An Investigation onto the Importance of Dimensionless Analysis in the Modeling of Electrospinning

2016 ◽  
Vol 5 (1) ◽  
pp. 12-23
Author(s):  
Shima Maghsoodlou ◽  
Sulmaz Poreskandar
Keyword(s):  
Electrospinning Process ◽  
Electrospun Nanofiber ◽  
Jet Formation ◽  
Dimensionless Analysis ◽  
Important Challenge

Nowadays, electrospinning has emerged as a widespread technology to produce nanofibers and best candidates for many significant applications. The most important challenge is to attain uniform nanofibers. In these cases, controlling the production of electrospun nanofiber becomes important. However, Analysis dynamics of jet formation and its instability is difficult during the process. For making more suitable nanofibers, one should control the electrospinning process and its instability. For achieving this aim, the most desirable way of controlling them are using dimensionless analysis and modeling electrospinning process. The main objective of this article is using the dimensionless analysis in the modeling of the electrospinning process to better understand.

Controlling Electrospinning Jet Using Microscopic Model for Ideal Tissue Engineering Scaffolds

2016 ◽  
Vol 5 (2) ◽  
pp. 1-16
Author(s):  
Shima Maghsoodlou ◽  
Sulmaz Poreskandar
Keyword(s):  
Tissue Engineering ◽  
Dynamic Analysis ◽  
Computer Simulations ◽  
Electrospinning Process ◽  
Spring Model ◽  
Electrospun Nanofiber ◽  
Jet Formation ◽  
Tissue Engineering Scaffolds ◽  
Jet Behavior ◽  
Important Challenge

Electrospinning has recently emerged as a widespread technology to produce synthetic nanofibrous and the best candidates for many important applications like scaffolds in tissue engineering. Creating porosity is the primary challenge of tissue engineering scaffolds. But, the most important challenge is to create uniform nanofibers. For these reasons, controlling producing of electrospun nanofiber becomes important. The most suitable method for controlling instability is using modeling and computer simulations. The dynamic analysis of the jet formation and its instability is difficult during the process. In this study, the behavior of the electrospinning process has been investigated by using bead-spring model to see the process in detail. Simulation of this model showed the jet behavior from the first second to the end by bringing in one bead step by step. Therefore, by increasing the number of beads, the behavior of jet during whipping part was obviously expressed.

Multispinneret Methodologies for High Throughput Electrospun Nanofiber

2002 ◽  
Vol 752 ◽  
Author(s):  
Jeremy Bowman ◽  
Malcolm Taylor ◽  
Vikram Sharma ◽  
Anne Lynch ◽  
Suneet Chadha
Keyword(s):  
High Throughput ◽  
Pilot Scale ◽  
Electrospinning Process ◽  
Electrospun Nanofiber ◽  
Wide Range ◽  
Nanofiber Membranes ◽  
Commercial Applications

ABSTRACTThe overall objective of the Electrospinning program at Foster-Miller is to develop a semi-automated, pilot scale machinery capable of producing nanofiber membranes at reasonable scales so that they can be evaluated for a wide range of military and commercial applications. This paper discusses the development of a high throughput electrospinning process

scholarly journals Electrospinning of Polymeric Nanofibers: Analysis of Jet Formation

2000 ◽  
Vol 661 ◽  
Author(s):  
Antonio E. Senador ◽  
Montgomery T. Shaw ◽  
Patrick T. Mather
Keyword(s):  
Electrospinning Process ◽  
Polymer Fibers ◽  
Critical Voltage ◽  
Jet Formation ◽  
Polymeric Fibers ◽  
Optical Components ◽  
Nanofiber Diameter ◽  
Dimensionless Groups ◽  
Wide Range ◽  
Polymeric Nanofibers

ABSTRACTProducing nanofiber-diameter polymeric fibers presents an attractive and robust approach toward the processing of nanocomposites, with applications ranging from clear optical components to toughened structural materials. In this work, we are examining the electrospinning process for the production of nanometer-diameter polymer fibers, giving particular attention to the following key features: jet-initiation, fiber architecture, and fiber distribution. A wide range of polymer systems and polymer-solvent combinations were studied in order to broaden the applicability of our conclusions to other systems. Specifically, a dimensional analysis was applied to jet-formation data obtained by quantifying the conditions required for the expulsion of fibers from a charged capillary to a grounded collection plate. The relationships between various dimensionless groups were compared with the expressions for the critical voltage that have been proposed for electrospinning of polymer solutions.

scholarly journals Preparation and Characterization of Levofloxacin-Loaded Nanofibers as Potential Wound Dressings

