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Ghardi EM, Scrimshire A, Smith R, Bingham PA, Middleburgh SC, Lee WE, Rushton MJD. First-principles study of lithium aluminosilicate glass scintillators. Phys Chem Chem Phys 2024; 26:6138-6147. [PMID: 38299662 DOI: 10.1039/d3cp05576k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
Radiation sensors are an important enabling technology in several fields, such as medicine, scientific research, energy, defence, meteorology, and homeland security. Glass-based scintillators have been in use for more than 50 years and offer many benefits, including their ability to respond to different types of radiation, and to be readily formed into various shapes. There is, however, the prospect to develop new and improved glass scintillators, with low self-absorption, low refractive indices, and high radiative recombination rates. To investigate the factors limiting the improvement of glass scintillator properties, this work provides insight from atomic scale simulations of the cerium-doped lithium aluminosilicate (SiO2-Al2O3-MgO-Li2O-Ce2O3) glass scintillator system. Three glass compositions were studied using molecular dynamics and density functional theory to investigate the effect of the ratio (with RAl/M = [0.1, 0.8 and 1.2]) on the structural and electronic properties. For a ratio RAl/M > 1, it has been shown that glasses with increased polymerization allow for more effective incorporation of Ce3+ cations. The structural analysis also showed that the bond order of Al-O can be affected in the presence of a lithium-rich environment. Electronic density of states and Bader charge analysis indicate a decline in the population of localized trapping states with increasing RAl/M. This suggests a higher probability of radiative recombination which can increase the photon yield of these scintillators. These findings provide valuable guidance for optimizing Li-glasses in neutron detection systems by highlighting the intricate challenges.
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Affiliation(s)
- E M Ghardi
- Nuclear Futures Institute, Bangor University, Gwynedd, LL57 2DG, UK.
| | - A Scrimshire
- Materials and Engineering Research Institute, College of Business, Technology and Engineering, Sheffield Hallam University, Sheffield, S1 1WB, UK
| | - R Smith
- Materials and Engineering Research Institute, College of Business, Technology and Engineering, Sheffield Hallam University, Sheffield, S1 1WB, UK
| | - P A Bingham
- Materials and Engineering Research Institute, College of Business, Technology and Engineering, Sheffield Hallam University, Sheffield, S1 1WB, UK
| | - S C Middleburgh
- Nuclear Futures Institute, Bangor University, Gwynedd, LL57 2DG, UK.
| | - W E Lee
- Nuclear Futures Institute, Bangor University, Gwynedd, LL57 2DG, UK.
| | - M J D Rushton
- Nuclear Futures Institute, Bangor University, Gwynedd, LL57 2DG, UK.
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Jin YJ, Si BM, Kim E, Lee J, Kim H, Kwak G, Sakaguchi T, Lee J, Song IY, Lee CL, Kim JH, Heo K, Lee WE. Reusable, Ultrasensitive, Patterned Conjugated Polyelectrolyte-Surfactant Complex Film with a Wide Detection Range for Copper Ion Detection. ACS Appl Mater Interfaces 2023; 15:12339-12349. [PMID: 36847579 DOI: 10.1021/acsami.2c21388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Conjugated polyelectrolytes (CPEs) are emerging as promising materials in the sensor field because they enable high-sensitivity detection of various substances in aqueous media. However, most CPE-based sensors have serious problems in real-world application because the sensor system is operated only when the CPE is dissolved in aqueous media. Here, the fabrication and performance of a water-swellable (WS) CPE-based sensor driven in the solid state are demonstrated. The WS CPE films are prepared by immersing a water-soluble CPE film in cationic surfactants of different alkyl chain lengths in a chloroform solution. The prepared film exhibits rapid, limited water swellability despite the absence of chemical crosslinking. The water swellability of the film enables the highly sensitive and selective detection of Cu2+ in water. The fluorescence quenching constant and the detection limit of the film are 7.24 × 106 L mol-1 and 4.38 nM (0.278 ppb), respectively. Moreover, the film is reusable via a facile treatment. Furthermore, various fluorescent patterns introduced by different surfactants are successfully fabricated by a simple stamping method. By integrating the patterns, Cu2+ detection in a wide concentration range (nM-mM) can be achieved.
