scholarly journals Research on morphologies of polyvinyl alcohol/milk nanofibers

2016 ◽  
Vol 20 (3) ◽  
pp. 961-966
Author(s):  
Yan Zhang ◽  
Chuan-Zheng Zhang ◽  
Fu-Juan Liu ◽  
Fei-Yan Wang ◽  
Ping Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polyvinyl Alcohol ◽  
Polyvinyl Acetate ◽  
Electrospinning Process ◽  
Diameter Distribution ◽  
Electrospinning Technique ◽  
Weight Percentage ◽  
Surface Morphologies ◽  
Scanning Electron

In this paper, the surface morphologies of polyvinyl alcohol/milk nanofibers produced via electrospinning technique were investigated. The electrospinning process was performed at various processing parameters (flow rate, applied voltage) and different polyvinyl acetate to milk ratios (100/0, 90/10, 80/20, 70/30, and 60/40). The scanning electron microscopy and Image J software were used to characterize the surface morphologies, especially the diameter distribution of electro spun nanofibers. The results of scanning electron microscopy show that the diameter of polyvinyl acetate/milk nanofibers increases with the increase of the spinning speed and spinning voltage but decreases with the increase of the weight percentage of milk in the spinning solution. The potential applications of this bicomponent nanofibers are numerous and diverse. The research results in present paper can contribute to better control of the electrospinning process and thus expanding the applicabilities, such as dressings for wound healing in sports.

scholarly journals ТЕХНОЛОГІЯ ОДЕРЖАННЯ УЛЬТРАТОНКИХ НЕТКАНИХ МАТЕРІАЛІВ НА ОСНОВІ ПОЛІМЕРНИХ КОМПОЗИЦІЙ З ХІТОЗАНОМ

2021 ◽  
Vol 148 (4) ◽  
pp. 107-116
Author(s):  
О. В. Іщенко ◽  
В. П. Плаван ◽  
І. О. Ляшок ◽  
Т. В. Шевчук ◽  
З. С. Патрихіна
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Scanning Electron Microscopy ◽  
Surface Tension ◽  
Polyvinyl Alcohol ◽  
Polyvinyl Acetate ◽  
Polymer Composition ◽  
Nonwoven Materials ◽  
Scanning Electron ◽  
Acetic Acids

The  aim  of  the  scientific  work  is  to  develop  a  technology  for  obtaining  of  ultrafine nonwoven  materials  based  on  a  polymer  composition  of  polyvinyl  alcohol  and  polyvinyl  acetate  with  the addition of chitosan, which was dissolved in lactic and acetic acids. Methodology. To assess the characteristics of the compositions, the viscosity and surface tension of working solutions were determined by capillary viscometry, and electrical conductivity - by conductometric method.  The  effect  of  thermal  stabilization  of  materials  based  on  chitosan  was  investigated  using  their sorption  properties.  The  morphological  composition  of  nonwovens  was  investigated  by  the  method  of scanning electron microscopy. Findings.  A  technology  has  been  developed  for  the  obtaining  of  ultrafine  materials  based  on chitosan dissolved in lactic and acetic acids by the method of electrospinning. The parameters for obtaining fibers from the studied compositions were determined. As a result of the analysis of the obtained ultrafine nonwoven  materials  by  the  method  of  scanning  electron  microscopy,  it  was  found  that  with  a  voltage between  the  electrodes  of  30  kV,  fibers  with  a  diameter  of  0.3  to  0.9  μm  are obtained.  According  to the statistical distribution of the diameters of polymer fibers in ultrafine nonwoven materials, it was determined that, depending on the components of the composition, 72-77% of the fibers have a diameter of 0.3 μm. Originality.  The  scientific  novelty  of  the  work  lies  in  the  determination  of  the  basic  laws  of  the electrospinning process using the natural polymer of chitosan and the peculiarities of the preparation of its solutions  in  lactic  and  acetic  acids.  The  effect  of  viscosity,  surface  tension  and  electrical  conductivity  of working solutions of the compositions on the process of electrospinning has been established. Practical value. Technological parameters for the obtaining of ultrafine nonwoven materials based on  the  composition  of  polyvinyl  alcohol  and  polyvinyl  acetate  with  the  addition  of  chitosan  have  been developed by the method of electrospinning; the possibility of adjusting the fiber diameter by choosing a chitosan solvent has been determined.

