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Cho YS, Lee JW, Jung Y, Park JY, Park JS, Kim SM, Yang SJ, Park CR. Super-Toughness Carbon Nanotube Yarns by Bio-Inspired Nano-Coiling Engineering. Adv Sci (Weinh) 2024:e2400460. [PMID: 38654622 DOI: 10.1002/advs.202400460] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 04/03/2024] [Indexed: 04/26/2024]
Abstract
Lightweight structural materials are commonly used as effective fillers for advanced composites with high toughness. This study focused on enhancing the toughness of direct-spun carbon nanotube yarns (CNTYs) by controlling the micro-textural structure using a water-gap-based direct spinning. Drawing inspiration from the structural features of natural spider silk fibroin, characterized by an α-helix in the amorphous region and β-sheet in the crystalline region, multiscale bundles within CNTYs are reorganized into a unique nano-coil-like structure. This nano-coiled structure facilitated the efficient dissipation of external mechanical loads through densification with the rearrangement of multiscale bundles, improving specific strength and strain. The resulting CNTYs exhibited exceptional mechanical properties with toughness reaching 250 J g-1, making them promising alternatives to commercially available fibers in lightweight, high-toughness applications. These findings highlight the significance of nano-coiling engineering for emulating bio-inspired micro-textural structures, achieving remarkable enhancement in the toughness of CNTYs.
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Affiliation(s)
- Young Shik Cho
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Wanju, 55324, Republic of Korea
| | - Jae Won Lee
- Department of Materials Science & Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea
| | - Yeonsu Jung
- Composite Research Division, Korea Institute of Materials Science (KIMS), Changwon, 51508, Republic of Korea
| | - Ji Yong Park
- Department of Chemistry & Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon, 22212, Republic of Korea
| | - Jae Seo Park
- Department of Chemistry & Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon, 22212, Republic of Korea
| | - Sang Min Kim
- Department of Chemistry & Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon, 22212, Republic of Korea
| | - Seung Jae Yang
- Department of Chemistry & Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon, 22212, Republic of Korea
| | - Chong Rae Park
- Department of Materials Science & Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea
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Jung Y, Cho YS, Park JH, Cheon JY, Lee JW, Kim JH, Park CR, Kim T, Yang SJ. Selective Interbundle Cross-Linking for Lightweight and Superstrong Carbon Nanotube Yarns. Nano Lett 2023; 23:3128-3136. [PMID: 36951295 DOI: 10.1021/acs.nanolett.2c04068] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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
In this study, a range of carbon nanotube yarn (CNTY) architectures was examined and controlled by chemical modification to gain a deeper understanding of CNTY load-bearing systems and produce lightweight and superstrong CNTYs. The architecture of CNTY, which has polymer layers surrounding a compact bundle without hampering the original state of the CNTs in the bundle, is a favorable design for further chemical cross-linking and for enhancing the load-transfer efficiency, as confirmed by in situ Raman spectroscopy under a stress load. The resulting CNTY exhibited excellent mechanical performance that exceeded the specific strength of the benchmark, high-performance fibers. This exceptional strength of the CNTY makes it a promising candidate for the cable of a space elevator traveling from the Earth to the International Space Station given its strength of 4.35 GPa/(g cm-3), which can withstand the self-weight of a 440 km cable.
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Affiliation(s)
- Yeonsu Jung
- Composite Research Division, Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea
| | - Young Shik Cho
- Composite Research Division, Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jae Hyun Park
- Department of Aerospace and Software Engineering, Gyeongsang National University, 501 Jinju-daero, Jinju, Gyeongnam 52828, Republic of Korea
| | - Jae Yeong Cheon
- Composite Research Division, Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea
| | - Jae Won Lee
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jae Ho Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Advanced Nanohybrids Laboratory, Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Taehoon Kim
- Composite Research Division, Korea Institute of Materials Science (KIMS), Changwon 51508, Republic of Korea
| | - Seung Jae Yang
- Advanced Nanohybrids Laboratory, Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University, Incheon 22212, Republic of Korea
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Cho YS, Lee JW, Kim J, Jung Y, Yang SJ, Park CR. Superstrong Carbon Nanotube Yarns by Developing Multiscale Bundle Structures on the Direct Spin-Line without Post-Treatment. Adv Sci (Weinh) 2023; 10:e2204250. [PMID: 36404109 PMCID: PMC9839856 DOI: 10.1002/advs.202204250] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 11/04/2022] [Indexed: 05/16/2023]
Abstract
Super strong fibers, such as carbon or aramid fibers, have long been used as effective fillers for advanced composites. In this study, the highest tensile strength of 5.5 N tex-1 for carbon nanotube yarns (CNTYs) is achieved by controlling the micro-textural structure through a facile and eco-friendly bundle engineering process in direct spinning without any post-treatment. Inspired by the strengthening mechanism of the hierarchical fibrillary structure of natural cellulose fiber, this study develops multiscale bundle structures in CNTYs whereby secondary bundles, ≈200 nm in thickness, evolve from the assembly of elementary bundles, 30 nm in thickness, without any damage, which is a basic load-bearing element in CNTY. The excellent mechanical performance of these CNTYs makes them promising substitutes for the benchmark, lightweight, and super strong commercial fibers used for energy-saving structural materials. These findings address how the tensile strength of CNTY can be improved without additional post-treatment in the spinning process if the development of the aforementioned secondary bundles and the corresponding orientations are properly engineered.
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Affiliation(s)
- Young Shik Cho
- Department of Materials Science & Engineering and Research Institute of Advanced MaterialsSeoul National UniversitySeoul08826Republic of Korea
- Composite Research DivisionKorea Institute of Materials Science (KIMS)Changwon51508Republic of Korea
| | - Jae Won Lee
- Department of Materials Science & Engineering and Research Institute of Advanced MaterialsSeoul National UniversitySeoul08826Republic of Korea
| | - Jaewook Kim
- Department of Materials Science & Engineering and Research Institute of Advanced MaterialsSeoul National UniversitySeoul08826Republic of Korea
| | - Yeonsu Jung
- Composite Research DivisionKorea Institute of Materials Science (KIMS)Changwon51508Republic of Korea
| | - Seung Jae Yang
- Department of Chemistry & Chemical EngineeringEducation and Research Center for Smart Energy and MaterialsInha UniversityIncheon22212Republic of Korea
| | - Chong Rae Park
- Department of Materials Science & Engineering and Research Institute of Advanced MaterialsSeoul National UniversitySeoul08826Republic of Korea
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Chang MS, Kwon SJ, Jeong JW, Ryu SH, Jeong SJ, Lee K, Kim T, Yang S, Park CR, Park B, Kwon YT. Electromagnetic Wave Absorbing, Thermal-Conductive Flexible Membrane with Shape-Modulated FeCo Nanobelts. ACS Appl Mater Interfaces 2022; 14:39255-39264. [PMID: 35975758 DOI: 10.1021/acsami.2c11094] [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: 06/15/2023]
Abstract
Electromagnetic wave (EMW)-absorbing materials, manufactured with composites of magnetic particles, are essential for maintaining a high complex permeability and modulated permittivity for impedance matching. However, commonly available EMW-absorbing materials are unsatisfactory owing to their low complex permeability in the high-frequency band. Herein, we report a thin, flexible EMW-absorbing membrane comprising shape-modulated FeCo nanobelts/boron nitride nanoparticles, which enables enhanced complex permeability in the S, C, and X bands (2-12 GHz). The boron nitride nanoparticles that are introduced to the FeCo nanobelts demonstrate control of the complex permittivity, leading to an effective impedance matching close to 1, consequently resulting in a high reflection loss value of -42.2 dB at 12.0 GHz with only 1.6 mm thickness. In addition, the incorporation of boron nitride nanoparticles improves the thermal conductivity for the heat dissipation of the absorbed electromagnetic wave energy. Overall, the comprehensive study of nanomaterial preparation and shape modulation technologies can lead to the fabrication of an excellent EMW-absorbing flexible composite membrane.
