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RISS 인기검색어
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- 저자 : Yanxia Xie (검색결과 3 건)
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Zeng, Yanxia,Zhu, Xiashi,Xie, Jiliang,Chen, Li Techno-Press 2021 Advances in nano research Vol.10 No.3
A new ionic liquid functionalized magnetic silica nanoparticle was synthesized and characterized and tested as an adsorbent. The adsorbent was used for magnetic solid phase extraction on ICP-MS method. Simultaneous determination of precious metal Au has been addressed. The method is simple and fast and has been applied to standard water and surface water analysis. A new method for separation/analysis of trace precious metal Au by Magnetron Solid Phase Extraction (MSPE) combined with ICP-MS. The element to be tested is rapidly adsorbed on CoFe2O4@SiO2@[BMIM]PF6 composite nano-adsorbent and eluted with thiourea. The method has a preconcentration factor of 9.5-fold. This method has been successfully applied to the determination of gold in actual water samples. Hydrophobic Ionic Liquids (ILs) 1-butyl-3-methylimidazole hexafluorophosphate ([BMIM]PF6) coated CoFe2O4@SiO2 nanoparticles with core-shell structure to prepare magnetic solid phase extraction agent (CoFe2O4@SiO2@ILs) and establish a new method of MSPE coupled with inductively coupled plasma mass spectrometry for separation/analysis of trace gold. The results showed that trace gold was adsorbed rapidly by CoFe2O4@SiO2@[BMIM]PF6 and eluanted by thiourea. Under the optimal conditions, preconcentration factor of the proposed method was 9.5-fold. The linear range, detection limit, correlation coefficient (R) and relative standard deviation (RSD) were found to be 0.01~1000.00 ng·mL-1, 0.001 ng·mL-1, 0.9990 and 3.4% (n = 11, c = 4.5 ng·mL-1). The CoFe2O4@SiO2 nanoparticles could be used repeatedly for 8 times. This proposed method has been successfully applied to the determination of trace gold in water samples.
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Zongqian Wang,Haiwei Yang,Ning Pan,Wei Li,Yanxia Xie,Zhi Liu,Yinchun Fang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
Polyethylene/Polypropylene (PE/PP) composite non-woven fabrics have been used widely for surgical packagesdue to its dual features of PE surface and PP surfaces. PP fabric pre-treated by hydrophilic agent provides high waterabsorbency, while PE surface is responsible for high barrier functions. However, the PP water absorbency declines once PEfilm is laminated, and no report devoted to study the extent and the reasons of this declining. Herein, the hydrophilic finishingof the PP non-woven fabrics was processed via Kiss-roll method, then the PE/PP fabrics were obtained using a normal hotmelt adhesive PE film laminating process. The wicking height, water absorption specific gravity (LAC%), static contactangle, as well as the complete wetting time of the finished PP and PE/PP fabric were measured and compared. Meanwhile,the SEM was used to detect the morphology changing. The results revealed that the pores between fibers in the PP nonwovenwere filled with non-hydrophilic hot melt adhesive penetrated during PE lamination, so that the PP structure changedto be less porous. Moreover, the laminated PP layer actually blocks the water flow channel in the system, resulting in theabsorbency reduction after lamination. As a result, comparing with the PP non-woven fabric, the wicking height of the PE/PPfabric decreased by 25.3 %, the LAC % value reduced by 40.83 %, and the complete wetting time extended from 0.29 s to1.74 s.
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Control Over the Branched Structures of Platinum Nanocrystals for Electrocatalytic Applications
Ma, Liang,Wang, Chengming,Gong, Ming,Liao, Lingwen,Long, Ran,Wang, Jinguo,Wu, Di,Zhong, Wei,Kim, Moon J.,Chen, Yanxia,Xie, Yi,Xiong, Yujie American Chemical Society 2012 ACS NANO Vol.6 No.11
<P>Structural control of branched nanocrystals allows tuning two parameters that are critical to their catalytic activitythe surface-to-volume ratio, and the number of atomic steps, ledges, and kinks on surface. In this work, we have developed a simple synthetic system that allows tailoring the numbers of branches in Pt nanocrystals by tuning the concentration of additional HCl. In the synthesis, HCl plays triple functions in tuning branched structures <I>via</I> oxidative etching: (i) the crystallinity of seeds and nanocrystals; (ii) the number of {111} or {100} faces provided for growth sites; (iii) the supply kinetics of freshly formed Pt atoms in solution. As a result, tunable Pt branched structurestripods, tetrapods, hexapods, and octopods with identical chemical environmentcan be rationally synthesized in a single system by simply altering the etching strength. The controllability in branched structures enables to reveal that their electrocatalytic performance can be optimized by constructing complex structures. Among various branched structures, Pt octopods exhibit particularly high activity in formic acid oxidation as compared with their counterparts and commercial Pt/C catalysts. It is anticipated that this work will open a door to design more complex nanostructures and to achieve specific functions for various applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-11/nn304237u/production/images/medium/nn-2012-04237u_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn304237u'>ACS Electronic Supporting Info</A></P>
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