• Title/Summary/Keyword: nano silver

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Characterization and hydrothermal surface modification of non-swelling property mica using nano silver (은나노를 이용한 비팽윤성 운모의 수열적인 표면개질 및 특성평가)

  • Seok, Jeong-Won;Park, Ra-Young;Kim, Pan-Chae
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.17 no.4
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    • pp.172-178
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    • 2007
  • Mica (muscovite) powders were synthesized by hydrothermal method (horizontal turning method). The hydrothermal conditions for the synthesis of mica were prepared by the ratio of $K_2O : Al(OH)_3 : SiO_2$ = 1 : 3 : 3 mol% as the starting materials with KOH (8 mol%) solution as the hydrothermal solvent and reaction temperature at $260^{\circ}C$ for 72hrs. The synthetic powder used for preparation of nano silver coated mica by vertical hydrothermal treatment. The hydrothermal conditions for the treated as nano silver coating were prepared by the synthetic powder as raw materials, triple distilled water ($0.5{\ell}$) solution as the hydrothermal solvent with nano silver sol (1,000 ppm) as the material of nano silver coating and reaction temperature at $160{\sim}260^{\circ}C$ for 72 hrs. After hydrothermal treatment, structural, judgment of nano silver coating and character of nano silver coated mica were examined by XRD, SEM, TEM-EDX and shake plask method.

Natural Dyeing Absorption Properties of Chitosan and Nano Silver Composite Non-Woven Fabrics -Focus on Chrysanthemum Indicum Linn- (키토산/나노실버 복합섬유 혼방 부직포의 천연염색 염착특성 -감국을 중심으로-)

  • Hong, Byung-Suk;Chu, Young-Ju;Lee, Eun-Jin
    • Journal of the Korean Society of Clothing and Textiles
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    • v.34 no.5
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    • pp.775-783
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    • 2010
  • This study examines the dyeability, light fastness, washing fastness, and the antibacterial activity of chitosan and nano silver composite non-woven fabrics dyed with an extracted solution from Chrysanthemum Indicum Linn. The results show that an increase in the chitosan and nano silver percentage resulted in an increase in the $a^*$ values and $b^*$ values; however, the $L^*$ values decreased in the undyed condition. ${\Delta}E$ values of chitosan and nano silver composite non-woven fabrics were higher than cotton 100% non-woven fabrics in the dyed condition with an extracted solution from Chrysanthemum Indicum Linn, and mordant treatments influenced the chrominance change. In the dyed condition with an extracted solution from Chrysanthemum Indicum Linn, an increase in the percentage of chitosan and nano silver resulted in an increase of the K/S values. The dyeability of chitosan and nano silver composite non-woven fabrics increased by mordant treatments. The light fastness and washing fastness of the mordanted non-woven fabrics were better than the non-mordanted. For the antibacterial activity, the bacterial reduction rate of chitosan and nano silver composite non-woven fabrics was 99.9% to Staphylococcus aureus and Klebsiella pneumoniae.

Fabrication of silver stabilizer layer by coating process using nano silver paste on coated conductor (나노실버페이스트를 사용하는 코팅공정에 의한 coated conductor의 은 안정화층 제조)

  • Lee, Jong-Beom;Kim, Byeong-Joo;Kim, Hye-Jin;Yoo, Yong-Su;Lee, Hee-Gyoun;Hong, Gye-Won
    • Progress in Superconductivity and Cryogenics
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    • v.11 no.1
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    • pp.1-4
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    • 2009
  • Mechanical and electrical properties of silver stabilizer layer of coated conductor, which as prepared with nano silver paste as starting materials, have been investigated, Nano silver paste was coated on a YBCO film by dip coating process at a diping speed of 20m/min. Coated film was dried in air and heat treated at $400{\sim}700^{\circ}C$ in an oxygen atmosphere. Adhesion strength between YBCO and silver layer was measured by a tape est(ASTM D 3359). Hardness and electrical conductivity of the samples were measured by pencil hardness test (ASTM D 3363) and volume resistance test by LORESTA-GP (MITSHUBISHD, respectively. The sample heat-treated at $500^{\circ}C$ showed poor adhesion 1B, but samples heat treated at higher than $600^{\circ}C$ showed enhanced adhesion of 5B. The silver layer heat-treated at $700^{\circ}C$ showed the high hardness value larger than 9 H, low volume resistance, surface resistance value as well as superior current carrying capacity compared to sputtered silver. SEM observations showed that a dense silver layer was formed with a thickness of about $2{\mu}m$. Dip coated silver layer prepared by using nano silver paste showed superior electrical and mechanical characteristics.