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Affiliation(s)
- Young-Jae Jin
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, South Korea
| | - Beom-Min Si
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, South Korea
| | - Eonji Kim
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, South Korea
| | - Jineun Lee
- Department of Polymer Science & Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 41566, South Korea
| | - Heesang Kim
- Department of Polymer Science & Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 41566, South Korea
| | - Giseop Kwak
- Department of Polymer Science & Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 41566, South Korea
| | - Toshikazu Sakaguchi
- Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo 3-9-1, Fukui 910-8507, Japan
| | - Jinhee Lee
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, South Korea
| | - In Young Song
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, South Korea
| | - Chang-Lyoul Lee
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 61005, South Korea
| | - Joon Heon Kim
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 61005, South Korea
| | - Kyuyoung Heo
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, South Korea
| | - Wang-Eun Lee
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, South Korea
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Kim JW, Kim SJ, Song IY, Lee WE, Heo K, Kim SY, Lee J, Kim BK. Simple and rapid electrochemical monitoring for depolymerization of polyamic acid. Anal Chim Acta 2022; 1233:340489. [DOI: 10.1016/j.aca.2022.340489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 09/02/2022] [Accepted: 10/04/2022] [Indexed: 11/01/2022]
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Jin YJ, Park H, Moon BC, Kim JH, Lee WE, Lee CL, Kwak G. Unusual piezochromic fluorescence of a distyrylpyrazine derivative crystals: phase transition through [2 + 2] photocycloaddition under UV irradiation. Sci Rep 2021; 11:2762. [PMID: 33531511 PMCID: PMC7854636 DOI: 10.1038/s41598-021-81562-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 01/05/2021] [Indexed: 11/09/2022] Open
Abstract
The piezochromic fluorescence (FL) of a distyrylpyrazine derivative, 2,3-diisocyano-5,6-distyrylpyrazine (DSP), was investigated in this study. Depending on the recrystallization method, DSP afforded two different crystals with green and orange FL emission. The orange color FL emission crystal (O-form) was easily converted to the green color FL emission one (G-form) by manual grinding. The G-form was also converted to a slightly different orange color FL emission crystal (RO-form) by a weak UV irradiation. When the RO-form was ground again, the G-form was regenerated. The FL colors changed between the G- and RO-forms over several ten times by repeated mechanical grinding and UV irradiation. The FL, UV-visible, 1H-NMR and XRD results showed that the O (or RO)-to-G transformation induced by mechanical stress results from the change of degree of molecular stacking from dense molecular stacking structure to relatively loose molecular stacking structure, whereas the G-to-RO reconversion by UV irradiation results from return to dense molecular stacking structure again due to lattice movement (lattice slipping) allowed by photocycloaddition in solid-state.
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Affiliation(s)
- Young-Jae Jin
- Department of Polymer Science and Engineering, School of Applied Chemical Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu, 702-701, Korea
| | - Hyosang Park
- Department of Polymer Science and Engineering, School of Applied Chemical Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu, 702-701, Korea
| | - Byung-Chun Moon
- Department of Polymer Science and Engineering, School of Applied Chemical Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu, 702-701, Korea
| | - Jae Hong Kim
- School of Chemical Engineering and Technology, Yeungnam University, 214-1 Dae-dong, Gyeongsan, 712-749, Gyeongbuk, Korea.
| | - Wang-Eun Lee
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon, 305-600, Korea
| | - Chang-Lyoul Lee
- Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju, Korea.
| | - Giseop Kwak
- Department of Polymer Science and Engineering, School of Applied Chemical Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu, 702-701, Korea.
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Dahlfors M, Joannou J, Brummitt A, Rushton MJD, Middleburgh SC, Lee WE. THE UK NATIONAL THERMAL-HYDRAULICS FACILITY: MOTIVATIONS, DESIGN AND PLANNING STATUS. EPJ Web Conf 2021. [DOI: 10.1051/epjconf/202124720006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A UK National Thermal-Hydraulics Facility (NTHF) dedicated to supporting new reactor and other relevant business is being developed, one of the purposes being to deliver on the government’s carbon emission reduction commitments. The facility site is foreseen to be at Menai Science Park on the isle of Anglesey in North Wales, a region expected to see significant low carbon energy deployment in coming years. The UK NTHF is envisioned to cater for the needs of emerging nuclear in the UK – but also to serve as a hardware platform for international thermal-hydraulics research collaboration. Plans are to construct a platform capable of maintaining several test loops including support for the UK’s on-going, conventional nuclear new build programme as well as Gen-IV systems and associated materials like molten salt and liquid metal coolant media. Motivations are given for NTHF expected capabilities and requirements, which form the basis for its current design and planning state.
