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131.
Tae Hoon Lee Aydin Ozcan Inho Park Dong Fan Jun Kyu Jang Paulo G. M. Mileo Seung Yeon Yoo Ji Soo Roh Jun Hyeok Kang Byung Kwan Lee Young Hoon Cho Rocio Semino Hyo Won Kim Guillaume Maurin Ho Bum Park 《Advanced functional materials》2021,31(38):2103973
Incorporation of defects in metal–organic frameworks (MOFs) offers new opportunities for manipulating their microporosity and functionalities. The so-called “defect engineering” has great potential to tailor the mass transport properties in MOF/polymer mixed matrix membranes (MMMs) for challenging separation applications, for example, CO2 capture. This study first investigates the impact of MOF defects on the membrane properties of the resultant MOF/polymer MMMs for CO2 separation. Highly porous defect-engineered UiO-66 nanoparticles are successfully synthesized and incorporated into a CO2-philic crosslinked poly(ethylene glycol) diacrylate (PEGDA) matrix. A thorough joint experimental/simulation characterization reveals that defect-engineered UiO-66/PEGDA MMMs exhibit nearly identical filler–matrix interfacial properties regardless of the defect concentrations of their parental UiO-66 filler. In addition, non-equilibrium molecular dynamics simulations in tandem with gas transport studies disclose that the defects in MOFs provide the MMMs with ultrafast transport pathways mainly governed by diffusivity selectivity. Ultimately, MMMs containing the most defective UiO-66 show the most enhanced CO2/N2 separation performance—CO2 permeability = 470 Barrer (four times higher than pure PEGDA) and maintains CO2/N2 selectivity = 41—which overcomes the trade-off limitation in pure polymers. The results emphasize that defect engineering in MOFs would mark a new milestone for the future development of optimized MMMs. 相似文献
132.
133.
Peter Schelkens Touradj Ebrahimi Antonin Gilles Patrick Gioia Kwan‐Jung Oh Fernando Pereira Cristian Perra Antonio M. G. Pinheiro 《ETRI Journal》2019,41(1):93-108
Guaranteeing interoperability between devices and applications is the core role of standards organizations. Since its first JPEG standard in 1992, the Joint Photographic Experts Group (JPEG) has published several image coding standards that have been successful in a plethora of imaging markets. Recently, these markets have become subject to potentially disruptive innovations owing to the rise of new imaging modalities such as light fields, point clouds, and holography. These so‐called plenoptic modalities hold the promise of facilitating a more efficient and complete representation of 3D scenes when compared to classic 2D modalities. However, due to the heterogeneity of plenoptic products that will hit the market, serious interoperability concerns have arisen. In this paper, we particularly focus on the holographic modality and outline how the JPEG committee has addressed these tremendous challenges. We discuss the main use cases and provide a preliminary list of requirements. In addition, based on the discussion of real‐valued and complex data representations, we elaborate on potential coding technologies that range from approaches utilizing classical 2D coding technologies to holographic content‐aware coding solutions. Finally, we address the problem of visual quality assessment of holographic data covering both visual quality metrics and subjective assessment methodologies. 相似文献
134.
Lin Yang Chak‐Shing Kwan Lianglin Zhang Xinghua Li Yu Han Ken Cham‐Fai Leung Yonggang Yang Zhifeng Huang 《Advanced functional materials》2019,29(8)
Enantiodifferentiation is of fundamental importance in chiral chemistry and substantially requires high optical activity (OA) of enantiomers; but the enantiomeric OA is typically weak due to subwavelength molecular dimension, leading to a lack of sensitive enantiodifferentiation. A new approach is devised to evidently amplify the enantiomeric OA by anchoring axially chiral molecules containing the binaphthyl chromophore on silver chiral nanoparticles (AgCNPs) with a sub‐5 nm helical pitch (P). Compared to the OA of dissolved enantiomers, that of (R)‐ and (S)‐ enantiomers can be enantioselectively amplified on right‐handed and left‐handed AgCNPs, respectively, in as high as one order of magnitude. The enantioselective amplification is probably ascribed to the enantiospecific adsorption‐induced change in the dihedral angle of the binaphthyl chromophore, resulting from chirality transfer from chiral footprints of the AgCNPs to the binaphthyl chromophore through the Ag–S bicontacts. The enantioselective amplification tends not to occur as long as P > 5 nm or on achiral Ag nanoparticles, due to a lack of the chirality transfer. This work imposes the significant application of enantiodifferentiation, which is on practical demand for producing single‐enantiomer pharmaceutics and pesticides with no fatal adverse effect, on the emerging chiral metamaterials composed of metallic CNPs. 相似文献
135.