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Affiliation(s)
- Mi Se Chang
- Metal Powder Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea
| | - Suk Jin Kwon
- Functional Composites Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Jae Won Jeong
- Metal Powder Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Seung Han Ryu
- Functional Composites Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Seung Jae Jeong
- Metal Powder Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Kyunbae Lee
- Functional Composites Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Taehoon Kim
- Functional Composites Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Sangsun Yang
- Metal Powder Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, South Korea
| | - Byeongjin Park
- Functional Composites Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
| | - Young-Tae Kwon
- Metal Powder Department, Korea Institute of Materials Science (KIMS), Changwon 51508, South Korea
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Park JH, Oh YJ, Park DY, Lee J, Park JS, Park CR, Kim JH, Kim T, Yang SJ. A New Class of Carbon Nanostructures for High-Performance Electro-Magnetic and -Chemical Barriers. Adv Sci (Weinh) 2022; 9:e2200055. [PMID: 35166063 PMCID: PMC8844487 DOI: 10.1002/advs.202200055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
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Park JH, Oh YJ, Park DY, Lee J, Park JS, Park CR, Kim JH, Kim T, Yang SJ. A New Class of Carbon Nanostructures for High-Performance Electro-Magnetic and -Chemical Barriers. Adv Sci (Weinh) 2021; 8:e2102718. [PMID: 34590441 PMCID: PMC8596133 DOI: 10.1002/advs.202102718] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/18/2021] [Indexed: 06/13/2023]
Abstract
It is of importance to explore a new carbon nanomaterial possessing vital functions to fulfill the high standards for practical achievement of the electromagnetic (EM) barrier for blocking EM waves and the electrochemical (EC) barrier as a functional separator for EC energy storage. Herein, facile synthesis of a new class of carbon nanostructures, which consist of interconnected N-doped graphitic carbon nanocubes partially embedded by nickel nanoparticles, is described. The hollow interior of graphitic nanocube induces internal reflection of EM waves and confines active materials of EC energy storage. Nitrogen functionalities implanted in graphitic structure enhance electrical conductivity as well as improve chemical interaction with active materials. Furthermore, nickel nanoparticles in graphitic nanocube function as an EM wave-absorbing material and an electrocatalyst for EC energy storage. Through comprehensive assessments, remarkable performances originating from distinctive nanostructures give new insights into structural design for the carbon nanostructure-based high-performance EM and EC barriers.
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Affiliation(s)
- Jae Hui Park
- Advanced Nanohybrids LaboratoryDepartment of Chemistry and Chemical EngineeringEducation and Research Center for Smart Energy and MaterialsInha UniversityIncheon22212Republic of Korea
| | - Yun Ji Oh
- Advanced Nanohybrids LaboratoryDepartment of Chemistry and Chemical EngineeringEducation and Research Center for Smart Energy and MaterialsInha UniversityIncheon22212Republic of Korea
| | - Dong Yoon Park
- Carbon Nanomaterials Design LaboratoryResearch Institute of Advanced MaterialsDepartment of Materials Science and EngineeringSeoul National UniversitySeoul08826Republic of Korea
| | - Joonsik Lee
- Composites Research DivisionKorea Institute of Materials Science (KIMS)Changwon51508Republic of Korea
| | - Jae Seo Park
- Advanced Nanohybrids LaboratoryDepartment of Chemistry and Chemical EngineeringEducation and Research Center for Smart Energy and MaterialsInha UniversityIncheon22212Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design LaboratoryResearch Institute of Advanced MaterialsDepartment of Materials Science and EngineeringSeoul National UniversitySeoul08826Republic of Korea
| | - Jae Ho Kim
- Advanced Nanohybrids LaboratoryDepartment of Chemistry and Chemical EngineeringEducation and Research Center for Smart Energy and MaterialsInha UniversityIncheon22212Republic of Korea
- Carbon Nanomaterials Design LaboratoryResearch Institute of Advanced MaterialsDepartment of Materials Science and EngineeringSeoul National UniversitySeoul08826Republic of Korea
| | - Taehoon Kim
- Composites Research DivisionKorea Institute of Materials Science (KIMS)Changwon51508Republic of Korea
| | - Seung Jae Yang
- Advanced Nanohybrids LaboratoryDepartment of Chemistry and Chemical EngineeringEducation and Research Center for Smart Energy and MaterialsInha UniversityIncheon22212Republic of Korea
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Lee T, Lee JW, Park KT, Kim JS, Park CR, Kim H. Nanostructured Inorganic Chalcogenide-Carbon Nanotube Yarn having a High Thermoelectric Power Factor at Low Temperature. ACS Nano 2021; 15:13118-13128. [PMID: 34279909 DOI: 10.1021/acsnano.1c02508] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
As power-conversion devices, flexible thermoelectrics that enable conformal contact with heat sources of arbitrary shape are attractive. However, the low performance of flexible thermoelectric materials, which does not exceed those of brittle inorganic counterparts, hampers their practical applications. Herein, we propose inorganic chalcogenide-nanostructured carbon nanotube (CNT) yarns with outstanding power factor at a low temperature using electrochemical deposition. The inorganic chalcogenide-nanostructured CNT yarns exhibit the power factors of 3425 and 2730 μW/(m·K2) at 298 K for the p- and n-type, respectively, which is higher than those of previously reported flexible TE materials. On the basis of excellent performance and geometry advantage of the nanostructured CNT yarn for modular design, all-CNT based thermoelectric generators have been easily fabricated, showing the maximum power densities of 24 and 380 mW/m2 at ΔT = 5 and 20 K, respectively. These results provide a promising strategy for the realization of high-performance flexible thermoelectric materials and devices for flexible/or wearable self-powering systems.
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Affiliation(s)
- Taemin Lee
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Jae Won Lee
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Kyung Tae Park
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jin-Sang Kim
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk 55324, Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Heesuk Kim
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
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Jang MS, Chang MS, Kwon YT, Yang S, Gwak J, Kwon SJ, Lee J, Song K, Park CR, Lee SB, Park B, Jeong JW. High-throughput thermal plasma synthesis of Fe xCo 1-x nano-chained particles with unusually high permeability and their electromagnetic wave absorption properties at high frequency (1-26 GHz). Nanoscale 2021; 13:12004-12016. [PMID: 34212957 DOI: 10.1039/d1nr01845k] [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] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Herein, we introduce novel 1-dimensional nano-chained FeCo particles with unusually-high permeability prepared by a highly-productive thermal plasma synthesis and demonstrate an electromagnetic wave absorber with exceptionally low reflection loss in the high-frequency regime (1-26 GHz). During the thermal plasma synthesis, spherical FeCo nanoparticles are first formed through the nucleation and growth processes; then, the high temperature zone of the thermal plasma accelerates the diffusion of constituent elements, leading to surface-consolidation between the particles at the moment of collision, and 1-dimensional nano-chained particles are successfully fabricated without the need for templates or a complex directional growth process. Systematic control over the composition and magnetic properties of FexCo1-x nano-chained particles also has been accomplished by changing the mixing ratio of the Fe-to-Co precursors, i.e. from 7 : 3 to 3 : 7, leading to a remarkably high saturation magnetization of 151-227 emu g-1. In addition, a precisely-controlled and uniform surface SiO2 coating on the FeCo nano-chained particles was found to effectively modulate complex permittivity. Consequently, a composite electromagnetic wave absorber comprising Fe0.6Co0.4 nano-chained particles with 2.00 nm-thick SiO2 surface insulation exhibits dramatically intensified permeability, thereby improving electromagnetic absorption performance with the lowest reflection loss of -43.49 dB and -10 dB (90% absorbance) bandwidth of 9.28 GHz, with a minimum thickness of 0.85 mm.
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Affiliation(s)
- Min-Sun Jang
- Metal Powder Department, Korea Institute of Materials Science (KIMS), 797 Changwondae-ro, Seongsan-gu, Changwon 51508, Korea.
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Park HY, Park CR, Suh CH, Kim MJ, Shim WH, Kim SJ. Prognostic Utility of Disproportionately Enlarged Subarachnoid Space Hydrocephalus in Idiopathic Normal Pressure Hydrocephalus Treated with Ventriculoperitoneal Shunt Surgery: A Systematic Review and Meta-analysis. AJNR Am J Neuroradiol 2021; 42:1429-1436. [PMID: 34045302 DOI: 10.3174/ajnr.a7168] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 03/17/2021] [Indexed: 01/22/2023]
Abstract
BACKGROUND Disproportionately enlarged subarachnoid space hydrocephalus is a specific radiologic marker for idiopathic normal pressure hydrocephalus. However, controversy exists regarding the prognostic utility of disproportionately enlarged subarachnoid space hydrocephalus. PURPOSE Our aim was to evaluate the prevalence of disproportionately enlarged subarachnoid space hydrocephalus in idiopathic normal pressure hydrocephalus and its predictive utility regarding prognosis in patients treated with ventriculoperitoneal shunt surgery. DATA SOURCES We used MEDLINE and EMBASE databases. STUDY SELECTION We searched for studies that reported the prevalence or the diagnostic performance of disproportionately enlarged subarachnoid space hydrocephalus in predicting treatment response. DATA ANALYSIS The pooled prevalence of disproportionately enlarged subarachnoid space hydrocephalus was obtained. Pooled sensitivity, specificity, and area under the curve of disproportionately enlarged subarachnoid space hydrocephalus to predict treatment response were obtained. Subgroup and sensitivity analyses were performed to explain heterogeneity among the studies. DATA SYNTHESIS Ten articles with 812 patients were included. The pooled prevalence of disproportionately enlarged subarachnoid space hydrocephalus in idiopathic normal pressure hydrocephalus was 44% (95% CI, 34%-54%). The pooled prevalence of disproportionately enlarged subarachnoid space hydrocephalus was higher in the studies using the second edition of the Japanese Guidelines for Management of Idiopathic Normal Pressure Hydrocephalus compared with the studies using the international guidelines without statistical significance (52% versus 43%, P = .38). The pooled sensitivity and specificity of disproportionately enlarged subarachnoid space hydrocephalus for prediction of treatment response were 59% (95% CI, 38%-77%) and 66% (95% CI, 57%-74%), respectively, with an area under the curve of 0.67 (95% CI, 0.63-0.71). LIMITATIONS The lack of an established method for assessing disproportionately enlarged subarachnoid space hydrocephalus using brain MR imaging served as an important cause of the heterogeneity. CONCLUSIONS Our meta-analysis demonstrated a relatively low prevalence of disproportionately enlarged subarachnoid space hydrocephalus in idiopathic normal pressure hydrocephalus and a poor diagnostic performance for treatment response.
