• Bulletin of the Korean Chemical Society
• /
• 제15권1호
• /
• pp.88-90
• /
• 1994

• 한국세라믹학회지
• /
• 제38권1호
• /
• pp.22-27
• /
• 2001

$\beta$-Si$_3$N$_4$종자입자 첨가가 소결조제로 Y-Mg-Si-Al-O-N계 oxynitride glass를 사용하여 일축가압 소결을 행한 SiC-Si$_3$N$_4$복합재료의 미세구조와 기계적 특성에 미치는 영향을 고찰하였다. 길게 자란 $\beta$-Si$_3$N$_4$입자들과 등방성의 $\beta$-SiC 입자들이 균일하게 분포된 미세구조를 얻었다. $\beta$-Si$_3$N$_4$종자입자 함량이 증가함에 따라 SiC-Si$_3$N$_4$복합재료의 강도와 파괴인성이 증가하였고, 이는 복합화에 기인하는 결함크기의 감소와 길게 자란 $\beta$-Si$_3$N$_4$입자에 의한 균열가교 및 균열회절 등에 기인하였다. SiC-70 wt% Si$_3$N$_4$복합재료의 대표적인 강도와 파괴인성은 각각 770 MPa과 6.2 MPa.m$^{1}$2/ 이었다.

• 약학회지
• /
• 제30권4호
• /
• pp.163-168
• /
• 1986

Thirteen compounds were synthesized by condensing the N-heterocyclic amines (piperidine, pyrrolidine, morpholine) and secondary aliphatic amines (dimethylamine, diethylamine) with 3,4-methylenedioxyphenylalkenoic acid chlorides for developing CNS depressants. Among them, N, N-diethyl-3,4-methylenedioxycinnamamide (IX) and N, N-dimethyl-5-(3,4-methylenedioxyphenyl)-2, 4-pentadienoic acid amicle (XII) exhibited strong activity in antagonism against pentylenetetrazole-induced convulsion, strychnine-induced convulsion and maximal electroshock seizure. N, N-Dimethyl-3, 4-methylenedioxycinnamide (VIII) showed more potent activity in antagonism against strychnine-induced convulsion and maximal electroshock seizure and in the prolongation of hexobarbital sleeping time.

• 한국세라믹학회지
• /
• 제33권6호
• /
• pp.686-692
• /
• 1996

• 식물분류학회지
• /
• 제42권4호
• /
• pp.307-315
• /
• 2012

한국산 나비나물속(Vicia)에 속하는 10분류군의 체세포 염색체수와 그 중 6분류군에 대한 핵형분석을 실시하였다. 본 연구에서 밝혀진 나비나물속의 체세포 염색체수는 2n = 12, 14 또는 24로서, 기본 염색체수 x = 6 또는 7의 이배체와 사배체로 밝혀졌다. 한국특산식물인 나래완두(V. hirticalycina, 2n = 2x = 12)의 염색체수는 본 연구에서 처음으로 밝혀졌다. 가는살갈퀴(V. angustifolia, 2n = 2x = 12), 등갈퀴나물(V. cracca, 2n = 4x = 24), 새완두(V. hirsuta, 2n = 2x = 14), 얼치기완두(V. tetrasperma, 2n = 2x = 14 + 2B), 벌완두(V. amurensis, 2n = 2x = 12), 노랑갈퀴(V. chosenensis, 2n = 2x = 12, 12 + 2B), 나비나물(V. unijuga, 2n = 4x = 24), 애기나비나물(V. unijuga f. minor, 2n = 4x = 24), 광릉갈퀴(V. venosa var. cuspidata, 2n = 4x = 24)의 체세포 염색체수는 기존의 보고들과 일치하였다. 핵형분석 결과, 등갈퀴나물은 2 m + 8 sm+ 2 st, 벌완두는 2 m + 2 sm + 2st, 나래완두는 3 m + 1 sm+ 2 st, 나비나물과 애기나비나물은 4 m + 6 sm + 2 st, 광릉갈퀴는 4 m + 8 sm로 각각 조사되었다.

• 한국응용과학기술학회지
• /
• 제3권1호
• /
• pp.65-71
• /
• 1986

Four amphoteric surfactants, 1-(N-alkyl-N,N-dimethyl ammonio)-4-naphthalene sulfonates, were prepared by the alkylation of 1-(N,N-dimethylamino)-4,naphthalene sulfonic acid with chloroalkanes such as 1-decylchloride, 1-tetradecyl chloride and 1-hexadecyl chloride. These quaternary ammonium compounds such as 1-(N-decyl-N, N-dimethylammonio)-4-naphthalene sulfonate, 1-(N-dodecyl-N,N-dimethylammonio)-4-naphthalene sulfonate, 1-(N-tetradecyl-N,N-dimethylammonio)-4-naphthalene sulfonate and 1-(N-hexadecyl-N,N-dimethylammonio)-4-naphthalene sulfonate could be separated by means of thin layes chromatography and column chromatography. The surface chemical properties such as surface tension, foaming power, foam stability, wetting efficiency and solubilizing effect for these four compounds were measured. Also critical micelle concentration and hydrophilic-lipophilic balance(HLB) were evaluated. These compounds showed good surface as O/W type emulsifying agent and detergent.

