Polycaprolactone Fiber Bundles Prepared by Self-Bundling Electrospinning

2012 ◽  
Vol 622-623 ◽  
pp. 271-275 ◽  
Author(s):  
Patcharaporn Thitiwongsawet ◽  
Tanwa Tiyajalearn ◽  
Aumnart Klinchan ◽  
Chaninporn Thanatthammachote
Keyword(s):  
Electrical Conductivity ◽  
Fiber Diameter ◽  
Average Diameter ◽  
Electrospinning Process ◽  
Fiber Bundles ◽  
Electrospun Fibers ◽  
Average Fiber Diameter ◽  
Electrospinning Technique

Polycaprolactone (PCL) fiber bundles were successfully prepared by self-bundling electrospinning technique from two different concentrations (i.e. 12% and 15% w/v) of PCL solution. Self-bundling of electrospun fibers was induced by used of a grounded needle tip at the beginning of electrospinning process. Electrical conductivity of PCL solutions were increased and average fiber diameter were decreased by addition and increasing amount of pyridinium formate (PF) at concentration of 3, 4, and 5% w/v into either 12% or 15% w/v PCL solutions. The average diameter of electrospun fibers and bundles were in range of 2.1-3.3 m and 100-120 m, respectively.

scholarly journals Designing Multifunctional Protective PVC Electrospun Fibers with Tunable Properties

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2086
Author(s):  
Pedro J. Rivero ◽  
Iker Rosagaray ◽  
Juan P. Fuertes ◽  
José F. Palacio ◽  
Rafael J. Rodríguez
Keyword(s):  
Fiber Diameter ◽  
Electrospinning Process ◽  
Operating Parameters ◽  
Electrospun Fibers ◽  
Polymeric Precursor ◽  
Operational Parameters ◽  
Electrospinning Technique ◽  
Coating Morphology ◽  
Hydrophobic Nature ◽  
First Time

In this work, the electrospinning technique is used for the fabrication of electrospun functional fibers with desired properties in order to show a superhydrophobic behavior. With the aim to obtain a coating with the best properties, a design of experiments (DoE) has been performed by controlling several inputs operating parameters, such as applied voltage, flow rate, and precursor polymeric concentration. In this work, the reference substrate to be coated is the aluminum alloy (60661T6), whereas the polymeric precursor is the polyvinyl chloride (PVC) which presents an intrinsic hydrophobic nature. Finally, in order to evaluate the coating morphology for the better performance, the following parameters—such as fiber diameter, surface roughness (Ra, Rq), optical properties, corrosion behavior, and wettability—have been deeply analyzed. To sum up, this is the first time that DoE has been used for the optimization of superhydrophobic or anticorrosive surfaces by using PVC precursor for the prediction of an adequate surface morphology as a function of the input operational parameters derived from electrospinning process with the aim to validate better performance.

OPTIMIZATION OF ELECTROSPINNING PROCESS PARAMETERS FOR TISSUE ENGINEERING SCAFFOLDS

2006 ◽  
Vol 01 (02) ◽  
pp. 153-178 ◽  
Author(s):  
MING CHEN ◽  
PRABIR K. PATRA ◽  
STEVEN B. WARNER ◽  
SANKHA BHOWMICK
Keyword(s):  
Cell Growth ◽  
Process Parameters ◽  
Growth Kinetics ◽  
Fiber Diameter ◽  
Average Diameter ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Average Fiber Diameter ◽  
High Concentration ◽  
Cell Growth Kinetics

The goal of the current study was to optimize important process parameters for electrospinning polycaprolactone (PCL) for growing 3T3 fibroblasts. We hypothesized that the smallest obtainable fiber diameter would provide the best cell growth kinetics and we tested this hypothesis for three different process parameters: solution concentration, voltage and collector screen distance. Beaded structures were formed when using low concentration electrospinning solutions (8 wt% to 13 wt%), in which the viscosity ranged from 16.0 c P to 340.0 c P . In this concentration range, cell growth kinetics was impeded when using a high concentration of cells (8–10 × 105). Higher PCL concentration led to an increase in the average fiber diameter from 400 nm to 1600 nm when PCL solution concentration changed from 15 wt% to 20 wt%. Although, the mean values indicated that cell growth kinetics were higher at the lower end of the concentration (15% as opposed to 20%) and this correlated with lower average fiber diameter, the results in this range were not statistically significant (p > 0.05). The average fiber diameter of scaffolds first decreased and then increased when electrospinning voltage was increased. The cell growth kinetics demonstrated that smaller average diameter PCL fiber scaffolds had higher growth kinetics than larger average diameter scaffolds with the best conditions obtained at 15 KV. By increasing the screen distance, the average fiber diameter decreased but had no significant impact on cell growth kinetics. In summary, the optimal parametric space for 3T3 fibroblast growth for our studies was electrospinning a 15 wt% PCL solution using 15 kV voltage and a 25 cm collector distance.

