• Journal of the Korean Society of Clothing and Textiles
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• v.33 no.8
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• pp.1273-1279
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• 2009

This study examined the difference in the mechanical properties of cotton fabrics treated with nano silver. Nano silver powder, UV-absorber, and DMDHEU are applied to cotton fabrics. The reagents added in a finishing solution were Triton X-100 and $MgCl_2$ $6H_2O$. The mechanical properties of the fabrics were measured by KES-FB system. From these, the primary hand values were evaluated by the conversion equation (KN-202-DS). The results of this study are summarized as follows. The fabric tensile properties and bending properties are increased by the application of nano silver, DMDHEU, and UV-absorber mixed. The values of tensile properties in the warp direction were significantly lower than those in the weft direction. However, the values of bending properties in the warp direction were higher than those in the weft direction. The differences in the values of compression parameters by nano silver coating were unnoticeable. However, the compression energy and resilience of compression in each fabric was increased by DMDHEU treatment. The SMD values of cotton fabrics are decreased by nano silver, DMDHEU, and UV-absorber mixed treatment.

• Journal of Radiation Industry
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• v.4 no.1
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• pp.73-77
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• 2010

In recent day, there is much interest in the biocidal activity of silver since silver is known to be safe and effective as disinifectant and biocidal material against coliforms and viruses. In this study, hydrogels containing silver acetate as antibacterial agent have been prepared using gamma rays irradiation. The hydrogels are composed of poly(vinyl pyrrolidone) (PVP), poly(ethylene glycol) (PEG), carrageenan and silver acetate. The concentration of solution was 9 wt%. The ratio of PVP : PEG : carrageenan was 6 : 1 : 2. The concentration of the silver acetate were 0, 0.01, 0.03, 0.05 and 0.07% and Gamma irradiation dose was 25 kGy. The Gamma irradiation dose in hydrogels with 0.01% silver acetate were 20 kGy, 35 kGy, 50 kGy, 65 kGy, and 80 kGy. The results showed that 0.01% silver acetate concentration of hydrogels by 25 kGy irradiation dose showed the highest antibacterial activity against E. coli and Staphylococcus aureus. Moreover, antibacterial activity of various Gamma irradiation dose in hydrogels treated 0.01% silver acetate showed highest 35 kGy irradiation dose against Staphylococcus aureus.

• Bulletin of the Korean Chemical Society
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• v.35 no.11
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• pp.3209-3212
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• 2014

This paper describes a selective synthetic method of fabricating Ag nanowires by using a modified polyol process. To synthesize the Ag nanowire, an ethylene glycolic solution of silver nitrate and an ethylene glycolic solution of polyvinylpyrrolidone solution containing a small amount of organic oxidant, 1,4-benzoquinone, were slowly added to a hot ethylene glycol medium at $160^{\circ}C$ for 8 min using a syringe pump. The reaction mixtures were heated for an additional 45 min and cooled to room temperature. Finally, the silver nanomaterials were isolated from the mixture by centrifugation. The crystal structure of the nanomaterials was investigated by powder X-ray diffraction analyses, and their morphology was investigated by scanning electron microscopy. A small amount of organic oxidant, 1,4-benzoquinone, played a significant role in controlling the morphology during crystal growth. Consequently, Ag nanowires rather than Ag nanoparticles were selectively obtained.

• Food Science and Preservation
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• v.6 no.3
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• pp.286-291
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• 1999

This study was carried out to determine the effect of dose and timing of gamma irradiation and post-irradiation treatment with some preservatives of cut flowers on their longevity of rose and chrysanthemum. Cut roses which were soaked in 2% sugar solution persist to 0.75 kGy irradiation treatments. In post-treatments with some preservative solutions, the mixture group of 2% sucrose,2000m silver nitrate and 3.0% crysal were available in flower quality, but the 200 ppm silver nitrate solution treatment showed serious blackening of floral stems and resulted On negative effect in flower quality. Effect of gamma irradiation and all preservative solutions on the cut mum longevity were showed almost same tendency with rose cut flower longevity experiments. The 2% sugar dipping solution in mum cut flower showed the most superior preservative effect compared with the my other preservative solutions tested. Also non-irradiated treatment extended to flower up to complete wilt.

