Abstract:
본 발명은 촉매 담체, 흡착제 및 각종 표면 코팅제로 적합하게 사용될 수 있는 미세하고 균일한 입도 분포와 큰 기공 부피를 가지는 뵈마이트(boehmite) 또는 의사뵈마이트(pseudoboehmite) 구조의 다공성 알루미나의 제조방법에 관한 것이다.
Abstract:
본 발명은 고비점 유기 용매에 커플링제 및 텔륨 산화물을 혼합, 반응시켜 Te 나노와이어를 제조하고, 이를 비스무스(Bi) 화합물과 혼합함으로써 비스무스 이온의 환원에 의하여 Bi 2 Te 3 나노튜브를 제조하는 방법에 관한 것이다. 본 발명에 의하여 Bi 2 Te 3 나노튜브를 제조하는 경우 간단하면서도, 대량 제조가 가능하므로, 용액상에서 균일한 1차원 나노튜브를 제조에 광범위하게 적용될 수 있을 것으로 기대된다.
Abstract:
PURPOSE: A manufacturing method of tellurium-based nano-wires and bismuth telluride nano-tubes is provided to obtain the tellurium-based nano-wires by mixing a coupling agent and tellurium oxides with organic solvents of high boiling points. CONSTITUTION: A manufacturing method of tellurium-based nano-wires includes the following: one or more organic solvents are mixed with a coupling agent to become a mixed solution; and a tellurium oxide selected from a group including TeO_2, TeO, TeO_3, Te_2O_5, and Te_4O_9 to be reacted. The organic solvents are selected from a group including ethylene glycol, oleic acid, oleylamine, hexadecane, ethylene diamine, dimethyl formamide, pyridine, and acetone. The coupling agent is made of trialkyl phosphine, trialkyl phosphine oxide, alkyl amine, alkyl thiol, phenyl sulfone, or aminophenyl sulfone. The pH value of the mixed solution is adjusted in a range between 8 and 13.
Abstract:
PURPOSE: A tellurium nanotube of solvothermal synthesis and a manufacturing method of bismuth telluride are provided to manufacture Te nano-tube by reacting a high-boiling point organic solvent, coupling agent, and Tellurium compound and to mass produce Bi2Te3 nano-tubes. CONSTITUTION: A tellurium nanotube of solvothermal synthesis comprises the following steps: manufacturing a mixed solution by mixing organic solvent with a coupling agent; and reacting tellurium compound in the mixture. The organic solvent is one or more kinds which are selected from ethylene glycol, oleic acid, oleylamine, hexadecane, ethylenediamine, dimethylformamide, pyridine, and acetone. The coupling agent is selected from polyviny pyrrolidone, polyvinylalcohol, cetyl-trimethyl-ammonium-bromide, ethylenediaminotetraacetic acid disodium salt, and sodium dodecyl-benzene-sulfonate. A manufacturing method of the Bi2Te3 nanotubes comprises a step of reacting a solution including bismuth compound and reducing agent with a solution which includes Te nano-tubes.
Abstract:
PURPOSE: Cementless concrete using blast slag and a method for manufacturing the same are provided to adequately control the mobility and a time for a coagulating process by coating a water-reducing agent mixed with sugar to the blast slag and adding an activator. CONSTITUTION: Blast slag, fine aggregate, and a water reducing agent mixed with sugar are mixed in a mixer. An activator, coarse aggregate, and water are additionally introduced into the mixer and are mixed. The water reducing agent mixed with super is composed of the combination of sugar and at least one of a melamine-based material or a lignin-based material. The content of the water reducing agent mixed with sugar is 1.5 to 4.5 parts by weight, based on 100 parts by weight of the blast slag. The activator includes at least one of sodium hydroxide or sodium silicate.
Abstract:
A method for preparing flaky alpha-alumina crystals is provided to allow easy control of the thickness and size of the crystals, to maintain an aspect ratio of at least 100, and to realize the use of the alpha-alumina crystals as a matrix for a high-quality pearl pigment, ceramic material or filler. A method for preparing flaky alpha-alumina crystals comprises the steps of: mixing an aqueous aluminum precursor solution containing an aqueous solvent with an aqueous precursor solution containing 0.05-5 parts by weight of a zinc precursor and 0.01-0.5 parts by weigh of a tin precursor based on 100 parts by weight of the aluminum precursor to provide an aqueous metal precursor solution; titrating the aqueous metal precursor solution with an aqueous sodium salt solution to a pH of 6.0-7.5 and carrying out hydrolysis to obtain a mixed gel; pretreating the mixed gel by aging the mixed gel at 60-100 deg.C for 5-30 hours, followed by drying; drying the pretreated gel at 60-200 deg.C for 5-30 hours; crystallizing the dried gel at 850-1300 deg.C for 1-8 hours to obtain crystallized cake; and cooling the crystallized cake to room temperature, dissolving the cake into water at 20-90 deg.C, followed by filtering to remove the solvent, and dispersing the resultant product into 0.1-30% sulfuric acid solution at 20-90 deg.C, followed by filtering, washing with water and drying to obtain alpha-alumina crystals. Further, the aluminum precursor is selected from acid salts of an aluminum, a halide and an oxide.
