Preparation of Silk Fibroin Nanofibres by Needleless Electrospinning Using Formic Acid-Calcium Chloride as the Solvent

2016 ◽  
Vol 848 ◽  
pp. 203-206 ◽  
Author(s):  
Nongnut Sasithorn ◽  
Rattanaphol Mongkholrattanasit ◽  
Lenka Martinová
Keyword(s):  
Electron Microscope ◽  
Formic Acid ◽  
Calcium Chloride ◽  
Silk Fibroin ◽  
Weight Ratio ◽  
Electrospinning Process ◽  
Silk Fibre ◽  
Needleless Electrospinning ◽  
Spinning Process ◽  
Scanning Electron

In this study, silk nanofibre sheets were prepared by a needleless electrospinning from silk fibroin in a mixture of formic acid and calcium chloride. The influences of the concentration of calcium chloride on the properties of spinning solution, morphology of the silk electrospun fibres and the spinning performance of the spinning process were examined. The results show that calcium chloride can improve the solubility of silk fibroin in formic acid. The morphology of electrospun fibres was characterized by a scanning electron microscope (SEM), which indicates that the morphology of obtained fibres was influenced by the weight ratio of silk fibre to calcium chloride in the spinning solution. It was observed that the concentration of calcium chloride in the spinning solution influenced the diameter of the silk electrospun fibres, with an increase in the concentration of calcium chloride increasing the diameters of the electrospun fibres. The silk nanofibres had diameters ranging from 440 to 1900 nm. However, increasing the concentration of calcium chloride in the spinning solution had a less influence on the spinning performance of electrospinning process.

Needleless Electrospinning of Silk Fibroin/Gelatin Blend Nanofibres

2015 ◽  
Vol 804 ◽  
pp. 213-216
Author(s):  
Nongnut Sasithorn ◽  
Lenka Martinová
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silk Fibroin ◽  
Weight Ratio ◽  
Electrospun Fibre ◽  
Composition Ratio ◽  
Needleless Electrospinning ◽  
Electrospinning Method ◽  
Scanning Electron

In this study, nanofibres consisting of silk fibroin (SF) and gelatin (GP) with different composition ratio were fabricated by needleless electrospinning method. The influences of SF/GP blending ratio on the properties of spinning solution and the morphology of electrospun fibres were investigated. A variety of compositions of the silk fibroin/gelatin blend solutions were successfully electrospun into nanofibres sheet. The morphology of electrospun fibre was characterized by a scanning electron microscope (SEM) which indicates that the morphology of obtained fibres was influenced by the weight ratio of gelatin to silk fibroin in the spinning solution. It was observed that the blending ratio of gelatin to silk fibroin in spinning solution played an important role in spinning performance of the process and the diameter of obtained fibres. An increasing in gelatin content in blended solution resulted in bigger diameter of the obtained electrospun fibres. The silk fibroin/gelatin electrospun fibres had diameters ranging from 200 to 660 nm.

scholarly journals Fabrication of Silk Nanofibres with Needle and Roller Electrospinning Methods

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Nongnut Sasithorn ◽  
Lenka Martinová
Keyword(s):  
Formic Acid ◽  
Production Rate ◽  
Calcium Chloride ◽  
Silk Fibroin ◽  
Applied Voltage ◽  
Rotating Cylinder ◽  
Spinning Process

In this study, silk nanofibres were prepared by electrospinning from silk fibroin in a mixture of formic acid and calcium chloride. A needle and a rotating cylinder were used as fibre generators in the spinning process. The influences of the spinning electrode and spinning parameters (silk concentration and applied voltage) on the spinning process, morphology of the obtained fibres, and the production rate of the spinning process were examined. The concentration of the spinning solution influenced the diameter of the silk electrospun fibres, with an increase in the concentration increasing the diameters of the fibres in both spinning systems. The diameters of the electrospun fibres produced by roller electrospinning were greater than those produced by needle electrospinning. Moreover, increasing the concentration of the silk solution and the applied voltage in the spinning process improved the production rate in roller electrospinning but had less influence on the production rate in needle electrospinning.

scholarly journals Blended PVA/PVP Electro spun nanofibers for Coating Application

2021 ◽  
Vol 2114 (1) ◽  
pp. 012031
Author(s):  
R Mohammed ◽  
H Jawad ◽  
A. Al-Zubiedy
Keyword(s):  
Electrical Conductivity ◽  
Contact Angle ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Weight Ratio ◽  
Polymeric Materials ◽  
Vinyl Pyrrolidone ◽  
Pumping Rate ◽  
Coating Application ◽  
Scanning Electron