Fabrication and Characterization of Polycaprolactone (PCL)/Gelatin Electrospun Fibers

2014 ◽  
Vol 554 ◽  
pp. 52-56 ◽  
Author(s):  
Mim Mim Lim ◽  
Naznin Sultana ◽  
Azli Bin Yahya
Keyword(s):  
Fiber Diameter ◽  
Electrospun Fiber ◽  
Weight Ratio ◽  
Processing Parameters ◽  
Electrospun Fibers ◽  
Average Fiber Diameter ◽  
Polymer Blending ◽  
Electrospinning Technique ◽  
Sem Image

Over the past few decades, there has been considerable interest in developing electrospun fibers by using electrospinning technique for various applications. Polymer blending is one of the most effective methods in providing desired properties. In this study, synthetic polymer polycaprolactone (PCL) was blended together with natural polymer gelatin where both of them have different properties. It is done by using electrospinning technique. 10 %w/v and 14 %w/v PCL/gelatin electrospun fibers were successfully electrospun with different weight ratio. Processing parameters were set constant in this study and only solution parameters were altered. The optimized electrospun fiber formed was 14 %w/v PCL/gelatin 70:30 with average fiber diameter of 246.30 nm. No beaded fiber was formed in this scanning electron microscope (SEM) image. The result obtained also showed that by increasing the overall polymeric concentration of PCL/gelatin, average fiber diameter decreases. Fiber diameter was also found decreasing with the increase of the concentration of gelatin in the same concentratoin of PCL/gelatin blended electrospun fiber. Blending of PCL and gelatin in different weight ratio had provided different properties of electrospun fibers. It is believed that blended electrospun fibers can be used for biomedical applications.

scholarly journals Electrospun Nylon-6 Nanofibers and Their Characteristics

2020 ◽  
Vol 9 (1) ◽  
pp. 9-19
Author(s):  
Ida Sriyanti ◽  
Meily P Agustini ◽  
Jaidan Jauhari ◽  
Sukemi Sukemi ◽  
Zainuddin Nawawi
Keyword(s):  
Fiber Diameter ◽  
Peak Shift ◽  
Nylon 6 ◽  
Electrospinning Process ◽  
Electrospinning Technique ◽  
Fiber Concentration ◽  
Air Filters ◽  
Xrd Pattern ◽  
Electrospinning Method ◽  
Small Wave

The purposes of this research were to investigate the synthesized Nylon-6 nanofibers using electrospinning technique and their characteristics. The method used in this study was an experimental method with a quantitative approach. Nylon-6 nanofibers have been produced using the electrospinning method. This fiber was made with different concentrations, i.e. 20% w/w (FN1), 25% w/w (FN2), and 30% w/w (FN3). The SEM results show that the morphology of all nylon-6 nanofibers) forms perfect fibers without bead fiber. Increasing fiber concentration from 20% w/w to 30% w/w results in bigger morphology and fiber diameter. The dimensions of the FN1, FN2, and FN3 fibers are 1890 nm, 2350 nm, and 2420 nm, respectively. The results of FTIR analysis showed that the increase in the concentration of nylon-6 (b) and the electrospinning process caused a peak shift in the amide II group (CH2 bond), the carbonyl group and the CH2 stretching of the amide III group from small wave numbers to larger ones. The results of XRD characterization showed that the electrospinning process affected the changes in the XRD pattern of nylon-6 nanofiber (FN1, FN2, and FN3) in the state of semi crystal. Nylon-6 nanofibers can be used for applications in medicine, air filters, and electrode for capacitors