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Son JH, Lee WE, Byun DJ, Heo K. Surface defect formation in polyimide film via ion migration from glass substrate. Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Park SH, Kim J, Lee WE, Byun DJ, Kim MH. One-Step Synthesis of Hollow Dimpled Polystyrene Microparticles by Dispersion Polymerization. Langmuir 2017; 33:2275-2282. [PMID: 28191962 DOI: 10.1021/acs.langmuir.6b04428] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The design and preparation of hollow nonspherical microparticles are of great significance for their potential applications, but the development of a facile synthetic method using only one production step remains a great challenge. In the current work, a new template-free method based on dispersion polymerization was successfully developed to produce anisotropic hollow polystyrene (PS) microparticles in a single step. In the synthesis, ammonium persulfate (APS) played a critical role in the formation and growth of highly uniform and stable hollow PS microparticles. By varying the concentration of APS and that of the stabilizer used, polyvinylpyrrolidone, we were able to control the average size of the PS particles and their degree of concavity. Based on our results and observations, a plausible mechanism for formation of these unusually shaped PS microparticles was proposed.
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Affiliation(s)
- Sung Hwan Park
- Department of Polymer Engineering, Pukyong National University , 365 Sinseon-ro, Nam-gu, Busan 64547, Republic of Korea
| | - Jinwoo Kim
- Department of Polymer Engineering, Pukyong National University , 365 Sinseon-ro, Nam-gu, Busan 64547, Republic of Korea
| | - Wang-Eun Lee
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Gajeong-ro, Yuseong-gu, Daejeon 305-600, Republic of Korea
| | - Doo-Jin Byun
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Gajeong-ro, Yuseong-gu, Daejeon 305-600, Republic of Korea
| | - Mun Ho Kim
- Department of Polymer Engineering, Pukyong National University , 365 Sinseon-ro, Nam-gu, Busan 64547, Republic of Korea
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Abstract
Conjugated-polymer nanofibers with a thermodynamically stable, coarsened, disordered structure in an amorphous glassy state were fabricated via a freeze-drying method using a poly(diphenylacetylene) derivative. The nanofibers were extremely emissive, with a fluorescence (FL) quantum yield of approximately 0.34, which was much higher than that of both the cast film (0.02) and the solution (0.21). Similarly, the amplitude-weighted average FL lifetime of the nanofibers was 0.74 ns, which was much longer than that of the film (0.29 ns) and the solution (0.57 ns). This unusual and enhanced FL-emission behavior was attributed to the abruptly quenched chain structure that was created by the freeze-drying process. The polymer chains in the nanofibers remained frozen-in and the side phenyl rings were retained in a relaxed state. The metastable chains did not undergo vibrational relaxation and collisional quenching to generate the radiative emission decay effectively.
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Affiliation(s)
- Young-Jae Jin
- School of Applied Chemical Engineering, Major in Polymer Science and Engineering, Kyungpook National University 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea.
| | - Wang-Eun Lee
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 305-600, Korea
| | - Chang-Lyoul Lee
- Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju, Korea.
| | - Giseop Kwak
- School of Applied Chemical Engineering, Major in Polymer Science and Engineering, Kyungpook National University 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea.
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Kim BSI, Jin YJ, Sakaguchi T, Lee WE, Kwak G. Fluorescence Response of Conjugated Polyelectrolyte in an Immiscible Two-Phase System via Nonelectrostatic Interaction with Surfactants. ACS Appl Mater Interfaces 2015; 7:13701-13706. [PMID: 26031657 DOI: 10.1021/acsami.5b03717] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper reports a unique fluorescence (FL) response and diverse applications of conjugated polyelectrolyte (CPE) through nonelectrostatic interaction with appropriate (bio)surfactants in an immiscible two-phase system. A sulfonated microporous conjugated polymer (SMCP) with a conformation-variable intramolecular stacked structure was used as the CPE film. Despite the extremely high hydrophilicity, the SMCP film responded significantly to the hydrophobic circumstances, either physicochemically or electronically, in the presence of water-in-oil (w/o)-type nonionic surfactants with appropriate hydrophile-lipophile balance (HLB) values. The polymer film became fully wet with hydrophobic solvents due to the addition of small amounts of (bio)surfactant to reveal remarkable FL emission enhancement and chromism. Microcontact and inkjet printing using the SMCP film (or SMCP-adsorbed paper) and the surfactant solution as substrate and ink, respectively, provided high-resolution FL images due to the distinctive surfactant-induced FL change (SIFC) characteristic. Moreover, the additional electrostatic interaction of SMCP film with oppositely charged surfactants further enhanced the FL emission. Our findings will help comprehensive understanding of the nonelectrostatic SIFC mechanism of CPEs and development of novel SIFC-active materials.
