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pISSN : 1229-0033 / eISSN : 2234-036X

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2014, Vol.26, No.4

  • 1.

    Efficient Fluorescence Quenching of tert-butyl substituted Phthalocyanines with Picric Acid

    Ankush Gupta | 김미나 | Jong Seung Park | 2014, 26(4) | pp.277~282 | number of Cited : 1
    Abstract PDF
    Two tert-butyl substituted phthalocyanines(Pcs), in metal-free and metallated forms, were synthesized and the fluorescence responses toward various nitro derivatives, including picric acid(PA), 2,4-dinitrotoluene(DNT), 1,4-dinitrobenzene(DNB), 4-nitrotoluene(NT), nitrobenzene(NB), 1,4-benzoquinone(BQ), and nitromethane(NM) were investigated. Among the various nitro derivatives, current Pc derivatives exhibited efficient and exclusive fluorescence quenching in the presence of picric acid, which was readily observed by a naked eye. Quenching efficiency was estimated by the Stern-Volmer relationship, in which quenching constant, KSV, was calculated to be in the range of 104M-1. It was also found out that the aggregational behaviors of these Pcs are heavily dependent on the nature of solvent systems, subsequently affecting the quenching efficiency.
  • 2.

    Reactive Dyeing of Bio Pretreated Cotton Knitted Fabrics

    Alvira Ayoub | Son, Eun-Jong | Sunghoon Jeong and 1other persons | 2014, 26(4) | pp.283~289 | number of Cited : 0
    Abstract PDF
    This study describes the feasibility and optimization of reactive dyeing on bio treated cotton knitted fabrics. For this, cotton knitted fabrics distinctly with two different enzymes, alkaline Pectinases(Scourzyme L®) and Pectate lyases(Bactosol Co. ip liquor®). In this way by increasing the concentration and processing temperature, the access of enzymes towards the fatty and waxy substrate was found to be accelerated. To achieve higher absorbency and whiteness index, a series of experiments was carried out to assure that Pectate lyases enzymes possesses high access towards the fats and waxes at high temperature. To this end, cotton knitted fabrics was dyed without oxidative bleaching step. The Pectate lyases scoured and dyed fabrics showed less color difference when 2% dye shade is used. The fabrics pre-scoured with Pectate lyases showed good the light and washing fastness properties, compared to the conventional and Pectinases dyed fabrics. However pectinases enzymes showed lower activity at high temperature, caused poor wettability and whiteness index of fabrics. The improvement of the accessibility of enzyme to the pectin at higher temperature Pectate lyases treatment before dyeing was found to be useful for subsequent pectin degradation in cotton knitted fabrics.
  • 3.

    Synthesis and Application of Color Depth Black Disperse Dyes for PET Fabric

    김혜진 | Manwoo Huh | 김재호 and 5other persons | 2014, 26(4) | pp.290~296 | number of Cited : 1
    Abstract PDF
    In order to produce black disperse dye which has high heat resistance and depth color for polyester(PET), an orange disperse dye was designed and synthesized with pyridine based derivatives to get high heat resistance. Disperse blue dye adopts heterocycles structure for high molar extinction coefficient and long wavelength absorption. Synthesized disperse dye is micronized to an particle size of 0.7㎛. The mixing condition for black color using commercial disperse violet 93 is blue dye 30%, red dye 21%, and orange dye 21%, respectively. Dyed PET fabric with synthesized dye has quiet good color fastness to sublimation(grade 3-4) and has excellent rubbing, washing and light fastness grade 4-5.
  • 4.

    Relationship between the Adsorption of Dye and the Surface Charge Density of Silica Sol

    조경숙 | Seung-Ho Lee | 이동현 and 2other persons | 2014, 26(4) | pp.297~304 | number of Cited : 2
    Abstract PDF
    In this study, we investigated the relationship between the adsorption property of Methyl violet or Tartrazine dye onto silica sol surface and surface charge density of the sol. The adsorption ratio of Methyl violet dye on silica sol decreased to 74% and 92% for the 68nm and 94nm silica sol, respectively, at dye concentration of 175μg/m2. However, the adsorption ratio of Tartrazine dye on 68nm and 94nm silica sol was about 0% for both of them. The surface charge density is –0.40C/m2, -0.26C/m2 for 68nm and 94nm silica sol, respectively. The amount of Methyl violet dye adsorbed on silica sol increased with an increase of surface charge density of particle at the same concentration of the dye. The adsorbed amount of the silica having high surface charge density is larger at high pH domain. But adsorbed amount of the silica having low surface charge density is larger at low pH domain.
  • 5.

