• 한국염색가공학회지
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• 제20권1호
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• pp.22-27
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• 2008

Sulfadiazine and silver sulfadiazine are well-known bactericidal agent routinely used clinical settings. Antimicrobial acid dyes were synthesized by introducing sulfadiazine or silver sulfadiazine and applied on nylon fabric. The Chemical Structure of the Synthesized dyes was identified by HPLC-mass. The dyeability of synthesized acid dyes for nylon fabric was similar to commercial acid dyes. Resistance to washing, rubbing and lightfastness were good. Nylon fabrics dyed with synthesized acid dyes had good antimicrobial properties. Durable antimicrobial properties after 20 times washing have shown good result that reduction ratio of colonies, is 99.9 %. Mixed dyeing were carried out using commercial acid dyes(leveling type) and synthesized dyes. The mixed dyeings have also shown good antimicrobial properties.

• 방사선산업학회지
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• 제7권2_3호
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• pp.141-147
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• 2013

The simple and facile radiation technique of the preparation of antibacterial biodegradable polymer films containing silver nanoparticles (Ag NPs) was described. The biodegradable poly(butylene adipate-co-terephthalate) (PBAT) films containing silver trifluoroacetate (Ag TFA) were prepared by a solvent casting method, and then the films were irradiated by electron beams at the various doses ranging from 20 to 200 kGy to form Ag NPs in the biodegradable polymers. The results of UV-vis and FE-SEM/EDX analyses revealed that the Ag NPs were successfully formed in the PBAT matrix during the electron beam irradiation, and their amounts were dependant on the absorbed dose and Ag TFA concentrations. Furthermore, on the basis of the results of the antibacterial test through disk diffusion and colony counting test, the irradiated PBAT/Ag TFA films exhibited the antibacterial property due to the formation of Ag NPs.

• 대한치과교정학회지
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• 제53권1호
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• pp.16-25
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• 2023

Objective: We aimed to evaluate the cell viability and antimicrobial effects of orthodontic bands coated with silver or zinc oxide nanoparticles (nano-Ag and nano-ZnO, respectively). Methods: In this experimental study, 30 orthodontic bands were divided into three groups (n = 10 each): control (uncoated band), Ag (silver-coated band), and ZnO (zinc oxide-coated band). The electrostatic spray-assisted vapor deposition method was used to coat orthodontic bands with nano-Ag or nano-ZnO. The biofilm inhibition test was used to assess the antimicrobial effectiveness of nano-Ag and nano-ZnO against Streptococcus mutans, Lactobacillus acidophilus, and Candida albicans. Biocompatibility tests were conducted using the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide assay. The groups were compared using oneway analysis of variance with a post-hoc test. Results: The Ag group showed a significantly higher reduction in the number of L. acidophilus, C. albicans, and S. mutans colonies than the ZnO group (p = 0.015, 0.003, and 0.005, respectively). Compared with the control group, the Ag group showed a 2-log₁₀ reduction in all the microorganisms' replication ability, but only S. mutants showed a 2-log₁₀ reduction in replication ability in the ZnO group. The lowest mean cell viability was observed in the Ag group, but the difference between the groups was insignificant (p > 0.05). Conclusions: Coating orthodontic bands with nano-ZnO or nano-Ag induced antimicrobial effects against oral pathogens. Among the nanoparticles, nano-Ag showed the best antimicrobial activity and nano-ZnO showed the highest biocompatibility.

• 한국응용과학기술학회지
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• 제37권5호
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• pp.1100-1105
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• 2020

본 연구는 기계화학적 활성화 된 스카치테이프가 금속 이온 수용액에서 유발하는 자발적 금속 나노입자 필름 형성의 구동력과 그 크기를 전기화학적 방법으로 분석했다. 은 필름이 형성된 테이프를 질산에 녹이고, 완충용액과 섞어 전기화학 측정용 샘플을 준비했다. 양극 벗김 전압전류법의 피크 신호를 통해, 은 입자의 자발적 환원에 소모된 전하량을 측정했다. 이를 검정 곡선에 대입하여, 환원된 은의 양을 구했다. 그 결과 은의 양이 선행 연구 대비 10⁶배 많은 점, 수용액에서 전하를 가진 이온들의 짧은 수명을 참고하여, 자발적 반응의 구동력을 라디칼로 결론 냈다.

• 한국염색가공학회지
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• 제33권1호
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• pp.24-30
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• 2021

In this study, PET containing 3% silver ion-exchange zeolite was mixed with cotton in a ratio of 6:4 to prepare a spun yarn to evaluate the tensile strength, absorption speed, absorption rate, antibacterial property, and the efficiency of deodorization. As a result, the following conclusions were obtained. First, it can be confirmed that silver ion exchange zeolite is evenly distributed inside and on the surface of the antimicrobial PET-SF through SEM. It was found that the tensile strength between the CVC sample mixed with silver ion zeolite PET and cotton and the normal cotton 100% sample was slightly lower in the CVC sample. Although the absorption speed and water absorption rate were measured to find out the moisture characteristics, it was confirmed that there was no significant difference. The contact angle was slightly larger in the antimicrobial CVC sample, but the time it took for the moisture to completely penetrate into the knit fabric was 0.85 seconds. In addition, it was found that out of the total mixing ratio, 40% of antibacterial PET was spun with regular cotton to produce yarn, which had an excellent bacteria reduction rate of 99.9% and a deodorization efficiency of 85%.