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Affiliation(s)
- H Y Park
- From the Department of Radiology and Research Institute of Radiology (H.Y.P., C.H.S., M.J.K., W.H.S., S.J.K.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - C R Park
- Department of Medical Science (C.R.P.) Asan Medical Institute of Convergence Science and Technology, University of Ulsan College of Medicine, Seoul, Korea
| | - C H Suh
- From the Department of Radiology and Research Institute of Radiology (H.Y.P., C.H.S., M.J.K., W.H.S., S.J.K.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - M J Kim
- From the Department of Radiology and Research Institute of Radiology (H.Y.P., C.H.S., M.J.K., W.H.S., S.J.K.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - W H Shim
- From the Department of Radiology and Research Institute of Radiology (H.Y.P., C.H.S., M.J.K., W.H.S., S.J.K.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S J Kim
- From the Department of Radiology and Research Institute of Radiology (H.Y.P., C.H.S., M.J.K., W.H.S., S.J.K.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Park KT, Lee T, Ko Y, Cho YS, Park CR, Kim H. High-Performance Thermoelectric Fabric Based on a Stitched Carbon Nanotube Fiber. ACS Appl Mater Interfaces 2021; 13:6257-6264. [PMID: 33508940 DOI: 10.1021/acsami.0c20252] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
With the continuous development of flexible and wearable thermoelectric generators (TEGs), high-performance materials and their integration into convenient wearable devices have to be considered. Herein, we have demonstrated highly aligned wet-spun carbon nanotube (CNT) fibers by optimizing the liquid crystalline (LC) phase via hydrochloric acid purification. The liquid crystalline phase facilitates better alignment of CNTs during fiber extrusion, resulting in the high power factor of 2619 μW m-1 K-2, which surpasses those of the dry-spun CNT yarns. A flexible all-carbon TEG was fabricated by stitching a single CNT fiber and doping selected segments into n-type by simple injection doping. The flexible TEG shows the maximum output power densities of 1.9 mW g-1 and 10.3 mW m-2 at ΔT = 30 K. Furthermore, the flexible TEG was developed into a prototype watch-strap TEG, demonstrating easy wearability and direct harvesting of body heat into electrical energy. Combining high-performance materials with scalable fabrication methods ensures the great potential for flexible/or wearable TEGs to be utilized as future power-conversion devices.
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Affiliation(s)
- Kyung Tae Park
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Taemin Lee
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Youngpyo Ko
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea
| | - Young Shik Cho
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Heesuk Kim
- Soft Hybrid Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Republic of Korea
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Shin MC, Kim JH, Nam S, Oh YJ, Jin HJ, Park CR, Zhang Q, Yang SJ. Atomic-Distributed Coordination State of Metal-Phenolic Compounds Enabled Low Temperature Graphitization for High-Performance Multioriented Graphite Anode. Small 2020; 16:e2003104. [PMID: 32583953 DOI: 10.1002/smll.202003104] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Indexed: 06/11/2023]
Abstract
Continuous efforts have been made to achieve nanostructured carbon materials with highly ordered graphitic structures using facile synthetic methods. 3D graphite nanoballs (GNBs) are synthesized by the low-temperature pyrolysis of a non-graphitizable precursor, tannic acid (TA). Abundant phenol groups on TA bind to Ni2+ to form metal-phenolic coordination, which renders each Ni cation to be atomically distributed by the TA ligands. Even at low temperatures (1000 °C), highly ordered graphitic structure is promoted by the distributed Ni nanoparticles that act as a graphitization catalyzer. The crystallinity of the GNB is fully corroborated by the intense 2D peak observed in Raman spectroscopy. In particular, the graphitic layers have orientations pointing toward multidirections, which are beneficial for the rapid transport of Li-ions into graphite grains. The resulting materials exhibit outstanding electrochemical performance (120 mAh g-1 at 5 C and 282 mAh g-1 at 0.5 C after 500 cycles) when evaluated as a fast-chargeable negative electrode for lithium ion batteries.
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Affiliation(s)
- Min Chang Shin
- Advanced Nanohybrids Laboratory, Department of Chemical Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Jae Ho Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Seunghoon Nam
- Department of Materials Science and Engineering, Andong National University, Andong, 36729, Republic of Korea
| | - Yun Ji Oh
- Advanced Nanohybrids Laboratory, Department of Chemical Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Hyoung-Joon Jin
- Department of Polymer Science and Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Qiang Zhang
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Seung Jae Yang
- Advanced Nanohybrids Laboratory, Department of Chemical Engineering, Inha University, Incheon, 22212, Republic of Korea
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Lee H, Lee DJ, Kim M, Kim H, Cho YS, Kwon HJ, Lee HC, Park CR, Im D. High-Energy Density Li-O 2 Battery with a Polymer Electrolyte-Coated CNT Electrode via the Layer-by-Layer Method. ACS Appl Mater Interfaces 2020; 12:17385-17395. [PMID: 32212667 DOI: 10.1021/acsami.9b21962] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Li-O2 batteries have attracted considerable attention for several decades due to their high theoretical energy density (>3400 Wh/kg). However, it has not been clearly demonstrated that their actual volumetric and gravimetric energy densities are higher than those of Li-ion batteries. In previous studies, a considerable quantity of electrolyte was usually employed in preparing Li-O2 cells. In general, the electrolyte was considerably heavier than the carbon materials in the cathode, rendering the practical energy density of the Li-O2 battery lower than that of the Li-ion battery. Therefore, air cathodes with significantly smaller electrolyte quantities need to be developed to achieve a high specific energy density in Li-O2 batteries. In this study, we propose a core-shell-structured cathode material with a gel-polymer electrolyte layer covering the carbon nanotubes (CNTs). The CNTs are synthesized using the floating catalyst chemical vapor deposition method. The polymeric layer corresponding to the shell is prepared by the layer-by-layer (LbL) coating method, utilizing Li-Nafion along with PDDA-Cl [poly(diallyldimethylammonium chloride)]. Several bilayers of Li-Nafion and PDDA, on the CNT surface, are successfully prepared and characterized via X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The porous structure of the CNTs is retained after the LbL process, as confirmed by the nitrogen adsorption-desorption profile and BJH pore-size distribution analysis. This porous structure can function as an oxygen channel for facilitating the transport of oxygen molecules for reacting with the Li ions on the cathode surface. These polymeric bilayers can provide an Li-ion pathway, after absorbing a small quantity of an ionic liquid electrolyte, 0.5 M LiTFSI EMI-TFSI [1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide]. Compared to a typical cathode, where only liquid electrolytes are employed, the total quantity of electrolyte in the cathode can be significantly reduced; thereby, the overall cell energy density can be increased. A Li-O2 battery with this core-shell-structured cathode exhibited a high energy density of approximately 390 Wh/kg, which was assessed by directly weighing all of the cell components together, including the gas diffusion layer, the interlayer [a separator containing a mixture of LiTFSI, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (PYR-14), and PDDA-TFSI], the lithium anode, and the LbL-CNT cathode. The cycle life of the LbL-CNT-based cathode was found to be 31 cycles at a limited capacity of 500 mAh/gcarbon. Although this is not an excellent performance, it is almost 2 times better than that of a CNT cathode without a polymer coating.
