scholarly journals A comprehensive study on electrospinning of poly (vinyl alcohol): effects of the TCD, applied voltage, flow rate and solution concentration

2020 ◽  
pp. 609-616
Author(s):  
Gokhan ACİK
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Vinyl Alcohol ◽  
Solution Concentration ◽  
Poly Vinyl Alcohol ◽  
Alcohol Effects ◽  
Comprehensive Study

Coaxial nanofibers from poly(caprolactone)/ poly(vinyl alcohol)/Thyme and their antibacterial properties

2016 ◽  
Vol 47 (5) ◽  
pp. 834-852 ◽  
Author(s):  
Pantea Koushki ◽  
S Hajir Bahrami ◽  
Marziyeh Ranjbar-Mohammadi
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Vinyl Alcohol ◽  
Polymer Concentration ◽  
Antibacterial Properties ◽  
Poly Vinyl Alcohol ◽  
Core Shell ◽  
Operational Parameters ◽  
The Core ◽  
Poly Caprolactone

Today, with substantial global demand from patients suffering from wounds and burns, the wound care sector has gained great deal of interest in medical industry. Herein, coaxial electrospun poly(caprolactone)/poly(vinyl alcohol) core–shell nanofibers incorporated with Thyme extract in the core structure were prepared using coaxial electrospinning, and the effect of various operational parameters such as polymer concentration, applied voltage, flow rate, distance, and Thyme concentration on nanofiber diameter were studied. Physical and mechanical properties of the nanofibers were determined by analytical techniques. The results revealed that desired nanofibers with uniform surface morphology and acceptable tensile strength could be obtained at applied voltage of 15 kV, needle tip-target of 13 cm, core flow rate of 0.2 mL/h, and shell flow rate of l mL/h. Moreover, MTT assay shows that the nanofibers are highly biocompatible regardless of Thyme encapsulation. Antibacterial activities of the prepared core–shell nanofibers were also examined against two bacteria—gram-positive Staphylococcus and gram-negative Escherichia. Encapsulation of 5% (w/v) Thyme extract concentration in the core–shell poly(caprolactone)/poly(vinyl alcohol) nanofibers led to high antibacterial activity of the produced nanofibers.

Research on Electrospinning Process of Pullulan Nanofibers

2012 ◽  
Vol 268-270 ◽  
pp. 198-201 ◽  
Author(s):  
Xiao Bin Sun ◽  
D. Jia ◽  
Wei Min Kang ◽  
Bo Wen Cheng ◽  
Ya Bin Li
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Great Influence ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Diameter Distribution ◽  
Optimal Parameters ◽  
Redistilled Water ◽  
Water As Solvent

A kind of pullulan biopolymer nanofibers with diameter of 100～700nm were obtained using redistilled water as solvent through electrospinning technology in this paper. The effects of the spinning solution concentration, applied voltage, flow rate and capillary–screen distance on morphology and diameter distribution of pullulan nanofiber were studied by SEM. The results show that, different parameters had great influence on nanofibers’ morphology and diameter. The optimal parameters of pullulan nanofibers electrospinning were: 22wt.% spinning solution concentration, 31 kV voltage, 20 cm capillary–screen distance and 0.5ml/h flow rate.

Fabricating high mechanical strength γ-Fe2O3 nanoparticles filled poly(vinyl alcohol) nanofiber using electrospinning process potentially for tissue engineering scaffold

2016 ◽  
Vol 32 (4) ◽  
pp. 411-428 ◽  
Author(s):  
Nor Hasrul Akhmal Ngadiman ◽  
Noordin Mohd Yusof ◽  
Ani Idris ◽  
Denni Kurniawan ◽  
Ehsan Fallahiarezoudar
Keyword(s):  
Tissue Engineering ◽  
Mechanical Strength ◽  
Young’S Modulus ◽  
Flow Rate ◽  
Vinyl Alcohol ◽  
Young's Modulus ◽  
Electrospinning Process ◽  
Poly Vinyl Alcohol ◽  
Tissue Engineering Scaffolds ◽  
Rotating Speed

