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Xiaoqin Chen,Qian Xiang,Chunyan Yong,Zu Liang Liu,Xiao Dong Xing 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.12
The bactericidal magnetic nanoparticles were prepared by modifying magnetic nanoparticles (MNPs) with N-halamine polymer coating and quaternary ammonium polymer coating via a two-step soap-free emulsion polymerization method. The success of the surface functionalization was confirmed by Fourier transform infrared (FT-IR), X-ray photoelectron spectra (XPS), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and zeta-potential measurement. The results of antibacterial tests showed that the functional MNPs exhibited excellent antibacterial efficiency against both Gram negative bacteria E. coli and Gram positive bacteria S. aureus. Meanwhile the nanoparticles could be removed easily from water by an external magnetic field after antibacterial tests.
Non-resonant 3D Elliptical Vibration Cutting Induced Submicron Grating Coloring
Jianzhong Chen,Mingming Lu,Jieqiong Lin,Jiakang Zhou,Xifeng Fu,Xiaoqin Zhou 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.4
Surface Submicron grating manufacturing has broad application prospects, which has also been the subject of intensive research and development by scholars with many eff orts. In this paper, a grating coloring manufacturing method is proposed based on three-dimensional elliptical vibration cutting and non-resonant piezoelectric actuator. Based on the mechanism of elliptical motion, an effective cutting depth model was established. Nonlinear interaction of machining parameters (overlap rate, nominal cutting speed, vibration frequency) on the geometry of the grating were analyzed and controllable modulation model of grating geometry was established. The geometrical dimensions of the grating were predicted and grooved experiments were performed on brass and aluminum surfaces. A set of angle-adjustable detection device was designed independently to check the diffraction quality of the grating. The quantitative experimental results show that grating distances of copper and aluminum rods are 752 nm and 684 nm, respectively. The average width of the aluminum rod overall grating is 764 nm, the accuracy error is 9.25%. In addition, aluminum rod gratings can diffractred light at non-specific angles, which is more effective at viewing angle of 70°. The experimental results are in agreement with the theory which have positive significance for expanding the functional surface.
Zhang Mengna,Chen Xiaoqin,Ruan Yongying,Jiang Shihong,Yang Jiaoxu,Jiang Minbao,Ruan Xiaonan,Li You 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
The Australian tortoise beetle Trachymela sloanei (Coleoptera: Chrysomelidae: Chrysomelinae), an invasive pest of several species of Eucalyptus has been reported for the first time in Asia. It was first detected in Shenzhen, China where it has become established. Currently, T. sloanei is not a destructive forest pest in Shenzhen. Pupae and adults were frequently found infected by an unknown fungus.
ZnO nanowire array ultraviolet photodetectors with self-powered properties
Zhiming Bai,Xiaoqin Yan,Xiang Chen,Hanshuo Liu,Yanwei Shen,Yue Zhang 한국물리학회 2013 Current Applied Physics Vol.13 No.1
A ZnO nanowire (NW) array ultraviolet photodetector (PD) with Pt Schottky contacts has been fabricated on a glass substrate. Under UV light illumination, this PD showed a high photo-to-dark current ratio of 892 at 30 V bias. Interestingly, it was also found that this PD had a high sensitivity of 475 without external bias. This phenomenon could be explained by the asymmetric Schottky barrier height (SBH) at the two ends causing different separation efficiency of photogenerated electronehole pairs, which resulted in the formation of photocurrent. It is anticipated to have potential applications in self-powered UV detection field.
Bin Cheng,Chen Lu,Dongliang Lin,Xiaoqin Zeng 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.2
A Mg95.5Y3Zn1.5 alloy processed via a two-step processing route of extrusion plus ECAP has been investigated. It was found that the ECAP processed Mg95.5Y3Zn1.5 alloy contained ultrafine grains and exhibitedexcellent mechanical properties. After ECAP, the average grain size of Mg95.5Y3Zn1.5 alloy was refined toabout 300 nm. The highest strengths, with yield strength of 444.6 MPa and ultimate tensile strength of472.7 MPa, were obtained after 1 pass at 623 K. The SAED patterns indicated that the microstructure afterECAP consisted of both high angle and low angle grain boundaries. The fraction of high-angle boundariesincreased with increasing numbers of ECAP passes. The Mg95.5Y3Zn1.5 alloy contained a high volume fractionof X-Mg12ZnY phase due to high yttrium and zinc addition. And, it accelerated the growth and coalescenceof cracks during tensile testing, resulting in premature fracture and lower elongation of alloy.
