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Biomedical Engineering and Bioengineering Commons™
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Articles 1 - 10 of 10
Full-Text Articles in Biomedical Engineering and Bioengineering
Integration Of Biosensors Based On Microfluidic: A Review
Integration Of Biosensors Based On Microfluidic: A Review
Faculty of Engineering University of Malaya
Purpose - Biotechnology is closely associated to microfluidics. During the last decade, designs of microfluidic devices such as geometries and scales have been modified and improved according to the applications for better performance. Numerous sensor technologies existing in the industry has potential use for clinical applications. Fabrication techniques of microfluidics initially rooted from the electromechanical systems (EMS) technology. Design/methodology/approach - In this review, we emphasized on the most available manufacture approaches to fabricate microchannels, their applications and the properties which make them unique components in biological studies. Findings - Major fundamental and technological advances demonstrate the enhancing of capabilities and …
Biomimic Fabrication Of Electrospun Nanofibers With High-Throughput, Ji-Huan He, Yong Liu, Lan Xu, Jian-Yong Yu, Gang Sun
Biomimic Fabrication Of Electrospun Nanofibers With High-Throughput, Ji-Huan He, Yong Liu, Lan Xu, Jian-Yong Yu, Gang Sun
Ji-Huan He
Spider-spun fiber is of extraordinary strength and toughness comparable to those of electrospun fiber, the later needs a very high voltage (from several thousands voltage to several ten thousands voltages) applied to water-soluble protein “soup” that was produced by a spider, furthermore, its mechanical strength dramatically decreases comparable to spider silk. A possible mechanism in spider-spinning process is given, the distinct character in spider-spinning is that its spinneret consists of millions of nano scale tubes, and a bubble can be produced at the apex of each nano-tube. The surface tension of each bubble is extremely small such that it can …
Controlling Numbers And Sizes Of Beads In Electrospun Nanofibers, Yong Liu, Ji-Huan He, Jian-Yong Yu, Hong-Mei Zeng
Controlling Numbers And Sizes Of Beads In Electrospun Nanofibers, Yong Liu, Ji-Huan He, Jian-Yong Yu, Hong-Mei Zeng
Ji-Huan He
Abstract BACKGROUND: Electrospinning is a powerful and effective method to produce nanofibers. Beads have been observed widely in electrospun products, but effects of solvents, weight concentrations and salt additives on the number and morphology of beads in the electrospinning process have not been systematically studied. RESULTS: Both theoretical analysis and experimental results show that beads strongly depend upon solvents, weight concentrations and salt additives. Either a suitable weight concentration or a suitable salt additive can completely prevent the occurrence of beads in the electrospinning process; solvents can affect the number of beads and the morphology of electrospun fibers. CONCLUSION: Beads …
A New Resistance Formulation For Carbon Nanotubes, Ji-Huan He
A New Resistance Formulation For Carbon Nanotubes, Ji-Huan He
Ji-Huan He
A new resistance formulation for carbon nanotubes is suggested using fractal approach. The new formulation is also valid for other nonmetal conductors including nerve fibers, conductive polymers, and molecular wires. Our theoretical prediction agrees well with experimental observation.
Non-Ionic Surfactants For Enhancing Electrospinability And For The Preparation Of Electrospun Nanofibers, Shu-Qiang Wang, Ji-Huan He, Lan Xu
Non-Ionic Surfactants For Enhancing Electrospinability And For The Preparation Of Electrospun Nanofibers, Shu-Qiang Wang, Ji-Huan He, Lan Xu
Ji-Huan He
Abstract BACKGROUND: Electrospinning is widely used to produce nanofibers; however, not every polymer can be electrospun into nanofibers. To enhance electrospinability, much effort has been made in designing new apparatus, such as vibration-electrospinning, magneto-electrospinning and bubble-electrospinning. RESULTS: A representative non-ionic surfactant, TritonR X-100, is used to enhance electrospinability. The surfactant is added to an electrospun poly(vinyl pyrrolidone) polymer solution, and a dramatic reduction in surface tension is observed. As a result, a moderate voltage is needed to produce fine nanofibers, which are commonly observed during the conventional electrospinning procedure only at elevated voltage. CONCLUSION: The novel strategy produces smaller nanofibers …
Electrospinning: A Promising Technology For Discontinuous And Continuous Nanofibers, Ji-Huan He
Electrospinning: A Promising Technology For Discontinuous And Continuous Nanofibers, Ji-Huan He
Ji-Huan He
No abstract provided.
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 …
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.
Allometric Scaling And Instability In Electrospinning, Ji-Huan He, Yu-Qin Wan, Jian-Yong Yu
Allometric Scaling And Instability In Electrospinning, Ji-Huan He, Yu-Qin Wan, Jian-Yong Yu
Ji-Huan He
The regulation of scale and bifurcation-like instability in electrospinning are intriguing and enduring problems after the technology was invented by Formhals in 1934. Regulatory mechanisms for controlling the radius of electrospun fibers are clearly illustrated in the different states. Generally, the relationship between radius r of jet and the axial distance z from nozzle can be expressed as an allometric equation of the form , the values of the scaling exponent (b) for the initial steady stage, instability stage, and terminal stage are respectively –1/2, –1/4, and 0. Allometry in economy, biology, turbulence, astronomy, neural resistance, conductive textile, and macromolecule …