Electrospinning of Regenerated Silk Fibroin/Polybutylene Terephthalate Blended Mats and their Surface Wettability

2012 ◽  
Vol 531-532 ◽  
pp. 531-534
Author(s):  
Yun Qian Cao ◽  
Qin Fei Ke ◽  
Xiang Yu Jin ◽  
Sha Sha Guo
Keyword(s):  
Silk Fibroin ◽  
Fiber Diameter ◽  
Contact Angles ◽  
Surface Wettability ◽  
Electrospun Fibers ◽  
Average Fiber Diameter ◽  
Polybutylene Terephthalate ◽  
Regenerated Silk Fibroin ◽  
Electrospinning Method ◽  
Nanofiber Membranes

In this paper, regenerated silk fibroin/polybutylene terephthalate blended mats were prepared using electrospinning method with different blending ratios. The influence of regenerated silk fibroin/polybutylene terephthalate ratio on the morphology behaviors, fiber diameter and the surface wettability of the blended mats were studied. The morphology of the electrospun fibers were characterized by SEM. The average fiber diameter and its distribution can be obtained from the SEM pictures using software Image J. The average fiber diameter was 280nm to 486nm and it changed with the blending ratio. The contact angles and penetration times were used to characterize the surface wettability of the nanofiber membranes. It was found that with the increase of regenerated silk fibroin amount, the surface contact angles and penetration times decreased, which meant that the wettability was greatly improved.

Mechanical and Thermal Characteristics of Optimized Electrospun Nylon 6,6 Nanofibers by Using Taguchi Method

NANO ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. 1950139
Author(s):  
Saleh S. Abdelhady ◽  
Said H. Zoalfakar ◽  
M. A. Agwa ◽  
Ashraf A. Ali
Keyword(s):  
Fiber Diameter ◽  
Thermal Characteristics ◽  
Electrospun Nanofibers ◽  
Processing Parameters ◽  
Statistical Technique ◽  
Electrospinning Process ◽  
Diameter Distribution ◽  
Solvent Ratio ◽  
Average Fiber Diameter ◽  
Nylon 6,6

This study is an attempt to optimize the electrospinning process to produce minimum Nylon 6,6 nanofibers by using Taguchi statistical technique. Nylon 6,6 solutions were prepared in a mixture of formic acid (FA) and Dichloromethane (DCM). Design of experiment by using Taguchi statistical technique was applied to determine the most important processing parameters influence on average fiber diameter of Nylon 6,6 nanofiber produced by electrospinning process. The effects of solvent/nylon and FA/DCM ratio on average fiber diameter were investigated. Optimal electrospinning conditions were determined by using the signal-to-noise (S/N) ratio that was calculated from the electrospun Nylon 6,6 nanofibers diameters according to “the-smaller-the-better” approach. The optimum Nylon 6,6 concentration (NY%) and FA/DCM ratio were determined. The morphology of electrospun nanofibers is significantly altered by FA/DCM solvent ratio as well as Nylon 6,6 concentration. The smallest diameter and the narrowest diameter distribution of Nylon 6,6 nanofibers ([Formula: see text][Formula: see text]nm) were obtained for 10 wt% Nylon 6,6 solution in 80 wt% FA and 20 wt% DCM. An increase of 118%, 280% and 26% in tensile strength, modulus of elasticity and elongation at break over as-cast was obtained, respectively. Glass transition temperature of Nylon 6,6 nanofibers were determined by using differential scanning calorimeter (DSC). Analysis of variance ANOVA shows that NY% is the most influential parameter.

Electrospinning of polyaniline-polyacrylonitrile blend nanofibers

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Fatemeh Raeesi ◽  
Mahdi Nouri ◽  
Akbar Khodaparast Haghi
Keyword(s):  
Electrical Conductivity ◽  
Electric Fields ◽  
Fiber Diameter ◽  
Average Diameter ◽  
Fibrous Structure ◽  
Emeraldine Base ◽  
Image Analyzer ◽  
Scanning Electronic Microscopy ◽  
Composition Ratios ◽  
Pan Fibers

