• Bulletin of the Korean Chemical Society
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• 제6권5호
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• pp.284-287
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• 1985

Cyanoisopropyl radical derived from azobisisobutyronitrile (AIBN) by either thermolysis or photolysis reacts with oxygen to give cyanoisopropylperoxy radical which then was converted to acetone and cyano radical and/or acetyl cyanide and methyl radical. Of these products, acetone formed was quantitatively determined by the addition of thianthrene cation radical perchlorate to the reaction mixture. The results showed that 55.7 mmol, 16.9 mmol, and 16.0 mmol of acetone were formed for 7 hours from 1 mol of AIBN at $82{\pm}1^{\circ}C$ in acetonitrile, carbon tetrachloride, and benzene, respectively. However, 22.2 mmol of acetone was formed from photolysis of 1 mmol of AIBN in acetonitrile. The value decreased to 13.2 mmol by bubbling argon into the solvent prior to photolysis.

• 한국세라믹학회지
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• 제25권5호
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• pp.425-430
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• 1988

In this study, aluminum sec-butoxide, aluminum iso-propoxide were mixed with alcohol such as, secbutanol, iso-propanol. And then Acetyl Acetone, water were added to make Acetyl bond and OH bond. After that, Polymeric alumina sol was synthesized from catalysis reaction with strong acid typically HCl. These alumina soil was dried at 8$0^{\circ}C$~9$0^{\circ}C$ to have a optmum viscosty for spinning, spinned at spinner, and then sintered to make polycrystalline alumina fiber.

• 펄프종이기술
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• 제45권5호
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• pp.30-36
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• 2013

Hydrophobic property of Kapok fiber was investigated by sequential removal of its components by different extraction methods. Acetone extraction for the removal of the hydrophobic extractives, holo-cel-lulose preparation after the removal of lignin and xylan extraction by potassium hydroxide was applied. The degree of hydrophobicity of each samples were measured by the water sorption ability. The water sorption ability of Kapok fiber was increased by the sequential treatment of acetone extraction, holocellulose preparation and xylan removal. Based on holocellulose compositional analysis by $^1H$-NMR spectroscopic method, the unusual high amount of the acetyl groups in the holocellulose of Kapok partially contributed to the hydrophobicity of Kapok holocellulose fiber.

• 대한화학회지
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• 제56권1호
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• pp.62-67
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• 2012

A series of homo binuclear complexs of the type $[M_2(L/L^')(NO_3)n].mH_2O$, [where $M=U{O_2}^{2+},\;Th^{4+},\;ZrO^{2+}$] and $[(VO)_2(L/L^')(SO_4)_2]{\cdot}2H_2O$, L=1,5,6,9,12,15,16,20 octaaza-7,813,14-tetraphenyl-2,4,17,19-tetramethyl-1,4,6,8,12,14,16,19-docosaoctene (OTTDO) or L'=10:11;21:22-dibenzo-1,5,6,9,12,15,16,20-octaaza-7,813,14-tetraphenyl-2,4,17,19-tetramethyl-1,4,6,8,12,14,16,19-docosaoctene (DOTTOT), n=4 for $U{O_2}^{2+}$, $ZrO^{2+}$ n=8 for $Th^{4+}$ m=1,2,3 respectively, have been synthesized in template method from ethylenediamine/orthophenylene diamine, benzil monohydrazone and acetyl acetone and characterized on the basis of elemental analysis, thermal analysis, molar conductivity, magnetic moment, electronic, infrared, $^1H$-NMR studies. The results indicate that the VO(IV) ion is penta co-ordinated yielding paramagnetic complexes; $UO_2(VI)$, ZrO(IV) ions are hexa co-ordinated where as Th(IV) ion is octa co-ordinated yielding diamagnetic complexes of above composition. The fungi toxicity of the ZrO(IV) and VO(IV) complexes against some fungal pathogen has been studied.

• 전기화학회지
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• 제3권1호
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• pp.11-14
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• 2000

가시광선 영역에서의 높은 투과성과 우수한 전도성을 가진 전도성 ITO박막은 그 전기적 광학적 특성에 의해서 태양 전기 기판의 전극 재료나 Display소자의 투명전극으로 개발되고 있다. 이들의 제작은 현재 sputtering이 주종을 이루나 이들의 높은 생산비를 절감할 목적으로 sol-ge떫을 이용하여 ITO박막을 만들었다. ITO제조용 sol은 유기질 sol로는 indium tri-iso-propoxide를 ethylene glycol monoethyl ether에 녹인 후 $SnCl_4$를 dopant로 사용하여 제조하였다. Acetyl acetone을 넣어 sol이 수화되는 현상을 억제하였다. 무기질 sol로는 indium acetate를 n-propanol에 용해하여 사용하였다. Spin 방법을 이용하여 코팅하였으며 $500^{\circ}C$에서 열처리하였다. 가시 광선 영역에서의 투과도는 $90\%$ 이상을 얻었으며 비저항은 $0.01\Omega{\cdot}cm$가 측정되었다.