2017 ◽  
Vol 63 (2) ◽  
pp. 66-69 ◽  
Author(s):  
Noémi Pásztor ◽  
Emőke Rédai ◽  
Zoltán-István Szabó ◽  
Emese Sipos
Keyword(s):  
Electron Microscopy ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Wound Dressings ◽  
Dissolution Testing ◽  
Electrospun Nanofiber ◽  
Scanning Calorimetry ◽  
Rapid Release ◽  
Scanning Electron

Abstract Objective: The study aimed at obtaining and characterizing levofloxacin-loaded, poly(ε-caprolactone) electrospun nanofiber formulations to be used as antibacterial wound dressings. Methods: Drug-loaded nanofibers were obtained by the electrospinning process and their morphology was determined using scanning electron microscopy. Structural analysis of the prepared nanofibers was carried out using differential scanning calorimetry and dissolution testing was performed in order to determine drug release. Results: Both nanofiberous formulations (containing 20 % and 50 % w/w levofloxacin) showed dimensions in the range of few hundred nanometers. Thermograms indicated that the formulation containing 20% levofloxacin was totally amorphized, showing a rapid release of the active, in 20 minutes. Conclusions: The poly(ε-caprolactone)-based electrospun nanofibers, containing levofloxacin presented suitable characteristics for obtaining potential antibacterial wound dressings.

Model development and validation of electrospun jet formation

2018 ◽  
Vol 89 (11) ◽  
pp. 2177-2186 ◽  
Author(s):  
Yuansheng Zheng ◽  
Binjie Xin ◽  
Masha Li
Keyword(s):  
High Speed ◽  
Volume Fraction ◽  
Model Development ◽  
Electrospinning Process ◽  
Taylor Cone ◽  
Jet Formation ◽  
Velocity Magnitude ◽  
Key Factor ◽  
Simulation Results ◽  
Development And Validation

The Taylor cone formed at the tip of the syringe used for delivering the solution plays an important role in jet formation. This study presents a novel multiphysics model to simulate the dynamic processes occurring within the cone jet from a flat spinneret and a single needle spinneret. The electric field, volume fraction and velocity magnitude of the polymer jet ejecting from two different kinds of spinnerets are calculated by the multiphysics simulation model. A high-speed camera is employed to capture the jet formed by the Taylor cone. The simulation results are validated by comparison with experimental results. It is found that the spinneret configuration could be the key factor in determining cone morphology in the electrospinning process.

Effects of temperature on melt electrospinning with auxiliary heating: experiment and simulation study

2021 ◽  
pp. 004051752110582
Author(s):  
Cheng Ge ◽  
Yuansheng Zheng ◽  
Kai Liu ◽  
Binjie Xin
Keyword(s):  
High Speed ◽  
Heating Temperature ◽  
Good Deal ◽  
Electrospinning Process ◽  
Experimental Results ◽  
High Speed Photography ◽  
Auxiliary Heating ◽  
Jet Formation ◽  
Finite Element Software ◽  
Melt Electrospinning

In this study, the effect of the heating temperature of the spinneret on the melt electrospinning process under the condition of application of auxiliary heating was investigated, in a systematical and comprehensive way. The temperature distribution of the melt jet during the melt electrospinning process was simulated by finite element software in order to provide a good deal of insight into the experimental results. In addition, high-speed photography was adopted to capture images of jet formation and jet motion during the melt electrospinning process. The experimental results indicated that the cooling rate of the polypropylene jet decreases obviously under the condition of auxiliary heating; in addition, the higher spinneret temperature leads to greater drafting force, a drawing fiber drafting rate, and greater jet whipping motion, which is conducive to secondary drawing and refinement of the jet.

In situ extracted poly(acrylic acid) contributing to electrospun nanofiber separators with precisely tuned pore structures for ultra-stable lithium–sulfur batteries

2019 ◽  
Vol 7 (7) ◽  
pp. 3253-3263 ◽  
Author(s):  
Xiaobo Zhu ◽  
Yue Ouyang ◽  
Jiawei Chen ◽  
Xinguo Zhu ◽  
Xiang Luo ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Electrospinning Process ◽  
Electrospun Nanofiber ◽  
Pore Structures ◽  
Lithium Sulfur Batteries ◽  
Composite Nanofiber ◽  
Lithium Sulfur ◽  
Poly Acrylic Acid

A negatively charged polyacrylonitrile/poly(acrylic acid) composite nanofiber separator with precisely tuned pore structures was prepared by a simple electrospinning process combined with ethanol steaming treatment for Li–S batteries.

scholarly journals Electrospun Nanofibers Embedding ZnO/Ag2CO3/Ag2O Heterojunction Photocatalyst with Enhanced Photocatalytic Activity

