• Title, Summary, Keyword: organic dyes

Search Result 194, Processing Time 0.035 seconds

Application of Wool Dyes for Hair Dyeing (양모용 염료의 염모제 적용성 연구)

  • Chae, Da Eun;Lee, Eunkyo;Kim, Yewon;Seo, Dongwan;Oh, Nahyun;Koh, Joonseok
    • Textile Coloration and Finishing
    • /
    • v.32 no.1
    • /
    • pp.27-37
    • /
    • 2020
  • Low temperature dyeing properties of wool with reactive dyes and acid dyes were investigated for the feasibility study of their application to hair dyeing. The low temperature(30℃, 40℃) dyeing achieved light depth of shade in wool dyeing and reactive dyeing exhibited relatively higher color strength and chroma values than acid dyeing. Leveling agent slightly improved the levelness of the wool dyeing and the leveling properties of dyed wool at low temperature were good to excellent, irrespective of the dyes applied. Color loss during the repeated shampooing was in the range of 9.6~22.2% for reactive dyes and -7.4~31.5% for acid dyes and in some cases, the color fastness to shampooing was reasonable level. The overall experimental results showed that the application of low temperature wool reactive dyeing to hair dyeing is sufficiently feasible in terms of dyeability and color fastness to shampooing.

Highly Efficient and Stable Organic Photo-Sensitizers based on Triphenylamine with Multi-anchoring Chromophore for Dye-sensitized Solar Cells (트리페닐아민을 이용한 염료감응형 태양전지 고효율 염료합성)

  • Yang, Hyunsik;Jung, Daeyoung;Jung, Miran;Kim, Jaehong
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.88.1-88.1
    • /
    • 2010
  • Organic dyes, because of their many advantages, such as high molar extinction coefficients, convenience of customized molecular design for desired photophysical and photochemical properties, inexpensiveness with no transition metals contained, and environment-friendliness, are suitable as photosensitizers for the Dye-sensitized Solar Cell (DSSC). The efficiency of DSSC based on metal-free organic dyes is known to be much lower than that of Ru dyes generally, but a high solar energy-to-electricity conversion efficiency of up to 8% in full sunlight has been achieved by Ito et al. using an indoline dye. This result suggests that smartly designed and synthesized metal-free organic dyes are also highly competitive candidates for photosensitizers of DSSCs with their advantages mentioned above. Recently, the performance of DSSC based on metal-free organic dyes has been remarkably improved by several groups. We had reported the novel organic dye with double electron acceptor chromophore, which was a new strategy to design an efficient photosensitizer for DSSC. To verify the strategy, we synthesized organic dyes whose geometries, electronic structures and optical properties were derived from preceding density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations. In this paper, we successfully synthesized the chromophore containing multi-acceptor push-pull system from triphenylamine with thiophene moieties as a bridge unit. Organic dyes with a single electron acceptor and double acceptor system were also synthesized for comparison purposes. The photovoltaic performances of these dyes were compared, and the recombination dark current curves and the incident photon-to-current (IPCE) efficiencies were also measured in order to characterize the effects of the multi-anchoring groups on the open-circuit voltage and the short-circuit current. In order to match specifications required for practical applications to be implemented outdoors, light soaking and thermal stability tests of these DSSCs, performed under $100mWcm^{-2}$ and $60^{\circ}C$ for 1000h.

  • PDF

The Fabrication and an Analysis on the characteristics of Red OLED by various Organic Dyes (유기물 색소에 따른 적색 유기 발광 소자의 제작 및 특성 분석)

  • 최상건;이무상;노병규;오환술
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.265-268
    • /
    • 2000
  • Organic electroluminescent(EL) devices have been expected to be useful in novel-type flat-panel displays. This paper has fabricated and analyzed a red organic EL device with the use of organic dyes, such as DCMI and Nile Red. In this paper, the light emitting layer consists of tris-(8-hydroxyquiniline) aluminum(Alq$_3$) doped with organic dyes.