• 한국재료학회지
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• 제21권8호
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• pp.468-475
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• 2011

[ $LaMeO_3$ ](Me = Cr, Co) powders were prepared using the polymeric precursor method. The effects of the chelating agent and the polymeric additive on the synthesis of the $LaMeO_3$ perovskite were studied. The samples were synthesized using ethylene glycol (EG) as the solvent, acetyl acetone (AcAc) as the chelating agent, and polyvinylpyrrolidone (PVP) as the polymer additive. The thermal decomposition behavior of the precursor powder was characterized using a thermal analysis (TG-DTA). The crystallization and particle sizes of the $LaMeO_3$ powders were investigated via powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and particle size analyzer, respectively. The as-prepared precursor primarily has $LaMeO_3$ at the optimum condition, i.e. for a molar ratio of both metal-source (a : a) : EG (80a : 80a) : AcAc (8a) inclusive of 1 wt% PVP. When the as-prepared precursor was calcined at $700^{\circ}C$, only a single phase was observed to correspond with the orthorhombic structure of $LaCrO_3$ and the rhombohedral structure of $LaCoO_3$. A solid-electrolyte impedance-metric sensor device composed of $Li_{1.5}Al_{0.5}Ti_{1.5}(PO_4)_3$ as a transducer and $LaMeO_3$ as a receptor has been systematically investigated for the detection of NOx in the range of 20 to 250 ppm at $400^{\circ}C$. The sensor responses were able to divide the component between resistance and capacitance. The impedance-metric sensor for the NO showed higher sensitivity compared with $NO_2$. The responses of the impedance-metric sensor device showed dependence on each value of the NOx concentration.

• 한국환경보건학회지
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• 제29권2호
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• pp.50-55
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• 2003

3,3'-디클로로벤지딘(DCB)는 실험동물에 발암물질로 밝혀졌고, 사람에게 암을 유발시킬 수 있는 발암물질로 의심되고있다. 많은 연구자들이 사업장에서 DCB에 폭로된 근로자들을 대상으로 뇨중에 배설된 대사물질, 헤모글로빈 부가체, 그리고 암 발생율 등에 대하여 연구를 하고 있다. 이러한 연구를 하기 위해서는 표준물질로 되어 있는 DCB의 대사물질이 꼭 필요하다. 따라서 본 연구의 목적은 DCB를 이용하여 이들의 대사물질을 합성하여 표준물질로 사용코자 합니다. DCB는 벤젠. 에테르, 에탄올, 메탄올 등에 부분적으로 용해되지만, 구연산이 1 % 이하로 함유된 70% 아세트산, 피리딘, 0.1N NaOH와 톨로엔이 1:2로 섞인 혼합물, 20 mM TRIZA염으로 포화된 페놀 등에는 완전히 용해되기 때문에 본 연구에서는 DCB를 피리딘에 녹여서 사용하였다. DCB와 대사물질인 mono-acetyl-DCB 및 diacetyl-DCB는 가스크로마노그래피(GC/MS)로 분석하였고, 검출기는 NPD와 SIM를 사용하였다. DCB의 기본피크는 252 m/z이었고, mono-acetyl-DCB의 기본피크는 252와 294 m/z로 구성되어 있었으며. diacetyl-DCB의 기본피크는 252, 294, 336 m/z로 구성되어 있었다. Discetyl-DCB는 피리딘에 용해된 DCB에 염소아세틸를 충분히 적정하여 합성하였다. 이렇게 얻은 diacetyl-DCB의 순도는 98.7%이었다. 침전물위에 있는 용해물질 속에는 DCB. mono-acetyl-DCB, diacetyl-DCB가 함유되어 있었는데, 아세트산을 아세틸화를 조절하는 물질로 사용하여 DCB를 모두 아세틸화시키었고, diacetyl-DCB로부터 mono-acetyl-DCB를 분리하여 추출하였다. 추출된 mono-acetyl-DCB는 아세톤으로 세척하여 98.8%의 순도를 얻었다.

• Journal of the Korean Wood Science and Technology
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• 제29권4호
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• pp.48-52
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• 2001

강원대학교 구내림에서 자란 생장이 양호한 소나무 잎을 채취하여 아세톤-물(7 : 3, v/v)로 추출하고 네 개의 분획으로 분리한 후 에틸아세테이트용성 분획물에 대하여 Sephadex LH-20 칼럼으로 크로마토그래피를 실시하였으며 용리용매는 메탄올 및 에탄올 수용액과 에탄올-헥산 혼합액을 사용하였다. 단리된 화합물은 주로 flavan 화합물로 구성되어 있었으며 flavonoid 유도체인 kaempferol-3-O-g1ucopyranoside와 quercetin-3-O-(6"-O-acetyl)-gluco pyranoside도 소량으로 단리되었는데 이들은 소나무 잎의 추출성분에서는 처음으로 분리되었다. 단리된 화합물은 NMR 및 MS 스펙트럼을 이용하여 정확한 구조를 결정하였다.

• 한국세라믹학회지
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• 제32권3호
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• pp.281-288
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• 1995

to prepare the TiO2 thin films, acetyl-acetone(2.4-pentanedione)(1 : 1 molar ratio) was dissolved in the propanol solution of titanium(IV)isopropoxide(Ti[OCH(CH3)2]4). Al, Cr and Sb in the form of soluble salt and niobium ethoxide were added s dopants, respectively. Thin films were coated by the dip-coating method and characteristics were investigated by XRD, SEM and conductance meter. As a result, viscosity of sol was maintained below 4 centi Poise more than 20 days, and crystal growth and diminution of resistivity occurred as the heat treatment temperature increased. The grains grew over 1${\mu}{\textrm}{m}$ and the lowest resistivity was obtained when Nb was added at 130$0^{\circ}C$.

• 한국군사과학기술학회지
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• 제11권5호
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• pp.99-106
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• 2008

Metal ions such as Cu and Cr were extracted from the Cu, Cr and Ag impregnated active carbon by contacting the solid surfaces with supercritical carbon dioxide(Sc-$CO_2$) containing chelating agents. About 10g of the active carbon sample were loaded in a vertical tube extractor contacting with $CO_2$ flowing from the bottom of the tube for 6hrs. The ligands used were acetyl acetone(AA) and Cyanex-302(C-302). Water and methanol were used as entrainers to study the effect of co-solvent to $CO_2$. Experimental results showed that C-302 was more effective than AA in removing Cu with the maximum extraction of 42.0wt%, while 57.6wt% of Cr was extracted with AA from the sample.