The use of electrospinning has gained substantial interest in the development of tissue engineering scaffolds due to its ability to produce nanoscale fibers which can mimic the geometry of extracellular tissues. Besides geometry, mechanical property is one of the main elements to be considered when developing tissue engineering scaffolds. In this study, the electrospinning process parameter settings were varied in order to find the optimum setting which can produce electrospun nanofibrous mats with good mechanical properties. Maghemite (γ-Fe2O3) was mixed with poly(vinyl alcohol) and then electrospun to form nanofibers. The five input variable factors involved were nanoparticles content, voltage, flow rate, spinning distance, and rotating speed, while the response variable considered was Young’s modulus. The performance of electrospinning process was systematically screened and optimized using response surface methodology. This work truly demonstrated the sequential nature of designed experimentation. Additionally, the application of various designs of experiment techniques and concepts was also demonstrated. Results revealed that electrospun nanofibrous mats with maximum Young’s modulus (273.51 MPa) was obtained at optimum input settings: 9 v/v% nanoparticle content, 35 kV voltage, 2 mL/h volume flow rate, 8 cm spinning distance, and 3539 r/min of rotating speed. The model was verified successfully by performing confirmation experiments. The nanofibers characterization demonstrated that the nanoparticles were well dispersed inside the nanofibers, and it also showed that the presence of defects on the nanofibers can decrease their mechanical strength. The biocompatibility performance was also evaluated and it was proven that the presence of γ-Fe2O3 enhanced the cell viability and cell growth rate. The developed poly(vinyl alcohol)/γ-Fe2O3 electrospun nanofiber mat has a good potential for tissue engineering scaffolds.

scholarly journals Effects of Electrospinning Voltage and Flow Rate on Morphology of Poly-vinyl Alcohol Nanofibers

2019 ◽  
Vol 1372 ◽  
pp. 012035
Author(s):  
Amnah Asiri ◽  
Rania Hussien Al-Ashwal ◽  
Mohd Helmi Sani ◽  
Syafiqah Saidin
Keyword(s):  
Flow Rate ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

scholarly journals Effect of parameters on the morphology and fibre diameters of edible electrospun chitosan-cellulose acetate-gelatin hybrid nanofibres

2018 ◽  
Vol 192 ◽  
pp. 03038
Author(s):  
Jaruayporn Somsap ◽  
Kobsak Kanjanapongkul ◽  
Racha Tepsorn
Keyword(s):  
Cellulose Acetate ◽  
Flow Rate ◽  
Applied Voltage ◽  
Acetic Acid Solution ◽  
Volume Ratio ◽  
Solution Concentration ◽  
Processing Parameters ◽  
Gelatin Solution ◽  
Electrospun Nanofibres ◽  
Scanning Electron

Electrospinning is the favorite process to fabricate fibres with diameter in the range nanoscale through the action of electric field. In this study, 3-7% chitosan, 18.0% cellulose acetate and 30.0% gelatin solution in aqueous 80% acetic acid solution were blended at the volume ratio of 4:1:5 have been successfully electrospun. The effect of processing parameters and the concentration of the polymer solution on the morphology and diameter of electrospun were investigated. The morphology and diameter of electrospun fibres were observed by scanning electron microscope. The diameters of chitosan-cellulose acetate-gelatin nanofibres ranging from 78.94 to 421.05 nm. The results showed that the fibre diameters increased when the solution concentration and flow rate were increased, whereas the fibre diameters decreased when the applied voltage and distance between tip to collector were increased. The conditions of the solution concentration 18.8 %wt, applied voltage at 23 kV, flow rate at 11.67 μL/min and collector distance at 10 cm were selected to prepares the desirable electrospun nanofibres for applications and the further research.

scholarly journals Effect of Electrospinning Parameters on the Fiber Diameter and Morphology of PLGA Nanofibers

