• 제목/요약/키워드: Photochromic

검색결과 91건 처리시간 0.024초

Synthesis and Photoinduced Magnetic Properties of a Mn12 Single Molecule Magnet by the cis-trans Isomerism of Azobenzene

  • George, Sheby M.;Kim, Jin-Kwon
    • Bulletin of the Korean Chemical Society
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    • 제30권5호
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    • pp.1143-1146
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    • 2009
  • [$Mn_{12}O_{12}(azo-L)_{16}(H_2O)_4$] (1), a new Mn12 single molecule magnet containing a photochromic azobenzene ligand, has been successfully synthesized by substitution of acetate ligand of Mn12 with 6-[4-{4-hexyloxyphenyl( azo)}-phenoxy]hexanoic-1-acid. The reversible photoisomerization of the azobenzene group was confirmed by UV-visible absorption spectroscopy. The temperature and field dependence of dc susceptibility and the temperature and the frequency dependence of ac susceptibility were measured for the cis and the trans isomer of 1. The magnetization value of the cis isomer in dc measurement is higher than that of the trans isomer. The cis isomer of 1 has a slower relaxation because cis-trans photoisomerization of the azobenzene group in peripheral ligands induces changes in its structure and dipole moment.

DLPC 인지질 단분자막의 변위전류 특성 (Displacement Current Characteristics of DLPC Lipid Monolayer)

  • 최용성;송진원;이경섭
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 추계학술대회 논문집 전기물성,응용부문
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    • pp.10-11
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    • 2006
  • The azobenzene dendrimer is one of the dendrimeric macromolecules that include the azo-group exhibiting a photochromic character. Due to the presence of the charge transfer element of the azo-group and its rod-shaped structure, these compounds are expected to have potential interest in electronics and photoelectronics, especially in nonlinear optics. In the present paper, we give pressure stimulation to organic thin films and detect the induced displacement current. Functional photoisometrization organic molecular the photo-stimulus to organic monomolecular L films and LB films of dendrimer and SASH were performed. The SASH organic monolayer in case of pressure stimulus occurred that positive course but in case of the photo-stimulus compared positive and negative. It is assumed that generation forms of displacement current were measured when photo-stimulus for impression.

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Bicyclic Derivatives of Aziridine - Materials for New Indicators of Radiation

  • Chebanov, V.A.;Zbruyev, A.I.;Desenko, S.M.;Doroshenko, A.O.;Vaschenko, V.V.
    • Journal of Radiation Protection and Research
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    • 제30권1호
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    • pp.31-34
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    • 2005
  • The article is devoted to the study of some hi-and tricyclic derivatives of aziridine as materials lot newindicators of ionizing radiation. To create high sensitive materials some aspects of photo induced ring opening processes in aziridine derivatives in ethanol solutions and in polymeric matrix were studied and two steps character of the processes investigated was established. Two types of radioindicators were suggested and preliminary tested. The new way of synthesis of radiochromic derivatives of aziridine was developed and series of target compounds synthesized.

벽 탄성도가 확장관(인조혈관) 벽 전단변형률에 미치는 영향 (The Effects of Wall Elasticity on Wall Shear Rate of a Divergent Tube (Vascular Graft))

  • 이계한;이상만
    • 대한기계학회논문집A
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    • 제23권6호
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    • pp.912-921
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    • 1999
  • Shear stress acting on the arterial wall by blood flow is an important hemodynamic factor influencing blocking of blood vessel by thickening of an arterial wall. In order to study the effects of wall elasticity on the wall shear rate distribution in an artery-divergent graft anastomosis, a rigid and a elastic model are manufactured. These models are placed in a pulsatile flow loop, which can generate the desired flow waveform. Flow visualization method using a photochromic dye is used to measure the wall shear rate distribution. The accuracy of measuring technique is verified by comparing the measured wall shear rate in the straight portion of a model with the theoretical solution. Measured wall shear rates depend on the wall elasticity and flow waveform. The mean and maximum shear rate in the elastic model are lower than those in rigid model, and the decreases are more significant near the end of a divergent tube. The reduction of mean and maximum of wall shear rate in an elastic model are up to 17 percent.

프리즘과 광섬유-평면도파로의 소산장 결합을 이용한 자외선 센서 (UV Sensor using Evanescent Field Coupling of Prism and Fiber-to-Planar Waveguide Coupler)

  • 조강민;윤정현;김응수;이승하;강신원
    • 센서학회지
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    • 제13권5호
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    • pp.350-355
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    • 2004
  • A novel UV sensor was manufactured and characterized using the evanescentfield coupling between fiber-planar waveguide (PWG) coupler and prism. A spiroxazine dye was chosen as planar waveguide because its photochromic isomerization induced by UV irradiation. A novel UV sensor was proposed to measure the variation of refractive index and absorption coefficient simultaneously. The wavelength responses of these sensors by UV exposure times were measured 0.48 nm/sec, 0.757 nm/sec, and ATR output power variations were measured $-0.424{\mu}W$/sec and $-0.62{\mu}W$/sec when UV exposure power were 3 mW and 5 mW, respectively.