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.

scholarly journals Effect on honey concentration on morphology of bubble-electrospun polyvinyl alcohol/honey fibers

2016 ◽  
Vol 20 (3) ◽  
pp. 1012-1013 ◽  
Author(s):  
Chang Liu ◽  
Lan Xu ◽  
Fujuan Liu ◽  
Ji-Huan He
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polyvinyl Alcohol ◽  
Mean Diameter ◽  
The Mean ◽  
Surface Morphologies ◽  
Scanning Electron

In this study, polyvinyl alcohol fibers containing honey were produced by bubble electrospinning. The surface morphologies of polyvinyl alcohol fibers were studied by a scanning electron microscopy. The results showed the mean diameter of fibers increased as the ratio of honey increased.

The Formation and Morphology of PVA Ferrogel Nanofibre by the Electrospinning Process

2010 ◽  
Vol 650 ◽  
pp. 361-366 ◽  
Author(s):  
Tao Yu Wan ◽  
Mohammad Chowdhury ◽  
George K. Stylios
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Polyvinyl Alcohol ◽  
Flow Rate ◽  
Electrospinning Process ◽  
Magnetic Sensors ◽  
Solution Flow Rate ◽  
Solution Flow ◽  
Fiber Mats ◽  
Scanning Electron

Aqueous solutions of polyvinyl alcohol (PVA) with FeCl3 were homogenously mixed and subsequently electrospun; and its characteristics were studied as a function of voltage, tip-target distance and solution flow rate. Fiber mats of (PVA)/FeCl3 composite, in the diameter of 700–1100 nm were prepared by electrospinning. Lower concentrations of solution tended to facilitate the formation of fibres with beads. With increasing concentration, the morphology was improved with smooth and uniform fibres and the increased fibre diameters in the nano range. Spinning voltage also had an important influence on the diameters of the nano fibres, while the collection distance affected fibre diameters. Nano fibres of smaller diameter were formed when lower voltages are applied. The morphology of the electrospun from PVA/FeCl3 nano fibres and their magnetic power was observed and analyzed by scanning electron microscopy (SEM).The fibres produced in this way could potentially be applied to manufacture magnetic sensors, flexible magnets.

scholarly journals Fabrication of Drug-Loaded Starch-based Nanofibers via Electrospinning Technique

2020 ◽  
Vol 11 (3) ◽  
pp. 10801-10811
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Poly Vinyl Alcohol ◽  
Loading Capacity ◽  
Sago Starch ◽  
Electrospinning Technique ◽  
Blending Process ◽  
Operation Parameters ◽  
Optimized Conditions ◽  
Scanning Electron

This paper reported the fabrication of starch-based nanofibers derived from various weight ratios (w:w) of native sago starch (SS) and poly (vinyl alcohol) (PVA) (0:100, 1:100, 3:100, and 5:100) using the electrospinning technique. The effects of electrospinning operation parameters on the surface morphology of SS/PVA nanofibers were observed by using Scanning Electron Microscopy (SEM). The smooth and bead-free SS/PVA nanofibers with fiber diameters within the range of 90 nm to 150 nm were produced under the optimized conditions. The paracetamol (PCM) was encapsulated into the SS/PVA nanofibers via the blending process. The SS/PVA nanofibers exhibited a maximum PCM loading capacity of 0.9573 mg.mg-1, and PCM was observed to release out from SS/PVA nanofibers slowly and steadily for 72 hours.

scholarly journals N-halamine antibacterial nanofibrous mats based on polyacrylonitrile and N-halamine for protective face masks

