통합 검색 | Korea Science

Shin, Su-Mi;Sung, A-Young
- 한국재료학회지
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- 제29권12호
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- pp.735-740
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- 2019
The purpose of this study is to fabricate an ophthalmic lens by copolymerizing two types of carbon nanotubes and hydrophilic hydrogel lens materials, and to investigate its application as an ophthalmic lens material by analyzing its physical properties and antimicrobial effect. For polymerization, HEMA (2-hydroxyethyl methacrylate), EGDMA (ethylene glycol dimethacrylate), a crosslinking agent, and AIBN (azobisisobutyronitrile), an initiator, are used as a basic combination, and a single-walled carbon nanotube and a single-walled, carboxylic-acid-functionalized carbon nanotube are used as additives. To analyze the physical properties, the water content, refractive index, breaking strength, and antimicrobial effect of the fabricated lenses are measured. The fabricated lenses satisfies all the basic properties of the basic hydrogel ophthalmic lens. The water content increases with increasing amount of additive and decreases with addition of 0.2 % ratio of nanoparticles. The refractive index is inversely proportional to the water content result. As a result of the antimicrobial test of the fabricated lens, the addition of carbon nanotubes shows an excellent antimicrobial effect. Therefore, it is considered that the fabricated lens can be applied as a functional material for basic ophthalmic hydrogel lenses.
https://doi.org/10.3740/MRSK.2019.29.12.735 인용 PDF KSCI

황정의;곽영우;정재원;길천호
- 대한화학회지
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- 제35권2호
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- pp.105-110
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- 1991
수용액 중에서 발린과 노발린의 두 가지 해리상수를 온도와 압력을 변화시키면서 전도도법으로 측정했다. 이들 해리상수로부터 열역학적 성질들을 계산하여 해리반응의 특성을 알아보았다. 아미노산의 종류 즉, 아미노기의 위치나 사슬의 길이, 치환기의 종류에 따라 해리도가 어떤 영향을 받는가 하는 것을 Hammett식을 이용하여 검토했고 이것을 CNDO/2법으로 계산한 분자내 원자의 알짜 전하와 비교 검토하였다.
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