Characteristics of Silver Electrode Formed from Nano-Sized Silver and Glass Powders (나노 크기의 실버 및 글래스 분말로부터 형성된 실버 전극의 특성)

  • Koo, Hye Young;Kim, Jung Hyun;Yi, Jang Heui;Ko, You Na;Kang, Yun Chan
    • Korean Journal of Metals and Materials
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    • v.48 no.6
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    • pp.570-574
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    • 2010
  • Silver conducting films were formed from nano-sized silver powders and glass frits prepared by flame spray pyrolysis. The mean sizes of the silver powders and glass frits were 73 and 63 nm, respectively. Nano-sized glass frits improved the adhesion strength of the silver conducting film to the glass substrate. The densities of the silver conducting films increased by increasing the glass contents of the films at firing temperatures of 400 and $500{^{\circ}C}$. The specific resistances of the silver conducting films with 5 wt.% glass of silver component were 7.8, 4.2 and 2.4 cm at firing temperatures of 400, 450 and $500{^{\circ}C}$.

Nanotribological characteristics of silicon surfaces modified by IBAD (IBAD로 표면개질된 실리콘표면의 나노 트라이볼로지적 특성)

  • 윤의성;박지현;양승호;공호성;장경영
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2001.06a
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    • pp.127-134
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    • 2001
  • Nano adhesion and friction between a Sj$_3$N$_4$ AFM tip and thin silver films were experimentally studied. Tests were performed to measure the nano adhesion and friction in both AFM(atomic force microscope) and LFM(lateral force microscope) modes in various ranges of normal load. Thin silver films deposited by IBAD (ion beam assisted deposition) on Si-wafer (100) and Si-wafer of different surface roughness were used. Results showed that nano adhesion and friction decreased as the surface roughness increased. When the Si surfaces were coated by pure silver, the adhesion and friction decreased. But the adhesion and friction were not affected by the thickness of IBAD silver coating. As the normal force increased, the adhesion forces of bare Si-wafer and IBAD silver coating film remained constant, but the friction forces increased linearly. Test results suggested that the friction was mainly governed by the adhesion as long as the normal load was low.

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Synthesis of Silver Nano-particles by the Solution Plasma Sputtering Method (유체 플라즈마 방식을 사용한 은 나노파티클의 합성)

  • Yoo, Seung-cheol;Shin, Hong-Jik;Choi, Won Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.3
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    • pp.216-218
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    • 2016
  • In this study, we used not chemical and physical synthesis method but the solution plasma sputtering method in the synthesis of silver nano-particles. Synthesis of all the silver nano-particles was conducted for 1hour in 360 ml of distilled water and characteristics of changing the input voltage and frequency of the synthesised silver nano-particles by using the solution plasma sputtering method were analyzed through FE-SEM(Field Emission-Scanning Electron Microscope). We changed the input voltage from 8 kV to 10 kV in steps of 1 kV, input frequency from 20 kHz to 30 kHz in steps of 5 kHz in the solution plasma reactor with the advanced device which can control the DC voltage and frequency. We confirmed that the size of silver nano-particles were larger according to the change of the input voltage and frequency.