2019 ◽  
Vol 14 ◽  
pp. 155892501984322 ◽  
Author(s):  
Chengbo Huang ◽  
Ying Liu ◽  
Zhiguang Li ◽  
Rong Li ◽  
Xuehong Ren ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Escherichia Coli ◽  
Scanning Electron Microscopy ◽  
Air Permeability ◽  
Escherichia Coli O157 ◽  
Electrospinning Technique ◽  
Antibacterial Materials ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Biocidal Properties ◽  
Scanning Electron

The main objective of this study was to develop antibacterial materials based on polyacrylonitrile for potential application in protective face masks to combat airborne pathogens. To achieve biocidal properties, 1-chloro-2, 2, 5, 5-tetramethyl-4-imidazolidinone as a kind of N-halamine was introduced into the polyacrylonitrile nanofibers by an electrospinning technique to form nanofibers by an electrospinning technique to form polyacrylonitrile/1-chloro-2, 2, 5, 5-tetramethyl-4-imidazolidinone-5% nanofibers. Scanning electron microscopy and Fourier transformed infrared spectroscopy were employed to characterize the structure of nanofibers. The antimicrobial efficacies of electrospinning nanofibers with 1-chloro-2, 2, 5, 5-tetramethyl-4-imidazolidinone against both Staphylococcus aureus and Escherichia coli O157:H7 were evaluated at different contact times. The antimicrobial efficacies against bioaerosol of S. aureus were also performed. The polyacrylonitrile/1-chloro-2, 2, 5, 5-tetramethyl-4-imidazolidinone-5% nanofibers possess excellent antimicrobial efficacies against bacteria bioaersol, and it has good air permeability.

New route for development of electromagnetic shielding based on cellulosic nanofibers

2016 ◽  
Vol 46 (8) ◽  
pp. 1598-1615 ◽  
Author(s):  
M Gouda ◽  
AA Hebeish ◽  
AI Aljaafari
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Metal Nanoparticles ◽  
Electromagnetic Interference ◽  
Carboxymethyl Cellulose ◽  
Electrospinning Technique ◽  
Zinc Nanoparticles ◽  
Nanofiber Mats ◽  
Microscopy Images ◽  
Scanning Electron

A radically new innovation was established for development of electromagnetic interference shielding. The innovation emphasis synthesis of carboxymethyl cellulose (CMC), carboxymethyl cellulose composite containing different metal nanoparticles (CMC-MNPs), and carboxymethyl cellulose nanofiber mat (CMC-NF) and carboxymethyl cellulose containing metal nanofiber mat (CMC-MNPs nanofiber mat) by electrospinning technique. Metal nanoparticles used include copper nanoparticles, iron nanoparticles, zinc nanoparticles, cadmium nanoparticles, and cobalt nanoparticles. Synthesized CMC–MNPs were characterized by using scanning electron microscopy coupled with high-energy dispersive X-ray and UV–visible spectroscopy that was used for confirmation of nanoparticles formation. The scanning electron microscopy images clearly showed regular flat shape with semiporous surface. All metal nanoparticles were well distributed inside the backbone of the cellulose without aggregation. The average particle diameter was 29–39 nm for zinc nanoparticles, 29–33 nm for cadmium nanoparticles, 25–33 nm for cobalt nanoparticles, 23–27 nm for copper nanoparticles, and 22–26 nm for iron nanoparticles. Electrospun carboxymethyl cellulose and CMC–MNPs nanofiber mats were synthesized by electrospinning technique and characterized using scanning electron microscopy, energy dispersive X-ray, and transmission electron microscopy. Scanning electron microscopy images of electrospun carboxymethyl cellulose and CMC–MNPs nanofibers reveal smooth and uniformly distributed nanofibers without bead formation with average fiber diameters in the range of 300–450 nm. Moreover, the diameters of electrospun carboxymethyl cellulose nanofiber mat were not affected by the presence of metal nanoparticles. Metal nanoparticles’ content inside the electrospun CMC–MNPs nanofibers was investigated by using atomic absorption spectroscopy. Electromagnetic interference shielding of electrospun carboxymethyl cellulose and CMC–MNPs nanofiber mats was evaluated. Data showed that the EMI-SE was increased in presence of metal nanoparticles and depending on both the metal nanoparticle contents and the electrical conductivity of metal nanoparticles.