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Affiliation(s)
- Hyunpyo Lee
- Samsung Advanced Institute of Technology (SAIT), Samsung Future Technology Campus, Samsung Electronics Company, Ltd., 130 Samsung-ro, Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
| | - Dong Joon Lee
- Samsung Advanced Institute of Technology (SAIT), Samsung Future Technology Campus, Samsung Electronics Company, Ltd., 130 Samsung-ro, Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
| | - Mokwon Kim
- Samsung Advanced Institute of Technology (SAIT), Samsung Future Technology Campus, Samsung Electronics Company, Ltd., 130 Samsung-ro, Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
| | - Hyunjin Kim
- Samsung Advanced Institute of Technology (SAIT), Samsung Future Technology Campus, Samsung Electronics Company, Ltd., 130 Samsung-ro, Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
| | - Young Shik Cho
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyuk Jae Kwon
- Samsung Advanced Institute of Technology (SAIT), Samsung Future Technology Campus, Samsung Electronics Company, Ltd., 130 Samsung-ro, Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
| | - Heung Chan Lee
- Samsung Advanced Institute of Technology (SAIT), Samsung Future Technology Campus, Samsung Electronics Company, Ltd., 130 Samsung-ro, Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Dongmin Im
- Samsung Advanced Institute of Technology (SAIT), Samsung Future Technology Campus, Samsung Electronics Company, Ltd., 130 Samsung-ro, Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
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13
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So SH, Jang JH, Sung SJ, Yang SJ, Nam KT, Park CR. Demonstration of the nanosize effect of carbon nanomaterials on the dehydrogenation temperature of ammonia borane. Nanoscale Adv 2019; 1:4697-4703. [PMID: 36133104 PMCID: PMC9416807 DOI: 10.1039/c9na00501c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 10/10/2019] [Indexed: 06/16/2023]
Abstract
Ammonia borane (AB, NH3BH3) is a highly promising hydrogen storage material, but its high dehydrogenation temperature hinders its wide use in practice. The infiltration of AB into the pores of porous materials can lower the dehydrogenation temperature by what is known as the nanoconfinement effect. Nonetheless, it is unclear as to whether this phenomenon stems from a catalytic effect or the nanosize effect. In this work, carbon nanomaterials with a uniform pore size and with inertness to AB were chosen as nanoscaffolds without catalytic sites to control the particle size of AB. It is proved experimentally that the dehydrogenation temperature of AB is inversely proportional to the reciprocal of the particle size, which means that the nanoconfinement effect can be caused solely by the nanosize effect without a catalytic effect.
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Affiliation(s)
- Soon Hyeong So
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University Seoul 08826 Republic of Korea
| | - Jun Ho Jang
- Department of Materials Science and Engineering, Seoul National University Seoul 08826 Republic of Korea
| | - Sae Jin Sung
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University Seoul 08826 Republic of Korea
| | - Seung Jae Yang
- Advanced Nanohybrids Laboratory, Department of Chemical Engineering, Inha University Incheon 22212 Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University Seoul 08826 Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University Seoul 08826 Republic of Korea
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Cho HI, Jeong YC, Kim JH, Cho YS, Kim T, Yang SJ, Park CR. Rational Design of 1D Partially Graphitized N-Doped Hierarchical Porous Carbon with Uniaxially Packed Carbon Nanotubes for High-Performance Lithium-Ion Batteries. ACS Nano 2018; 12:11106-11119. [PMID: 30380831 DOI: 10.1021/acsnano.8b05529] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
N-doped hierarchical porous carbon with uniaxially packed carbon nanotubes (CNTs) was prepared by copolymer single-nozzle electrospinning, carbonization, and KOH activation. Densely and uniaxially aligned CNTs improve the electrical conductivity and act as a structural scaffold, enhancing the electrochemical performance of the anode. A partially graphitized N-doped carbon shell, which has a rapid ion accessible pore network and abundant redox sites, was designed to expand the redox sites from the surface of the material to the whole material, including the inner part. As an anode, this material exhibited a superior reversible capacity of 1814.3 mA h g-1 at 50 mA g-1 and of 850.1 mA h g-1 at 1000 mA g-1. Furthermore, the reversible capacity decreased by only 36% after 400 cycles and showed superior rate capability to that of the same material without CNTs, indicating that the CNT acted successfully as a structural scaffold and enhanced the electrical conductivity. This study not only allowed the rational design of the ideal structure of CNT-based carbonaceous anode material, which has both a rapid ion accessible structure and fast electron-transfer path, but also shed light on a potential strategy by which to use CNTs to modify the nitrogen bonding configuration in N-doped carbon for better electrochemical performance.
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Affiliation(s)
- Hang In Cho
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Yo Chan Jeong
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Jae Ho Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Young Shik Cho
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Taehoon Kim
- Composite Research Division , Korea Institute of Materials Science (KIMS) , Changwon 51508 , Republic of Korea
| | - Seung Jae Yang
- Advanced Nanohybrids Lab. Department of Chemical Engineering , Inha University , Incheon 22212 , Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Republic of Korea
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15
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Choi MK, Yang J, Kim DC, Dai Z, Kim J, Seung H, Kale VS, Sung SJ, Park CR, Lu N, Hyeon T, Kim DH. Extremely Vivid, Highly Transparent, and Ultrathin Quantum Dot Light-Emitting Diodes. Adv Mater 2018; 30:1703279. [PMID: 29068560 DOI: 10.1002/adma.201703279] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 09/02/2017] [Indexed: 06/07/2023]
Abstract
Displaying information on transparent screens offers new opportunities in next-generation electronics, such as augmented reality devices, smart surgical glasses, and smart windows. Outstanding luminance and transparency are essential for such "see-through" displays to show vivid images over clear background view. Here transparent quantum dot light-emitting diodes (Tr-QLEDs) are reported with high brightness (bottom: ≈43 000 cd m-2 , top: ≈30 000 cd m-2 , total: ≈73 000 cd m-2 at 9 V), excellent transmittance (90% at 550 nm, 84% over visible range), and an ultrathin form factor (≈2.7 µm thickness). These superb characteristics are accomplished by novel electron transport layers (ETLs) and engineered quantum dots (QDs). The ETLs, ZnO nanoparticle assemblies with ultrathin alumina overlayers, dramatically enhance durability of active layers, and balance electron/hole injection into QDs, which prevents nonradiative recombination processes. In addition, the QD structure is further optimized to fully exploit the device architecture. The ultrathin nature of Tr-QLEDs allows their conformal integration on various shaped objects. Finally, the high resolution patterning of red, green, and blue Tr-QLEDs (513 pixels in.-1 ) shows the potential of the full-color transparent display.
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Affiliation(s)
- Moon Kee Choi
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jiwoong Yang
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Dong Chan Kim
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Zhaohe Dai
- Center for Mechanics of Solids, Structures and Materials, Department of Aerospace Engineering and Engineering Mechanics, Department of Biomedical Engineering, Texas Materials Institute, University of Texas at Austin, Austin, TX, 78712, USA
| | - Junhee Kim
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hyojin Seung
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Vinayak S Kale
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Sae Jin Sung
- Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Chong Rae Park
- Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Nanshu Lu
- Center for Mechanics of Solids, Structures and Materials, Department of Aerospace Engineering and Engineering Mechanics, Department of Biomedical Engineering, Texas Materials Institute, University of Texas at Austin, Austin, TX, 78712, USA
| | - Taeghwan Hyeon
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Dae-Hyeong Kim
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
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16
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Choi J, Jung Y, Yang SJ, Oh JY, Oh J, Jo K, Son JG, Moon SE, Park CR, Kim H. Flexible and Robust Thermoelectric Generators Based on All-Carbon Nanotube Yarn without Metal Electrodes. ACS Nano 2017; 11:7608-7614. [PMID: 28700205 DOI: 10.1021/acsnano.7b01771] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
As practical interest in flexible/or wearable power-conversion devices increases, the demand for high-performance alternatives to thermoelectric (TE) generators based on brittle inorganic materials is growing. Herein, we propose a flexible and ultralight TE generator (TEG) based on carbon nanotube yarn (CNTY) with excellent TE performance. The as-prepared CNTY shows a superior electrical conductivity of 3147 S/cm due to increased longitudinal carrier mobility derived from a highly aligned structure. Our TEG is innovative in that the CNTY acts as multifunctions in the same device. The CNTY is alternatively doped into n- and p-types using polyethylenimine and FeCl3, respectively. The highly conductive CNTY between the doped regions is used as electrodes to minimize the circuit resistance, thereby forming an all-carbon TEG without additional metal deposition. A flexible TEG based on 60 pairs of n- and p-doped CNTY shows the maximum power density of 10.85 and 697 μW/g at temperature differences of 5 and 40 K, respectively, which are the highest values among reported TEGs based on flexible materials. We believe that the strategy proposed here to improve the power density of flexible TEG by introducing highly aligned CNTY and designing a device without metal electrodes shows great potential for the flexible/or wearable power-conversion devices.
