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HUI WANG,QIANWANG CHEN,XUHUI ZHOU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.1
This paper demonstrates the application of negative charge-functionalized carbon-encapsulated superparamagnetic colloidal nanoparticles being as nanoadsorbents for the removal of cationic dyes from aqueous solutions. Adsorption characteristics of the magnetic nanoadsorbents were examined using methylene blue as adsorbates, exhibiting excellent ability to remove cationic dyes from aqueous solutions. In addition, the influences of uptake time, concentration of nanoadsorbents and pH values of aqueous solution on the removal of cationic dyes have been discussed. Results show that the removal efficiency can be up to 90% at a dye concentration of 100 mg L-1 when the uptake time is 1 min, which indicates rapidly removal ability of the magnetic nanoadsorbents. Furthermore, other cationic dyes including rhodamine B and methyl violet were used to examine the universality of nanoadsorbents.
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GAMMA-RAY IRRADIATION-INDUCED IMPROVEMENT OF HYDROGEN ADSORPTION IN MULTI-WALLED CARBON NANOTUBES
WEN QIAN,JIAFU CHEN,LINGZHI WEI,LIUSUO WU,QIANWANG CHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.1
An improved hydrogen adsorption capacity of 0.5–0.6 wt% was obtained at room temperature and 10.0 MPa pressure for commercial MWNT sample by γ-ray irradiation, compared with 0.33 wt% of pristine MWNTs. The irradiation-induced defects in structure, which is favorable for hydrogen adsorption, were characterized by ESR spectrum, elemental analysis, and Raman spectrum. The results show that γ-ray irradiation increased the hydrogen adsorption capacity due to the increasing number of defects created by γ-photons, but would reach the maximum when defect concentration achieves saturation.
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HUI WANG,YIFEI YU,YUBIN SUN,QIANWANG CHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.1
One-dimensional (1D) chain-like structures are of special significance because of their interparticle magnetic interactions and potential applications in various fields, such as micromechanical sensors. This paper attempts to review the field of research into magnetic chains including monatomic chains and nanoparticle chains. The synthesis methods used mostly belong to one of the following categories: magnetosome chains in magnetotactic bacteria, zero-field self-assembly, magnetic field induced (MFI) assembly, template-directed synthesis, and gas phase synthesis. The potential applications of nanoparticle chains, mainly in the field of magnetic recording media, sensor, biomedicine and magnetic-field tunable photonic crystal are discussed.
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SYNTHESIS OF PEG-ENCAPSULATED SUPERPARAMAGNETIC COLLOIDAL NANOCRYSTALS CLUSTERS
HUI WANG,YIMING LI,ZHAOFENG LUO,SHUAI ZHOU,JIN SHENG,QIANWANG CHEN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.6
PEG-encapsulated colloidal nanocrystal clusters (CNCs) have been synthesized via a one-step solvothermal process at a temperature of 230°C. The composition, phase, and morphology of these CNCs have been characterized by X-ray diffraction and transmission electron microscopy. Studies show that each particle is a cluster structure consisting of small primary iron oxide nanocrystals. Magnetic measurements reveal the superparamagnetic nature of these CNCs at room temperature. The CNCs with different sizes (80 nm or 95 nm) can be obtained by changing the time of reaction. The dispersibility and colloidal stability of these CNCs with PEG as the major surface group have also been discussed. In vitro cytotoxicity of these CNCs with different thickness PEG layer on HeLa cell has also been assayed. Cytotoxicity results reveal that the CNCs concentration and the incubation time can influence the cell viability, and the size of CNCs almost does not affect the cell viability.
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Qian Wang,Yingxia Yang,Guoqing Lu,Xianjun Sun,Youren Feng,Shuangyong Yan,Huiyuan Zhang,Qiyan Jiang,Hui Zhang,Zheng Hu,Rui Chen 한국유전학회 2020 Genes & Genomics Vol.42 No.11
Background Salinity stress, as the key limiting factor for agricultural productivity, can activate a series of molecular responses and alter gene expression in plants. Endogenous regulatory small RNAs, such as microRNAs (miRNAs) and phased siRNAs (phasiRNAs), play crucial roles during stress adaptation and prevent the injury from environmental circumstances. Objective To identify long-term salt stress responsive miRNAs and phasiRNAs as well as their associated genes and pathways in soybean roots. Methods Small RNA and degradome sequencing strategies were applied to genome widely investigate miRNAs and phasiRNAs in soybean roots under control and long-term salt stress conditions. Results In this study, stringent bioinformatic analysis led to the identifcation of 253 conserved and 38 novel miRNA candidates. Results of expression profling, target and endogenous target mimics predictions provided valuable clues to their functional roles. Furthermore, 156 genes were identifed to be capable of generating 21 nt and 24 nt phasiRNAs, in which 37 candidates were confrmed by degradome data for miRNA-directed cleavage. Approximately 90% of these phasiRNA loci were protein coding genes. And GO enrichment analysis pointed to “signal transduction” and “ADP binding” entries and refected the functional roles of identifed phasiRNA genes. Conclusion Taken together, our fndings extended the knowledge of salt responsive miRNAs and phasiRNAs in soybean roots, and provided valuable information for a better understanding of the regulatory events caused by small RNAs underlying plant adaptations to long-term salt stress.
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The Analysis and Comparison of the Needle-puncture Property of Four Types of Silkworm Cocoons
Qian Wang,Yan Zhang,Hao Chen,Rong Zhang,Xuhong Yang,Ping Wang,Pibo Ma 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
Silkworm cocoons display outstanding properties in many aspects, such as thermal protection, biocompatibilityand mechanical resistance and so on. In this paper, we focus on the puncture properties without detailed exploration of fourtypes of cocoons (three domesticated cocoon and Eri silkworm). Different sections, end and middle, as well as differentdirections, puncturing from inner and outer surface, of four types of aforementioned cocoons were systematically analyzedand compared. The results of present research show that the middle section exhibits a relatively greater needle-punctureresistance compare with end section for three B. mori silkworm cocoons. With regard to different puncture directions, fromexternal and internal surface, puncturing from internal surface exhibits a relatively higher needle-puncture load as well asfracture displacement tendencies compared with needle-puncture performance from external surface no matter in middle orend sections. Combining physical parameter assessment, statistical analysis and needle-puncture performance, this researchinspires a clear-cut frame to design a composite with high puncture resistance.
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