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Light(Science & Applications) 2023年第12期12卷 2610-2623页

作者： Baekcheon Seong Woovin kim younghun kim Kyung-A Hyun Hyo-Il Jung Jong-Seok Lee Jeonghoon Yoo Chulmin Joo Department of Mechanical Engineering Yonsei UniversitySeoul 03722Republic of Korea The DABOM Inc Seoul 03722Republic of Korea School of Integrated Technology Yonsei UniversityIncheon 21983Republic of Korea

Several image-based biomedical diagnoses require high-resolution imaging capabilities at large spatial ***,conventional microscopes exhibit an inherent trade-off between depth-of-field(DoF)and spatial resolution,and thus require objects to be refocused at each lateral location,which is time ***,we present a computational imaging platform,termed E2E-BPF microscope,which enables large-area,high-resolution imaging of large-scale objects without serial *** method involves a physics-incorporated,deep-learned design of binary phase filter(BPF)and jointly optimized deconvolution neural network,which altogether produces high-resolution,high-contrast images over extended depth *** demonstrate the method through numerical simulations and experiments with fluorescently labeled beads,cells and tissue section,and present high-resolution imaging capability over a 15.5-fold larger DoF than the conventional *** method provides highly effective and scalable strategy for DoF-extended optical imaging system,and is expected to find numerous applications in rapid image-based diagnosis,optical vision,and metrology.

关键词： image diagnosis binary

Morphology-Controlled Synthesis of Zn_xCd_1-xS Solid Solutions: An Efficient Solar Light Active Photocatalyst for the Degradation of 2,4,6-Trichlorophenol

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Journal of Environmental Protection 2016年第11期7卷 1605-1617页

作者： Rengaraj Selvaraj Kezhen Qi Sathish Babu Soundra Pandian Mohammed A. Meetani Bushra Al Wahaibi Haider Al Lawati Salma M. Z. Al Kindy younghun kim Mika Sillanpää Department of Chemistry College of Science Sultan Qaboos University Muscat Sultanate of Oman Laboratory of Green Chemistry LUT Savo Sustainable Technology Lappeenranta University of Technology Mikkeli Finland Institute of Catalysis for Energy and Environment College of Chemistry and Chemical Engineering Shenyang Normal University Shenyang China CAARU College of Science Sultan Qaboos University Muscat Sultanate of Oman Department of Chemistry United Arab Emirates University Al Ain UAE Department of Chemical Engineering Kwangwoon University Seoul South Korea

ZnxCd1-xS solid solutions with controlled morphology have been successfully synthe-sized by a facile solution-phase method. The prepared samples were characterized by X-ray powder diffraction (XRD), UV-vis diffuse reflectance spectra, X-ray photoelec-tron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission elec-tron microscopy (TEM). The photocatalytic activity of ZnxCd1-xS was evaluated in the 2,4,6-trichlorophenol (TCP) degradation and mineralization in aqueous solution under direct solar light illumination. The experiment demonstrated that TCP was effectively degraded by more than 95% with 120 min. The results show that ZnS with Cd doping (ZnxCd1-xS) exhibits the much stronger visible light adsorption than that of pure ZnS, the light adsorption increasing as the Cd2+ doping amount. These results indicate that Cd doping into a ZnS crystal lattice can result in the shift of the valence band of ZnS to a positive direction. It may lead to its higher oxidative ability than pure ZnS, which is important for organic pollutant degradation under solar light irradiation. Further-more, the photocatalytic activity studies reveal that the prepared ZnxCd1-xS nanostructures exhibit an excellent photocatalytic performance, degrading rapidly the aqueous 2,4,6-trichlorophenol solution under solar light irradiation. These results sug-gest that ZnxCd1-xS nanostructure will be a promising candidate of photocatalyst working in solar light range.

关键词： Photocatalyst Nanostructures Solution Phase 2 4 6-Trichlorophenol Solar Light Photocatalytic Activity

腐植酸和硝酸银存在下银纳米粒子对细菌的吸收

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腐植酸 2013年第3期 31-36页

作者： Eunjoo Bae Hee-Jin Park Jaeyong Yoon younghun kim Kyunghee Choi Jongheop Yi 韩立新首尔国立大学化学与生物工程学院首尔151742 光云大学化学工程学系首尔139701 国家环境研究所仁川404708 中国腐植酸工业协会北京100120

银纳米粒子(AgNPs)是一种潜在的抗菌材料,会引起细胞膜的损伤,并能产生活性氧(ROS)。由此产生的细胞膜的结构性变化能够增加银离子和AgNPs在细胞中的渗透能力。为了进一步阐述这个问题,我们测试了这种纳米材料的体内和体外细胞毒性,并... 详细信息

银纳米粒子(AgNPs)是一种潜在的抗菌材料,会引起细胞膜的损伤,并能产生活性氧(ROS)。由此产生的细胞膜的结构性变化能够增加银离子和AgNPs在细胞中的渗透能力。为了进一步阐述这个问题,我们测试了这种纳米材料的体内和体外细胞毒性,并通过这种方法来量化和评估它们的纳米毒性。考虑到AgNPs在环境中的行为,毒性可能受到其物理化学性质(尺寸、附聚率、在腐植酸上的吸附性能)和毒性抑制性质的差异影响。我们通过附聚和吸附动力学研究了细胞吸收AgNPs的作用。试验发现,尺寸小于14nm的AgNPs的附聚和吸附高于尺寸为90nm和140nm的AgNPs的附聚和吸附。对于大小为90nm和140nm的AgNPs,吸附作用显著大于附聚作用。值得注意的是,在正规概念下,AgNPs越小越容易被吸收这一正常概念在非生物因素相互作用下可能是错误的。

