• 한국전기전자재료학회논문지
• /
• 제20권5호
• /
• pp.450-455
• /
• 2007

LCD color filters have been manufactured in a process called photolithography to date, but various printing methods have been studied currently in response to the trend of low-end LCD panels. Direct Printing Process is a suitable fabrication technique to develope pigment components whose dimensions are in nano. The success of this process depends on the systematic preparation of pigment millbase. Conventional millbase dispersions are constituted of the organic pigments, monomer, dispersant and solvents. An experimental study on the rheology of millbase dispersions is presented. Subsequently, this thesis attempts to find out the dispersive characteristics as well as the selection of pigments, monomers and dispersants in the part of millbase among the stages of manufacturing LCD color filters using the direct printing methods. The dispersive characteristics were shown through analytic devices such as PSA, Rheometer, etc.

• 한국염색가공학회지
• /
• 제31권4호
• /
• pp.233-240
• /
• 2019

Dyeing is an essential process for improving the value of textile products, but it is considered as one of industries causing pollution because of producing wastewater containing hazardous chemicals as well as using a large amount of water and energy. Global demand for greener technologies in textile field is getting much more attention and accordingly, the use of eco-friendly natural dyes is growing much larger. In textile printing, both dyes and pigments can be used. Pigment printing is more simple process and requires less water and less energy, compared to dye printing. In this study, the organic pigment was prepared from the marigold colorant. Samples were stencil printed, pressed(70℃, 3min) and then heat treated(150℃, 5min). The uptake of polyacrylic acid as a chemical binder was the lowest. In particular, marigold pigments were excellent in color and texture when Guar Gum and Sodium Alginate were used as binders. In addition, the light and washing fastness was rated very high as 4, 4/5 grades, and the rubbing fastness was also excellent as 3 and 4 grades.

• 한국세라믹학회지
• /
• 제55권5호
• /
• pp.461-472
• /
• 2018

$Gd_2O_3:Eu/Bi$ nanoparticles were synthesized via spray pyrolysis and applied for the preparation of a luminescent pearl pigment as an anti-counterfeiting material. The luminescence properties were optimized by changing the $Eu^{3+}$ and $Bi^{3+}$ concentration. Ethylene glycol was used as an organic additive to prepare the $Gd_2O_3:Eu/Bi$ nanoparticles. The highest emission intensity was achieved when the total dopant content was 10.0 at.% and the mole fraction of Bi was 0.1. The concentration quenching was mainly due to dipole-dipole interactions between the same activators, and the critical distances were 9.0 and $19.6{\AA}$ for $Eu^{3+}$ and $Bi^{3+}$, respectively. The prepared $Gd_2O_3:Eu/Bi$ powder exhibited an average size of approximately 82.5 nm and a narrow size distribution. Finally, the $Gd_2O_3:Eu/Bi$ nanophosphor coated on the surface of the pearl pigment was confirmed to have good red emission under irradiation from a portable ultraviolet light-emitting diode lamp (365 nm).

• Tribology and Lubricants
• /
• 제32권5호
• /
• pp.141-146
• /
• 2016

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°C and very low solubility in most solvents, and show absorption in the visible region with a molar extinction coefficient of 33,000 dm²mol⁻¹ 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 pH-dependent absorption (λ_max 501 and 572 nm for the protonated and deprotonated forms, respectively) and emission (λ_max 524 and 605 nm for the protonated and deprotonated forms, respectively) spectra. The mono-N-alkylated 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.

• 공업화학
• /
• 제28권1호
• /
• pp.95-100
• /
• 2017

본 연구에서는 Pigment Red 57:1의 다양한 합성 방법에 따른 입자 거동 및 그의 따른 색상, 점도, 및 분광학적 특성 등을 분석하기 위하여, 합성 시간, pH, 유도체 함량 및 결정화 온도 등의 변수를 이용하여 시료를 합성한 후 그 분산액을 제조하였으며, 그에 따른 특성을 비교 분석하였다. 시료들의 특성은 푸리에 적외선 분광기, UV-Vis 분광기, 입도 분석기, 색차계, X선 회절 분석계 등을 이용하여 비교 분석하였다. 그 결과 합성 조건 조절을 통하여 안료 입자의 크기를 다양하게 조절하는 것이 가능하였다.