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Affiliation(s)
- Jaeyoo Choi
- Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Yeonsu Jung
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Seung Jae Yang
- Department of Applied Organic Materials Engineering, Inha University , Incheon 402-751, Republic of Korea
| | - Jun Young Oh
- Department of Applied Organic Materials Engineering, Inha University , Incheon 402-751, Republic of Korea
| | - Jinwoo Oh
- Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
| | - Kiyoung Jo
- Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
| | - Jeong Gon Son
- Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
| | - Seung Eon Moon
- Electronics and Telecommunications Research Institute (ETRI) , Daejeon 34129, Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Heesuk Kim
- Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea
- Nano-Materials and Engineering, Korea University of Science and Technology (UST) , Daejeon 34113, Republic of Korea
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17
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Kim YS, Oh JY, Kim JH, Shin MH, Jeong YC, Sung SJ, Park J, Yang SJ, Park CR. Crucial Role of Oxidation Debris of Carbon Nanotubes in Subsequent End-Use Applications of Carbon Nanotubes. ACS Appl Mater Interfaces 2017; 9:17552-17564. [PMID: 28460171 DOI: 10.1021/acsami.7b00667] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A facile purification method for oxidized carbon nanotubes (CNTs) is developed to preserve acidic carbon compounds (ACCs) for achieving high-quality dispersion of CNTs. The remaining ACCs, which originated from the surface destruction of CNTs during the oxidation process, are considered to play a crucial role in the dispersion of CNTs in water and various polar protic solvents. To elucidate the concrete role of ACCs, a direct titration method is applied to quantitatively investigate the degree of ionization of both CNTs and ACCs in their aqueous dispersions. While ACCs with strong carboxylic groups (pKa of around 2.9) are easily removed by the neutral or base washing of oxidized CNTs, which is common in the purification process, ACC-selective purification using acid washing preserves the ACCs attached to CNTs, thereby effectively stabilizing CNT dispersions in aqueous solutions. Additionally, the Hansen solubility parameters of ACC-preserved and ACC-removed CNTs were determined by the inverse gas chromatography method to estimate their miscibility in various solvents. The preserved ACCs significantly influenced the dispersibility of CNTs in polar protic solvents, which may widen the possible application of CNTs. Specifically, the ACC-preserved high-quality CNT dispersion produces high-performance CNT buckypaper with densely packed nanostructures. The Young's modulus and tensile strength of these buckypapers reach up to 12.0 and 91.0 MPa, respectively, which exceed those of ACC-removed CNTs in previous reports.
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Affiliation(s)
- Yern Seung Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Jun Young Oh
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
- Advanced Nanohybrids Laboratory, Department of Applied Organic Materials Engineering, Inha University , Incheon 22212, Republic of Korea
| | - Jae Ho Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Min Ho Shin
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Yo Chan Jeong
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Sae Jin Sung
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Jisoo Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
| | - Seung Jae Yang
- Advanced Nanohybrids Laboratory, Department of Applied Organic Materials Engineering, Inha University , Incheon 22212, Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University , Seoul 08826, Republic of Korea
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Oh JY, Jung Y, Cho YS, Choi J, Youk JH, Fechler N, Yang SJ, Park CR. Metal-Phenolic Carbon Nanocomposites for Robust and Flexible Energy-Storage Devices. ChemSusChem 2017; 10:1675-1682. [PMID: 28058792 DOI: 10.1002/cssc.201601615] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 12/09/2016] [Indexed: 06/06/2023]
Abstract
Future electronics applications such as wearable electronics depend on the successful construction of energy-storage devices with superior flexibility and high electrochemical performance. However, these prerequisites are challenging to combine: External forces often cause performance degradation, whereas the trade-off between the required nanostructures for strength and electrochemical performance only results in diminished energy storage. Herein, a flexible supercapacitor based on tannic acid (TA) and carbon nanotubes (CNTs) with a unique nanostructure is presented. TA was self-assembled on the surface of the CNTs by metal-phenolic coordination bonds, which provides the hybrid film with both high strength and high pseudocapacitance. Besides 17-fold increased mechanical strength of the final composite, the hybrid film simultaneously exhibits excellent flexibility and volumetric capacitance.
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Affiliation(s)
- Jun Young Oh
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Gwanak-ro 1, Seoul, 08826, Korea
- Department of Applied Organic Materials Engineering, Inha University, Inharo-100, Incheon, 22212, Korea
| | - Yeonsu Jung
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Gwanak-ro 1, Seoul, 08826, Korea
| | - Young Shik Cho
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Gwanak-ro 1, Seoul, 08826, Korea
| | - Jaeyoo Choi
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Gwanak-ro 1, Seoul, 08826, Korea
| | - Ji Ho Youk
- Department of Applied Organic Materials Engineering, Inha University, Inharo-100, Incheon, 22212, Korea
| | - Nina Fechler
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476, Potsdam, Research Campus Golm, Germany
| | - Seung Jae Yang
- Department of Applied Organic Materials Engineering, Inha University, Inharo-100, Incheon, 22212, Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Gwanak-ro 1, Seoul, 08826, Korea
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Park J, Kim YS, Sung SJ, Kim T, Park CR. Highly dispersible edge-selectively oxidized graphene with improved electrical performance. Nanoscale 2017; 9:1699-1708. [PMID: 28090610 DOI: 10.1039/c6nr05902c] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We prepared liquid phase exfoliated edge-selectively oxidized graphene (LPEOG) with a high concentration in water (∼14.7 mg ml-1) and a high ratio of a single layer (70%). The edge of graphite was selectively oxidized by step II oxidation of the modified Hummers method, and we subsequently exfoliated the edge-selectively oxidized graphite (EOG) into LPEOG. The edge selective oxidation of the LPEOG was confirmed by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), zeta-potentiometry, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The highly concentrated LPEOG ink can be used in solution processing such as simple drawing or spin casting. Reduced LPEOG showed a higher conductivity (120 000 S m-1) than that of reduced graphene oxide (68 800 S m-1) despite the small lateral size. A transparent conducting film prepared from the LPEOG ink showed a lower surface resistance (∼2.97 kΩ sq-1) at a higher transmittance (>83.0 %T) compared to those of the graphene oxide based film. These results indicate that preservation of π-conjugation of the basal plane of graphene is critical for electrical performance of graphene. Our method facilitates solution processing of graphene for a wide range of applications.
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Affiliation(s)
- Jisoo Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
| | - Yern Seung Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
| | - Sae Jin Sung
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
| | - Taehoon Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
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Sung SJ, Kim T, Park J, So SH, Choi J, Yang SJ, Park CR. Influence of the physicochemical characteristics of reduced graphene oxides on the gas permeability of the barrier films for organic electronics. Chem Commun (Camb) 2017; 53:6573-6576. [DOI: 10.1039/c7cc00991g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Preparation of large-size and pinhole-free rGOs led to the improved barrier performance and stability of organic solar cells.
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Affiliation(s)
- Sae Jin Sung
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
- Seoul
| | - Taehoon Kim
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
- Seoul
| | - Jisoo Park
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
- Seoul
| | - Soon Hyeong So
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
- Seoul
| | - Jaeyoo Choi
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
- Seoul
| | - Seung Jae Yang
- Department of Applied Organic Materials Engineering
- Inha University
- Incheon 22212
- Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
- Seoul
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21
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Lee J, Kim T, Jung Y, Jung K, Park J, Lee DM, Jeong HS, Hwang JY, Park CR, Lee KH, Kim SM. High-strength carbon nanotube/carbon composite fibers via chemical vapor infiltration. Nanoscale 2016; 8:18972-18979. [PMID: 27808334 DOI: 10.1039/c6nr06479e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this study, we have developed an efficient and scalable method for improving the mechanical properties of carbon nanotube (CNT) fibers. The mechanical properties of as-synthesized CNT fibers are primarily limited by their porous structures and the weak bonding between adjacent CNTs. These result in inefficient load transfer, leading to low tensile strength and modulus. In order to overcome these limitations, we have adopted chemical vapor infiltration (CVI) to efficiently fill the internal voids of the CNT fibers with carbon species which are thermally decomposed from gas phase hydrocarbon. Through the optimization of the processing time, temperature, and gas flow velocity, we have confirmed that carbon species formed by the thermal decomposition of acetylene (C2H2) gas successfully infiltrated into porous CNT fibers and densified them at relatively low temperatures (650-750 °C). As a result, after CVI processing of the as-synthesized CNT fibers under optimum conditions, the tensile strength and modulus increased from 0.6 GPa to 1.7 GPa and from 25 GPa to 127 GPa, respectively. The CVI technique, combined with the direct spinning of CNT fibers, can open up a route to the fast and scalable fabrication of high performance CNT/C composite fibers. In addition, the CVI technique is a platform technology that can be easily adapted into other nano-carbon based yarn-like fibers such as graphene fibers.
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Affiliation(s)
- Jaegeun Lee
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeonbuk 55324, South Korea.