    Synthesis and Property of Pyrene-Naphthalene Diimide-Pyrene Triad

    김현지 | Jong Seung Park | 김아롱 | 2014, 26(4) | pp.305~310 | number of Cited : 0
    Abstract PDF
    In this study, we presented a newly synthesized pyrene-naphthalene diimide (NDI)-pyrene triad. The optical and structural properties were examined using various characterization techniques. A donor-acceptor-donor triad molecule exhibited a strong charge transfer, though there existed neither intramolecular nor intermolecular hydrogen bonding sites, due to the formation of preferential complementary complex between pyrene and NDI. Powder XRD measurement revealed a sharp and distinctive X-ray patterns, indicating the presence of microcrystalline-like structure. POM images showed anisotropic fingerprint texture similar to that of cholesteric phase, and SEM images showed numerous columnar structures with length of 1 to 10μm. Above observation clearly demonstrated that π-complementary NDI-pyrene interactions in the traid was strong enough to form columnar aggregates in the long range.
  • 6.

    Preparation, Physical Characteristics and Antibacterial Finishing of PCM/Nylon Fibers having Sheath/Core Structure

    김학수 | Young-A Son | 황지용 and 2other persons | 2014, 26(4) | pp.311~321 | number of Cited : 1
    Abstract PDF
    In this study, Aftertreatment properties of PCM/Nylon sheath/core fabrics have been determined. Especially, the relationship between finishing property and content including of PCM ratio. Samples of PCM/Nylon fabrics were monitored, separately, with 2% o.w.f solutions of each of the berberine chloride, cetylpyridinium chloride(CPC), benzyldimethylhexadecyl ammonium chloride(BDHAC) and dodecyltrimetyl ammonium bromide(DTAB). Various temperatures and liquor ratio and pH conditions were also studied to optimize aftertreatment properties. Berberine chloride finished sample showed the good color fastness. Cetylpyridinium chloride(CPC) finished sample showed very effective antibacterial properties against Staphylococcus aureus and Klebsiella pneumoniae.
  • 7.

    Property Evaluation of Breathable Blend Fabric of MPCE Copolymer and Wet Coagulated Polyurethane

    이종우 | Jin-Seok Bae | 채애정 | 2014, 26(4) | pp.322~330 | number of Cited : 2
    Abstract PDF
    The phospholipid-based MPCE(2-Methacryloxyethyl Phosphoryl Chlorine) copolymer was mixed with wet polyurethane for coating of nylon fabrics. The substitution rate of water in coagulation bath with DMF was changed under control of the size of formed hydrophilic microporous cell enable to manufacture excellent breathable, anti-bacterial and moisture control fabrics. Biocompatible property, vapor permeability, hydrostatic pressure, moisture management and anti-bacterial property were investigated for treated nylon fabrics. In result, increased moisture transmission rates, decreased water resistance and outstanding moisture control property could be confirmed by enhanced hydrophilicity of wet-coated nylon fabric with MPCE copolymer.
  • 8.