AbstractElectrospinning of emeraldine base polyaniline/polyacrylonitrile (PANI/PAN) blends with different composition ratios were performed using Nmethyl- 2-pyrrolidone (NMP) as solvent. The blends were electrospun at various electrospinning temperature and electric fields. Morphology and fibers diameters were investigated by scanning electronic microscopy (SEM). The average diameter of nanofibers and their distributions were determined from 100 measurements of the random fibers with image analyzer software (manual microstructure distance measurement). Electrical conductivity of the prepared mats was characterized using standard four point probe method. The fibers with diameter ranging from 60 to 600 nm were obtained. The PANI/PAN blends containing up to the PANI content of 30% could be electrospun into the continuous fibrous structure, although pure PANI solution was not able to be electrospun into the fibrous structure. Average of fiber diameter decreased with increasing PANI content and electrospinning temperature. The electrospun PANI/PAN fibers at 50 °C and 75 °C showed smaller diameters with much better uniformity than those electrospun at 25 °C. The electrical conductivity of the mats increased with the increase of PANI content in the blend with percolation threshold of 0.5%.

Electrospun Gelatin Fiber Bundles by Self-Bundling Electrospinning

2015 ◽  
Vol 1105 ◽  
pp. 190-194 ◽  
Author(s):  
Patcharaporn Thitiwongsawet ◽  
Boonchuay Wisesanupong ◽  
Supatcharee Pukkanasut
Keyword(s):  
Electrical Conductivity ◽  
Acetic Acid ◽  
Solvent Mixture ◽  
Electrospinning Process ◽  
Single Fiber ◽  
Fiber Bundles ◽  
Electrospun Gelatin

Electrospun gelatin fiber bundles were successfully prepared by self-bundling electrospinning process. A solvent mixture of 80:20 v/v acetic acid: N,N-dimethylacetamide was used as solvent for gelatin. Self-bundling was achieved by using of a grounded needle tip at the beginning of electrospinning process. Gelatin fiber bundles were fabricated from 30% w/v gelatin solutions with addition of pyridinium formate (PF) at concentrations of 3 and 5% w/v. The averaged diameters of single fiber were 452 and 410 nm, respectively; whereas, the averaged diameter of bundles were 17.2 and 22.3 μm, respectively. Viscosity and electrical conductivity of solutions were important parameters for achieving self-bundling electrospinning. Gelatin solutions with optimum electrical conductivity and viscosity could yield bundles by self-bundling electrospinning.

Electrospinning of poly-L-lactide nanofibers on liquid reservoir collectors

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Thorsten Röcker ◽  
Andreas Greiner
Keyword(s):  
Electrical Conductivity ◽  
Sodium Chloride ◽  
Linear Correlation ◽  
Strong Influence ◽  
Fiber Diameter ◽  
Electrospinning Process ◽  
Distilled Water ◽  
Chloride Solutions ◽  
Sodium Chloride Solutions ◽  
Non Linear

AbstractThe electrospinning process of Poly-L-lactide (PLA) solutions using liquid reservoir collectors was studied. As collector liquids, distilled water and sodium chloride solutions of different concentrations were used. A new, non-linear correlation of the fiber diameter and the filling of the collector was found. It was also proved, that the electrical conductivity of the substrate has a strong influence on the electrospinning process and the nanofibers obtained therein, both in diameter and in morphology

Fabrication of Nanofibers via Crater-Like Electrospinning

2011 ◽  
Vol 332-334 ◽  
pp. 1257-1260 ◽  
Author(s):  
Yuan Yuan Wang ◽  
Yong Liu ◽  
Wei Liang ◽  
Ming Ma ◽  
Rui Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fiber Diameter ◽  
Average Diameter ◽  
Diameter Distribution ◽  
Excellent Performance ◽  
Electrospinning Technique ◽  
Multiple Jets ◽  
Medical Materials ◽  
Scanning Electron

Nanofibers, with its excellent performance, have played a significant role in the fields of filtration materials, medical materials, biomaterials, etc. In this work, a novel electrospinning technique, carter-like electrospinning, was presented and used to produce nanofibers. Multiple jets, which have the potential to increase the yield of nanofibers, were found in our experiments. The geometric properties, such as fiber diameter, diameter distribution, and surface morphology of the produced Nanofibers via this process, were characterized using a field emission scanning electron microscopy (FESEM). The results showed that the diameters of nanofibers ranged from several nanometers to one micron, and the nanofibers had average diameter of 84-550nm.

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