초음파화학법으로 합성한 광촉매 산화아연 나노입자와 PCM 마이크로캡슐을 복합한 잠수복용 고무 시트의 보온성 및 항균성

Abstract

Photocatalytic ZnO nanoparticles were synthesized through sonochemical synthesisprocess for depositing them onto PCM microcapsules for the purpose to providewarming ability and antibacterial activity to rubber sheets for diving suit. Spherical ZnOnanoparticles having average diameter of 50 nm could be synthesized in deionized waterunder ultrasonic irradiation for 30 min at pH 11.5. However, needle-like ZnO nanoparticleswere obtained in ammonium hydroxide instead of deionized water as medium. It wasfound that spherical shape is more favorable for the sonochemical coating thereof ontoPCM microcapsules. The formation of ZnO nanopartcles through Zn(OH)2 microparticleswere confirmed using UV-Vis spectroscopy and X-ray diffractometry. Composite rubbersheets containing 0-25 wt% of PCM microcapsules with or without ZnO nanoparicles wereprepared by solution casting. The composite rubber sheets exhibited much better warmingability compared than neat rubber sheet in cold water due to exothermic heat by PCMmicrocapsules. Moreover, The composite rubber sheets with ZnO nanoparicles showedexcellent antibacterial activity against bacteria of S. aureus by showing 99.9 % reduction ofbacteria.