• 제목/요약/키워드: Solution growth method

검색결과 640건 처리시간 0.026초

전해산화에 의한 배금전극상 전도성 폴리아닐린 피막의 생장거동(I) (Growth Behavior of Condutive Polyaniline Film on a Platinum by Electrochemical Oxidation(I))

  • 신성호;이주성
    • 한국표면공학회지
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    • 제21권2호
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    • pp.68-75
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    • 1988
  • To know the growth behavior of Conductive polyaniline file, the anodic oxidation of anilien on a platiunm in aqueous sulfuric acid solution has been studied. Cyclic votammetry and currenttime transisents method used to investigate the anodic oxidation of aniline to polyaniline films on a platinum. The oxidation of aniline is shown to occur in several steps dependent on the potential. it the phase growth resembles the deposition of a metal film.

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기능성 미립자의 표면개질방법에 의한 위생지 제조 (Making Hygiene Paper by Surface Modification Method of the Functional Particle)

  • 조준형;김연오;김원덕
    • 펄프종이기술
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    • 제40권2호
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    • pp.29-36
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    • 2008
  • In order to give pulp surfaces anti-bacterial functionality and photo-catalytic deodorant ability, functional pulps was made using a surface modification method with Ag nano-colloidal solution and $TiO_2$ filler. Hygiene paper was made with the specially modified pulp, and anti-bacterial and deodorant tests were carried out. The Ag nano-colloidal solution was coated on the surface of the pulp using the high pressurized gas phase squirt through the spray nozzle mounted on the hybridization system. The surface modified functional pulp was hybridized with the optimum ratio of $TiO_2$(fine particle) to pulp(core particle) under the condition of $6,000{\sim}10,000$ rpm for $3{\sim}7$ minutes in the system. The anti-bacterial functionality of the hygiene paper was confirmed by the halo test in which the formation of the clear zone around the hygiene paper sample was observed. The inhibition growth test using MIC bioscreen C showed the inhibition growth effect of the bacteria as the reaction time was increased. The photo-catalytic effect measurement of the $TiO_2$ for 4 hours of the reaction showed $50{\sim}60%$ of decomposition rate, reaching over 60% for 5 hours of the reaction.

DCPD 법을 이용한 TMCP 강의 부식피로수명 평가 (Evaluation of Corrosion Fatigue Life of TMCP Steel Using the DCPD Method)

  • 박진형;배동호
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 춘계학술대회
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    • pp.220-225
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    • 2003
  • In order to develop a method of corrosion fatigue design and estimate reliability of TMCP steel using as the material of heavy industries and plants, its corrosion susceptibilities and corrosion fatigue life considering corrosion degradation were investigated. From the results, the corrosion characteristic of TMCP steel is very susceptible in 3.5wt.% NaCl solution. Its susceptibility was linearly increased with the solution temperature increase. The potential difference due to the crack growth behavior in $25^{\circ}C$, 3.5wt.% NaCl solution is very susceptible. And it was found that stress amplitude has a linear relationship with the critical potential. Therefore, it is expected that the corrosion fatigue life of TMCP steel can be nondestructively predicted using the DCPD method.

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수열합성에 의한 c축 배향 ZnO 나노로드 배열의 성장과 구조, 광학적 특성 (Growth, Structural and Optical Properties of c-axis Oriented ZnO Nanorods Array by Hydrothermal Method)

  • 김경범;김창일;정영훈;이영진;백종후
    • 한국전기전자재료학회논문지
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    • 제23권3호
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    • pp.222-227
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    • 2010
  • ZnO nanorods array have been grown on the seed crystal coated Si(100) substrate by hydrothermal method. The growth, structural and optical properties of ZnO nanorods array were investigated with a variation of precursor concentration from 0.01 M to 0.04 M. The array density of grown ZnO nanorods per same area was increased with increasing the concentration of precursor solution. Vertically aligned ZnO nanorods with hexagonal wurtzite structure have highly preferred c-axis orientation along (002) lattice plane. Especially, ZnO nanorods array developed from 0.04 M precursor solution showed a diameter of about 85 nm and length of 1.2 {\mu}m$ without any crystallographic defects. The photoluminescence spectra of ZnO nanorods from heavier precursor concentration exhibited stronger UV emission around 380 nm corresponding with near-band-edge emission.