나노구조 단분자막의 전기적 특성 (Electrical Characteristics of Nano-Structural Monolayer)

  • 최용성;조장훈;송진원;이경섭
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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    • pp.166-167
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    • 2006
  • Dendrimers represent a new class of synthetic macromolecules characterized by a regularly branched treelike structure. Multiple branching yields a large number of chain ends that distinguish dendrimers from conventional star-like polymers and microgels. The azobenzene dendrimer is one of the dendrimeric macromolecules that include the azo-group exhibiting a photochromic character. Due to the presence of the charge transfer element of the azo-group and its rod-shaped structure, these compounds are expected to have potential interest in electronics and photoelectronics, especially in nonlinear optics. In the present paper, we give pressure stimulation to organic thin films and detect the induced displacement current. Functional photoisometrization organic molecular the photo-stimulus to organic monomolecular L-films and LB films of dendrimer and 8A5H were performed. The 8A5H organic monolayer in case of pressure stimulus occurred that positive course but in case of the photo-stimulus compared positive and negative. It is assumed that generation forms of displacement current were measured when photo-stimulus for Impression.

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2,4-디메틸이미다졸환을 가지는 아조계 카디온염료의 포토크로미즘 (Photochromism of Cationic Azo Dyes Containing 2,4-Dimethylimidazole)

  • Cho, Myung Lae;Yoon, Nam Sik;Lim, Yong Jin
    • 한국염색가공학회지
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    • 제3권3호
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    • pp.1-5
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    • 1991
  • Cationic azo dyes were synthesized by coupling aniline and its derivatives with 2,4-dimethyl imidazole as a coupler, and their photochromic behavior was investigated. The dyes exhibited little photochromism on wool, but to a considerable degree on Dacron T92(anionic modified polyester), the photochromism being prominent for the dye with electron-releasing substituent on diazo component. Little photochromism on wool can be attributed to a decreased mobility of dye by the various interactions between the dye and wool molecules, which interferes the cis-trans isomeriation of dye. On Dacron T92 there can not be any obstacle for the cis-trans isomerization of dye, hence reversible color change may occur. The electron-releasing substituent on diazo component may be helpful for the photochromism of dye by increasing the n-electron density of phenyl ring, which can stabilize the cis-form of the dye by the interaction with the positive charge of imidazole ring.

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Displacement Properties of Nano Structure Dendrimer

  • Song Jin-Won;Lee Kyung-Sup;Lee Woo-Ki;Choi Young-Il;Yoon Suk-Am;Choi Chung-Seog
    • KIEE International Transactions on Electrophysics and Applications
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    • 제5C권1호
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    • pp.28-32
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    • 2005
  • In the Langmuir-Blodgett (LB) technique, a monolayer on the water surface is transferred onto a substrate, which is raised and dipped through the surface. From this, multilayers can be obtained in which constituent molecules are periodically arranged. The LB technique has attracted considerable interest in the fabrication of electrical and electronic devices. Many researchers have investigated the electrical properties of monolayer and multiplayer films. Dendrimers represent a new class of synthetic macromolecules characterized by a regularly branched treelike structure. Multiple branching yields a large number of chain ends that distinguish dendrimers from conventional star-like polymers and microgels. The azobenzene dendrimer is one of the dendritic macromolecules that include the azo-group exhibiting a photochromic character. Due to the presence of the charge transfer element of the azo-group and its rod-shaped structure, these compounds are expected to have potential interest in electronics and ptoelectronics, especially in nonlinear optics. In the present paper, we give pressure stimulation to organic thin films and detect the induced displacement current.

나노구조 덴드리머의 변위전류 특성 (Displacement Current Properties for Nano Structure Dendrimer)

  • 송진원;최용성;이우기;이경섭
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 영호남 합동 학술대회 및 춘계학술대회 논문집 센서 박막 기술교육
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    • pp.52-54
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    • 2006
  • In the Langmuir-Blodgett (LB) technique, a monolayer on the water surface is transferred onto a substrate, which is raised and dipped through the surface. From this, multi layers can be obtained in which constituent molecules are periodically arranged. The LB technique has attracted considerable interest in the fabrication of electrical and electronic devices. Many researchers have investigated the electrical properties of monolayer and multiplayer films. Dendrimers represent a new class of synthetic macromolecules characterized by a regularly branched treelike structure. Multiple branching yields a large number of chain ends that distinguish dendrimers from conventional star-like polymers and microgels. The azobenzene dendrimer is one of the dendritic macromolecules that include the azo-group exhibiting a photochromic character. Due to the presence of the charge transfer element of the azo-group and its rod-shaped structure, these compounds are expected to have potential interest in electronics and ptoelectronics, especially in nonlinear optics. In the present paper, we give pressure stimulation to organic thin films and detect the induced displacement current.

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Solvatokinetic and Solvatochromic Behavior of Bis(indolinobenzospiropyranyl) Sulfide Derivatives in Various Solvents

  • Keum, Sam-Rok;Ku, Byung-Soo;Kim, Sang-Eun;Choi, Yoon-Ki;Kim, Sung-Hoon;Koh, Kwang-Nak
    • Bulletin of the Korean Chemical Society
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    • 제25권9호
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    • pp.1361-1365
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    • 2004
  • Solvatokinetic and solvatochromic behavior of bis(indolinobenzospiropyranyl) sulfide derivatives 1a-1c have been studied in various solvents. The marked negative solvatochromism is exhibited for 1a and 1b in the whole region of solvent polarity examined. Whereas, it is found only in the polar solvent region ($E_T$ > 37) for 1c. The sensitivity order to the solvent media (slope values) is 1a > 1b > 1c. The branched linear plot with a zero slope was shown for the most sterically-hindered compound 1c in the less polar-solvent region (($E_T$ < 37). The biphasic plot is indicative of dual mechanistic process, i.e., a transition state with increased zwitter-ionic character in more polar solvents and electrocyclic process with an isopolar transition state in less polar solvents.