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RISS 인기검색어
- 검색키워드
- 저자 : 차희철(Hee Cheol Cha) (검색결과 6 건)
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차희철,고재훈,김영호,Cha, Hee-Cheol,Ko, Jae-Hoon,Kim, Young-Ho 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.4
Novel reactive dyes having antibacterial properties were synthesized by introducing sulfase, -$NHSO_2$-, which is well known as antibiotics to reactive dyes. An intermediate compound was prepared by a coupling reaction of the diazonium salt of sulfadiazine with the condensation product of 8-amino-1-naphthol-3,6-disulfonic acid (H-acid) and cyanuric chloride. A reaction of the intermediate compound and sodium 4-aminophenyl-${\beta}$-sulfatoethyl sulphonate (p-Base) afforded a new reactive red dye of monochlorotriazine type. To synthesize reactive blue dyes of vinyl sulfone type, another intermediate compound was prepared by a coupling reaction of the diazonium salt of p-Base with H-acid, followed by the second coupling reaction of the diazonium salt of sulfadiazine or silver sulfadiazine with the intermediate compound. The synthesized dyes were characterized using a high performance liquid chromatography and various spectroscopic analyses such as UV/Vis, FT-IR, energy dispersive X-Ray, and inductively coupled plasma.
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차희철,김영호,Cha, Hee-Cheol,Kim, Young-Ho 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.4
Dyeing properties of three sulfadiazine type reactive dyes (Re-Red, Re-Blue1, and Re-Blue2) synthesized newly from (silver) sulfadiazine, H-acid, and p-base were evaluated by dyeing cotton fabric with them. The synthesized reactive dyes showed somewhat lower build-up property and lower exhaustion ratio compared to those of a commercial dye. The fastness to light, washing, and crocking of the dyed cotton fabrics showed fairly good grade. However, the antimicrobial activities of the dyed fabrics tested using Staphylococcus aureus (AT.C.C. 6538) as a cultivating bacterium were excellent. The dyed fabrics also showed very good durability of the antibacterial activities to repeated launderings. Re-Blue1 synthesized from sulfadiazine is more effective than Re-Blue2 synthesized from silver sulfadiazine considering the manufacturing cost and antibacterial activity of the dyed fabric.
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설파디아진 은으로부터 항균 산성염료 및 분산염색용 항균 첨가제의 합성과 이들의 특성 분석
차희철,김영호,Cha, Hee Cheol,Kim, Young Ho 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.3
Two acid dyes having excellent antimicrobial activity were synthesized by using silver sulfadiazine, a well-known antibiotic, and 8-amino-1-naphthol-3,6-disulfonic acid (H-acid). The diazonium salt of silver sulfadiazine (S1) and the acetylated H-acid (H1) were prepared first, and then an antimicrobial red acid dye (Acid-Red) was synthesized via a coupling reaction of S1 and H1. An antimicrobial blue acid dye (Acid-Blue) was also synthesized by the successive coupling reactions of H-acid with the diazonium salt of aniline-2,5-disulfonic acid (B1) and the diazonium salt of sliver sulfadiazine (S1). Two colorless antimicrobial additives for disperse dyeing, Disperse-ES and Disperse-AS, were also synthesized by reacting silver sulfadiazine with diethyl sulfate and acetic anhydride, respectively. The synthesized antimicrobial dyes and additives were characterized by Fourier transform infrared (FT-IR), UV-vis, and energy dispersive X-ray (EDX) analyses. Although the nylon fabric dyed with either Acid-Red or Acid-Blue showed poor light fastness, it had good washing and crocking fastness. The nylon fabrics dyed with Acid-Red and Acid-Blue and polyethylene terephthalate (PET) fabrics treated with Disperse-ES or Disperse-AS showed excellent antimicrobial activities after 10 repeated launderings.
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편광현미경을 이용한 PTT/PTN 블렌드의 등온결정화 거동 분석
최재원,차희철,김영호,Choi, Jae-Won,Cha, Hee-Cheol,Kim, Young-Ho 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.6
Isothermal crystallization behaviors of poly(trimethylene terephthalate) (PTT), poly(trimethylene naphthalate) (PTN), and PTT/PTN blends were analyzed using a polarizing microscope equipped with a hot-stage. As the melting time at $260^{\circ}C$ of PTT/PTN blends increased, the crystallization proceeded slowly due to the copolymer formation which resulted from the ester interchange reaction at the elevated temperature. PTT and m-rich blends formed spherulites over the temperature range of experiment, but PTN formed spherulites only at lower crystallization temperatures such as $150^{\circ}C$. PTN and PTN-rich blends formed distorted spherulites at high temperatures such as $180^{\circ}C$, which seemed to result from the $\beta-crystal$ formation of PTN at that temperature. The radial growth rate of the spherulite formed during the crystallization was obtained by the measurement of radii of the spherulites. The radial growth rate decreased as PTN content in the blends increased.
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車喜澈,徐大圭 한양대학교 의과대학 1985 한양의대 학술지 Vol.5 No.1
An interaction between lymphocytes and tumor cells is essential in the defense against the growth of neoplastic cells in humans and animals. The contact between the lymphocyte and the neoplastic target cell is probably mediated by a sensitization of the lymphocyte to tumor specific antigens. The contact between the lymphocyte and the antigen is thought to be followed by a distortion of a recognition site of the lymphocyte membrane, initiating an intracellular chain reaction beginning with a rise in the activity of a membrane-bound adenosine triphosphatase (ATPaes). On the other hand, many investigations were carried out on the BCG and/or Picibanil inoculation for the treatment of cancer in humans and animals through stimulation of the reticuloendothelial system, which would result in an enhancement of lymphocyte related immunity. This work was designed to study the effects of Sarcoma 180 cell inoculation and immunotherapy with BCG and Picibanil alone or in combination with one another on the ATPase, acid phosphatase and alkaline phosphatase activities of mitochondrial fraction of spleen lymphocytes from normal and Sarcoma 180-bearing mice. The enzyme activities of these phosphatases were definitely higher in the Sarcoma mice than that of normal mice one week after the tumor cell inoculation. However, two weeks later, corresponding to the advanced stage of tumor, these enzyme activities were decreased to lower than that of the control mice in ATPase and acid phosphatase activities but still higher than control mice in alkaline phosphatase activity. Elevated enzyme activities were observed in both of normal and Sarcoma 180-bearing mice treated with BCG and with Picibanil in one and even two weeks after inoculation. Effects of BCG or Picibanil on enzymatic activities were more significant in Sarcoma mice than in normal. Treatment with BCG-Picibanil combination, however, showed no increse in enzyme activities but remarkable decrease than with BCG or Picibanil alone.
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