영상정보를 이용한 자동화 온실에서의 작물 성장 상태 파악에 관한 연구 (Identification of Crop Growth Stage by Image Processing for Greenhouse Automation)

  • 김기영;류관희;전성필
    • Journal of Biosystems Engineering
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    • 제24권1호
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    • pp.25-30
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    • 1999
  • The effectiveness of many greenhouse environment control methodologies depends on the growth information of crops. Acquisition of the growth information of crops requires a non-invasive and continuous monitoring method. Crop growth monitoring system using digital imaging technique was developed to conduct non-destructive and intact plant growth analyses. The monitoring system automatically measures crop growth information sends an appropriate control signal to the nutrient solution supplying system. To develop the monitoring system, a linear model that explains the relationship between the fresh weight and the top projected leaf area of a lettuce plant was developed from an experiment. The monitoring system was evaluated buy successive lettuce growing experiments. Results of the experiments showed that the developed system could estimate the fresh weight of lettuce from a lettuce image by using the linear model and generate an EC control signal according to the lettuce growth stage.

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Electrodeposition에 의해 성장온도와 시간을 달리하여 성장한 ZnO 나노구조의 특성 (Effects of Growth Temperature and Time on Properties of ZnO Nanostructures Grown by Electrodeposition Method)

  • 박영빈;남기웅;박선희;문지윤;김동완;강해리;김하은;이욱빈;임재영
    • 한국표면공학회지
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    • 제47권4호
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    • pp.204-209
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    • 2014
  • The electrodeposition of ZnO nanorods was performed on ITO glass. The optimization of two process parameters (solution temperature and growth time) has been studied in order to control the orientation, morphology, density, and growth rate of ZnO nanorods. The structural and optical properties of ZnO nanorods were systematically investigated by using field-emission scanning electron microscopy, X-ray diffractometer, and photoluminescence. Commonly, the results of the structural property show that hexagonal ZnO nanorods with wurtzite crystal structures have a c-axis orientation, and higher intensity for the ZnO (002) diffraction peaks. Furthermore, the nanorods length increased with increasing both the solution temperature and the growth time. The results of the optical property show a strong UV (3.28 eV) peaks and a weak visible (1.9~2.4 eV) bands, the intensity of UV peaks was increased with increasing both the solution temperature and the growth time. Especially, the UV peak for growth of nanorods at $75^{\circ}C$ blue-shift than different temperatures.

크라이신 사이크로푸로판카복실레이트의 육모효과 (Hair-growth Effect of Chrysin 7-O-cyclopropanecarboxylate)

  • 장지면;이명철;신준수;정재훈;김양배;김박광
    • Biomolecules & Therapeutics
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    • 제9권1호
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    • pp.15-19
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    • 2001
  • The derivative of chrysin 7-O-cyclopropanecarboxylate was synthesized by condensing cyclopropanecarboxylic acid with chrysin in organic solvent, and its structure was identified by NMR, MS, UV IR etc. We also investigated the physico-chemical properties, anti-diabetic effect and set up the quantitative analytical method of this compound. The correlation coefficient of calibration curve on this compound was approximately 0.9985 by absorption spectrophotometry. And, this study was carried out to investigate the hair-growth effect of chrysin derivative to the black mouse (C57BL/6). When this derivative in ethanol solution was administered to the back of mouse by method of skin paste, this derivative promoted the hair growth of mouse.

