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Synthesis of Carbon Black Modified and Their Carbon Color
Park Sooyoul,Lee Byungmin 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
Due to the variety of shape and size of carbon black particles, carbon black can exhibit a range of color properties. The primary particle size, surface area and aggregate size determines the ultimate color with the dispersability of carbon black. An important property of carbon black is its ability to modify the visual appearance of other colors. The tinting strength is a measure of the effectiveness of the carbon black. In our works, carbon black was surface-modified to introduce hydroxyl groups or carboxyl groups such as organic acids (nitric acid, sulfonic acid) on the surface. The surface-modification of carbon black was confirmed by FTIR. Also, color properties of carbon black are measured using colorimeters and have values of L, a*, b*. The “Lab” value can be correlated to the ratio of particle size to surface area and is a useful tool for comparing competitive grades of carbon black. In now, carbon black is used in inkjet printer ink, reinforcements for natural and synthetic rubber, paints, coatings, cosmetics as a color materials.
Donor-Acceptor 발색단과 디케토피롤로피롤(DPP) 유도체에 관한 연구
김헌수(HunSoo Kim),김승회(SeungHoi Kim),박수열(SooYoul Park) 한국트라이볼로지학회 2016 한국윤활학회지(윤활학회지) Vol.32 No.5
The diketopyrrolopyrrole (DPP) pigment is a bicyclic 8-π-electron system containing two lactam units. Typical DPP derivative pigments have melting points of over 350℃ and very low solubility in most solvents, and show absorption in the visible region with a molar extinction coefficient of 33,000 dm²mol<SUP>-1</SUP> and strong photoluminescence with maxima in the range 500–600 nm. X-ray structure analyses of DPP show that the whole molecule is almost in one plane. The phenyl rings are twisted out of the heterocyclic plane and the intermolecular hydrogen bonding between neighboring lactam NH and carbonyl units influences the structure of the DPP pigment in the solid state. In this study, mono-N-alkylation and mono-N-arylation were undertaken for Pigment Red 264 or Pigment Orange 73 with alkyl halide and aryl halide, respectively, in the presence of sodium tert-butoxide as a base catalyst to improve the solubility of DPP pigments and their application as CO₂ indicators. The synthetic yield was in the range 11–88%. The indicator dyes are highly soluble in organic solvents and shows pHdependent absorption (λmax 501 and 572 nm for the protonated and deprotonated forms, respectively) and emission (λmax 524 and 605 nm for the protonated and deprotonated forms, respectively) spectra. The mono-Nalkylated and mono-N-arylated DPP pigment was identified by ¹H-NMR (¹H-Nuclear Magnetic Resonance Spectrometer), FT-IR (Fourier Transform Infrared Spectroscopy), and MS (Mass Spectrometry). According to the results of color and hue properties obtained by a color matching analyzer, the synthesized DPP pigment material can be used as a CO₂ indicator.