Natural weather ageing of starch/polyvinyl alcohol blend: effect of glycerol content

2013 ◽  
Vol 33 (3) ◽  
pp. 257-263 ◽  
Author(s):  
Sreekumar Parambathmadhom Appu ◽  
Sadhan Kumar De ◽  
Massihullah J. Khan ◽  
Mamdouh A. Al-Harthi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrogen Bonding ◽  
Polyvinyl Alcohol ◽  
Weather Conditions ◽  
Intermolecular Hydrogen Bonding ◽  
Biodegradable Material ◽  
Glycerol Content ◽  
Fourier Transfer Infrared Spectroscopy ◽  
Scanning Electron

Abstract Starch plasticized with glycerol and blended with polyvinyl alcohol (PVA) is recommended for use as a biodegradable material. The present article reports the results of studies of the natural weather ageing of starch/PVA blends having various amounts of glycerol in natural weather conditions of Saudi Arabia, with special reference to morphology and thermal behavior. Neat PVA has been used as a control to understand its behavior in its blend with starch. Differential scanning calorimeter studies indicated that an increase in the exposure time of samples to natural environment increases the crystallinity of PVA due to the breakage of intermolecular hydrogen bonding, thus facilitating the removal of the amorphous portion of the polymers in the blend. Thermogravimetric analysis revealed that an increase in glycerol content enhanced the degradation of the polymer, which is corroborated with the findings from the surface morphology using scanning electron microscopy and Fourier transfer infrared spectroscopy analyses.

Preparation of Polyurethane (PU)/ Polyaniline (PANI) Compound Nanofiber via Electrospinning

2011 ◽  
Vol 332-334 ◽  
pp. 1352-1356
Author(s):  
Li Wei Liu ◽  
Wei Min Kang ◽  
Bo Wen Cheng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electrospun Nanofibers ◽  
Total Solid ◽  
Solution Concentration ◽  
Solid Content ◽  
Diameter Distribution ◽  
Mass Ratio ◽  
Total Solid Content ◽  
Scanning Electron

In this paper polyurethane (PU) / polyaniline (PANI) nanofibers were successfully prepared via electrospinning with N, N-dimethylformamide (DMF) and tetrahydrofuran (THF) mixture (1:2 mass ratio). The morphology, diameter and structure of the electrospun nanofibers were examined by scanning electron microscopy (SEM) and the diameter distribution of nanofibers was measured by Image-Pro Plus. Results indicate that the morphology, diameter and uniformity of the fibers were influenced by solution concentration, applied voltage, capillary–screen distance and flow rate greatly, and the finer and uniform nanofibers were electrospun from total solid content of the spinning solutions at 8 wt. %, PU and PANI with ratio of 10/1 (w/w), the spinning voltage at 35 kV, the collecting distance at 15 cm and the extruding speed at 6 ml/h.

Preparation and Photoluminescent Properties of Polystyrene Encapsulated SrAl2O4:Eu2+,Dy3+ Nanocrystals

2013 ◽  
Vol 538 ◽  
pp. 197-200 ◽  
Author(s):  
Bao Gai Zhai ◽  
Yuan Ming Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Properties ◽  
Phase Morphology ◽  
X Ray ◽  
Weight Percentage ◽  
Deep Blue ◽  
The Matrix ◽  
Pl Spectrum ◽  
Scanning Electron

Polystyrene encapsulated phosphors SrAl2O4:Eu2+,Dy3+ were prepared by dispersing the phosphors into the matrix of polystyrene. The phase, morphology and optical properties of the polystyrene encapsulated phosphors were characterized with X-ray diffractometry, scanning electron microscopy and photoluminescence (PL) spectroscopy, respectively. It has been observed that both the PL spectrum and the luminescent color of the polystyrene encapsulated phosphors can be dramatically modified although the phosphorescence of the polystyrene encapsulated phosphors is not affected. Tunable photoluminescent colors from green to deep-blue are expected for the polystyrene encapsulated phosphors by the control of the weight percentage of the phosphors in the composites.

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