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Jeong K, Park S, Lee YD, Kang CS, Kim HJ, Park H, Kwon IC, Kim J, Park CR, Kim S. Size-engineered biocompatible polymeric nanophotosensitizer for locoregional photodynamic therapy of cancer. Colloids Surf B Biointerfaces 2016; 144:303-310. [PMID: 27107384 DOI: 10.1016/j.colsurfb.2016.04.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 04/03/2016] [Accepted: 04/13/2016] [Indexed: 02/02/2023]
Abstract
Current approaches in use of water-insoluble photosensitizers for photodynamic therapy (PDT) of cancer often demand a nano-delivery system. Here, we report a photosensitizer-loaded biocompatible nano-delivery formulation (PPaN-20) whose size was engineered to ca. 20nm to offer improved cell/tissue penetration and efficient generation of cytotoxic singlet oxygen. PPaN-20 was fabricated through the physical assembly of all biocompatible constituents: pyropheophorbide-a (PPa, water-insoluble photosensitizer), polycaprolactone (PCL, hydrophobic/biodegradable polymer), and Pluronic F-68 (clinically approved polymeric surfactant). Repeated microemulsification/evaporation method resulted in a fine colloidal dispersion of PPaN-20 in water, where the particulate PCL matrix containing well-dispersed PPa molecules inside was stabilized by the Pluronic corona. Compared to a control sample of large-sized nanoparticles (PPaN-200) prepared by a conventional solvent displacement method, PPaN-20 revealed optimal singlet oxygen generation and efficient cellular uptake by virtue of the suitably engineered size and constitution, leading to high in vitro phototoxicity against cancer cells. Upon administration to tumor-bearing mice by peritumoral route, PPaN-20 showed efficient tumor accumulation by the enhanced cell/tissue penetration evidenced by in vivo near-infrared fluorescence imaging. The in vivo PDT treatment with peritumorally administrated PPaN-20 showed significantly enhanced suppression of tumor growth compared to the control group, demonstrating great potential as a biocompatible photosensitizing agent for locoregional PDT treatment of cancer.
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Affiliation(s)
- Keunsoo Jeong
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea; Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Gwanak-gu, Seoul 151-744, South Korea
| | - Solji Park
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea; Department of Chemistry, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, South Korea
| | - Yong-Deok Lee
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea
| | - Chi Soo Kang
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea
| | - Hyun Jun Kim
- Department of Chemistry, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, South Korea
| | - Hyeonjong Park
- Department of Chemistry, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, South Korea
| | - Ick Chan Kwon
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea
| | - Jungahn Kim
- Department of Chemistry, Kyung Hee University, Dongdaemoon-gu, Seoul 130-701, South Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University, Gwanak-gu, Seoul 151-744, South Korea
| | - Sehoon Kim
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1Hawolgok-dong, Seongbuk-gu, Seoul 136-791, South Korea.
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Oh JY, Kim YS, Jung Y, Yang SJ, Park CR. Preparation and Exceptional Mechanical Properties of Bone-Mimicking Size-Tuned Graphene Oxide@Carbon Nanotube Hybrid Paper. ACS Nano 2016; 10:2184-2192. [PMID: 26795353 DOI: 10.1021/acsnano.5b06719] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The self-assembled nanostructures of carbon nanomaterials possess a damage-tolerable architecture crucial for the inherent mechanical properties at both micro- and macroscopic levels. Bone, or "natural composite," has been known to have superior energy dissipation and fracture resistance abilities due to its unique load-bearing hybrid structure. However, few approaches have emulated the desirable structure using carbon nanomaterials. In this paper, we present an approach in fabricating a hybrid composite paper based on graphene oxide (GO) and carbon nanotube (CNT) that mimicks the natural bone structure. The size-tuning strategy enables smaller GO sheets to have more cross-linking reactions with CNTs and be homogeneously incorporated into CNT-assembled paper, which is advantageous for effective stress transfer. The resultant hybrid composite film has enhanced mechanical strength, modulus, toughness, and even electrical conductivity compared to previously reported CNT-GO based composites. We further demonstrate the usefulness of the size-tuned GOs as the "stress transfer medium" by performing in situ Raman spectroscopy during the tensile test.
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Affiliation(s)
- Jun Young Oh
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , Seoul 151-744, Korea
| | - Yern Seung Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , Seoul 151-744, Korea
| | - Yeonsu Jung
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , Seoul 151-744, Korea
| | - Seung Jae Yang
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , Seoul 151-744, Korea
- Advanced Nanohybrids Laboratory, Department of Applied Organic Materials Engineering, Inha University , Incheon 402-751, Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , Seoul 151-744, Korea
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Kim JH, Jeong YC, Park KT, Oh JY, Cho YS, Lee JY, Yang SJ, Park CR. Easy preparation of partially-opened carbon nanotubes by simple air oxidation for high performance Li–S batteries. RSC Adv 2016. [DOI: 10.1039/c6ra22039h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Partially opened carbon nanotubes provide increased surface area and accessible inner pores with oxygen groups leading to high performance sulfur batteries.
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Affiliation(s)
- Jae Ho Kim
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
| | - Yo Chan Jeong
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
| | - Kyung Tae Park
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
| | - Jun Young Oh
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
| | - Young Shik Cho
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
| | - Jong Yoon Lee
- Department of Applied Organic Materials Engineering
- Inha University
- Incheon 402-751
- Republic of Korea
| | - Seung Jae Yang
- Department of Applied Organic Materials Engineering
- Inha University
- Incheon 402-751
- Republic of Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory
- Research Institute of Advanced Materials
- Department of Materials Science and Engineering
- Seoul National University
- Seoul 151-744
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25
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Kim T, Yang SJ, Sung SJ, Kim YS, Chang MS, Jung H, Park CR. Highly reproducible thermocontrolled electrospun fiber based organic photovoltaic devices. ACS Appl Mater Interfaces 2015; 7:4481-4487. [PMID: 25650717 DOI: 10.1021/am508250q] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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
In this work, we examined the reasons underlying the humidity-induced morphological changes of electrospun fibers and suggest a method of controlling the electrospun fiber morphology under high humidity conditions. We fabricated OPV devices composed of electrospun fibers, and the performance of the OPV devices depends significantly on the fiber morphology. The evaporation rate of a solvent at various relative humidity was measured to investigate the effects of the relative humidity during electrospinning process. The beaded nanofiber morphology of electrospun fibers was originated due to slow solvent evaporation rate under high humidity conditions. To increase the evaporation rate under high humidity conditions, warm air was applied to the electrospinning system. The beads that would have formed on the electrospun fibers were completely avoided, and the power conversion efficiencies of OPV devices fabricated under high humidity conditions could be restored. These results highlight the simplicity and effectiveness of the proposed method for improving the reproducibility of electrospun nanofibers and performances of devices consisting of the electrospun nanofibers, regardless of the relative humidity.
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Affiliation(s)
- Taehoon Kim
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
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26
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Oh JY, Yang SJ, Park JY, Kim T, Lee K, Kim YS, Han HN, Park CR. Easy preparation of self-assembled high-density buckypaper with enhanced mechanical properties. Nano Lett 2015; 15:190-197. [PMID: 25495117 DOI: 10.1021/nl5033588] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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
A controlled assembly and alignment of carbon nanotubes (CNTs) in a high-packing density with a scalable way remains challenging. This paper focuses on the preparation of self-assembled and well-aligned CNTs with a densely packed nanostructure in the form of buckypaper via a simple filtration method. The CNT suspension concentration is strongly reflected in the alignment and assembly behavior of CNT buckypaper. We further demonstrated that the horizontally aligned CNT domain gradually increases in size when increasing the deposited CNT quantity. The resultant aligned buckypaper exhibited notably enhanced packing density, strength, modulus, and hardness compared to previously reported buckypapers.
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Affiliation(s)
- Jun Young Oh
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, and Department of Materials Science and Engineering, Seoul National University , Seoul 151-744, Korea
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27
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Park S, Jeong K, Lee E, Lee JH, Yhee JY, Singh A, Koh J, Lee S, Kim K, Chan Kwon I, Park CR, Kim J, Kim S. Amphiphilized poly(ethyleneimine) nanoparticles: a versatile multi-cargo carrier with enhanced tumor-homing efficiency and biocompatibility. J Mater Chem B 2014; 3:198-206. [PMID: 32261940 DOI: 10.1039/c4tb01255k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Current theranostic approaches in cancer therapy demand delivery systems that can carry multiple drugs or imaging agents in a single nanoplatform with uniform biodistribution and improved target specificity. In this study, we have developed amphiphilized poly(ethyleneimine) nanoparticles (aPEI NPs) as a versatile multi-cargo delivery platform. The aPEI NPs were engineered to have the loading capacity for both hydrophobic molecules and negatively charged hydrophilic colloidal cargos through amphiphilic modification, i.e., octadecylation and subsequent PEGylation of poly(ethyleneimine). In the aqueous phase, the resulting aPEIs underwent amphiphilic self-assembly into spherical nanoparticles whose structure is constituted of the hydrophobic core with the positively charged surface and the hydrophilic neutral corona. The high degree of PEGylation resulted in the tiny colloidal size (<15 nm in diameter) and rendered the outmost surface coated with an antifouling corona which minimizes general shortcomings of poly(ethyleneimine)-based nanocarriers (e.g., cytotoxicity and liver filtration) while keeping its advantage (loading capability for negatively charged drugs). The unique nanostructure of aPEI NPs allowed for facile loading of hydrophobic model drugs (rubrene and IR780) in the core as well as negatively charged colloids (Pdots, proteins and DNA) on the inner surface via the hydrophobic and electrostatic interactions, respectively. Fluorescence imaging experiments demonstrated that the highly PEGylated aPEI-25 NPs showed prolonged blood circulation with minimal liver filtration and efficient delivery of the loaded cargos to the tumor. These combined merits, along with negligible toxicity profiles both in vitro and in vivo, validate the potential of aPEI-25 NPs as versatile nanocarriers for multi-cargo delivery.