  • PDF

Organic Sensitizers based on Bis-carbazole for Dye-Sensitized Solar Cells (비스-카바졸 유기염료를 이용한 염료감응태양전지)

  • Kim, Hyo-Jeong;Byun, Yeo-Jin;Nam, Jung-Eun;Kim, Dae-Hwan;Kang, Jin-Kyu
    • 한국태양에너지학회:학술대회논문집
    • /
    • /
    • pp.397-399
    • /
    • 2012
  • Dye-sensitized solar cells (DSSCs) have received considerable attention as the most promising candidates for renewable energy systems in recent years. Among these, organic dyes which have many advantages such as large absorption coefficients, customized molecular design for desired photophysical and photochemical properties, inexpensiveness and environment-friendliness, are suitable as photosensitizers for DSSCs. We have studied on the design and synthesis of two organic dyes (BECZ 1 and BECZ 2) with a 9-ethyl-9H-carbazole core for dye-sensitized solar cells (DSSCs). Two organic dyes comprised of two 9-ethyl-9H-carbazole moiety as electron-donor, two types of cyanoacrylic acid moiety acting as acceptor. In addition, n-ethyl unit introduced for increasing the solubility and the donating power. The obtained organic dyes were comprehensively characterized by NMR, GC-MS, FAB-MS and UV/Vis spectroscopies. DSSCs sensitized by the dyes BECZ1 and BECZ2 produced ${\eta}$ value 3.31% and a ${\eta}$ value 3.21%.

  • PDF

Density Functional Theory Study on D-π-A-type Organic Dyes Containing Different Electron-Donors for Dye-Sensitized Solar Cells

  • Song, Jing;Xu, Jie
    • Bulletin of the Korean Chemical Society
    • /
    • v.34 no.11
    • /
    • pp.3211-3217
    • /
    • 2013
  • Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of three D-${\pi}$-A-type organic dyes (C1-1, D5 and TH208) containing identical ${\pi}$-spacers and electron acceptors, but different aromatic amine electron-donating groups (tetrahydroquinoline, triphenylamine and phenothiazine). The coplanar geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating ability of tetrahydroquinoline is stronger than those of triphenylamine and phenothiazine. The computed orbital energy levels of these dyes confirm that the electrons could be injected from the excited dyes to the semiconductor conduction band and the oxidized dyes could be reduced effectively by electrolyte. The TD-DFT results show that the CAM-B3LYP/6-31+G(d, p) is suitable for calculating the absorption spectra. The first absorption band for these dyes is assigned to the HOMO${\rightarrow}$LUMO and HOMO-1${\rightarrow}$LUMO transitions.

CdS Nanoparticles as Efficient Fluorescence Resonance Energy Transfer Donors for Various Organic Dyes in an Aqueous Solution

  • Ock, Kwang-Su;Ganbold, Erdene-Ochir;Jeong, Sae-Ro-Mi;Seo, Ji-Hye;Joo, Sang-Woo
    • Bulletin of the Korean Chemical Society
    • /
    • v.32 no.10
    • /
    • pp.3610-3613
    • /
    • 2011
  • CdS nanoparticles (NPs) were synthesized in an aqueous phase in order to investigate their spectral behaviors as efficient fluorescence resonance energy transfer (FRET) donors for various organic dye acceptors. Our prepared CdS NPs exhibiting strong and broad emission spectra between 480-520 nm were able to transfer energy in a wide wavelength region from green to red fluorescence dyes. Rhodamine 6G (Rh6G), rhodamine B (RhB), and sulforhodamine 101 acid (Texas red) were tested as acceptors of the energy transfer from the CdS NPs. The three dyes and synthesized CdS NPs exhibited good FRET behaviors as acceptors and donors, respectively. Energy transfers from the CdS NPs and organic Cy3 dye were compared to the same acceptor Texas red dye at different concentrations. Our prepared CdS NPs appeared to exhibit better FRET behaviors comparable to those of the Cy3 dye. These CdS NPs in an aqueous solution may be efficient FRET donors for various organic dyes in a wide wavelength range between green and red colors.

