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RISS 인기검색어
- 검색키워드
- 저자 : He Zhengyu (검색결과 4 건)
- 무료
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Atomic structure and dynamics of metal dopant pairs in graphene.
He, Zhengyu,He, Kuang,Robertson, Alex W,Kirkland, Angus I,Kim, Dongwook,Ihm, Jisoon,Yoon, Euijoon,Lee, Gun-Do,Warner, Jamie H American Chemical Society 2014 NANO LETTERS Vol.14 No.7
<P>We present an atomic resolution structural study of covalently bonded dopant pairs in the lattice of monolayer graphene. Two iron (Fe) metal atoms that are covalently bonded within the graphene lattice are observed and their interaction with each other is investigated. The two metal atom dopants can form small paired clusters of varied geometry within graphene vacancy defects. The two Fe atoms are created within a 10 nm diameter predefined location in graphene by manipulating a focused electron beam (80 kV) on the surface of graphene containing an intentionally deposited Fe precursor reservoir. Aberration-corrected transmission electron microscopy at 80 kV has been used to investigate the atomic structure and real time dynamics of Fe dimers embedded in graphene vacancies. Four different stable structures have been observed; two variants of an Fe dimer in a graphene trivacancy, an Fe dimer embedded in two adjacent monovacancies and an Fe dimer trapped by a quadvacancy. According to spin-sensitive DFT calculations, these dimer structures all possess magnetic moments of either 2.00 or 4.00 μB. The dimer structures were found to evolve from an initial single Fe atom dopant trapped in a graphene vacancy.</P>
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Layer-Dependent Modulation of Tungsten Disulfide Photoluminescence by Lateral Electric Fields
He, Zhengyu,Sheng, Yuewen,Rong, Youmin,Lee, Gun-Do,Li, Ju,Warner, Jamie H. American Chemical Society 2015 ACS NANO Vol.9 No.3
<P>Large single-crystal domains of WS<SUB>2</SUB> are grown by chemical vapor deposition, and their photoluminescent properties under a lateral electric field are studied. We demonstrate that monolayer and bilayer WS<SUB>2</SUB> have opposite responses to lateral electric fields, with WS<SUB>2</SUB> photoluminescence (PL) substantially reduced in monolayer and increased in bilayers with increasing lateral electric field strength. Temperature-dependent PL measurements are also undertaken and show behavior distinctly different than that of the lateral electric field effects, ruling out heating as the cause of the PL changes. The PL variation in both monolayer and bilayer WS<SUB>2</SUB> is attributed to the transfer of photoexcited electrons from one conduction band extremum to another, modifying the resultant recombination pathways. This effect is observed in 2D transition metal dichalcogenides due to their large exciton binding energy and small energy difference between the two conduction band extrema.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-3/nn506594a/production/images/medium/nn-2014-06594a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn506594a'>ACS Electronic Supporting Info</A></P>
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Regulating surface-pore structure of PES UF membrane by addition of ‘‘active” nano-CaCO3
Mantong Gao,Shenghuan Wang,Yanhong Ji,Zhengyu Cui,Feng Yan,Mohammad Younas,Jianxin Li,Benqiao He 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
A small surface-pore ultrafiltration membrane with a high surface porosity was fabricated from a polyethersulfone (PES) dope solution containing a small quantity of CaCO3 nanoparticles (nano-CaCO3),which coagulated in dilute HCl solution. During membrane formation, CO2 nanobubbles were in-situ generatedto delay phase inversion, which ameliorated the membrane structure and performance becauseCO2 nanobubbles are amphiphobic to water and solvent. With increasing nano-CaCO3 content (from 0to 0.15%) in the dope solution, the surface porosity and the surface-pore density of the obtained PESUF membrane were markedly increased from 1.76 to 6.50% and from 8.31 1014 to 5.08 1015 m2,respectively. Nonetheless, the surface-pore size decreased from 13.35 to 8.29 nm, and so as the distribution. The optimal membrane exhibited a high pure water flux (698.2 Lm2h1) and a high rejection tobovine serum album (>99%) with a moderate anti-fouling ability. This work would be of great significancefor precision separation in biopharmaceutical, food processing, and other related applications.
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Tang Ri,Tang Ri,Xu Qiaoyi,Feng Jinhua,Zhou Yang,Xing Shunpeng,He Zhengyu,Gao Yuan 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Recent clinical research has revealed that mechanical ventilation (MV) can initiate pulmonary fibrosis and induce mechanical ventilation-induced pulmonary fibrosis (MVPF). However, the underlying mechanism remains largely uncharacterized. Based on a mouse model of MVPF and an alveolar epithelial cell cyclic strain model, the present study explores the possible mechanism of MVPF. Single-cell RNA-sequencing and EV RNA-sequencing analysis revealed that MV promoted apoptosis signal-regulating kinase 1 (ASK1)-mediated endoplasmic reticulum (ER) stress pathway activation and extracellular vesicle (EV) release from alveolar epithelial cells. Furthermore, the ASK1-ER stress pathway was shown to mediate mechanical stretch (MS)- or MV-induced EV release and lung fibroblast activation in vivo and in vitro. These processes were suppressed by ER stress inhibitors or by silencing ASK1 with ASK1- short hairpin RNA (shRNA). In addition, MVPF was suppressed by inhibiting ASK1 and ER stress in vivo. Therefore, the present study demonstrates that ASK1-ER stress pathway-mediated fibrotic-EV release from alveolar epithelial cells contributes to fibroblast activation and the initiation of pulmonary fibrosis during MV. The inhibited release of EVs targeting the ASK1-ER stress pathway might be a promising treatment strategy for MVPF.
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