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Affiliation(s)
- Solji Park
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Korea.
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28
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Hong SH, Bang EN, Lim ST, Lee JY, Yang SJ, Litnovsky A, Hellwig M, Matveev D, Komm M, van den Berg M, Lho T, Park CR, Kim GH. Preliminary test results on tungsten tile with castellation structures in KSTAR. Fusion Engineering and Design 2014. [DOI: 10.1016/j.fusengdes.2014.01.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Im JH, Kang E, Yang SJ, Park HJ, Kim J, Park CR. Simple Preparation of Anatase Titanium Dioxide Nanoparticles by Heating Titanium-Organic Frameworks. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.8.2477] [Citation(s) in RCA: 8] [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] [Indexed: 11/20/2022]
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30
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Lee K, Park CR. Effects of chirality and diameter of single-walled carbon nanotubes on their structural stability and solubility parameters. RSC Adv 2014. [DOI: 10.1039/c4ra05212a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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31
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Lim HJ, Lee K, Cho YS, Kim YS, Kim T, Park CR. Experimental consideration of the Hansen solubility parameters of as-produced multi-walled carbon nanotubes by inverse gas chromatography. Phys Chem Chem Phys 2014; 16:17466-72. [DOI: 10.1039/c4cp02319f] [Citation(s) in RCA: 24] [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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32
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Kim T, Yang SJ, Kim SK, Choi HS, Park CR. Preparation of PCDTBT nanofibers with a diameter of 20 nm and their application to air-processed organic solar cells. Nanoscale 2014; 6:2847-2854. [PMID: 24469012 DOI: 10.1039/c3nr05538h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A strategy for fabricating organic photovoltaic (OPV) devices based on PCDTBT nanofibers and PC70BM is described. Electrospinning techniques are used to prepare PCDTBT nanofibers and OPV devices in ambient air. The diameters of the PCDTBT nanofibers are approximately twice the exciton diffusion length, 20 nm. The active layer exhibits 100% photoluminescence quenching due to the small nanofiber diameter, indicating that the excitons are efficiently dissociated. The electrospun PCDTBT nanofibers absorb more photons at longer wavelengths, leading to improved photon harvesting. OPV devices composed of PCDTBT nanofibers show a high short circuit current of 11.54 mA cm(-2) and a high power conversion efficiency of 5.82%. The increase in the short circuit current is attributed to enhanced photon harvesting and charge transport. This method may be applied to the fabrication, in ambient air, of large-area active layers composed of other new conjugated polymers to yield high-performance OPV devices.
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Affiliation(s)
- Taehoon Kim
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory (GRL), Research Institute of Advanced Materials (RIAM), and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea.
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33
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Im JH, Ko N, Yang SJ, Park HJ, Kim J, Park CR. Enhanced water stability and CO2 gas sorption properties of a methyl functionalized titanium metal–organic framework. NEW J CHEM 2014. [DOI: 10.1039/c4nj00138a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A methyl-modified metal–organic framework (m-TiBDC) exhibiting significantly enhanced hydrostability than unmodified TiBDC maintains its framework structure and also CO2 gas adsorption capacity even after its immersion in water for 2 hours.
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Affiliation(s)
- Ji Hyuk Im
- Carbon Nanomaterials Design Laboratory
- Global Research Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
| | - Nakeun Ko
- Institute for Integrative Basic Sciences and Department of Chemistry
- Soongsil University
- Seoul 156-743, Korea
| | - Seung Jae Yang
- Carbon Nanomaterials Design Laboratory
- Global Research Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
| | - Hye Jeong Park
- Institute for Integrative Basic Sciences and Department of Chemistry
- Soongsil University
- Seoul 156-743, Korea
| | - Jaheon Kim
- Institute for Integrative Basic Sciences and Department of Chemistry
- Soongsil University
- Seoul 156-743, Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design Laboratory
- Global Research Laboratory
- Research Institute of Advanced Materials
- and Department of Materials Science and Engineering
- Seoul National University
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34
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Choi HS, Oh JY, Park CR. One step synthesis of sulfur–carbon nanosheet hybrids via a solid solvothermal reaction for lithium sulfur batteries. RSC Adv 2014. [DOI: 10.1039/c3ra45187a] [Citation(s) in RCA: 8] [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] [Indexed: 11/21/2022] Open
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35
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Jeong K, Park S, Lee YD, Lim CK, Kim J, Chung BH, Kwon IC, Park CR, Kim S. Conjugated polymer/photochromophore binary nanococktails: bistable photoswitching of near-infrared fluorescence for in vivo imaging. Adv Mater 2013; 25:5574-5580. [PMID: 23847108 DOI: 10.1002/adma.201301901] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 05/31/2013] [Indexed: 06/02/2023]
Abstract
Nanoscopic dense integration between solid-state emission and photochromism provides nanoprobes capable of photoswitching of bright NIR fluorescence with high on/off contrast, bistability and improved signal identification, being suitable for imaging applications in autofluorescence-rich in vivo environments.
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Affiliation(s)
- Keunsoo Jeong
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul, 136-791, Korea; Carbon Nanomaterials Design Laboratory, Global Research Laboratory and Department of Materials Science and Engineering, Seoul National University, Gwanak-gu, Seoul, 151-744, Korea
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36
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Ito M, Nishihara H, Yamamoto K, Itoi H, Tanaka H, Maki A, Miyahara MT, Yang SJ, Park CR, Kyotani T. Back Cover: Reversible Pore Size Control of Elastic Microporous Material by Mechanical Force (Chem. Eur. J. 39/2013). Chemistry 2013. [DOI: 10.1002/chem.201390153] [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: 11/08/2022]
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37
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Ito M, Nishihara H, Yamamoto K, Itoi H, Tanaka H, Maki A, Miyahara MT, Yang SJ, Park CR, Kyotani T. Reversible Pore Size Control of Elastic Microporous Material by Mechanical Force. Chemistry 2013; 19:13009-16. [DOI: 10.1002/chem.201301806] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Indexed: 11/11/2022]
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38
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Lim CK, Heo J, Shin S, Jeong K, Seo YH, Jang WD, Park CR, Park SY, Kim S, Kwon IC. Nanophotosensitizers toward advanced photodynamic therapy of Cancer. Cancer Lett 2013; 334:176-87. [DOI: 10.1016/j.canlet.2012.09.012] [Citation(s) in RCA: 216] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 09/14/2012] [Accepted: 09/15/2012] [Indexed: 02/07/2023]
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39
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Jeong K, Lee YD, Park S, Lee E, Lim CK, Lee KE, Jeon H, Kim J, Chan Kwon I, Park CR, Kim S. Poly(oxyethylene sugaramide)s: unprecedented multihydroxyl building blocks for tumor-homing nanoassembly. J Mater Chem B 2013; 1:3437-3442. [PMID: 32260933 DOI: 10.1039/c3tb20387e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrogen bonding is a major intermolecular interaction for self-assembly occurring in nature. Here we report novel polymeric carbohydrates, i.e., poly(oxyethylene galactaramide)s (PEGAs), as biomimetic building blocks to construct hydrogen bond-mediated self-assembled nanoparticles that are useful for biomedical in vivo applications. PEGAs were conceptually designed as a biocompatible hybrid between polysaccharide and poly(ethylene glycol) (PEG) to attain multivalent hydrogen bonding as well as fully hydrophilic, non-ionic and antifouling characteristics. It was revealed that PEGAs are capable of homospecies hydrogen bonding in water and constructing multi-chain assembled nanoparticles whose structural integrity is highly stable with varying concentration, temperature and pH. Using near-infrared fluorescence imaging we demonstrate facile blood circulation and efficient tumor accumulation of the self-assembled PEGA nanoparticles that were intravenously injected into mice. These in vivo behaviors elucidate the combined merits of our design strategy, i.e., biocompatible chemical constitution capable of multivalent hydrogen bonding, antifouling properties, minimal cell interaction and mesoscopic colloidal self-assembly, as well as size-motivated tumor targeting.
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Affiliation(s)
- Keunsoo Jeong
- Center for Theragnosis, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Korea.
