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RISS 인기검색어
- 검색키워드
- 저자 : Huixia Feng (검색결과 6 건)
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Experimental and Numerical Research on the Laser Impact Welding of Ti/SS
Jiaxin Lu,Huixia Liu,Hao Jin,Feng Li,Xiaojun Wang,Xiao Wang 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.5
The welding of Ti/SS metal foil was realized by laser impact welding. The interface morphology and mechanical properties of welding specimens were studied by systematic experiments, and the experimental phenomena were revealed by smoothed particle hydrodynamics numerical simulation. Results indicated that the plastic deformation of the composite plate and the springback of the welding spot center were small under low laser pulse energy and enlarged under high laser pulse energy. Impinging jet, interface wave, and interface cracking were found at the micro-interface of the welding specimens. Increasing the laser pulse energy resulted in the transition of the interface waveform from straight to microwave and finally to wave primarily because of the change in interfacial impact pressure and effective plastic strain. Energy dispersive spectroscopy analysis showed that the trace element diff used at the welding interface, and no intermetallic compounds were formed. SPH simulation revealed that the thickness of the high-temperature layer was related to the thickness of the diffusion layer. As the distance between the test point and welding interface increased, the hardness decreased. The maximum tensile force of the welding specimens increased with laser pulse energy. The failure mode of the interface was welding spot edge fracture failure.
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Long-Lu,류성기,Guangguang Feng,Minghao Ren,Huixia Zhang 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
The compound technology of ion nitriding and multi-arc ion plating is adopted to make Ti1-xAlxN film on 40 Cr. The influence of Al content to the structure and functions of film is analyzed through SEM (Scanning Electron Telescope), XRD analyzer,micro hardness tester and scratch tester. It indicated that the Al content has obvious influence on the structure and function of film. The more Al content, the more droplets in the film. Phase structure tends to multiphase composite structures. The micro hardness and bonding force will be increased first, and then decreased with the rising Al content.
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Removal of methylene blue from aqueous solution by a carbon-microsilica composite adsorbent
Deyi Zhang,Ying Ma,Huixia Feng,Heming Luo,Jiao Chen,Yuan Hao 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
Microsilica, one kind of industrial solid waste material, was utilized firstly to prepare a carbon-microsilica composite adsorbent (CMS). The prepared adsorbent was characterized with XPS, SEM and Gas sorption experiments. The results indicated the SO3H groups, which are very effective in capturing cationic organic dye, were introduced onto the surface of CMS; the Brunauer-Emmett-Teller (BET) surface area (SBET) and total pore volume (Vtotal) of CMS reach 51m2/g and 0.045 cm3/g, respectively. Meanwhile, the possibility of the utilization of the adsorbent for removal of methylene blue (MB) from aqueous solution was investigated. The effect of pH, contact time and initial MB concentration for MB removal were studied. Equilibrium data were modeled using the Langmuir, Freundlich and Dubinin-Radushkevich equations to describe the equilibrium isotherms. It was found that data fit to the Langmuir equation better than the Freundlich equation. Maximum monolayer adsorption capacity was calculated at different temperatures (298,308, and 318 K) reach 251.81, 283.76 and 309.70 mg/g, respectively. It was observed that adsorption kinetics obeys the pseudo- first-order equation.
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Wang, Kunjie,Li, Mingliang,Li, Hongxia,Guan, Feng,Zhang, Deyi,Feng, Huixia,Fan, Haiyan Korean Chemical Society 2015 대한화학회지 Vol.59 No.2
We have discovered that quercetin, once coated on the CdSe and CdSe-CdS quantum dots (QDs), becoming highly water soluble. In the present work, we have successfully synthesized CdSe/CdS/N-Acetyl-L-Cysteine(NAC)/Quercetin nano-composites in the aqueous solution. The products were characterized using UV-vis spectroscopy, X-ray powder diffraction, fluorescence spectroscopy, and Fourier transform infrared spectroscopy. The transmission electron microscopy (TEM) tests indicated that our nano-composite products are highly stable with homogeneous particle size and great monodispersity. Quercetin coated nano-composite CdSe/CdS/NAC/Quercetin showed different fluorescence behavior from that of CdSe/CdS/NAC. Most amazingly, the synthesized CdSe/CdS/NAC/Quercetin nano-composite exhibits strong antibacterial activity. The combination of the strong fluorescence and its antibacterial activity makes the quercetin modified quantum dots as a potential candidate for cancer targeted therapy and other cancer treatments.
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Preparation of Functionalized Magnetic Silica Nanospheres for the Cellulase Immobilization
Wenjuan Zhang,Jianhui Qiu,Limin Zang,Eiichi Sakai,Huixia Feng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
Cellulase was immobilized on functionalized magnetic silica nanospheres using glutaraldehyde as a cross-linking agent. The morphologies, structures and magnetic properties of this immobilized cellulase were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential thermal analysis and vibrating sample magnetometry. The properties of immobilized cellulase were investigated, including the amount of immobilized cellulase and its relative activity, stability and reusability. The results indicated that immobilized cellulase exhibited better resistance to high temperature and pH inactivation in comparison to free cellulase. Moreover, immobilized cellulase with and without cross-linking agent were investigated and the former had greater amount of immobilized cellulase and better operational stability. The amount of immobilized cellulase with the cross-linking agent was 92 mg/g support. Furthermore, the activity of the immobilized cellulase was still 85.5% of the initial activity after 10 continuous uses, demonstrating the potential of this immobilized cellulase for large-scale biofuel production.
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Deyi Zhang,Mei Han,Yubing Li,Bing Wang,Yi Wang,Kunjie Wang,Huixia Feng 한국탄소학회 2017 Carbon Letters Vol.23 No.-
This paper introduces a nitrogen-doped ordered mesoporous carbon (NOMC) derived from glucosamine with hybrid capacitive behaviors, achieved by successfully combining electrical double-layer capacitance with pseudo-capacitance behaviors. The nitrogen doping content of the fabricated NOMC reached 7.4 at% while its specific surface area (SBET) and total pore volume reached 778 m2 g?1 and 1.17 cm3 g?1, respectively. A dual mesoporous structure with small mesopores centered at 3.6 nm and large mesopores centered at 9.9 nm was observed. The specific capacitance of the reported materials reached up to 328 F g?1, which was 2.1 times higher than that of pristine CMK-3. The capacitance retention rate was found to be higher than 87.9% after 1000 charge/discharge cycles. The supplementary pseudocapacitance as well as the enhanced wettability and conductivity due to the incorporation of nitrogen heteroatoms within the carbon matrixes were found to be responsible for the excellent capacitive performance of the reported NOMC materials.
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