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Mathematical Models For Continuous Electrospun Nanofibers And Electrospun Nanoporous Microspheres, Ji-Huan He, Lan Xu, Yue Wu, Yong Liu
Mathematical Models For Continuous Electrospun Nanofibers And Electrospun Nanoporous Microspheres, Ji-Huan He, Lan Xu, Yue Wu, Yong Liu
Ji-Huan He
Abstract: A brief review of mathematical models of electrospinning is given. The nano-effect and electrospinning dilation are presented to explain how to prepare extremely high strength continuous nanotibers and nanoporous microspheres, respectively. According to the established models, vibration-electrospinning is introduced to improve electrospinability, Siro-electrospinning is suggested to mimic the spinning procedure of a spider and magneto-electrospinning is used to control the instability arising in the electrospinning process. A new theory linked to both classical mechanics and quantum mechanics should be developed to explain certain special phenomena in electrospinning. E-infinity theory is considered to be a potential theory to deal with …
Sintering Of Cu–Al2o3 Nano-Composite Powders Produced By A Thermochemical Route, Zeljko J. Kamberovic
Sintering Of Cu–Al2o3 Nano-Composite Powders Produced By A Thermochemical Route, Zeljko J. Kamberovic
Zeljko J Kamberovic
This paper presents the synthesis of nano-composite Cu–Al2O3 powder by a thermochemical method and sintering, with a comparative analysis of the mechanical and electrical properties of the obtained solid samples. Nano-crystalline Cu–Al2O3 powders were produced by a thermochemical method through the following stages: spray-drying, oxidation of the precursor powder, reduction by hydrogen and homogenization. Characterization of powders included analytical electron microscopy (AEM) coupled with energy dispersive spectroscopy (EDS), differenttial thermal and thermogravimetric (DTA–TGA) analysis and X-ray diffraction (XRD) analysis. The size of the produced powders was 20–50 nm, with a noticeable presence of agglomerates. The composite powders were characterized by …
Synthesis And Sintering Of Cu-Al2o3 Nanocomposite Powders Produced By A Thermochemical Route, Zeljko J. Kamberovic
Synthesis And Sintering Of Cu-Al2o3 Nanocomposite Powders Produced By A Thermochemical Route, Zeljko J. Kamberovic
Zeljko J Kamberovic
By hydrometallurgy and powder metallurgy along with prognosis of physical- chemical properties, a synthesis of new improved materials can be successfully performed with in advance pre-set properties which is conditioned by a quality of starting powders i.e. by improving their structure. In accordance with that, this paper presents synthesis of the nanocomposite Cu-Al2O3 powder by thermochemical method and sintering with a comparative analysis of the mechanical and electrical properties of obtained solid samples. Nanocrystaline Cu-Al2O3 powders were produced by thermochemical method through following stages: spray-drying, oxidation of precursor powder, reduction by hydrogen and homogenisation. Characterization of powders included differential-thermal and …
Bubble Electrospinning For Mass Production Of Nanofibers, Yong Liu, Ji-Huan He
Bubble Electrospinning For Mass Production Of Nanofibers, Yong Liu, Ji-Huan He
Ji-Huan He
A new bottom-up gas-jet electrospinning process for mass production is presented. A bubble-induced cone on the surface of polymer solution is equivalent to the Taylor cone in traditional electrospinning, which is a must for producing nanofibers. In this study bubbles are produced by compressed air or nitrogen through a nozzle settled in the bottom of the solution. Multiple jets are observed during the electrospinning process as predicted for it is easy to many bubble-induced cones on the solution surface. The new electrospinning mechanism can be used for mass production of nanofibers.
Electrospinning Of High-Molecule Peo Solution, Yu-Qin Wan, Ji-Huan He, Jian-Yong Yu, Yue Wu
Electrospinning Of High-Molecule Peo Solution, Yu-Qin Wan, Ji-Huan He, Jian-Yong Yu, Yue Wu
Ji-Huan He
Electrospinning is a simple but powerful method for making nanofibers that can then be collected to create porous mats. We expand the range of this technique by making nanofibers from macromolecules with a molecular weight of 3,000,000, namely poly(ethylene oxide) (PEO). Gelation of PEO blocks its spinning by traditional electrospinning. PEO was mixed with pure alcohol, and in specific concentration 10 wt % and under vibration condition, the mixed solution behaves like polymers for electrospinning, the average diameter of the obtained nanofibers is about 100 nm. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3840-3843, 2007
Electrospinning: The Big World Of Small Fibers, Ji-Huan He
Electrospinning: The Big World Of Small Fibers, Ji-Huan He
Ji-Huan He
Similar to the nuclear age, the so-called nanoage is coming, the growing gap between nano haves and nano have-nots, however, will remain, as has global competition, particularly from the electrospinning technology.