Abstract:
PURPOSE: A method for manufacturing a multi-functional granular adsorptive material is provided to fundamentally improve demerits of an existing manufacturing method which is artificially combined simply using zeolite, activated carbon and binder by directly manufacturing zeolite and an activated carbon composite material using raw materials of bran and sodium aluminate aqueous solution. CONSTITUTION: The method for manufacturing a multi-functional granular adsorptive material comprises the processes of granulating the blended material by blending bran powder and sodium aluminate aqueous solution; and performing hydrothermal treatment using a sodium hydroxide aqueous solution after passing the granulated materials through carbonization and activation processes, wherein the carbonization process is performed under the temperature condition of 400 to 700 deg.C, or 750 to 950 deg.C under the infusion of steam, wherein the hydrothermal treatment comprises the processes of adding 3 to 8 wt.% of alkaline aqueous solution, aging at a temperature of 10 to 60 deg.C, and crystallization at a temperature of 80 to 110 deg.C, and wherein the adsorptive material is characterized in that a content of A, X or Y type zeolite is 55 to 70 wt.%, and a content of an activated carbon is 30 to 45 wt.%.
Abstract:
본 발명은 층상결정성 이규산나트륨의 제조방법에 관한 것으로서, 더욱 상세하게는 SiO 2 /Na 2 O이 몰비가 1.80~2.20 범위로 저정되어 생산된 컬릴(cullet)분말을 출발물질로 하여 여기에 소량의 물을 가하여 조립입상물을 먼저 제조하고 이 조립입상물을 소성로에 투입한 다음 소성공정만을 거치는 간단한 방법으로 층상결정성 이규산나트륨을 제조함으로써, 기존방법에 비하여 제품의 순도를 높이고 제조공정을 단순화 하는 한편, 에너지 소모를 획기적으로 줄일 수 있어 원가절감은 물론 장치내에 반응물이 침적되는 현상을 개선하여 물 연화제(water softmer) 또는 세제조성물의 빌더(builder)로서 유용한 층상결정성 이규산나트륨의 새로운 제조방법에 관한 것이다.
Abstract:
본 발명은 비스무트 텔루라이드(Bi 2 Te 3 ) 나노튜브의 제조방법 및 이에 따라 제조되는 열전특성이 향상된 비스무트 텔루라이드(Bi 2 Te 3 ) 나노튜브를 제공하는데 있다. 이를 위하여 본 발명은 트리옥틸포스핀옥사이드(tri-octylphosphineoxide, TOPO), 제 3 인산소다(Na 3 PO 4 ·12H 2 O), 소듐도데실벤젠설퍼네이트(sodium dodecyl-benzene-sulfonate, SDBS) 및 세틸트리메틸암모늄브로마이드(cetyl-trimethyl-ammonium-bromide)로 이루어진 군으로부터 선택되는 1종과 폴리비닐피롤리돈(Polyvinylpyrrolidone, PVP), 폴리비닐알콜(polyvinylalcohol) 및 에틸렌다이아미노테트라아세트산 염(sodium dodecyl-benzene-sulfonate)으로 이루어진 군으로부터 선택되는 1종으로 이루어진 캡핑제(capping agent)를 포함하는 용매에 산화텔루륨(TeO 2 )을 용해하고 환원제를 첨가하여 텔루륨 나노와이어를 제조하는 단계(단계 1); 비스무트 전구체 용액을 상기 단계 1의 텔루륨 나노와이어와 혼합하고 환원제를 첨가하여 혼합용액을 제조하는 단계(단계 2); 및 상기 단계 2의 혼합용액을 열처리하여 비스무트 텔루라이드(Bi 2 Te 3 ) 나노튜브를 제조하는 단계(단계 3);를 포함하는 비스무트 텔루라이드(Bi 2 Te 3 ) 나노튜브의 제조방법을 제공한다.
Abstract:
The present invention relates to a method for manufacturing conductive long fiber and conductive long fiber manufactured thereby. More particularly, the present invention provides a method for manufacturing long fiber, comprising the steps of: manufacturing conductive long fiber by electrospinning a spinning solution including poly(amide-co-imide) and Poly(trimellitic anhydride chloride-co-4,4′-methylenedianiline), which are mixed in a weight ratio of 4.5:5.5 to 5.5:4.5 (step 1); and coating the surface of the long fiber with conductive particles by immersing the long fiber, which has been manufactured in the step 1, sequentially in aqueous solution of polyethyleneglycol (PEG), solution of conductive metal precursors and washing liquid (step 2), wherein step 2 is conducted continuously as the long fiber is moved to a recovery part for recovering long fiber. The method for manufacturing conductive long fiber according to the present invention does not require many devices or much time compared with existing surface treatment by alkali solution for electroless plating or a method using a precious metal catalyst. In addition, the present invention can be applied easily to industrial scenes as a single process for continuously coating can be developed, thus reducing electroless plating time and increasing productivity greatly.