Preparation of Graphene-BiOCl/Fe3O4 Nanocomposites and Their Use as Photocatalysts for Organic Dyes Degradation

  • Zhang, Fuyong;Ko, Weon Bae
    • Elastomers and Composites
    • /
    • v.52 no.1
    • /
    • pp.9-16
    • /
    • 2017
  • Graphene-$BiOCl/Fe_3O_4$ nanocomposites were synthesized from $BiOCl/Fe_3O_4$ and graphene in an electric furnace operating at $700^{\circ}C$ for 12 h. The nanocomposite surface morphology and crystal structure were characterized by scanning electron microscopy and X-ray diffraction. The produced graphene-$BiOCl/Fe_3O_4$ nanocomposites acted as efficient heterogeneous photocatalysts for the degradation of organic dyes, as confirmed by UV-vis spectrophotometry.

Photodegradation of organic dyes via competitive direct reduction/indirect oxidation on InSnS2 under visible light

  • Park, Sungmook;Kim, Woocheol;Kim, Younghun
    • The Korean Journal of Chemical Engineering
    • /
    • v.34 no.5
    • /
    • pp.1500-1503
    • /
    • 2017
  • A visible-light-responsive photocatalyst, $SnS_2$, was prepared by a rapid microwave-assisted method. This photocatalyst showed a narrow band gap (~2.0 eV) and a broad-spectrum response in the range of 400-800 nm. To enhance its photocatalytic activity, the surface of $SnS_2$ was modified with indium-doping and loading of a noble metal. The photocatalytic activity of $SnS_2$, $InSnS_2$, and $Pt/InSnS_2$ was evaluated by photodegradation of methyl orange (MO) and rhodamine B (RhB) under visible light. While direct reduction via a photoelectron was the major reaction in the degradation of MO, indirect oxidation (deethylation) via reactive oxygen species (${\cdot}OH$ and ${\cdot}O_2^-$) in the degradation of RhB was accompanied subsequently with direct reduction (cycloreversion). Therefore, photocatalytic efficiency and the mechanism for photodegradation of organic dyes depended on the types of organic dyes.

The Photocatalytic Decomposition of Different Organic Dyes under UV Irradiation with and without H2O2 on Fe-ACF/TiO2 Photocatalysts

  • Zhang, Kan;Oh, Won-Chun
    • Journal of the Korean Ceramic Society
    • /
    • v.46 no.6
    • /
    • pp.561-567
    • /
    • 2009
  • The Fe-ACF/$TiO_2$ composites were prepared by a sol-gel method and were characterized by nitrogen adsorption, Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Energy Dispersive X-ray (EDX). The Fe-ACF/$TiO_2$ composites were developed for the decomposition of organic dyes by using a UV lamp. The decomposition effect was investigated under various conditions, such as three selected non-biodegradable organic dyes like Methylene Blue (MB), Methyl Orange (MO), Rhodamine B (Rh.B), and in the presence of Fe and hydrogen peroxide ($H_2O_2$). The photocatalytic activity was derived from possible combination effects, such as (1) adsorption of ACF, (2) generation of electron/hole by $TiO_2$, (3) photo-Fenton reaction of Fe, and (4) oxidation of $Fe^{2+}\;to\;Fe^{3+}\;by\;H_2O_2$.

Analysis of Dye Aggregation Using NNMF Algorithm(I) - Acid Dyes in an Aqueous Solution - (NNMF 알고리즘을 이용한 염료 회합의 분석(I) - 수용액에서 산성염료의 회합 -)

  • Kim, Hye-Hyeong;Park, Chul-Kwon;Cho, Hyeon-Tae
    • Textile Science and Engineering
    • /
    • v.49 no.2
    • /
    • pp.75-81
    • /
    • 2012
  • It has been known that the absorption spectra of aqueous organic dye solutions tends to deviate from the Lambert-Beer law depending on solution conditions, which is considered to be mainly due to the dye aggregation caused by the intermolecular interaction among dyes. In this study, the visible spectra regarding two types of acid dyes in an aqueous solution, as well as the levelling type and milling type of acid dyes, were measured under different solution conditions such as changes of dye concentration and temperature. The non-negative matrix factorization (NNMF) method was adopted for the spectrum analysis. With the NNMF algorithm, several types of spectra caused by the dye aggregation could be measured and quantitative analysis for the dye aggregation was possible. When the concentration regarding the dye or dye solution temperature was changed, the two types of dye showed quite different aggregation behaviors which can be discussed with the hydrophobic property of the dyes.