关键词：银纳米粒子附聚吸附腐植酸盐度大肠杆菌

In situ thickness control of black phosphorus field-effect transistors via ozone treatment

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Nano Research 2016年第10期9卷 3056-3065页

作者： Suhyun kim younghun Jung Jong-Young Lee Gwan-Hyoung Lee Jihyun kim Department of Chemical and Biological Engineering Korea University Seou102841 Republic of Korea Department of Materials Science and Engineering Yonsei University Seou103722 Republic of Korea

A simple and reproducible method to control the thickness of black phosphorus flakes in real time using a UV/ozone treatment is demonstrated. Back-gated black phosphorus field-effect transistors （FETs） were fabricated using thick black phosphorus flakes obtained by thinning of black phosphorus, as oxygen radicals generated by UV irradiation formed phosphorus oxides on the surface. In order to monitor the thickness effect on the electrical properties, the fabricated FETs were loaded in the UV/ozone chamber, where both the optical （micro-Raman spectroscopy and optical microscopy） and electrical properties （current-voltage characteristics） were monitored in situ. We observed an intensity decrease of the Raman modes of black phosphorus while the field-effect mobility and on/off ratio increased by 48% and 6,800%, respectively. The instability in ambient air limits the investigation and implementation of ultra-thin black phosphorus. However, the method reported in this study allowed us to start with thick black phosphorous flakes, providing a reliable approach for optimizing the electrical performance of black phosphorus-based electronic devices. We believe that these results can motivate further studies using mono- and few-layer black phosphorus.

关键词： black phosphorus in situ thinning UV/ozone treatment

Highly ordered lead-free double perovskite halides by design

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Journal of Materiomics 2020年第4期6卷 651-660页

作者： Chang Won Ahn Jae Hun Jo Jong Chan kim Hamid Ullah Sangkyun Ryu younghun Hwang Jin San Choi Jongmin Lee Sanghan Lee Hyoungjeen Jeen Young-Han Shin Hu Young Jeong Ill Won kim Tae Heon kim Department of Physics and Energy Harvest-Storage Research Center(EHSRC) University of UlsanUlsan44610Republic of Korea UNIST Central Research Facilities(UCRF)&School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Multiscale Materials Modelling Laboratory Department of PhysicsUniversity of UlsanUlsan44610Republic of Korea Department of Physics Pusan National UniversityPusan46241Republic of Korea School of Electrical and Electronics Engineering Ulsan CollegeUlsan44610Republic of Korea School of Materials Science and Engineering Gwangju Institute of Science and TechnologyGwangju61005Republic of Korea

Lead-free double perovskite halides are emerging optoelectronic materials that are alternatives to leadbased perovskite ***,single-crystalline double perovskite halides were synthesized,and their intriguing functional properties were *** such pioneering works,lead-free double perovskite halides with better crystallinity are still in demand for applications to novel optoelectronic ***,we realized highly crystalline Cs2AgBiBr6 single crystals with a well-defined atomic ordering on the microscopic *** avoided the formation of Ag vacancies and the subsequent secondary Cs3Bi2Br9 by manipulating the initial chemical environments in hydrothermal *** suppression of Ag vacancies allows us to reduce the trap density in the as-grown crystals and to enhance the carrier mobility *** design strategy is applicable for fabricating other lead-free halide materials with high crystallinity.

关键词： Cs2AgBiBr6 Lead-free Double perovskite Single crystal

Effect of Polyacrylamide Application on Water and Nutrient Movements in Soils

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Journal of Agricultural Chemistry and Environment 2015年第3期4卷 76-81页

作者： Minyoung kim Inhong Song Minkyeong kim Seounghee kim Youngjin kim younghun Choi Myungchul Seo Department of Agricultural Engineering National Academy of Agricultural Science Rural Development Administration Jeonju Korea Research Institute for Agriculture and Life Sciences Seoul National University Seoul Korea Department of Agricultural Science National Academy of Agricultural Science Rural Development Administration Jeonju Korea Crop Production and Physiology Research Division National Institute of Crop Science Rural Development Administration Jeonju Korea

An understanding of nutrient movement in soil is important for developing management strategies to minimize nutrient leaching and surface movement, thus improving nutrient uptake by plants, maintaining a sustainable soil system, and even protecting groundwater quality. Polyacrylamide (PAM) is known as one of soil conditioner that functions to stabilize soil structure, increase infiltration, and reduce surface runoff. This study assesses the effects of PAM on the vertical movement of soil-water and major/minor nutrients (NO3-N, NH3-N, T-N, PO4-P, T-P, K, Ca, Mg, and Fe) in soils. Saturated hydraulic conductivity (Ksat) increases with increasing PAM concen- trations up to 10 mg·L-1 for sand and 20 mg·L-1 for a mixture of sand and clay. Decreases in the loss of soluble nutrients, particularly NH3-N, PO4-P and T-P, are observed as PAM concentrations increase. In contrast, PAM concentration has no effect on nitrate and minor nutrient levels. These results indicate that the application of PAM may be a viable method for protecting water bodies from excessive nutrients and improving nutrient availability for plants.

关键词： Polyacrylamide Water and Nutrient Movement Breakthrough Curve NaCl-Tracer Soil Column Major & Minot Nutrients

Osteoblasts dictate B lymphocyte commitment and differentiation

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Osteoblasts dictate B lymphocyte commitment and differentiat...