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.

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.

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 A Belt-Like Superfine Film Fabricated by Bubble-Electrospinning

2013 ◽  
Vol 843 ◽  
pp. 82-85
Author(s):  
Hao Dou ◽  
Bao Qi Zuo
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silk Fibroin ◽  
Average Width ◽  
Silk Fibroin Film ◽  
Fibroin Solution ◽  
Scanning Electron

A belt-like superfine silk fibroin film was prepared via bubble-electrospinning from aqueous silk fibroin solution at concentration 15%. The morphology of film structures were characterized by scanning electron microscope (SEM). The average width was 1.17 micronmeters and the thickness was 377 nanometers.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

The Broad Applications of the Scanning Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 20-21
Author(s):  
C. T. Nightingale ◽  
S. E. Summers ◽  
T. P. Turnbull
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscopy ◽  
Surface Topography ◽  
Great Depth ◽  
Resolving Power ◽  
Depth Of Field ◽  
Pictorial Representations ◽  
Scanning Electron

The ease of operation of the scanning electron microscope has insured its wide application in medicine and industry. The micrographs are pictorial representations of surface topography obtained directly from the specimen. The need to replicate is eliminated. The great depth of field and the high resolving power provide far more information than light microscopy.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

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