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Conjugated Polymer-Assisted Visible Light Absorption of Titania Nanoparticles and Nanofibers
Taek Seung Lee(이택승) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Titanium dioxide is well-known as an efficient photocatalyst, but it has decisive shortcoming involved in deficient visible light absorbance, in which only about 10% of sunlight (UV) is available for photocatalysis. Conjugated polymers have emerged as promising candidates for visible-light-driven photocatalytic activity because of their high absorption in UV and visible region via structural tunability and functional diversity. We fabricated organic/inorganic nanocomposite using conjugated polymer dots (CPdots) and mesoporous titania (MT). The CPdots showed high absorption in visible regions; and the MT exhibited absorption in UV region. CPdots@MT had a visible-light-driven catalytic activity because visible-light excited electrons of CPs moved to MT. The transferred electrons in MT were involved in the generation of reactive oxygen species, in which can be used in the applications in dye degradation, organic synthesis, even in micromotioning under visible-light irradiation.
홍성일,이택승,이남관,Hong, Seong-Il,Lee, Taek-Seung,Lee, Nam-Gwan 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.7
Polypropylene was reacted with maleic anhydride to improve the dyeability. The modified polypropylene was characterized by T-lR, SEM, and elemental analysis. This maleic anhydride reacted polypropylene showed a good dyeability with basic dye and disperse dye. The crystallinity of modified polypropylene was decreased with increasing the maleic anhydride content reacted onto polypropylene. The inherent viscosity of modified polypropylene was decreased because the chain scission occurred during the reaction. Blends of Polypropylene and modified Polypropylene with energy quencher were dyed excellently with disperse dyes, while those without energy quencher were dyed excellently with basic dyes. Blends of Polypropylene and modified Polypropylene mixed with energy Quencher show a lower crystallinity than those mixed without energy quencher.
광이성질화 현상을 갖는 아조벤젠 리간드와 이를 사용한 금속-유기구조체 제조
윤여주,장근석,이택승,Yoon, Yeoju,Jang, Geunseok,Lee, Taek Seung 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.1
Metal-organic frameworks (MOFs) were prepared by a reaction of 4,4'-(diazene-1,2-diyl)dibenzoic acid (AzDC) as organic ligand and metal ions including zinc, iron (III), copper, and cobalt ions, respectively. Because the synthesized AzDC contained azobenzene and carboxylic acids groups at each ends, it showed trans-to-cis photoisomerization upon UV irradiation and interaction with metal ions, respectively. The AzDC showed more efficient photoisomerization upon exposure to UV light (365 nm), rather than UV light at 254 nm, mainly due to the larger absorption around 365 nm than 254 nm. The isomerization of cis-to-trans azobenzene was observed under ambient light. The resultant MOFs containing AzDC ligand showed photo-triggered conversion of trans- to cis-azobenzene after exposure to UV light. Thus, the porous structure and photo-induced dimensional deformation of the MOFs enable to use in chemical sensing, gas separation, gas storage, catalysis, and drug delivery.
형광 공액화 고분자전해질과 DNA 앱타머의 복합체를 사용한 단백질 센서
손지혜,김충호,이택승,Son, Jihye,Kim, Choongho,Lee, Taek Seung 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.6
A water-soluble anionic conjugated polyelectrolyte was successfully synthesized via the Suzuki cross-coupling reaction in the presence of a palladium catalyst. Using this fluorescent polyelectrolyte, a new concept for a rapid, label-free lysozyme-sensing method is proposed via possible naked-eye detection of the emission color change. Intermolecular exciton migration in the conjugated polyelectrolyte-based complex was adopted to enhance the selectivity and sensitivity for lysozyme sensing by the formation and dissociation of the polymer-lysozyme assay complex in the absence and presence of the anti-lysozyme aptamer, respectively. The polymer-lysozyme complex showed red emission because of cooperative aggregation of the conjugated polyelectrolyte and lysozyme. Upon exposure to the aptamer, the complex dissociated into individual molecules, resulting in a transparent blue-emitting solution. This occurred because lysozyme is released from the complex by the aptamer via the more favorable binding between the two molecules (lysozyme and aptamer).
이민기와 플루오렌기를 주쇄에 함유하는 고분자의 광기전 성질
김형준,이정효,곽찬규,진성호,이택승,Kim, Hyung-Jun,Lee, Jung-Hyo,Kwak, Chan-Kyu,Jin, Sung-Ho,Lee, Taek-Seung 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.1
New polyimine derivative containing fluorene group in the main chain was synthesized via Suzuki cross-coupling polymerization, reduction, and imine formation reaction, consecutively. The synthesized polymer was characterized and explored as organic photovoltaic cell device. The imine polymer P3 in diluted chloroform solution emitted red light (582 nm), whereas its precursor polymers P1 and P2 showed green (about 530 nm) and blue fluorescence (477 nm), respectively. Bulk heterojunction photovoltaic cells fabricated by blending P3 with the fullerene derivative PCBM was found to have a power conversion efficiency of upto 0.0005%, while cells from blending P3 with MEH-PPV yielded 0.0008% of power conversion efficiency.
