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Preparation of Flaky Hexagonal nanoporous Au-Cu and Au particles via Dealloying

Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1777-1786页

作者： Jing Deng Yuan-Yun Zhao Yong Shen Chuntao Chang Qiang Li School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China Neutron Scattering Technical Engineering Research Center School of Mechanical EngineeringDongguan University of TechnologyDongguan 523808China Guangdong-HongKong-Macao Joint Laboratory for Neutron Scattering Science and TechnologyDongguan University of TechnologyDongguan 523808China Instituteof Metal Research Chinese Academy of SciencesShenyang 110016China

nanoporous metals have attracted signifi cant attention owing to their excellent physical,chemical,and biological ***,preparing ultrafi ne nanoporous metal particles(1–5μm)with specifi c geometries remains ***,we report a simple strategy to prepare ultrafi ne fl aky hexagonal nanoporous Au-Cu and Au particles via ***-based alloy ribbons with ultrafi ne fl aky hexagonal Mg-Au(Cu)-Gd particles dispersed in a Mg-Cu(Au)-Gd metallic glassy matrix were *** size and morphology of the precipitated fl aky hexagonal Mg-Au(Cu)-Gd particles were controlled by the solidifi cation process of a Mg 61 Cu 21 Au 7 Gd 11 alloy *** ne fl aky hexagonal nanoporous Au-Cu particles(diagonal diameter 2.58±0.44μm,ligament size~28 nm),Au-1 particles(diagonal diameter 2.38±0.35μm,ligament size~83 nm)and Au-2 particles(diagonal diameter 2.39±0.44μm,ligament size~66 nm)were prepared via ultrasonic-assisted dealloying of Mg 61 Cu 21 Au 7 Gd 11 alloy ribbons in 0.25 M HCl/ethanol,1 M HCl/ethanol and 0.25 M HNO 3/ethanol solutions,*** ultrafi ne fl aky hexagonal nanoporous Au-Cu and Au particles with a large specifi c surface area have a uniform particle size and shape,implying that they possess adequate powder fl uidity and excellent catalytic ***,the formation mechanism of the MgAu(Cu)Gd phase in solidifi ed Mg-Cu-Au-Gd alloys was *** study provides a novel approach for synthesizing nanoporous metal particles with a specifi c geometry.

关键词： Metallic glasses Mg-based alloys Dealloying nanoporous particles Mg-Au-Gd phase

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Size-controlled flow synthesis of metal-organic frameworks crystals monitored by in-situ ultraviolet-visible absorption spectroscopy

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Chinese Chemical Letters 2021年第3期32卷 1131-1134页

作者： Wenbo Li Yucen Li Wei Zhang Difeng Yin Ya Cheng Wei Chu Ming Hu State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China School of Physical Science and Technology ShanghaiTech UniversityShanghai 200031China State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China XXL-The Extreme Optoelectromechanics Laboratory School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China University of Chinese Academy of Sciences Beijing 100049China

Size-controlled flow synthesis of nanoporous particles are of considerable interest for future industrial applications,however,is facing challenges due to lack of in-situ method for size-characterization in fluidic *** present that ultraviolet-visible(UV-vis)absorption spectroscopy can be integrated into a flow-synthesis system which was produced by femtosecond laser micro *** shift of the absorption peak position of the ex-situ and in-situ UV-vis spectra correlates to variation of size of porous metal-organic frameworks ***-67 crystals with a size in the range from 200 nm to1025 nm are fabricated with the assistance of tri-ethylamine under monitoring of in-situ UV-vis *** ZIF-67 crystals are converted into nanoporous carbons particles with controlled *** materials show size-dependent performance in Na-ion battery and size-independent performance in metal/H_(2)O seawater battery.

关键词： nanoporous particles Microfluidics Flow synthesis Metal-organic frameworks UV-vis absorption spectrum Femtosecond laser micromachining

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