• 대한화학회지
• /
• 제26권6호
• /
• pp.403-406
• /
• 1982

N, N-디메틸포름아미드 디알킬 아세탈류를 N-아실-1,4-디메톡시-2-나프틸아민의 몇 가지에 반응시켰더니 어느 경우에나 동일한 생성물인 N,N-디메틸-N'-2-(1,4-디메톡시)나프틸우레아 만이 생성 되었다. 이들 반응으로부터 N,N-디메틸포름아미드 디알킬아세탈은 반응 상대화합물에 전자밀도가 낮은 원자가 있을 때는 친핵 공격으로 반응하는 디메틸아미노화 시약으로 작용한다는 사실을 발견 하였다.

• 한국전기전자재료학회논문지
• /
• 제25권1호
• /
• pp.44-47
• /
• 2012

The $TiO_2/Si_3N_4/Ag/Si_3N_4/TiO_2$ multi layered structure was designed for the possible application of transparent electrodes in PDP (Plasma Display Panel). Multi layered film was deposited on a glass substrate at room temperature by DC/RF magnetron sputtering system and EMP (Essential Macleod Program) was adopted to optimize the optical characteristics of film. During the deposition process, the Ag layer in $TiO_2/Ag/TiO_2$ became heavily oxidized and the filter characteristic was degraded easily. In thus study, Si3N4 layer was used as a diffusion buffer layer between $TiO_2$ and Ag. in order to prevent the oxidation of Ag layer in $TiO_2/Si_3N_4/Ag/Si_3N_4/TiO_2$ structure. It was confirmed that $Si_3N_4$ layer is one of candidate materials acting as diffusin barrier between $TiO_2/Ag/TiO_2$.

• Bulletin of the Korean Chemical Society
• /
• 제30권2호
• /
• pp.348-354
• /
• 2009

Copper(II) complexes with tetraoxo dithia tetraaza macrocyclic ligands; [18]ane$N_4S_2$: 1,4,10,13-tetraaza-5,9,14,18-tetraoxo-7,16-dithia-cyclooctadecane, [20]ane$N_4S_2$: 1,5,11,15-tetraaza-6,10,16,20-tetraoxo-8,18-dithia-cyclocosane,Bzo2[18]ane$N_4S_2$: dibenzo-1,4,10,13-tetraaza-5,9,14,18-tetraoxo-7,16-dithia-cyclooctadecane, Bzo2[20]ane$N_4S_2$: dibenzo-1,5,11,15-tetraaza-6,10,16,20-tetraoxo-8,18-dithia-cyclocosane; were entrapped in the nanopores of zeolite-Y by a two-step process in the liquid phase: (i) adsorption of [bis(diamine)copper(II)] (diamine = 1,2-diaminoethane, 1,3-diaminopropane, 1,2-diaminobenzene, 1,3-diaminobenzene); $[Cu(N-N)_2]^{2+}$-NaY; in the nanopores of the zeolite, and (ii) in situ template condensation of the copper(II) precursor complex with thiodiglycolic acid. The obtained complexes and new host-guest nanocomposite materials; $[Cu([18]aneN_4S_2)]^{2+}-NaY,\;[Cu([20]aneN_4S_2)]^{2+}-NaY,\;[Cu(Bzo_2[18]aneN_4S_2)]^{2+}-NaY,\;[Cu(Bzo_2[20]aneN_4S_2)]^{2+}$-NaY; have been characterized by elemental analysis FT-IR, DRS and UV-Vis spectroscopic techniques, molar conductance and magnetic moment data, XRD and, as well as nitrogen adsorption. Analysis of data indicates all of the complexes have been encapsulated within nanopore of zeolite Y without affecting the zeolite framework structure.

• 약학회지
• /
• 제34권1호
• /
• pp.15-21
• /
• 1990

-4,9-dione derivatives were prepared from $2-chloro-3-({\alpha}-accetyl-{\alpha}-ethoxycarbonyl-methyl)-1,4-naphthoquinone$ and 2-chloro-3-N-phenylamino-1,4-naphthoquinone. $2-Chloro-3-({\alpha}-acetyl-{\alpha}-ethoxycarbonyl-methyl)-1,4-naphthoquinone$ was reacted with amines to give $2-amino-3-({\alpha}-acetyl-{\alpha}-ethoxycarbonyl-methyl)-1,4-naphthoquinone$ derivatives. Subsequent treatment of $2-amino-3-({\alpha}-acetyl-{\alpha}-ethoxycarbonyl-methyl)-1,4-naphthoquinone$ with sodium ethoxide gave -4,9-dione derivatives. When 2-chloro-3-N-phenylamino-1,4-naphthoquinone reacted with sodium ${\alpha}-cyano$ ethyl acetate, 2-amino-3-ethoxycarbonyl-N-phenyl--4,9-dione was obtained. However, with sodium diethyl malonate, not -4,9-dione but 2-chloro-3-bis-(methoxycarbonyl)-methyl-2H-3-N-phenylamino-1,4-naphthoquinone was obtained.