Liu, Bo,Tang, Chaojun,Chen, Jing,Xie, Ningyan,Tang, Huang,Zhu, Xiaoqin,Park, Gun-sik Springer US 2018 NANOSCALE RESEARCH LETTERS Vol.13 No.1
<P>It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials. The unit cell of the metamaterials is composed of a graphene monolayer sandwiched between four Ag nanodisks with different diameters and a SiO<SUB>2</SUB> spacer on an Ag substrate. The near-field plasmon hybridizations between individual Ag nanodisks and the Ag substrate form four independent magnetic dipole modes, which result into multiband absorption enhancement of monolayer graphene at optical frequencies. When the resonance wavelengths of the magnetic dipole modes are tuned to approach one another by changing the diameters of the Ag nanodisks, a broadband absorption enhancement can be achieved. The position of the absorption band in monolayer graphene can be also controlled by varying the thickness of the SiO<SUB>2</SUB> spacer or the distance between the Ag nanodisks. Our designed graphene light absorber may find some potential applications in optoelectronic devices, such as photodetectors.</P>
Yanwei Shen,Xiang Chen,Xiaoqin Yan,Fang Yi,Zhiming Bai,Xin Zheng,Pei Lin,Yue Zhang 한국물리학회 2014 Current Applied Physics Vol.14 No.3
High quality n-ZnO/p-GaN heterojunction was fabricated by growing highly crystalline ZnO epitaxial films on commercial p-type GaN substrates via radio frequency (RF) magnetron sputtering. Low-voltage blue light emitting diode with a turn-on voltage of w2.5 V from the n-ZnO/p-GaN heterojunction was demonstrated. The diode gives a bright blue light emission located at w460 nm and a low threshold voltage of 2.7 V for emission. Based on the results of the photoluminescence (PL) and electroluminescence (EL) spectra, the origins of the EL emissions were studied in the light of energy band diagrams of ZnOeGaN heterojunction, and may attribute to the radiative recombination of the holes in p-GaN and the electrons injected from n-ZnO, which almost happened on the side of p-GaN layer. These results may have important implications for developing short wavelength optoelectronic devices.
Quanxi Wang,Baocheng Wu,Mengxi Liu,Xiaoqin Yuan,Chunyan Li,Shiyi Chen,Yubin Zhuang,Yijian Wu,Yifan Huang 한국유전학회 2017 Genes & Genomics Vol.39 No.11
This study was to investigate the molecular mechanism underlying the apoptosis induced by Muscovy duck reovirus (MDRV) through a transcriptomic analysis. Muscovy ducklings were infected with MDRV strain YB and the apoptotic cells in their livers were examined with terminal-deoxynucleotidyl-transferase-mediated nick end labeling and flow cytometry. Genes differentially expressed in the livers of the MDRV-infected ducklings were screened by comparing them with those of uninfected ducklings and were analyzed with a transcriptomic method to illuminate the mechanism of MDRV infection. The results showed that MDRV infection strongly induced apoptotic cells in liver. Significant pathway enrichment determined by a Kyoto Encyclopedia of Genes and Genomes analysis showed that MDRV activated the death receptor family signaling pathway (Fas, TNFR1), the interleukin receptor signaling pathway (IL1, IL3), the phosphatidylinositol 3-kinase signaling pathway, NF-ҝB signaling pathway and calcium ions signaling pathway to induce apoptosis. This was verified by SYBR-Green-based fluorescence quantitative PCR. In conclusion, MDRV induce apoptosis by activation multi signaling pathways.
I-Son Ng,Xuesong Zheng,Bor-Yann Chen,Xiaoqin Chi,Yinghua Lu,Chun-Sheng Chang 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.1
The first-attempt study employed a proteomics strategy for the identification of abundant proteins from a bioelectricity generation and dye decolorization bacterium Proteus hauseri ZMd44. By using the degenerated primers designed based on the peptide sequences from tandem mass spectroscopy and the whole genomics annotation of the closely associated strain, Proteus penneri ATCC 35198,the genes were successfully obtained for two full-length genes of 543 bp (laccase) and 1,086 bp (Omp F, porin)encoding to 181 amino acids and 362 amino acids,respectively. It explored laccase and NADH dehydrogenase involvement in the oxidation-reduction reaction as well, as porin played an important role in providing channels for related proteins in the accomplishment of electron transportation in P. hauseri. Detailed enzymatic assays indicated that laccase activity of 542.2 U/DCW could be stimulated by 2.5 mM copper induction in LB medium (ca. 293-fold to those without copper induction). Among intracellular proteins, NADH dehydrogenase activity of 257.2 U/mg via mediator riboflavin was in parallel with the decolorizing capability of azo dye Rb160 that only took place in LB medium. From the evaluation of kinetic parameters (Vmax and Km were 0.272 U/min and 0.393 mM with ABTS,0.046 U/min and 43.8 μM with NADH), it is better to decipher the decolorization mechanism of ZMd44 indicating that laccase and NADH dehydrogenase played the most crucial role for azo dye decolorization.