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40
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Yang SJ, Nam S, Kim T, Im JH, Jung H, Kang JH, Wi S, Park B, Park CR. Preparation and Exceptional Lithium Anodic Performance of Porous Carbon-Coated ZnO Quantum Dots Derived from a Metal–Organic Framework. J Am Chem Soc 2013; 135:7394-7. [DOI: 10.1021/ja311550t] [Citation(s) in RCA: 436] [Impact Index Per Article: 39.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Seung Jae Yang
- Carbon Nanomaterials Design
Laboratory, Global Research Laboratory, Research Institute of Advanced
Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Seunghoon Nam
- WCU Hybrid Materials Program,
Department of Materials Science and Engineering, Research Institute
of Advanced Materials, Seoul National University, Seoul 151-744, Korea
| | - Taehoon Kim
- Carbon Nanomaterials Design
Laboratory, Global Research Laboratory, Research Institute of Advanced
Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Ji Hyuk Im
- Carbon Nanomaterials Design
Laboratory, Global Research Laboratory, Research Institute of Advanced
Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Haesol Jung
- Carbon Nanomaterials Design
Laboratory, Global Research Laboratory, Research Institute of Advanced
Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Jong Hun Kang
- Carbon Nanomaterials Design
Laboratory, Global Research Laboratory, Research Institute of Advanced
Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
| | - Sungun Wi
- WCU Hybrid Materials Program,
Department of Materials Science and Engineering, Research Institute
of Advanced Materials, Seoul National University, Seoul 151-744, Korea
| | - Byungwoo Park
- WCU Hybrid Materials Program,
Department of Materials Science and Engineering, Research Institute
of Advanced Materials, Seoul National University, Seoul 151-744, Korea
| | - Chong Rae Park
- Carbon Nanomaterials Design
Laboratory, Global Research Laboratory, Research Institute of Advanced
Materials, and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
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Hosoda T, Gido SP, Mays JW, Huang T, Park CR, Yamada T. Effect of solvents and thermal annealing on the morphology development of a novel block copolymer ionomer: a case study of sulfonated polystyrene-block-fluorinated polyisoprene; J. Polym. Eng. 2013, 33, 49–59. Journal of Polymer Engineering 2013. [DOI: 10.1515/polyeng-2013-0059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
No abstract available.
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Lee K, Lim HJ, Yang SJ, Kim YS, Park CR. Determination of solubility parameters of single-walled and double-walled carbon nanotubes using a finite-length model. RSC Adv 2013. [DOI: 10.1039/c3ra40382c] [Citation(s) in RCA: 26] [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] Open
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Yang SJ, Park CR. Preparation of highly moisture-resistant black-colored metal organic frameworks. Adv Mater 2012; 24:4010-4013. [PMID: 22700355 DOI: 10.1002/adma.201200790] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 04/26/2012] [Indexed: 06/01/2023]
Abstract
A straightforward method for significantly improving the moisture resistance of MOFs is described. In the proposed method, MOFs are subjected to thermal treatment, thus inducing the formation of an amorphous carbon coating on the MOF surfaces that prevents hydrolysis. This approach should open up new practical applications for MOFs in areas hitherto unexplored due to concerns regarding moisture sensitivity.
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Affiliation(s)
- Seung Jae Yang
- Carbon Nanomaterials Design Laboratory, Research Institute of Advanced Materials, Seoul National University, Republic of Korea
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Yang SJ, Choe JM, Jin YG, Lim ST, Lee K, Kim YS, Choi S, Park SJ, Hwang Y, Kim GH, Park CR. Influence of H+ ion irradiation on the surface and microstructural changes of a nuclear graphite. Fusion Engineering and Design 2012. [DOI: 10.1016/j.fusengdes.2012.02.065] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Im JH, Yang SJ, Yun CH, Park CR. Simple fabrication of carbon/TiO2 composite nanotubes showing dual functions with adsorption and photocatalytic decomposition of Rhodamine B. Nanotechnology 2012; 23:035604. [PMID: 22172680 DOI: 10.1088/0957-4484/23/3/035604] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Carbon/TiO2 composite nanotubes were fabricated via a very simple electrospinning process and their dual functionalities of adsorptivity and photocatalytic activity were evaluated using Rhodamine B (RhB) as a model organic pollutant. A poly(vinyl alcohol) (PVA) aqueous solution was directly electrospun into a coagulation bath containing titanium (IV) tetraisopropoxide (TTIP) solution so that PVA-core/TiO2-shell composite nanofibers were formed through the in situ sol-gel reaction of TTIP. The carbon/TiO2 composite nanotubes were then fabricated by heat treatment of composite nanofibers under nitrogen atmosphere. By using several characterization methods, we confirmed that the resultant nanotubes consisted of anatase TiO2 nanocrystallites embedded in a carbonaceous matrix. The prepared nanotubes exhibited fast adsorption of RhB with high capacity compared with a commercial porous carbon, and they also showed the photocatalytic decomposition activity for the dye molecules under UV irradiation comparable to the degradation by P-25 and ST-01 (commercial TiO2). Finally, the carbon/TiO2 composite nanotubes exhibited several cycle performances of adsorption-photodegradation for RhB. This indicates that the composite nanotubes can adsorb and photodecompose organic pollutants repeatedly without additional activating processes.
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Affiliation(s)
- Ji Hyuk Im
- Carbon Nanomaterials Design Laboratory, Global Research Laboratory, Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Korea
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Choi HS, Im JH, Kim T, Park JH, Park CR. Advanced energy storage device: a hybrid BatCap system consisting of battery–supercapacitor hybrid electrodes based on Li4Ti5O12–activated-carbon hybrid nanotubes. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32841k] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Choi HS, Kim T, Im JH, Park CR. Preparation and electrochemical performance of hyper-networked Li4Ti5O12/carbon hybrid nanofiber sheets for a battery-supercapacitor hybrid system. Nanotechnology 2011; 22:405402. [PMID: 21911931 DOI: 10.1088/0957-4484/22/40/405402] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Hyper-networked Li(4)Ti(5)O(12)/carbon hybrid nanofiber sheets that contain both a faradaically rechargeable battery-type component, namely Li(4)Ti(5)O(12), and a non-faradaically rechargeable supercapacitor-type component, namely N-enriched carbon, are prepared by electrospinning and their dual function as a negative electrode of lithium-ion batteries (LIBs) and a capacitor is tested for a new class of hybrid energy storage (denoted BatCap). An aqueous solution composed of polyvinylpyrrolidone, lithium hydroxide, titanium(IV) bis(ammonium-lactato)dihydroxide and ammonium persulfate is electrospun to obtain hyper-networked nanofiber sheets. Next, the sheets are exposed to pyrrole monomer vapor to prepare the polypyrrole-coated nanofiber sheets (PPy-HNS). The hyper-networked Li(4)Ti(5)O(12)/N-enriched carbon hybrid nanofiber sheets (LTO/C-HNS) are then obtained by a stepwise heat treatment of the PPy-HNS. The LTO/C-HNS deliver a specific capacity of 135 mAh g(-1) at 4000 mA g(-1) as a negative electrode for LIBs. In addition, potentiodynamic experiments are performed using a full cell with activated carbon (AC) as the positive electrode and LTO/C-HNS as the negative electrode to estimate the capacitance properties. This new asymmetric electrode system exhibits a high energy density of 91 W kg(-1) and 22 W kg(-1) at power densities of 50 W kg(-1) and 4000 W kg(-1), respectively, which are superior to the values observed for the AC [symbol: see text] AC symmetric electrode system.
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Affiliation(s)
- Hong Soo Choi
- Carbon Nanomaterials Design Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
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Yang SJ, Im JH, Kim T, Lee K, Park CR. MOF-derived ZnO and ZnO@C composites with high photocatalytic activity and adsorption capacity. J Hazard Mater 2011; 186:376-382. [PMID: 21146926 DOI: 10.1016/j.jhazmat.2010.11.019] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2010] [Revised: 11/03/2010] [Accepted: 11/03/2010] [Indexed: 05/30/2023]
Abstract
Nanostructured ZnO materials have unique and highly attractive properties and have inspired interest in their research and development. This paper presents a facile method for the preparation of novel ZnO-based nanostructured architectures using a metal organic framework (MOF) as a precursor. In this approach, ZnO nanoparticles and ZnO@C hybrid composites were produced under several heating and atmospheric (air or nitrogen) conditions. The resultant ZnO nanoparticles formed hierarchical aggregates with a three-dimensional cubic morphology, whereas ZnO@C hybrid composites consisted of faceted ZnO crystals embedded within a highly porous carbonaceous species, as determined by several characterization methods. The newly synthesized nanomaterials showed relatively high photocatalytic decomposition activity and significantly enhanced adsorption capacities for organic pollutants.
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Affiliation(s)
- Seung Jae Yang
- Research Institute of Advanced Materials, Seoul National University, Seoul, South Korea
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Kim T, Im JH, Choi HS, Yang SJ, Kim SW, Park CR. Preparation and photoluminescence (PL) performance of a nanoweb of P3HT nanofibers with diameters below 100 nm. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10396b] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [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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Choi HS, Lee JG, Lee HY, Kim SW, Park CR. Effects of surrounding confinements of Si nanoparticles on Si-based anode performance for lithium ion batteries. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.09.101] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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