Abstract The use of polymeric blended nanofibres is one of the recent applications in the food and liquid packaging. The current research aims to prepare the nanofibers coatings from the blend of polymeric materials via the electro spinning technique 0.08 weight ratio concentration of polyvinyl alcohol (PVA) dissolved in water, as well as, (0.2 weight ratio concentration ) of poly vinyl pyrrolidone (PVP) were used to obtain different volume proportions of (PVA:PVP) solutions include (100:0, 80:20,70:30, 50:50, 20:80, and 0:100). The electro spinning system was organized with pumping conditions (20 kV for the applied voltage, 20 cm pumping distance, 1ml/hr pumping rate) and a needle diameter with 0.4mm diameter. The properties of the polymeric solutions involve (viscosity, surface tension, and electrical conductivity of the liquid) were examined. A scanning electron microscope technique was used to study the surface properties of the prepared films, and the contact angle via the contact angle analyzer was examined. The results of a scanning electron microscope proved that the diameter of the nano fibers increases with increasing the concentration and viscosity of solutions and decreasing its electrical conductivity. Also, the results of the contact angle analyzer showed an increase the hydrophilic property via increasing percentage of polyvinylpyrrolidone.

Attenuation and Absorption of Electromagnetic Waves of Nanocomposites (ZnFe2O3 / Graphene: UPE) by Wave Guide Technical

2021 ◽  
Vol 19 (4) ◽  
pp. 71-76
Author(s):  
M.A. Mohammed ◽  
Fadhil K. Farhan ◽  
I.K. Jassim ◽  
A. Sh. Mahmoud
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electromagnetic Waves ◽  
Weight Ratio ◽  
Microwave Frequencies ◽  
Nano Powder ◽  
Best Value ◽  
X Band ◽  
Ultrasound Technology ◽  
Scanning Electron

In this article, composites with a polymeric basis were prepared and developed with a ZnFe2O3 material dyed with graphene that has the ability to absorb and attenuate by a weight ratio of (1-4) % of the base. The samples were formed by chemical blending and ultrasound technology to homogenize the mixture. The waveguide technique was used at the microwave frequencies in the range of 8- 12 kHz and within the X-band range - the results showed a significant improvement in the absorbance and attenuation by increasing the percentage of the deformed material compared to the blank material, and the best value was obtained at 3%. The compositional examinations of the Nano powder were performed using a scanning electron microscope technology equipped with an EDX scan.

scholarly journals A belt-like superfine film fabricated by the bubble-electrospinning

2013 ◽  
Vol 17 (5) ◽  
pp. 1508-1510 ◽  
Author(s):  
Hao Dou ◽  
Hong-Yan Liu ◽  
Ping Wang ◽  
Ji-Huan He
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silk Fibroin ◽  
Average Width ◽  
Fibroin Solution ◽  
Font Color ◽  
Scanning Electron

A belt-like superfine film is prepared via the bubble-electrospinning from an aqueous silk fibroin solution. The morphology of film structures is characterized by the scanning electron microscope. The average width of the film is about one micrometer and the thickness is about 377 nanometers. <br><br><font color='red'><b>This article has been retracted. Link to the retraction <u><a href='http://dx.doi.org/10.2298/TSCI150120012E'>10.2298/TSCI150120012E</a><u></b></font>

Preparing and Sphericizing Ultrafine Graphite Particles with Stirred Mill

2014 ◽  
Vol 539 ◽  
pp. 785-789
Author(s):  
Ling Yan Zhang ◽  
Yang Shuai Qiu ◽  
Wei Hong ◽  
Cheng Cai Deng
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Weight Ratio ◽  
Raw Material ◽  
Graphite Particles ◽  
Study Results ◽  
Conditional Tests ◽  
Operation Parameters ◽  
Scanning Electron ◽  
Main Operation

The ultrafine graphite particles was prepared and sphericized by stirred mill. By the conditional tests, the influences of the main operation parameters, such as ball-to-powder weight ratio, grinding concentration, dispersant dosage, agitator speed on grinding efficiencies of stirred mill were studied systematically .The reasons of the influence was analyzed. The study results offered suitable operation parameters for practical production. The scanning electron microscope (SEM) was employed to investigate the structure of the ore sample. The result showed the sphericity of product was improved than the raw material.