Effects of Silver Nanoparticles Exposed in Somite Stage on Zebrafish Development (Somite stage에 노출된 은나노 입자가 zebrafish 발생에 미치는 영향)

  • Hong, Suk-Ho;Song, Hyung-Gwi;Jeong, Kyeong-Jun;Ko, Kwang-Il;Yeo, Min-Kyeong
    • Environmental Analysis Health and Toxicology
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    • v.24 no.1
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    • pp.17-23
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    • 2009
  • Nanotechnology, one of the technologies that forms the core of the recent scientific innovation, is used much in our real lives. Especially products that use nano silver are being sold, with its positive characteristics resulting from the antibacterial effects of both nano materials and silver. But critiques have pointed out that nano silver diffused into everyday life too quickly as we do not have done any comprehensive research about the material, and worry that nano silver will affect the ecology adversely. Therefore, this research focuses on investigating the toxicity of silver nanoparticles first. To compare the effects of exposure to silver nanoparticles at pre-somite stage and somite stage(10 hours after fertilization), we exposed zebrafish embryos to silver nanoparticles(15, 30 ppt) during embryogenesis, and then checked the details of catalase enzyme activity. The hatch rate decreased in the silver nanoparticles exposed groups(15 and 30 ppt); furthermore, the hatched fishes had an abnormal notochord, damaged eyes and curved tail. The catalase activities of the 15 ppt exposed group at somite stage increased relative to those in the control group. Therefore, the silver nanoparticles could seriously damage the development of zebrafish embryos. Especially, exposure to silver nanoparticles at somite stage did severer damage than exposure since pre-somite stage did.

The Effect of Silver Nano-Particles on Surface Plasmon-enhanced OLEDs

  • Yeo, Ye-Won;Yang, Ki-Youl;Choi, Kyung-Cheol
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1220-1223
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    • 2009
  • The effect of silver (Ag) nano-particles on OLEDs was investigated by using a finite difference time domain (FDTD) tool. The proposed OLEDs employed Ag nanoparticles thermally deposited in a high vacuum on a cathode. The emission rate of the exciton was improved by 1.8 fold compared to the conventional OLEDs without Ag nano-particles. Less spacing between the dipole source and the Ag nano-particles resulted in a larger emission rate of the exciton in the OLED with nano-particles. The size of the Ag nano-particles was proportional to the emission rate of the exciton in a range of nano-meter scale of nano-particles. The enhancement of the emission rate of the exciton due to Ag nano-particles caused the improvement in the efficiency of the proposed OLED.

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Effect of Raising Process of Warp-knitted Fabric Containing Silver Nano-particles (기모공정에 따른 나노은입자함유 경편성물의 제품 특성에 관한 연구)

  • Son, Eun-Jong;Jung, Sung-Hoon;Hwang, Young-Gu;Jung, Hyun-Mi
    • Textile Coloration and Finishing
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    • v.22 no.4
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    • pp.356-361
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    • 2010
  • This study was aimed to investigate the antibacterial efficiency of silver nano-particles and the dyeing properties of a brushed warp-knitted fabric. The properties of the brushed warp-knitted fabric containing silver nano-particle by field production processes were evaluated by analyzing its silver contents, antibacterial activity, color difference, exhaustion curve, fastness and tearing strength. Bacterial reduction ratio amounts to 91.4 and 99.9 for Staphylococcus aureus and Klebsiella pneumoniae respectively. As the brushed pile length of its fabrics is longer, the exhaution rate of disperse dye becomes higher. The brushing process of its fabrics reduces the tearing strength. The results indicate that the brushed warp knitted fabric containing silver nano-particle can be a practically promising product.

Commercialization & Process Optimization of Protective Film on Nano Silver Transparent Conductive Substrate by Means of Large Scale Roll-to-Roll Coating and Experimental Design (나노실버 투명전도소재 보호필름의 개발 및 공정 최적화와 실험 계획법을 이용한 검증)

  • Park, Kwang-Min;Lee, Ji-Hoon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.12
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    • pp.813-820
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    • 2015
  • We have studied commercialization and process optimization of protective film on transparent conductive coated substrate, nano silver on flexible PET (poly ethylene terephthalate), by means of roll-to-roll micro-gravure coater. Nanosilver on flexible PET substrate is potential materials to replace ITO (indium tin oxide). Protective film is most important to maintain unique silver pattern on top of transparent PET. PSA pressure sensitive adhesives) was developed solely for nano silver on PET and protective film was successfully laminated. We have optimized all process conditions such as coating thickness, line speed and aging time & temperature via experimental design. Transparent conductive film and its protective film developed in this research are commercially available at this moment.