centrifugal spinning
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2022 ◽  
Vol 934 ◽  
Author(s):  
S. Noroozi ◽  
W. Arne ◽  
R.G. Larson ◽  
S.M. Taghavi

The centrifugal spinning method is a recently invented technique to extrude polymer melts/solutions into ultra-fine nanofibres. Here, we present a superior integrated string-based mathematical model, to quantify the nanofibre fabrication performance in the centrifugal spinning process. Our model enables us to analyse the critical flow parameters covering an extensive range, by incorporating the angular momentum equations, the Giesekus viscoelastic constitutive model, the air-to-fibre drag effects and the energy equation into the string model equations. Using the model, we can analyse the dynamic behaviour of polymer melt/solution jets through the dimensionless flow parameters, namely, the Rossby ( $Rb$ ), Reynolds ( $Re$ ), Weissenberg ( $Wi$ ), Weber ( $We$ ), Froude ( $Fr$ ), air Péclet ( $Pe^*$ ) and air Reynolds ( $Re^*$ ) numbers as well as the viscosity ratio ( $\delta _s$ ), corresponding to rotational, inertial, viscous, viscoelastic, surface tension, gravitational, air thermal diffusivity, aerodynamic and viscosity ratio effects. We find that the nonlinear rheology remarkably affects the fibre trajectory, radius and normal stresses. Increasing $Wi$ leads to a thicker fibre, whereas increasing $\delta _s$ shows an opposite trend. In addition, by increasing $Wi$ , the fibre curvature is enhanced, causing the fibre to spiral closer to the rotation centre.


2021 ◽  
Author(s):  
Luo wei ◽  
Mei Shunqi ◽  
Liu Teng ◽  
Yang Liye ◽  
Fan Lingling

Abstract Flexible conductive thin films have recently become a research area of focus in both academia and industry. In this study, a method of preparing nanofiber conductive films by centrifugal spinning is proposed. Polyurethane (PU) nanofiber films were prepared by centrifugal spinning as the flexible substrate film, and carbon nanotubes (CNTs) were used as the conducting medium, to obtain CNTs/PU nanofiber conductive films with good conductivity and elasticity. The effects of different CNT concentrations on the properties of the nanofiber films were investigated. It was found that the conductivity of the nanofiber conductive films was optimal when an impregnation concentration of 9% CNTs was used in the stretching process. Cyclic tensile resistance tests showed that the nanofiber conductive films have good durability and repeatability. Physical and structural property analysis of the CNT/PU conductive films indicate that the adsorption of the CNTs on the PU surface was successful and the CNTs were evenly dispersed on the surface of the matrix. Moreover, the CNTs improved the thermal stability of the PU membrane. The CNT/PU conductive films were pasted onto a human finger joint, wrist joint, and Adam's apple to test the detection of movement. The results showed that finger bending, wrist bending, and laryngeal prominence movement all caused a change in resistance of the conductive film, with an approximately linear curve. The results indicate that the CNT/PU nanofiber conductive film developed in this study can be used to test the motion of human joints.


Author(s):  
Seyed Shahaboddin Ayati ◽  
Mehdi Karevan ◽  
Evan Stefanek ◽  
Mohammed Bhia ◽  
Mohsen Akbari
Keyword(s):  

2021 ◽  
Author(s):  
Sooran Noroozi ◽  
Hossein Hassanzadehkolarikola ◽  
Walter Arne ◽  
Ronald G Larson ◽  
Seyed Mohammad Taghavi
Keyword(s):  

2021 ◽  
Vol 68 (1) ◽  
Author(s):  
Marco Laurence M. Budlayan ◽  
Jonathan N. Patricio ◽  
Jeanne Phyre Lagare-Oracion ◽  
Susan D. Arco ◽  
Arnold C. Alguno ◽  
...  

AbstractA straightforward approach to recycle waste expanded polystyrene (EPS) foam to produce polystyrene (PS) microfibers using the improvised centrifugal spinning technique is demonstrated in this work. A typical benchtop centrifuge was improvised and used as a centrifugal spinning device. The obtained PS microfibers were characterized for their potential application for oil adsorption. Fourier transform infrared spectroscopy results revealed similarity on the transmission bands of EPS foam and PS microfibers suggesting the preservation of the EPS foam’s chemical composition after the centrifugal spinning process. Scanning electron microscopy displayed well-defined fibers with an average diameter of 3.14 ± 0.59 μm. At the same time, energy dispersive X-ray spectroscopy revealed the presence of carbon and oxygen as the primary components of the fibers. Contact angle (θCA) measurements showed the more enhanced hydrophobicity of the PS microfiber (θCA = 100.2 ± 1.3°) compared to the untreated EPS foam (θCA = 92.9 ± 3.5°). The PS microfiber also displayed better oleophilicity compared to EPS foam. Finally, the fabricated PS microfibers demonstrated promising potential for oil removal in water with a calculated sorption capacity value of about 15.5 g/g even at a very short contact time. The fabricated PS fiber from the waste EPS foam may provide valuable insights into the valorization of polymeric waste materials for environmental and other related applications.


Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5916
Author(s):  
Xiaotian Yu ◽  
Xian Zhang ◽  
Yajie Xing ◽  
Hongjing Zhang ◽  
Wuwei Jiang ◽  
...  

A new type of Janus cellulose acetate (CA) fiber membrane was used to separate oil–water emulsions, which was prepared with plasma gas phase grafting by polymerizing octamethylcyclotetrasiloxane (D4) onto a CA fiber membrane prepared by centrifugal spinning. The Janus–CA fiber membrane was described in terms of chemical structure using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) analysis, energy dispersive X-ray spectroscopy (EDX) analysis and morphology by field emission scanning electron microscopy (FESEM). In this contribution, we examine the influence of spinning solution concentration, spinning speed and nozzle aperture on the centrifugal spinning process and the fiber morphology. Superhydrophobic/hydrophilic Janus–CA fiber membrane was used to separate water and 1,2-dibromoethane mixture and Toluene-in-water emulsion. Unidirectional water transfer Janus–CA fiber membrane was used to separate n-hexane and water mixture. The separation for the first-time interception rate was about 98.81%, 98.76% and 98.73%, respectively. Experimental results revealed that the Janus cellulose acetate (CA) fiber membrane gave a permeate flux of about 43.32, 331.72 and 275.27 L/(m2·h), respectively. The novel Janus–CA fiber membrane can potentially be used for sustainable W/O emulsion separation. We believe that this is a facile strategy for construction of filtration materials for practical oil–water separation.


2021 ◽  
Vol 28 ◽  
pp. 100790
Author(s):  
J. Ayala ◽  
D. Ramirez ◽  
E. Fletes ◽  
H. Morales ◽  
J.G. Parsons ◽  
...  

Author(s):  
MEIARUL RAJENDRAN

We were all living in the world of technology, where the science had been developing for each and every seconds such as new technologies, new inventions and new ideas. In which, we would like to introduce a new idea by using centrifugal spinning method. Where, it is has been recently used for the production of micro and nano-fibers and it is also a safer and more efficient method for producing micro and nano-fibers when compared to all the fibers production method. Our concept is to reduce the manufacturing cost of the centrifugal spinning machine. Because the manufacturing cost of the single machine in India is about Rs.2.5 to 3 lakhs, by the way we would like to produce a machine at a low cost and by using the machine we produce the mat which has the same efficiency as compared to the mat produced by the original machine.


Author(s):  
Luděk Hromádko ◽  
Martin Motola ◽  
Veronika Čičmancová ◽  
Roman Bulánek ◽  
Jan M. Macak

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