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크라이신 7-O-크로토네이트의 물성 및 육모효과 (Properties and Hair-growth Effect of Chrysin 7-O-crotonate)

  • 신준수;김연희;정재훈;김양배;김박광
    • 약학회지
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    • 제43권3호
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    • pp.316-319
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    • 1999
  • Chrysin 7-Ο-crotonate was synthesized by condensing crotonic acid with chrysin in organic solvent, tetrahydrofuran (THF) using dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP). Its structure was indentified by NMR, MS, UV, IR etc. We also investigated the physico-chemical properties and set up the quantitative anytical method of this compound. The correlation coefficient of calibration curve measured at the isobestic point (340 nm) on this compound was approximately 0.9994 by absorption spetrophtometry. Detection limit was 1.6ng at S/N=3 by using a RP column by HPLC. The hair growth effect fo chrysin 7-Ο-crotonate on the hair of black mouse (C57BL/6), was carried out using paste method. When its ethanol solution was administered to this black mouse by route of skin, this compound promoted the growth of hair.

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The Experimental Study on Inhibitory Effects of Wild Ginseng Pharmacopuncture Solution on Melanin Biosynthesis

  • Jo, Na Young
    • Journal of Acupuncture Research
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    • 제35권4호
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    • pp.182-186
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    • 2018
  • Background: The purpose of this study was to investigate the effects of wild ginseng pharmacopuncture on melanin production in B16/F10 murine melanoma cells. Methods: To determine the effect of wild ginseng pharmacopuncture solution on B16/F10 cells, cytotoxicity was evaluated using the 3-(4,5-dimethylthiazol-2-yl)- 2,5-diphenyl-tetrazolium bromide (MTT) method. To observe B16/F10 cell growth, death, and morphological changes, Trypan blue solution was used. The Hosoi method was used to investigate the effect of wild ginseng pharmacopuncture solution on melanin production. The Martinez-Esparza method was used to investigate the effect of wild ginseng pharmacopuncture solution on tyrosinase activity. To determine the pathway involved in the melanogenesis in cells exposed to wild ginseng pharmacopuncture solution, a cell-free tyrosinase was used. Results: Following treatment with $200{\mu}L$ of wild ginseng solution, the cell survival rate was $76.32{\pm}2.45%$ which significantly decreased with higher concentrations (${\mu}L$) of wild ginseng (up to $200{\mu}L$). When $100{\mu}L$ of wild ginseng was used, the cell survival rate was $89.95{\pm}2.07%$. No morphological changes or abnormalities were observed in the B16/F10 murine melanoma cells as observed in the Trypan blue test. Melanin production was significantly reduced to $72.17{\pm}3.74%$ at $100{\mu}L$. Using $100{\mu}L$ of wild ginseng solution, tyrosinase activity was significantly decreased to $80.15{\pm}1.05%$. Wild ginseng pharmacopuncture solution reduced melanin production both directly and indirectly. Conclusion: This study suggests that wild ginseng pharmacopuncture solution may be effective in inhibiting melanin production. Further studies are needed to determine safe and effective clinical applications.

Al-Alloy 7075-T651의 부식피로균열 성장거동에 관한 연구(I) (A Study on Corrosion Fatigue Crack Growth Behavior in Al-Alloy 7075-T651 (I))

  • 김봉철;한지원;우흥식
    • 한국안전학회지
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    • 제13권4호
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    • pp.113-120
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    • 1998
  • Fatigue crack growth rates(i.e. crack initiation and crack growth of short and long crack) are investigated using commercial plates of high strength Al alloy 7075-T651 for the transverse-longitudinal(T-L) direction in air, water and sea water. Also, the evaluation direct current potential drop(D.C.P.D) method and the fractographical analysis by SEM are carried out. Near threshold region, short crack growth rates were much faster than those of comparable long cracks, and these short crack growth rates actually decrease with increasing crack growth and eventually merge with long crack data. Fatigue crack propagation rates in aggressive media(i.e. sea water) increase noticeably over three times those in air. One of the most significant characters in this phenomenon as a corrosion-fatigue causes an acceleration in crack growth rates. Sea water environment, particularly Cl$^{[-10]}$ solution brings the most detrimental effects to aluminum alloy. The result of fractographical morphology in air, water and sea water by SEM shows obvious dimpled rupture and typical striation in air, but transgranular fracture surface in water and sea water.

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