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Affiliation(s)
- Beomsu Shin-Il Kim
- †School of Applied Chemical Engineering, Major in Polymer Science and Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
| | - Young-Jae Jin
- †School of Applied Chemical Engineering, Major in Polymer Science and Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
| | - Toshikazu Sakaguchi
- ‡Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo 3-9-1, Fukui 910-8507, Japan
| | - Wang-Eun Lee
- §Reliability Assessment Center for Chemical Materials Korea Research Institute of Chemical Technology(KRICT) 141, Gajeong-ro, Yuseong-gu, Daejeon 305-600, Korea
| | - Giseop Kwak
- †School of Applied Chemical Engineering, Major in Polymer Science and Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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Lee WE, Jin YJ, Kim SI, Kwak G, Kim JH, Sakaguchi T, Lee CL. Fluorescence turn-on response of a conjugated polyelectrolyte with intramolecular stack structure to biomacromolecules. Chem Commun (Camb) 2013; 49:9857-9. [DOI: 10.1039/c3cc45538f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lee WE, Jin YJ, Park LS, Kwak G. Fluorescent actuator based on microporous conjugated polymer with intramolecular stack structure. Adv Mater 2012; 24:5604-5609. [PMID: 22887811 DOI: 10.1002/adma.201201967] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 07/04/2012] [Indexed: 06/01/2023]
Affiliation(s)
- Wang-Eun Lee
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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Lee WE, Han DC, Sakaguchi T, Kim YB, Lee CL, Kwak G. Finely Tuned Fluorescence Emission of Polydiphenylacetylene Films Obtained by Copolymerization. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201200427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Lee D, Jin YJ, Kim H, Suzuki N, Fujiki M, Sakaguchi T, Kim SK, Lee WE, Kwak G. Solvent-to-Polymer Chirality Transfer in Intramolecular Stack Structure. Macromolecules 2012. [DOI: 10.1021/ma300976r] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Daehoon Lee
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku,
Daegu 702-701, Korea
| | - Young-Jae Jin
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku,
Daegu 702-701, Korea
| | - Hyojin Kim
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku,
Daegu 702-701, Korea
| | - Nozomu Suzuki
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101,
Japan
| | - Michiya Fujiki
- Graduate
School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101,
Japan
| | - Toshikazu Sakaguchi
- Department of Materials
Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan
| | - Seog K. Kim
- Department of Chemistry, Yeungnam University, Kyoungsan City, Kyoung-buk 712-749,
Korea
| | - Wang-Eun Lee
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku,
Daegu 702-701, Korea
| | - Giseop Kwak
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku,
Daegu 702-701, Korea
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Lee D, Kim H, Suzuki N, Fujiki M, Lee CL, Lee WE, Kwak G. Optically active, lyotropic liquid crystalline poly(diphenylacetylene) derivative: hierarchical chiral ordering from isotropic solution to anisotropic solid films. Chem Commun (Camb) 2012; 48:9275-7. [DOI: 10.1039/c2cc34513g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Han DH, Lee WE, Kim SJ, Park SD, Kwak G. Solvent-driven reorganization of poly(diphenylacetylene) in film and nanofiber by means of swelling method: solvent annealing effects on fluorescence emission properties and microstructures. Polym Bull (Berl) 2011. [DOI: 10.1007/s00289-011-0691-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Park H, Han DC, Han DH, Kim SJ, Lee WE, Kwak G. Emission Enhancement, Photooxidative Stability, and Fluorescence Image Patterning of Conjugated Polymer Film via in Situ Hybridization with UV-Curable Acrylate Monomers. Macromolecules 2011. [DOI: 10.1021/ma2017327] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyosang Park
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
| | - Dong-Cheul Han
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
- Gumi Electronics and Information Technology Research Institute, Gumi, Gyeongsangbuk-do 730-853, Korea
| | - Dong-Hee Han
- Korea Electrotechnology Research Institute, 28-1 Seongju-dong, Changwon-si, Gyeongsangnam-do 641-120, Korea
| | - Suk-Joon Kim
- Korea Electrotechnology Research Institute, 28-1 Seongju-dong, Changwon-si, Gyeongsangnam-do 641-120, Korea
| | - Wang-Eun Lee
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
| | - Giseop Kwak
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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Lee WE, Han DC, Han DH, Choi HJ, Sakaguchi T, Lee CL, Kwak G. Remarkable Change in Fluorescence Emission of Poly(diphenylacetylene) Film via in situ Desilylation Reaction: Correlation with Variations in Microporous Structure, Chain Conformation, and Lamellar Layer Distance. Macromol Rapid Commun 2011; 32:1047-51. [DOI: 10.1002/marc.201100073] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 04/25/2011] [Indexed: 11/05/2022]
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Lee WE, Lee CL, Sakaguchi T, Fujiki M, Kwak G. Fluorescent Viscosity Sensor Film of Molecular-Scale Porous Polymer with Intramolecular π-Stack Structure. Macromolecules 2011. [DOI: 10.1021/ma102798j] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Wang-Eun Lee