• Bulletin of the Korean Chemical Society
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• v.32 no.9
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• pp.3433-3436
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• 2011

Some of metal nanoparticles have the potential for use as colorimetric assays for estimating solution properties, such as pH and temperature due to localized surface plasmon (LSP) phenomena. This report describes the use of silver nanoparticles (AgNP) conjugated with cytochrome c (Cyt c) for the colorimetric determination of solution pHs. When the pH of a solution decreases, the Cyt c immobilized on the AgNP undergoes a conformational change, leading to a decrease in the interparticle distance between Cyt c-AgNP probes and consequent red-shift in LSP. As a result, the color of the Cyt c-AgNP probe solution changes from yellow to red and finally to a grayish blue in the pH range from 11 to 3. This gradual color change can be used to determine the pH of a solution over a wide pH range, compared to other colorimetric methods that use gold nanoparticles.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2011.04a
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• pp.220-225
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• 2011

The purpose of this study was to identify the lifestyle of babyboomer, the difference of recognition about silver town and preferable determinants according to lifestyle. By the Social Survey Research with questionnaire, data from 108 people of 46 years old ~ 65 years old who inhabited in Seoul City area were collected during October, 2010. Data were analyzed by the SPSS program Win 18.0, and frequency, percentage, t-test, ANOVA, factor analysis, regression were employed. The major findings were as follows. First, by the factors analysis on lifestyle, factors were named "interest about external", "inner-oriented", "pursuit of health", "prepare for later life", "social aspects". Second, by the frequency analysis on recognition about silver town, 97.2% of total respondents replied "at least heard about silver town", and 64.8% of total respondents recognized the necessity of silver town. While, intention to live in silver town was low (by 38.0% of total respondents). Third, by the regression analysis on preference tendency about silver town according to life style, factor of 'inner-oriented' in the decision about residential area and total household number, factor of 'pursuit of health' in the decision about monthly rent, factor of 'social aspects' in the decision about cost solution method were influential factors. In conclusion, to supply the house which had the diversity of baby bommer's life style, government and corporation's efforts to increase intention to live in silver town and to change the recognition about silver town are needed.

• Journal of the Microelectronics and Packaging Society
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• v.25 no.1
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• pp.11-15
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• 2018

In this study, we deposited silver nanoparticles on the nanocone array structure which was fabricated by the UV nanoimprint process for optical signal amplification. The deposition of the silver nanoparticles was based on the evaporation behavior of the solution droplet according to wettability of surface and the deposition pattern changed from the center of the droplet to the edge depending on the difference of thermal energy. The optical property of silver nanoparticles that were deposited on imprinted nanohole patterns was simulated by the Finite difference time domain (FDTD) analysis method, and it was confirmed that energy was concentrated around the silver nanoparticle of the finally fabricated structure.

• Journal of the Korean Chemical Society
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• v.29 no.2
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• pp.158-163
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• 1985

The anodic oxidations of the Silver(I) / Silver(II) / Silver(III) system have been studied in aq. 2M $AgNO_3$ solution with Platinum and Carbon electrodes. It has been found that $Ag_7O_8NO_3$ can be produced at relatively higher current density. Deposited black Oxy-salt were analyzed with several methods such as oxidizing power, X-ray powder diffraction patterns, thermal analysis, and reduction curves. It decomposed to AgO upon being suspended in boiling water. AgO compound obtained from $Ag_7O_8NO_3$ were purer and denser than Alfa-product AgO.

• Bulletin of the Korean Chemical Society
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• v.33 no.8
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• pp.2592-2596
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• 2012

Cysteine capped silver nanoparticles (Cys-AgNPs) have been synthesized by employing electrochemically active biofilm (EAB), $AgNO_3$ as precursor and sodium acetate as electron donor in aqueous solution at $30^{\circ}C$. Cys-AgNPs of 5-10 nm were synthesized and characterized by UV-Vis, FT-IR, XRD and TEM. Capping of the silver nanoparticles with cysteine provides stability to nanoparticles by a thiolate bond between the amino acid and the nanoparticle surface and hydrogen bonding among the Cys-AgNPs. In addition, the antibacterial effects of as-synthesized Cys-AgNPs have been tested against two pathogenic bacteria Escherichia coli (O157:H7) and Pseudomonas aeruginosa (PAO1). The results demonstrate that the as-synthesized Cys-AgNPs can proficiently inhibit the growth and multiplication of E. coli and P. aeruginosa.

• Journal of the Korean Society of Industry Convergence
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• v.2 no.2
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• pp.83-90
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• 1999

A cellulose acetate membrane containing silver nitrate was prepared by gelatinizing in water at $2^{\circ}C$ after evaporating solvent from the casting solution on a glass plate. Permeation experiments for oxygen and nitrogen were conducted in the ranges of temperature, $5-40^{\circ}C$ and pressure difference, $1-5kg/cm^2$ in order to investigate the effects of temperature and pressure difference on permeation characteristics of the membrane. When the evaporation time was increased, the permeability of oxygen decreased but the separation factor of oxygen against nitrogen increased since a more dense layer was formed on the membrane surface. When the silver nitrate was added, the permeation flux was doubled and the separation factor was improved from 3.0 to 3.3. This implies that silver nitrate acts as an oxygen carrier in the membrane.