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- 저자 : Lude Lu (검색결과 2 건)
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Lu Wang,Xiaoheng Liu,Xin Wang,Xujie Yang,Lude Lu 한국물리학회 2010 Current Applied Physics Vol.10 No.6
Mesoporous Co3O4 microspheres with unique crater-like morphology were obtained by utilizing the mesoporous silica material MCM-41 as a template. The analysis results of N2 adsorptionedesorption measurement indicate that the product has a large BrunauereEmmetteTeller (BET) surface area of 60 m2 g-1 and a narrow pore size distribution centering around 3.7 nm. Its electrochemical properties were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS)measurements. The findings reveal that this novel morphology material has a smaller inner resistance of about 0.4 U and a higher onset frequency of 550 Hz. This material can provide a high specific capacitance of 102 F g-1 and a large capacity retention of 74% in 500 continuous cycles test at a sweep rate of 3 mV s-1. More significantly, the mass loading of electroactive species can reach as large as 2 mg cm-2, which is one order of magnitude larger than common amount used.
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Ag2O nanoparticle clusters coated with porous gelatin-g-PMMA copolymer
Ying Liu,Xiaoheng Liu,Xiaodong Wu,Xujie Yang,Lude Lu 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Herein a special nanoparticle cluster coated with a porous copolymer is designed and prepared. At first,Ag2O nanoparticles (secondary particles) were fabricated in gelatin solution by a facile chemical approach. Then these nanoparticles were entrapped in a copolymerization system containing gelatin,methyl methacrylate (MMA), an initiator, and using water as a solvent. The nanoparticle clusters coated with porous gelatin-g-PMMA copolymer (Ag2O/gelatin-g-PMMA) were prepared by grafting methyl methacrylate onto gelatin, followed by coating solidification. One significant feature for our approach is that every Ag2O aggregated cluster has been coated with porous gelatin-g-PMMA copolymer film in a unique way, and the Ag2O nanoparticle could penetrate and escape from the coating freely in water by ultrasonication. As a result, this study provides a new approach to prepare monodispersed nanoparticles by ordered porous copolymers with controlled releasing.
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