• Bulletin of the Korean Chemical Society
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• 제10권3호
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• pp.230-234
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• 1989

The crystal structure of $Ag^+$-exchanged zeolite A vacuum-dehydrated at $370^{\circ}C$ and then treated with carbon monoxide at $$23^{\circ}C$ has been determined by single crystal x-ray diffraction methods in the cubic space group Pm3m at $23^(1){\circ}C$ ; a = 12.116 (2)${\AA}$. The structure was refined to the final error indices $R_1\;=\;0.061\;and\;R_2$(weighted) = 0.068 using 349 independent reflections for which I > 3${\sigma}(I).\;3.6\;Ag_+-CO$ complexes, where -CO may represent -CHO or -$CH_2OH$, were found in each large cavity. By coordination to silver atoms followed by reaction with $Ag^{\circ}and\;H^+$ within the zeolite, carbon monoxide has been partially reduced. In about 28% of the sodalite units, a $Ag_6(Ag^+)_2$ cluster may be present. In about 37% of the sodalite units, three $Ag^+$ ions are found on threefold axes where they may be bridged by three water molecules. The remaining 35% of the sodalite units are empty of silver species. Two $Ag^+$ ions per unit cell are associated with 8-ring oxygens. The remaining ca $$3Ag^+$ ions per unit cell have been reduced during the synthesis and have migrated to form small silver crystallities on the surface of the zeolite single crystal.

• 청정기술
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• 제21권2호
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• pp.85-89
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• 2015

다양한 전자부품에 활용되는 금속 잉크 기술은 전자부품산업의 주요 기술로 자리매김하였으며 이에 대한 연구 개발이 점차 증가하고 있다. 그 중에서 실버 잉크는 뛰어난 전도성과 안정성을 가지고 있어서 전자부품산업에 오랫동안 이용되어 왔으며 최근에는 입자 크기를 나노 크기로 분산시킨 실버 나노 잉크를 개발하여 디스플레이, 전자태그, 반도체와 연성회로 기판 등에 사용되는 전자소재로써 각광받고 있다. 그러나 이러한 전자산업기기의 첨단화는 제품의 생산량과 소비량을 증가시켜 제조 공정 중에 발생되는 환경오염 물질과 사용하고 버려지는 제품들에 의해 심각한 환경 문제를 가져올 것으로 예상된다. 따라서 본 연구에서는 습식환원법에 의해 제조된 실버나노 잉크의 제조 공정이 환경에 미치는 영향을 전과정평가(life cycle assessment, LCA) 기법을 이용하여 평가하였다. 전과정 평가 소프트웨어로는 GaBi 6를 사용하였고, 유관기관으로부터 받은 실버 나노 잉크의 제조 공정 데이터를 참고하여, 인벤토리를 구축하였으며 전과정목록분석(international organization for standardization, ISO) 14040, 14044 규격의 4단계에 걸쳐 LCA를 수행하였다.

• 대한화학회지
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• 제13권2호
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• pp.141-147
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• 1969

Organophosphorous compounds can be reduced by zinc metal in acidic solution after alkaline hydrolysis. Although phosphates and phosphonates did not evolve any gas, dithioates did evolve hydrogen sulfide and phosphine, thionates and thiolates did evolve only hydrogen sulfide. The evolved gases were qualitatively detected by means of lead acetate and silver nitrate or mercuric bromide papers and determined by spectrophotometrically. The reduction mechanism and analytical method of dithioates were proposed.

• Archives of Plastic Surgery
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• 제40권5호
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• pp.589-596
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• 2013

Background The treatment of pressure ulcers is complicated, given the various wound dressing products available. The cost of different treatments varies and the cost-effectiveness of each product has not been thoroughly evaluated. We compare two wound dressing protocols-alginate silver dressing (AlSD) and silver zinc sulfadiazine cream (AgZnSD) with regard to wound healing and cost-effectiveness Methods Patients with grade III or IV sacral or trochanteric pressure ulcers were eligible for this prospective, randomized controlled trial. The patients were randomized to receive one of the two dressings for an eight-week period. The criteria of efficacy were based on the Pressure Ulcer Scale for Healing (PUSH) scoring tool. The cost of treatment was also assessed. Results Twenty patients (12 women and 8 men) were randomly assigned to receive either AlSD (n=10) or AgZnSD cream (n=10). The demographic data and wound characteristics were comparable in the two groups. The two groups showed no significant difference in the reduction of PUSH score, wound size, or volume of exudate. The tissue type score was significantly lower in the AlSD group ($3.15{\pm}0.68-1.85{\pm}0.68$ vs. $2.73{\pm}0.79-2.2{\pm}0.41$; P=0.015). The cost of treatment was significantly lower in the AlSD group (377.17 vs. 467.74 USD, respectively; P<0.0001). Conclusions Alginate silver dressing could be effectively used in the treatment of grade III and IV pressure ulcers. It can improve wound tissue characteristics and is cost-effective.

• 한국전문물리치료학회지
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• 제2권2호
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• pp.66-72
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• 1995

The purpose of this study was to determine a more effective method for shoulder pain reduction. Forty-five normal subjects were randomly assigned to one of 3 groups a control group, an acupuncture-like transcutaneous electrical nerve stimulation(ALTENS) group, and a silver spike point(SSP) group. Each person in the ALTENS and SSP groups was measured for pressure pain threshold before and after a 20 minute treatment. The control group was also checked for pressure pain threshold before and after a 20 minute period but no "treatment" was given. The major findings were as follows ; 1)The ALTENS and SSP groups showed significant differences before and after treatment but the control group showed no significant difference. 2)When the three groups were compared, the only significant difference was between the SSP group and the control group. As mentioned above, it may be concluded that both ALTENS and SSP therapy were effective in reducing shoulder pain when measured directly after treatment. However, SSP did not show any superior effect. Further study should be done to determine the effective the maintained pain reduction with post-treatment time lapse.