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서춘희,강영종 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
In nature, structural plumage color show high purity color produced by basal melanin layer that absorb incoherently scattered white light from the feather. We can make artificial structural color of quasi-amorphous photonic solution (QAPS) using colloidal solution. But low color saturation and reflectance of QAPS have been the main drawbacks. So, we subjected enhancement of reflectance and broad color gamut using SiO<sub>2</sub> and polydopamine (PDA) nanoparticles binary system. QAPS structural color saturated by incorporating a small quantity of PDA nanoparticles due to broadband absorption spectrum of PDA in visible region. Consequently, SiO<sub>2</sub>/PDA binary QAPS system decreased incoherent scattering and has saturated structural color and broad color gamut. Also, unlike structural color reflectance drop due to light absorption of black material in other research, our system enhances reflectance by matching SiO<sub>2</sub> and PDA nanoparticles diameter.
서춘희,강영종 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
General photonic crystals are made up materials that have different real part of refractive index and until now, imaginary part of refractive index in photonic crystals is not considered. So, we investigated how absorbance affect to reflectance of photonic crystals and use polydopamine (PDA) nanoparticles as absorbing material. When PDA put into SiO<sub>2</sub> quasi-amorphous photonic solution (QAPS), PDA/SiO<sub>2</sub> QAPS shows high contrast photonic color and enhanced reflectance. Also, when dye trapped polystyrene (PS) nanoparticles are added in QAPS, novel phenomena occurred. Only when photonic bandgap region matched with absorbance band of dye, reflectance of QAPS enhanced. Otherwise reflectance intensity not changed. This result show interplay between absorption and reflectance and considerably encourage in field of optics using photonic crystals.
Fabrication of dielectrophoretic photonic microcapsules for sensing local electric field
서춘희,강영종 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Colloid nanoparticle systems have extensively employed for diversity of applications due to their intrinsic forces in self-assembly by various external stimuli. Especially, electric field responsive colloid systems are frequently used because of their various kinds of applications. Electrohydrodynamic effects on a concentric double emulsion drop have been studied theoretically for past decades. We designed such system of aqueous colloid solution in thin-layer double emulsion microcapsules made by the microfluidic chip which showed dielectrophoretic force in inner drop under non-uniform DC field. We would control the shell thickness of capsules for active tuning of self-assembly and observe photonic colors to confirm structure ordering formed by dielectrophoresis. These microcapsules showed electrically stable at high electric field which could be a good stepping stone for developing practical applications of photonic displays.