converting nickel precursor compound into FCC(face centered cubic) phase nickel particles by using polyol as a reducing agent and a process for transition of phase of nickel particles by heating FCC phase nickel particles in polyol into a series of continuous steps. CONSTITUTION: The method for preparing non-magnetic nickel powder comprises a step(a) of reducing the nickel precursor compound into nickel metal particles having FCC(face centered cubic) crystalline structure by heating a mixture containing a nickel precursor compound and polyol; and a step(b) of heating the mixture obtained in the step(a) so that at least some of the nickel metal particles having FCC crystalline structure are phase changed into nickel metal particles having HCP(hexagonal-closest packed) crystalline structure.