2021 ◽  
pp. 1-7
Author(s):  
Yuanyuan Duan ◽  
Lohitha Kalluri ◽  
Megha Satpathy ◽  
Yuanyuan Duan
Keyword(s):  
Bone Regeneration ◽  
Flow Rate ◽  
Applied Voltage ◽  
Fiber Diameter ◽  
Solution Concentration ◽  
Electrospun Fibers ◽  
High Porosity ◽  
The Mean ◽  
Nanoscale Fibers ◽  
One Way Anova

Background: Poly lactic-co-glycolic acid (PLGA) has been widely investigated for various biomedical applications, such as craniofacial bone regeneration, wound dressing and tissue engineering. Electrospinning is a versatile technology used to produce micro/nanoscale fibers with large specific surface area and high porosity. Purpose: The aim of the current study is to prepare PLGA nanofibers using electrospinning for guided tissue regeneration/guided bone regeneration applications. The objective of this study is to determine the appropriate electrospinning parameters such as applied voltage, flow rate, spinneret-collector distance and polymer solution concentration for preparation of PLGA fibrous membrane and their effect on the mean fiber diameter of the electrospun fibers. Method: PLGA pellets were dissolved in Hexafluoroisopropanol (HFIP) in various concentrations overnight using a bench rocker. The resulting PLGA solution was then loaded into a syringe and electrospinning was done by maintaining the other parameters constant. Similarly, various fibrous mats were collected by altering the specific electrospinning parameter inputs such as applied voltage, flow rate and spinneret-collector distance. The morphology of the fibrous mats was characterized using Scanning Electron Microscope. The mean fiber diameter was assessed using ImageJ software and the results were compared using one-way ANOVA. Results: We obtained bead-free uniform fibers with various tested solution concentrations. One-way ANOVA analysis demonstrated significant variation in mean fiber diameter of the electrospun fibers with altering applied voltage, solution concentration, flow rate and spinneret-collector distance. Conclusion: The above-mentioned electrospinning parameters and solution concentration influence the mean fiber diameter of electrospun PLGA nanofibers.

Electrospinning of Polycaprolactone in Dichloromethane/Dimethylformamide Solvent System

2013 ◽  
Vol 849 ◽  
pp. 337-342 ◽  
Author(s):  
Narissara Kulpreechanan ◽  
Tanom Bunaprasert ◽  
Ratthapol Rangkupan
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Mixed Solvent ◽  
Solution Concentration ◽  
Solvent System ◽  
Fiber Formation ◽  
Solution Flow Rate ◽  
Fiber Morphology ◽  
Solution Flow ◽  
Fiber Size

Electrospinning of polycaprolactone (PCL) in a mixed solvent of dichloromethane (DCM)/dimethylformamide (DMF) with 1:1 volumetic mixing ratio was studied. The effects of solution concentration (5-30 %w/v), applied voltage (10-25 kV), solution flow rate (0.1-2.0 mL/h) and collecting distance (10, 20 cm) on fiber formation and morphology were investigated. The size of PCL fibers obtained were in the range of 10s nm-2.6 μm with either bead on string or smooth fiber morphology. In this study, the solution concentration strongly affected fiber size exponentially. The fiber size also increased with an increase in solution flow rate. The applied voltage and the collecting distance have no or minimal effect on PCL fiber size.

Improvement of Hydrophobic Properties of the Electrospun PVA Fabrics by SF6 Plasma Treatment

2008 ◽  
Vol 55-57 ◽  
pp. 625-628 ◽  
Author(s):  
A. Thongphud ◽  
Boonchoat Paosawatyanyong ◽  
P. Visal-athaphand ◽  
Pitt Supaphol
Keyword(s):  
Contact Angle ◽  
Plasma Treatment ◽  
Flow Rate ◽  
Inductively Coupled Plasma ◽  
Solution Concentration ◽  
Poly Vinyl Alcohol ◽  
Rf Power ◽  
Hydrophobic Properties ◽  
Inductively Coupled ◽  
Pva Solutions

