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Hierarchical Hybrid Nanostructures Constructed by Liquid Crystal Self-Assembly
Kwang-Un Jeong(정광운) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
By controlling the hierarchical nanostructures, we can develop advanced materials with the desired properties. For the construction of well-defined nanostructures of pristine [60]fullerene (C60) arrays, pyrene-based molecular tweezers (PT) were used as host molecules for arranging C60 guest molecules. The formation of host-guest complexes was studied in solution as well as in the solid state. Two-dimensional NMR studies revealed that host-guest complexes were related to the molecular self-assembly of PT. X-ray diffraction results exhibited the construction of well-defined layered nanostructures of the complexes. From electron mobility measurements, it was demonstrated that the well-defined nanostructure incorporating a C60 array exhibited a high electron mobility. This research demonstrated that chemical function transfer and shape amplification of programmed liquid crystal molecules allowed us to fabricate advanced materials with the desired properties on a macroscopic length scale.
Synthesis and Characterization of a Tetrathiafulvalene-Based Polymer
이세현,Lei Wang,황석호,이명훈,정광운,Kwang-Un Jeong 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
A novel tetrathiafulvalene (TTF)-based main-chain polymer (6TTF-polymer) was successfully synthesized via a condensation polymerization between a newly synthesized dihydroxy TTF derivative and a malonyl chloride, and its chemical structure was characterized by spectroscopic techniques. Molecular weight of the 6TTFpolymer (9,030 g/mol by gel permeation chromatography) was large enough to form the ductile film. The electrochemical and optical properties of the 6TTF-polymer were further estimated by cyclic voltammetry, ultraviolet and photoluminescence spectroscopes. The highest occupied molecular orbital level (EHOMO = −4.79 eV) and band-gap energy (Eg = 1.91 eV) of the 6TTF-polymer suggested that TTF-based polymer could act as a good electron donating material for the optoelectronic applications.
이기쁨 ( Gi Bbeum Lee ),박성은 ( Sung Eun Park ),김인우 ( In Woo Kim ),정광운 ( Kwang Un Jeong ),이홍기 ( Hong Ki Lee ),나창운 ( Chang Woon Nah ) 한국고무학회 2011 엘라스토머 및 콤포지트 Vol.46 No.2
종래의 방사선 차단막은 납판이나 납 분말을 과량 배합하여 사용되고 있기 때문에 무거울 뿐만 아니라 인체중독의 위험성이 있다. 또한 작은 핀홀이 존재할 경우 방사선의 직접 투과 위험성이 있는 단점이 있다. 본 특집에서는 최근 선진국을 중심으로 연구가 활발한 다층구조의 고분자 방사선 차단막 기술에 대해 특허분석과 문헌고찰을 중심으로 소개한다. 특히 판상형 나노무기입자를 이용한 방사선 차단 및 내구성 향상에 대한 새로운 개념을 소개한다. The conventional radiation barriers may show some disadvantages such as heavy weight and possibility of poisoning human bodies because they are composed of lead plates or resin plates containing large amounts of lead powders. Another disadvantage may be direct penetration of radiation through small pin holes. In this article, technologies of multi-layered polymer barriers against radiation, which has been extensively focused recently, will be introduced. A new concept of radiation protection as well as improving endurance with employing nano-layered inorganic particles is introduced.