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 565 ◽  
Author(s):  
Nurafiqah Rosman ◽  
Wan Norharyati Wan Salleh ◽  
Farhana Aziz ◽  
Ahmad Fauzi Ismail ◽  
Zawati Harun ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Polyvinylidene Fluoride ◽  
Uv Light ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Physical Interaction ◽  
Electrospun Nanofiber ◽  
Dye Pollutants ◽  
Photocatalytic Application ◽  
Excellent Photocatalytic Activity

The immobilization of photocatalyst onto substrate has a great potential for energy-intensive separation to avoid the costly separation process and unwanted release of photocatalyst into the treated water. In this study, electrospun nanofiber composed of polyvinylidene fluoride (PVDF) with the immobilized ZnO, ZnO/Ag2CO3, ZnO/Ag2CO3/Ag2O, and ZnO/Ag2O photocatalysts were prepared via the electrospinning process. The immobilized ZnO and heterojunctioned ZnO in the PVDF electrospun nanofiber were proven via X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The electrospinning allowed high chemical binding of the nanofiber composite with good physical interaction between the photocatalyst and the electrospun nanofiber. AFM images obtained for the nanofibers were found to be rougher than that of the pristine PVDF electrospun nanofiber. Among the photocatalyst embedded, the immobilized ZnO/Ag2CO3/Ag2O had endowed the nanofiber with an excellent photocatalytic activity and recyclability for the degradation of the RR120 under UV light irradiation. Based on the results, effective immobilization of ZnO/Ag2CO3/Ag2O in PVDF nanofiber with 99.62% photodegradation in 300 min compared to PVDF-ZnO, PVDF-ZnO/Ag2CO3, and PVDF-ZnO/Ag2O of 28.14%, 90.49%, and 96.34%, respectively. The effective ZnO/Ag2CO3/Ag2O immobilization into polymers with affinity toward organic dye pollutants could both increase the efficiency and reduce the energy requirements for water treatment via the photocatalytic application.

scholarly journals Conductive Electrospun Nanofiber Mats

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 152 ◽  
Author(s):  
Tomasz Blachowicz ◽  
Andrea Ehrmann
Keyword(s):  
Conductive Polymers ◽  
Conductive Polymer ◽  
Electrospinning Process ◽  
Electrospun Nanofiber ◽  
Conductive Coatings ◽  
Molecular Weights ◽  
Calcination Step ◽  
Recent Developments ◽  
Broad Variety ◽  
Nanofiber Mats

Conductive nanofiber mats can be used in a broad variety of applications, such as electromagnetic shielding, sensors, multifunctional textile surfaces, organic photovoltaics, or biomedicine. While nanofibers or nanofiber from pure or blended polymers can in many cases unambiguously be prepared by electrospinning, creating conductive nanofibers is often more challenging. Integration of conductive nano-fillers often needs a calcination step to evaporate the non-conductive polymer matrix which is necessary for the electrospinning process, while conductive polymers have often relatively low molecular weights and are hard to dissolve in common solvents, both factors impeding spinning them solely and making a spinning agent necessary. On the other hand, conductive coatings may disturb the desired porous structure and possibly cause problems with biocompatibility or other necessary properties of the original nanofiber mats. Here we give an overview of the most recent developments in the growing field of conductive electrospun nanofiber mats, based on electrospinning blends of spinning agents with conductive polymers or nanoparticles, alternatively applying conductive coatings, and the possible applications of such conductive electrospun nanofiber mats.

scholarly journals Investigation of the Fiber, Bulk, and Surface Properties of Meltblown and Electrospun Polymeric Fabrics

2004 ◽  
Vol os-13 (3) ◽  
pp. 1558925004os-13
Author(s):  
Peter P. Tsai ◽  
WeiWei Chen ◽  
J. Reece Roth
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fiber Diameter ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Microscopic Structure ◽  
Electrospun Nanofiber ◽  
Sem Images ◽  
Nylon Fabric ◽  
Scanning Electron

We measured and compared the properties of meltblown and electrospun fabrics made of nylon and polyurethane (PU). Properties of interest included surface energy/wettability, strength, fiber diameter, and microscopic structure as revealed by scanning electron microscopy (SEM). We also report new data on the diameters of electrospun fibers measured from digitized SEM images of electrospun nylon, polyurethane (PU), polyacrylonitrile (PAN), polycaprolactone (PCL), and polycarbonate (PC) fabrics. The electrospinning process produced fibers with diameters in the range from 10 nm to several microns. It was found that the strength per unit areal weight of electrospun nanofiber nylon fabric was up to ten times that of the meltblown material, and for polyurethane (PU) fabric, from 2.5–3 times that of the melt-blown material.

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