• 한국식품영양과학회지
• /
• 제38권7호
• /
• pp.885-891
• /
• 2009

퉁퉁마디의 적자색 색소의 안정성에 대한 pH, 당, 유기산, ascorbic acid, 아미노산, 식염 및 온도의 영향을 조사하였다. 퉁퉁마디 적자색 색소는 pH $4{\sim}6$ 범위에서 가장 안정하였으며, 저장기간에 따른 퉁퉁마디 적자색 색소의 잔존율은 다양한 당 첨가에 의해 대조구에 비해 높았다. 특히, 저장기간 10일 경과 후 0.5 M sucrose를 첨가한 시료구는 대조구에 비해 약 11.1% 가량 색소 잔존율이 높았으며 다음으로 fructose, maltose, glucose, galactose 순이었다. 또한, 유기산의 첨가로 종류와 농도에 관계없이 모두 대조구에 비해 저장기간 중 퉁퉁마디 적자색 색소의 잔존율을 감소시켰으며 특히, 유기산의 농도를 0.5 M로 가장 높게 처리한 시료구의 색소잔존율이 저장 10일 후 $13.1{\sim}15.9%$로 크게 감소하였다. 저장기간 10일 경과 후 ascorbic acid와 thio urea를 동시에 1,000 ppm씩 첨가한 경우 저장 10일 경과 색소의 잔존율이 48.4%로 대조구에 비해 약 23.1% 가량 높았다. 또한 아미노산 중에서는 aspartic acid를 50 mM 처리 시 색소 잔존율이 41.5%로 가장 높았으며 식염의 농도를 2.0 M 처리 시 색소의 잔존율이 31.6%로 대조구에 비해 높았다. $5^{\circ}C$와 $25^{\circ}C$ 등 저온저장의 경우 색소의 안정성이 유지된 반면 저장온도가 상승함에 따라 색소의 안정성은 급격히 감소하였다.

• 한국인쇄학회지
• /
• 제13권2호
• /
• pp.33-45
• /
• 1995

1, 4-Diketo-3, 6-diphenyl-pyrrolo-[3, 4c]-pyrrole(abbriviated DPP) is a new heterocyclic pigment of red color whose chlorinated derivative is now on the market. DDP was synthesized from benzonitrile and diethylsuccinate. Pariser-parr-pople(PPP) molecular orbital calculations have been carried out on the DPP in other to study spectroscopically the DPP chromophore on deprotonation.

• 한국세라믹학회:학술대회논문집
• /
• 한국세라믹학회 2003년도 추계총회 및 연구발표회 초록집
• /
• pp.137.2-137
• /
• 2003

• 한국펄프종이공학회:학술대회논문집
• /
• 한국펄프종이공학회 2008년도 춘계학술대회
• /
• pp.170-176
• /
• 2008

• ALGAE
• /
• 제36권3호
• /
• pp.195-206
• /
• 2021

Increasing inputs of dissolved organic matter (DOM) to northern lakes is resulting in 'lake browning.' Lake browning profoundly affects phytoplankton community composition by modifying two important environmental drivers-light and nutrients. The impact of increased DOM on native isolates of red and green-pigmented cyanobacteria identified as Pseudanabaena, which emerged from a Dolichospermum bloom (Dickson Lake, Algonquin Provincial Park, Ontario, Canada) in 2015, were examined under controlled laboratory conditions. The genomes were sequenced to identify phylogenetic relatedness and physiological similarities, and the physical and chemical effects of increased DOM on cellular performance and competitiveness were assessed. Our study findings were that the isolated red and green phenotypes are two distinct species belonging to the genus Pseudanabaena; that both isolates remained physiologically unaffected when grown independently under defined DOM regimes; and that neither red nor green phenotype achieved a competitive advantage when grown together under defined DOM regimes. While photosynthetic pigment diversity among phytoplankton offers niche-differentiation opportunities, the results of this study illustrate the coexistence of two distinct photosynthetic pigment phenotypes under increasing DOM conditions.