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3차원 광밴드갭 결정 : 제조와 응용 Fabrication and Applications
양승만,이기라 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
미시적 공간에서 광자르 자유롭게 제어할 수 있는 소재인 광결정은 광통신과 광컴퓨터에 쓰이는 채널드롭 필터(channel drop filter), 광파가이드(optical waveguide), 나노레이저(nanolaser)와 같은 핵심소자의 기본 재료일 뿐만 아니라 차세대 마이크로디스플레이의 칼라화소로 활용될 수 있다. 본 글에서는 3차원 광결정의 기본 개념과 지금까지 제안된 제조공정을 소개하고 응용분야에 대해 살펴본다. 광결정 제조 공정 중 화학공학자들의 관심을 끌 수 있는 콜로이드 자기조합체(self-assembly)의 3차원 광결정으로의 응용에 대해 중점적으로 소개하고자 한다. Photonic crystals are referred to as semiconductors for light and can control the flow of photons in microscopic space since semiconductors do the flow of electrons in ULSI(Ulta Large Scale Integration) circuits. Therefore, photonic crystals have attracted enormous attention due to their potential applications including channel-drop filters, nanolasers, optical waveguides and others that are required for the development of next-generation optical telecommucation devices and optical computers. Photonic crystal balls at micrometer scales can be also used as full-color pixel sources in fabrication of three-dimensional photonic crystals have attracted enormous attention due to their potential applications including channel-drop filters, nanolasers, optical waveguides and others that are required for the development of next-generation optical telecommunication devices and optical computers. Photonic crystal balls at micrometer scales can be also used as full-color pixel sources in the pioneering microdissional photonic crystals, and their potential application areas. In particular, we emphasize the colloidal self-assembly scheme that is the most attractive to chemical engineers among several synthetic methods.
Tunable Photonic Microspheres of Comb-Like Supramolecules
Yi Yang,Tae-Hui Kang,Gi-Ra Yi,Jintao Zhu 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Photonic crystals (PCs) are ideal candidates for reflective color pigments with high color purity and brightness due to tunable optical stop band. Herein, the generation of PC microspheres through 3D confined supramolecular assembly of block copolymers (polystyrene-block-poly(2-vinylpyridine), PS-b-P2VP) and small molecules (3-n-pentadecylphenol, PDP) in emulsion droplets is demonstrated. The intrinsic structural colors of the PC microspheres are effectively regulated by tuning hydrogen-bonding interaction between P2VP blocks and PDP, where reflected color can be readily tuned across the whole visible spectrum range. Also, the effects of both PDP and homopolymer (hPS) on periodic structure and optical properties of the microspheres are investigated. Moreover, the spectral results of finite element method (FEM) simulation agree well with the variation of structural colors by tuning the periodicity in PC microspheres. The supramolecular microspheres with tunable intrinsic structural color can be potentially useful in the various practical applications including display, anti-counterfeit printing and painting.
한현우,윤정훈,Gi-Ra Yi,최원일,임종민 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Continuous synthesis of polymeric nanoparticles (NPs) has been intensively studied due to its greatpotential to produce NPs with the physicochemical properties of reproducibility and controllability. Here,we developed a self-aligned coaxial turbulent jet mixer for high-speed continuous synthesis of polymericNPs. The coaxial turbulent jet mixer can be constructed using commercial tubefittings and tubes. Sincethosefluidic components are self-aligned coaxially, leak-free jet mixers can be assembled without theuse of tools or specialized skills in robust manner. Using the jet mixer with polystyrene (PS) solution,uniform polymeric NPs can be synthesized in a fully continuous manner, for which diaphragm pumpsand pulsation dampers are used for continuous control of theflow. We also improved the dispersionstability of the PS NPs in aqueous solution against centrifugation by introducing polystyrene-poly(ethylene oxide) diblock copolymer (PS-b-PEO) as steric stabilizer. The NPs prepared using the coaxialturbulent jet mixer were smaller and more uniform in size compared to NPs synthesized by a bulknanoprecipitation method.