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
| | - Chang-Lyoul Lee
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
| | - Toshikazu Sakaguchi
- Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan
| | - Michiya Fujiki
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Giseop Kwak
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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Lee WE, Park H, Kwak G. Solvent-assisted, accelerated photobleaching and fluorescence recovery of conjugated polymer film. Chem Commun (Camb) 2011; 47:659-61. [DOI: 10.1039/c0cc04512h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lee WE, Lee CL, Sakaguchi T, Fujiki M, Kwak G. Piezochromic fluorescence in liquid crystalline conjugated polymers. Chem Commun (Camb) 2011; 47:3526-8. [DOI: 10.1039/c0cc04811a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Park H, Jeong H, Lee WE, Yoon KB, Oh CJ, Kwak G. Positive-/Negative-, Erasable-/Immobilized-, Mono-/Multi-Color Fluorescence Image Patterning of Molecular-Scale Porous Polymer Film via a Microcontact Printing Method Using Various Chemical Inks. Macromol Rapid Commun 2010; 32:360-5. [DOI: 10.1002/marc.201000623] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Revised: 10/25/2010] [Indexed: 11/07/2022]
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Lee WE, Oh CJ, Kang IK, Kwak G. Macromol. Chem. Phys. 17/2010. MACROMOL CHEM PHYS 2010. [DOI: 10.1002/macp.201090040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lee WE, Oh CJ, Kang IK, Kwak G. Diphenylacetylene Polymer Nanofiber Mats Fabricated by Freeze Drying: Preparation and Application for Explosive Sensors. MACROMOL CHEM PHYS 2010. [DOI: 10.1002/macp.201000216] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lee WE, Kim JW, Oh CJ, Sakaguchi T, Fujiki M, Kwak G. Correlation of Intramolecular Excimer Emission with Lamellar Layer Distance in Liquid-Crystalline Polymers: Verification by the Film-Swelling Method. Angew Chem Int Ed Engl 2010; 49:1406-9. [DOI: 10.1002/anie.200906621] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Lee WE, Kim JW, Oh CJ, Sakaguchi T, Fujiki M, Kwak G. Correlation of Intramolecular Excimer Emission with Lamellar Layer Distance in Liquid-Crystalline Polymers: Verification by the Film-Swelling Method. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lee WE, Oh CJ, Park GT, Kim JW, Choi HJ, Sakaguchi T, Fujiki M, Nakao A, Shinohara KI, Kwak G. Substitution position effect on photoluminescence emission and chain conformation of poly(diphenylacetylene) derivatives. Chem Commun (Camb) 2010; 46:6491-3. [DOI: 10.1039/c0cc01481h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jeong H, Lee WE, Kwak G. Enhancements in Emission and Chemical Resistance of Substituted Acetylene Polymer via in Situ Sol−Gel Reaction in Film. Macromolecules 2009. [DOI: 10.1021/ma902543x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Heejun Jeong
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
| | - Wang-Eun Lee
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
| | - Giseop Kwak
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea
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Kwak G, Lee WE, Kim WH, Lee H. Fluorescence imaging of latent fingerprints on conjugated polymer films with large fractional free volume. Chem Commun (Camb) 2009:2112-4. [DOI: 10.1039/b902316j] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kwak G, Lee WE, Jeong H, Sakaguchi T, Fujiki M. Swelling-Induced Emission Enhancement in Substituted Acetylene Polymer Film with Large Fractional Free Volume: Fluorescence Response to Organic Solvent Stimuli. Macromolecules 2008. [DOI: 10.1021/ma802506x] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giseop Kwak
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea; Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan; and Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Wang-Eun Lee
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea; Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan; and Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Heejun Jeong
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea; Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan; and Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Toshikazu Sakaguchi
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea; Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan; and Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Michiya Fujiki
- Department of Polymer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Daegu 702-701, Korea; Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, Bunkyo, Fukui 910-8507, Japan; and Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
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Jackson C, Lee WE. ACUTE MASSIVE COLLAPSE OF THE LUNGS: A DISCUSSION OF ITS MECHANISM AND OF ITS RELATION TO FOREIGN BODIES IN THE BRONCHI AND POST-OPERATIVE COMPLICATIONS. Ann Surg 2007; 82:364-89. [PMID: 17865326 PMCID: PMC1400337 DOI: 10.1097/00000658-192509010-00005] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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