페난트롤린 유도체를 함유하는 형광 고분자 입자의 구리(II) 이온 감지
장근석(Geunseok Jang),이택승(Taek Seung Lee) 한국고분자학회 2020 폴리머 Vol.44 No.2
형광 유기재료를 사용한 금속 이온 분석 방법은 많은 관심을 받고 있으며, 특히, 1,10-페난트롤린은 금속 이온과 결합을 통하여 감지에 뛰어난 성능을 보이는 것으로 알려져 있다. 이에 따라, 1,10-페난트롤린 유도체를 함유하는 고분자 입자를 제조하기 위하여 스타이렌과 1,10-페난트롤린 단량체를 공중합하여 형광 입자를 제조하였다. 이러한 형광 입자를 사용하여 수용액에서 구리(II) 이온 검출을 진행하였으며, 제조한 형광 고분자 입자는 구리(II) 이온에 대하여 형광이 변화되었다. 형광 변화를 이용한 구리(II) 이온 검출은 형광 턴-오프에 기반한 형광센서로 우수한 성능을 보였다. Organic fluorescent sensors have received great attention for metal ions detection. Especially, it has been known that 1,10-phenanthroline is able to form a complex with metal ions. In this work, 1,10-phenanthroline derivative was copolymerized with styrene to fabricate particles, enabling detection of Cu(II) ions in aqueous medium. The polymer particles showed a high responsiveness to Cu(II) ions via fluorescence change. Recognition of Cu(II) ions via fluorescence change of the polymer particles exhibited a good performance as a fluorescent sensor based on fluorescence turn-off system.
김태훈(Tae Hoon Kim),장근석(Geunseok Jang),이택승(Taek Seung Lee) 한국고분자학회 2017 폴리머 Vol.41 No.4
광기록 저장재료로서 벤족사졸을 사용하기 위하여 벤족사졸 유도체(PPHBO)를 2,5-dihexyloxybenzene-1,4-diboronic acid와 t-butoxycarbonyl(t-Boc)기로 치환된 벤족사졸을 사용하여 합성하였으며, 이의 광학적 성질을 측정하고, UV 조사에 의해 형광색이 변화하는 특성을 이용하여 형광 패터닝을 수행하였다. t-Boc기가 보호/탈보호된 벤족사졸 화합물의 용액에서와 고상에서 광학적 성질을 분자 conformation 관점에서 분석하였으며, 이를 기반으로 이 화합물의 분자내 양성자 이동 특성을 이용하여 형광 패터닝에 사용하였다. 벤족사졸 화합물을 PVA와 혼합하고, 실리콘 웨이퍼를 기판으로 하여 UV 조사에 의하여 형광이 변화하는 특성을 이용하여 UV 광기록 및 삭제를 실시하여 광기록 저장재료로서 활용성을 연구하였다. p-Phenylene dihydroxyphenylbenzoxazole (PPHBO) compound was synthesized with t-butoxycarbonyl (t-Boc)-protected benzoxazole moiety and 2,5-dihexyloxybenzene-1,4-diboronic acid, followed by cleavage of the t-Boc group, in which PPHBO would be used for optical recording because of its unique photophysical properties. The optical properties of PPHBO were investigated in solution and in the solid state in terms of molecular conformation. The intramolecular proton transfer in PPHBO was used for fluorescence patterning. The solid film (mixed with PVA) on silicon wafer showed fluorescence quenching under UV irradiation, which was used for photo-triggered recording and erasing.
김형준,이정효,곽찬규,손원근,박원호,이택승,Kim, Hyung-Jun,Lee, Jung-Hyo,Kwak, Chan-Kyu,Son, Won-Keun,Park, Won-Ho,Lee, Taek-Seung The Korean Fiber Society 2006 한국섬유공학회지 Vol.43 No.5
Four copolymers of 9,9-dihexylfluorene and benzothiadiazole derivatives with or without quinoxaline were newly synthesized via Suzuki coupling reaction and characterized. The conjugated polymers with benzothiadiazole moiety in the main chain emitted green fluorescence, while their reduced polymers showed blue emission due to perturbation in the donor-acceptor structure. The polymers were spin-cast into thin films in the presence or absence of photoacid generator and well-defined fluorescence patterns were fabricated on the films by simple UV irradiation. The polymer was electrospun with poly(methyl methacrylate) to produce flexible fibrous mats. Fluorescence patterning was also conducted onto the electrospun fiber web to obtain a stable and flexible pattern without bending damage.