Van‐Tien Bui Qitao Zhou Jong‐Nam Kim Jung‐Hwan Oh Kwan‐Woo Han Ho‐Suk Choi Sang‐Woo Kim Il‐Kwon Oh 《Advanced functional materials》2019,29(28)
Inspired by treefrog's toe pads that show superior frictional properties, herein, an industrially compatible approach is reported to make an efficient dielectric tribosurface design using customizable nonclose‐packed microbead arrays, mimicking the friction pads of treefrogs, in order to significantly enhance electrification performance and reliability of triboelectric nanogenerator (TENG). The approach involves using an engineering polymer to prepare a highly ordered large‐area concave film, and subsequently the molding of a convex patterned triboreplica in which the concave film is exploited as a reusable master mold. A nature‐inspired TENG based on the patterned polydimethylsiloxane (PDMS) paired with flat aluminum (Al) can generate a relatively high power density of 8.1 W m?2 even if a very small force of ≈6.5 N is applied. Moreover, the convex patterned PDMS‐based TENG possesses exceptional durability and reliability over 25 000 cycles of contact–separation. Considering the significant improvements in power generation of TENG; particularly at very small force, together with cost‐effectiveness and possibility of mass production, the present methodology may pave the way for large‐scale blue energy harvesting and commercialization of TENGs for many practical applications. 相似文献
136.
M. Wei X. Guo J. Huang H. Xie H. Zong R. Kwan F. L. Wang J. Qin 《Computer Graphics Forum》2019,38(7):591-605
137.
Dong Wook Lee Jue‐Hyuk Jang Injoon Jang Yun Sik Kang Seguen Jang Kwan Young Lee Jong Hyun Jang Hyung‐Juhn Kim Sung Jong Yoo 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(36)
Recently, nonnoble‐metal catalysts such as a metal coordinated to nitrogen doped in a carbon matrix have been reported to exhibit superior oxygen reduction reaction (ORR) activity in alkaline media. In this work, Co2P nanoparticles supported on heteroatom‐doped carbon catalysts (NBSCP) are developed with an eco‐friendly synthesis method using bean sprouts. NBSCP can be easily synthesized through metal precursor absorption and carbonization at a high temperature. It shows a very large specific surface area with various dopants such as nitrogen, phosphorus, and sulfur derived from small organic molecules. The catalyst can exhibit activity in various electrochemical reactions. In particular, excellent performance is noted for the ORR. Compared to the commercial Pt/C, NBSCP exhibits a lower onset potential, higher current density, and superior durability. This excellent ORR activity and durability is attributable to the synergistic effect between Co2P nanoparticles and nitrogen‐doped carbon. In addition, superior performance is noted on applying NBSCP to a practical anion exchange membrane fuel cell system. Through this work, the possibility of applying an easily obtained bio‐derived material to energy conversion and storage systems is demonstrated. 相似文献
138.
139.
Ji Hoon Seo Jung Sun Park Suk Jae Lee Bo Min Seo Kum Hee Lee Jung Keun Park Seung Soo Yoon Young Kwan Kim 《Journal of Mechanical Science and Technology》2011,25(1):17-19
The authors demonstrated phosphorescent white organic light-emitting diodes (PHWOLED) with mixed electron transporting layers
(M-ETL) using 4,7-diphenyl-1,10-phenanthroline (BPhen)/4,4′-bis (carbazol-9-yl)biphenyl (CBP). The M-ETL PHWOLED exhibited
the optimum balance of holes and electrons, owing to the low electron mobility of the CBP M-ETL. The optimized PHWOLED showed
a peak current efficiency of 16.85 cd/A and a peak external quantum efficiency of 7.32%. 相似文献
140.
Dinh To Xuan Luan Nguyen Phi Ahn Kyoung Kwan 《Journal of Mechanical Science and Technology》2018,32(12):5875-5888
Journal of Mechanical Science and Technology - This paper focuses on the application of a novel inverse nonlinear autoregressive with exogenous input (NARX) structure and a fuzzy inference system... 相似文献