Anti-Friction Effect of Graphite Nonasheets Formed by Sonicating Expanded Graphite

2012 ◽  
Vol 189 ◽  
pp. 210-213
Author(s):  
Zhi Guo Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Liquid Medium ◽  
Weight Ratio ◽  
Expanded Graphite ◽  
Optimum Conditions ◽  
Base Oil ◽  
Graphite Nanosheets ◽  
Friction Effect ◽  
Scanning Electron

Graphite nanosheets were prepared by sonicating expanded graphite (EG) in a liquid medium. The products were characterized by scanning electron microscope (SEM), and its anti-friction effect used as additive of base oil was investigated. The influencing factors of its anti-friction effect, the weight ratio of graphite nanosheets to base oil, the sonicating medium and sonicating time, were studied and optimized. The results show that under the optimum conditions the graphite nanosheets exhibit an excellent anti-friction effect.

scholarly journals Thermal and Microstructure Analysis of Cocofoam Made from Blended Coconut Fiber with Latex Compound

CORD ◽  
2013 ◽  
Vol 29 (1) ◽  
pp. 9
Author(s):  
I.D.K. Anom
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Room Temperature ◽  
Weight Ratio ◽  
Sem Analysis ◽  
Microstructure Analysis ◽  
Coconut Fiber ◽  
Scanning Calorimetry ◽  
Scanning Electron

Thermal and microstructure analysis of cocofoam made from vulcanized coconut fiber and latex compound were conducted. The cocofoam was produced by blending coconut fiber and latex compound with weight ratio of 10/25 (CF5-1) and 20/55 (CF5-2) at room temperature. The cocofoam characters were then analyzed by Scanning Electron Microscope (SEM), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DTA) instruments. The result showed that the increase of coconut fiber and latex compound ratio produced a higher density of cocofoam. The highest value density was 0.6920 g/cm3 with flexibility of 90% produced by the CF5-2 sample. The SEM analysis showed that both specimens surface of the CF5-1 and CF5-2 samples have different pores size and the latex compound is not distributed thoroughly in the cocofoam. The thermal analysis showed that the production of cocofoam was largely determined by latex compound that served as fiber binder matrix. Cocofoam started to degrade at the temperature of 90oC and was damaged when it was heated at the temperature of 115oC for 2.5 hours.

scholarly journals Inclusion complexes of β-cyclodextrine with Fe3O4@HA@Ag Part I:Preparation and characterization

2019 ◽  
Vol 70 (03) ◽  
pp. 255-258 ◽  
Author(s):  
RIZA ATAV ◽  
AYLIN YILDIZ ◽  
DERMAN VATANSEVER BAYRAMOL ◽  
AHMET ÖZGÜR AĞIRGAN
Keyword(s):  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Inclusion Complexes ◽  
Electrospinning Process ◽  
Mass Ratio ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Study Results ◽  
Physical Mixing ◽  
Mixing Techniques ◽  
Scanning Electron

n this study, the preparation of inclusion complexes according to kneading and physical mixing techniques at 1:1 and 1:2 (guest:host) mass ratios of Fe 3 O 4 @HA@Ag and β-cyclodextrin were studied. Fourier transformed infrared spectroscopy, thermogravimetric analyses and scanning electron microscope analysesof the prepared complexes were carried out. According to the results obtained, it was observed Fe 3 O 4 @HA@Ag especially forms inclusion complex with β-cyclodextrin at a mass ratio of 1:2. In the second part of this study, results related to the use of these inclusion complexes during electrospinning process in order to obtain antibacterial nanowebs, which could potentially be used in medical wounds, will be given.

Effect of Process Parameters on Poly(butylene adipate co-terephthalate) Nanofibers Development by Electrospinning Technique

2014 ◽  
Vol 894 ◽  
pp. 360-363 ◽  
Author(s):  
J. Prasanna ◽  
T. Monisha ◽  
V. Ranjithabala ◽  
Ravikant Gupta ◽  
E. Vijayakumar ◽  
...  
Keyword(s):  
Experimental Study ◽  
Electron Microscope ◽  
Experimental Design ◽  
Scanning Electron Microscope ◽  
Process Parameters ◽  
Fiber Diameter ◽  
Electrospinning Process ◽  
Electrospinning Technique ◽  
Optimal Setting ◽  
Scanning Electron

Electrospinning process is proved to be one of the finest fabrication techniques to produce nanofibers. This research deals with the experimental study on the effect of various process parameters of electrospinning technique such as voltage, flow rate, distance (nozzle to collector distance) and concentration, on the development of nanofibers from a new polymer, namely PBAT. Taguchis experimental design was implemented to carry out this research by conducting an L-18 orthogonal array. Taguchi method and Analysis of Variance (ANOVA) were employed to examine the effect of different process parameters simultaneously on the fabrication of nanofibers. The fibers were characterized through scanning electron microscope (SEM) for the measurement of its diameter. The experimental results indicate that all the chosen process parameters had significant influence on the fiber diameter. It was inferred that the concentration and voltage had a very notable impact on the fiber diameter. Confirmation experimental run was performed on the identified optimal setting of the process parameters.

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