Electrospun fabrics, prepared from 5, 7 and 10%w/v were Poly(vinyl alcohol) (PVA) solutions successfully prepared. The electrospinning condition was 15 kV, distance 15 cm, flow rate of 1 ml/hr and spinning time of 5 hours. Physical properties of electrospun PVA fabrics were analysed by SEM, FE-SEM and contact angle measurement.The contact angle of the electrospun PVA fabrics was 54.5°, characterizing the hydrophilicity of the fabrics. Hydrophobic properties of the electrospun PVA fabrics were improved by plasma treatment using radio frequency inductively coupled plasma (RF-ICP). RF-ICP plasma treatment of the electrospun PVA fabrics were carried out sulphurhexafluorene (SF6) gas with pressure of 0.5 Torr, RF power of 30W and treating time of 30, 60, 90 and 120 seconds. Effects of the PVA solution concentration and plasma treating time on hydrophobicity of the electrospun PVA fabrics were determined by contact angle that result of contact angle of treated fabrics increased when treated time increased and they decreased when concentration of fabrics increased.

Morphology of Biodegradable Poly(hexamethylene Adipate)(PHMA) Nanofibers Prepared by Electrospinning

2009 ◽  
Vol 87-88 ◽  
pp. 555-560
Author(s):  
Wei Min Kang ◽  
Bo Wen Cheng ◽  
Quan Xiang Li ◽  
Xu Pin Zhuang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Flow Rate ◽  
Applied Voltage ◽  
Mixed Solvent ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Solvent Ratio ◽  
Biodegradable Poly ◽  
Scanning Electron

A kind of novel biodegradable poly(hexamethylene adipate) (PHMA) nanofibers with diameter of 100～700nm using a mixed solvent of 1,2-dichloroethane (DCE ) and trifluoroacetic acid (TFA) were obtained by electrospinning process in this paper. The morphology of electropun PHMA nanofibers were investigated by scanning electron microscopy (SEM). The results showed that the morphology, diameter and uniformity of the fibers were influenced by solvent ratio, solution concentration, applied voltage, capillary–screen distance and flow rate greatly. The finer and uniform nanofibers were electrospun from a mixed solvent of DCE and TFA with ratio of 70/30(w/w).

An experimental study on the coaxial electrospinning of silk fibroin/poly(vinyl alcohol)–salicylic acid core-shell nanofibers and process optimization using response surface methodology

2017 ◽  
Vol 48 (5) ◽  
pp. 884-903 ◽  
Author(s):  
Nadia Rahimi Tanha ◽  
Mahdi Nouri
Keyword(s):  
Response Surface Methodology ◽  
Salicylic Acid ◽  
Electron Microscope ◽  
Response Surface ◽  
Release Rate ◽  
Vinyl Alcohol ◽  
Solution Concentration ◽  
Poly Vinyl Alcohol ◽  
Coaxial Electrospinning ◽  
Core Shell

Core-shell nanofiber of silk fibroin as shell and blend of salicylic acid/poly(vinyl alcohol) as core was fabricated successfully via coaxial electrospinning. Effects of concentration, viscosity, and electrical conductivity of the core and shell solutions on the final diameter of nanofibers and release behavior of salicylic acid were studied by viscometry, electrical conductometry, ultraviolet spectrophotometry, scanning electron microscope and transmission electron microscope methods. Response surface methodology was used to predict the relation between average fiber diameter as well as release rate of salicylic acid with core and shell concentrations. Direct relation between final nanofibers diameters and shell solution concentration was observed, while increase in core solution concentration was not significantly affected the final diameter of electrospun nanofibers. According to the results of release profiles, ratio of component in core and shell are effective parameters in rate and profile of salicylic acid release from these structures. Response surface methodology analysis indicates that the nanofibers diameters are more responsive to the changes in shell solution concentration and the release rate of salicylic acid is responsive to the changes in both shell and core solutions concentrations.

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