    The Mechanical Properties and Alkali Hydrolysis on Composition Ratio of Nylon 6-Polyester Split-type Yarn

    Park,Myung-Su | 2014, 26(4) | pp.331~338 | number of Cited : 2
    Abstract PDF
    In this research, split-type complex yarn of 20:80, 40:60, 50:50 nylon6/polyester composition ratio was used in order to impose unique sense on split-type complex woven. After treating both split-type complex yarn of each ratio and its produced woven in alkali solution, we got the following results by checking physical properties based on alkali proportion and treatment time. Under the condition of NaOH 20% in this experiment, it took approximately double time 20% loss of weight. The loss of weight became high when polyester proportion of N/P(nylon6/polyester) composition ratio was low, in the same fineness yarn. Even though polyester proportion was low, the loss of weight was low when the fineness was high. N/P division was well processed at about 25% loss of weight under the condition of NaOH 20%, treatment temperature 50℃, and treatment time 60 minutes. The research provides that the loss of weight should be processed around treatment time 24 hours in the case of NaOH concentration 15%, and treatment time 15 hours in the case of NaOH concentration 18%, respectively, in order to achieve N/P woven division ratio of about 70%-80% in industrial fields.
  • 9.

    Effects of Surfactants on Dispersion Behavior of Vectran® in Water -Evaluation of Fibers Dispersion Behavior in Water with Quadrat Analysis-

    강유정 | Jin-Seok Bae | 이도현 and 1other persons | 2014, 26(4) | pp.339~346 | number of Cited : 2
    Abstract PDF
    To give a positive effect on dispersion behavior of high performance fibers Vectran® in water with reference to wet-laid nonwoven technology, 9 kinds of sulfonate type anionic surfactants were chosen to study. After dispersion experiment, the number and the area occupied by fibers in each sample were counted and figured to calculate the index of dispersion in conjunction with quadrat analysis. Similar tendency was observed in the results of two experiments. The sample without addition of any surfactant resulted in the most aggregated dispersion behavior. As the length of alkyl group attached to sulfonate increases, the sample shows more dispersed behavior. The sample with the surfactant having the aryl group and the longer alkyl group shows the most dispersed behavior and it can be seen with the naked eye as well.
  • 10.

    Nanostructure and Thermal Effects Dependent on the Film Thickness in Poly(3-hexylthiophene):Phenyl-C61-butyric Acid Methyl Ester(P3HT:PCBM) Films Fabricated by 1,2-Dichlorobenzene Solvent for Organic Photovoltaics

    Lee, Hyun Hwi | Hyo Jung Kim | 2014, 26(4) | pp.347~352 | number of Cited : 0
    Abstract PDF
    Film thickness dependent nanostructure evolution by a post annealing was investigated in poly (3-hexylthiophene):phenyl-C61-butyric acid methyl ester(P3HT:PCBM) films for organic solar cells which were fabricated by dichlorobenzene(DCB) solvent. In case of a 70nm thin film, the thermal annealing process affected to slight increment of the P3HT crystals in the surface region. On the other hand, large number of small sized P3HT crystals near the surface region was formed in the 200nm thick film. The solar cell devices showed the 3% power conversion efficiency(PCE) in 1:0.65 and 1:1 ratio(by weight) of P3HT and PCBM in 70nm and 200nm thickness conditions, respectively. Despite to the similar PCE, the short circuit current Jsc was different in 70nm and 200nm devices, which was related to the different nanostructure of P3HT:PCBM after thermal annealing.
  • 11.

    A Study of Effects of Fermented Green Tea Extract-based Treatment on Hair

    박귀희 | Im soon yea | 2014, 26(4) | pp.353~362 | number of Cited : 4
    Abstract PDF
    This study attempted to determine the effects of fermented green tea extracts on hair by using them in a perm. For this, hair is bleached, and then the fermented green tea extracts and water were supplied to the hair using a mist sprayer. Then the hair was permed, and hair damage was tested. Regarding hair moisture levels and wave formation, specifically, the morphological changes of hair were investigated with the Scanning Electron Microscope(SEM). The study results found the following. In terms of wave formation, the fermented green tea extract-based perm was much better than the general perm. In addition, hair bleaching was more serious in the latter. According to analysis on hair moisture using SEM, hair damage was more prevalent in the general perm as well. Therefore, it was confirmed that green tea extract-based perms cause less damage to the cuticle. In other words, the potential of fermented green tea extracts as a hair cosmetics material was discovered. Furthermore, it appears that the study results contribute to the development of low-irritating scalp and hair care products using the anti-inflammatory and antimicrobial properties of the fermented green tea extracts.