scholarly journals PLA – based electrospun structures

2019 ◽  
Vol 116 ◽  
pp. 00080
Author(s):  
Karolina Sobczyk ◽  
Maciej Borowczak ◽  
Karol Leluk
Keyword(s):  
Polymer Matrix ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Process Conditions

Polymer matrix (MATER-BI) electrospinning tests were carried out under various process conditions. Structures with a diversified morphology have been obtained. Changing the parameters of electrospinning process (mainly voltage and solution concentration) resulted in products with different morphology.

Experimental Investigation on the Multiple Jets from a Single Droplet by Electrospinning

2010 ◽  
Vol 129-131 ◽  
pp. 365-369 ◽  
Author(s):  
Cheng Kun Liu ◽  
Mei Yu Chen ◽  
Run Jun Sun ◽  
Wei Hua Zhang ◽  
Zhao Huan Zhang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Great Increase ◽  
Shape Change ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Process Conditions ◽  
Single Droplet ◽  
Interesting Phenomenon ◽  
Multiple Jets

In electrospinning, outlook of fibrous assembly changes not only with the variation of collecting setups, but with the electrospinning process. For example, formation of multiple jets on a single droplet at special electrospinning conditions can produce several regions of fibrous webs simultaneously, which is bound to bring a great increase of production of nanofibers. The initiation method of multiple jets during electrospinning was derived through an experimental investigation by means of a high-speed camera, which was used to obtain the information of the shape change of a droplet along with process conditions, such as solution concentration, voltage and flow rate. Results showed that multiple jets could be initiated in a controlled manner when droplets experienced several cycles of dripping at relatively high voltages and flow rates in a certain concentration range. An interesting phenomenon of the auto-initiation of double jets was further observed in our experiment.

Preparation of Chitosan based Nanofibers: Optimization and Modeling

2016 ◽  
Vol 14 (1) ◽  
pp. 283-288 ◽  
Author(s):  
K. Thirugnanasambandham ◽  
V. Sivakumar
Keyword(s):  
Polymer Solution ◽  
Response Surface ◽  
Applied Voltage ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Interactive Effects ◽  
Optimum Process ◽  
Process Conditions ◽  
Good Correspondence ◽  
Nanofiber Diameter

AbstractThe main objective of the present study is to prepare a chitosan based nanofiber and model the electrospinning process using response surface methodology (RSM). The electrospinning parameters such as collector distance, polymer solution concentration and applied voltage were optimized by using three-variable-three-level Box–Behnken design (BBD). Based on RSM analysis, second order polynomial equation was formed and it indicated good correspondence between experimental and predicted values. 3D response surface plots were used to study the individual and interactive effects of process variables on chitosan based nanofiber diameter. The optimum process conditions for the minimum chitosan based nanofiber diameter (0.3 µm) were found to be collector distance of 12 cm, polymer solution concentration of 25% and applied voltage of 6 kV.

Numerical Simulation of Viscous Jet for Near-Field Electrospinning

2009 ◽  
Vol 60-61 ◽  
pp. 465-469 ◽  
Author(s):  
Yuan Yuan Zhong ◽  
Gao Feng Zheng ◽  
Dao Heng Sun
Keyword(s):  
Numerical Simulation ◽  
Field Strength ◽  
Process Parameters ◽  
Near Field ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Substrate Distance ◽  
Viscous Jet ◽  
Set Up ◽  
The Impact

Near-Field Electrospinning (NFES) is a newly developed method to fabricate continuous and ordered solid nanofibers, with smaller spinneret-to-collector-distance the behavior of viscous jet would play a more prominent effect on the deposition and morphology of nanofiber. In this paper, a 2-dimentional physical model based on electrohydrodynamics and rheology was set up to discuss the morphology of viscous jet for NFES. The profile of the jet along z direction can be predicted by this model, and the impact of process parameters on the jet radius is analyzed. Radius of jet decreases with spinneret-to-substrate-distance decreasing; jet radius decreases with applied voltage and electric field strength increasing; jet electrospun from PEO solution is thinner than that from PVA solution with the same solution concentration; solution concentration has insignificant influence on the radius of jet from solution of the same polymer (PVA or PEO). This numerical simulation would improve the control of electrospinning process in NFES.

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.

scholarly journals An openwork like structures of polylactide – manufacturing and properties

2018 ◽  
Vol 44 ◽  
pp. 00165 ◽  
Author(s):  
Karolina Sobczyk ◽  
Karol Leluk
Keyword(s):  
Lactic Acid ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Weight Ratio ◽  
Electrospinning Process ◽  
Poly Lactic Acid ◽  
Process Conditions ◽  
Fiber Morphology

Poly(lactic acid) electrospinning tests were carried out under various process conditions. Openwork structures with a high surface area to weight ratio have been obtained. Changing the parameters of the PLA electrospinning process resulted in products with different fiber morphology.

Morphology Studies of Electrospun Lithium Iron Phosphate (LiFePO4)/Cellulose Acetate (CA) Fibers

2016 ◽  
Vol 694 ◽  
pp. 101-105
Author(s):  
M. Mohamad ◽  
M.F.Z. Abidin ◽  
Haslan Fadli Ahmad Marzuki ◽  
Abdullah Ahmad Nizam ◽  
Muhamad Hazri Othman ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Lithium Iron Phosphate ◽  
Mixed Solvent ◽  
Iron Phosphate ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Solution Viscosity ◽  
Pump Rate ◽  
Preliminary Study ◽  
Needle Diameter

This work was carried out as a preliminary study of electrospun LiFePO4/CA fibers. Cellulose acetate (CA) and LiFePO4 solutions were prepared separately using mixed solvent of acetone and water, prior to the electrospinning process. Then, electrospinning parameters including solution concentration, distance tip to collector, pump rate, and needle diameter size were optimized. Brunauer Emmett Teller (BET) was used to determine the surface area of CA fibers. Viscosity of CA solution was obtained by viscometer. LiFePO4/CA fibers were stabilized and carbonized at different temperature. The surface morphology and microstructure of the obtained LiFePO4/ CA fibers were then characterized using scanning electron microscope (SEM). In this work, it is shown that different electrospinning parameter, solution concentration and solution viscosity gives different fibers diameter and distribution. Moreover, the stabilization and carbonization temperature of LiFePO4/CA fibers may also affect the fibers microstructure.

Production of Silk Sericin Nanofibers

2011 ◽  
Vol 175-176 ◽  
pp. 348-352 ◽  
Author(s):  
Xian Hua Zhang ◽  
Masuhiro Tsukada ◽  
Yuji Satoh ◽  
Hideaki Morikawa
Keyword(s):  
Solution Concentration ◽  
Electrospinning Process ◽  
Optimum Concentration ◽  
Smooth Surfaces ◽  
Solution Properties ◽  
Process Variables ◽  
Silk Sericin ◽  
Syringe Needle ◽  
Inner Diameter ◽  
Working Distance

Electrospinning is a scientifically attractive spinning technique, since it can produce fibers with the diameters ranging from the sub-micron to nano dimensional scale. The fiber diameters and their standard deviation primarily depend on the polymer solution properties and electrospinning process variables. Silk sericin powder was obtained from the raw silk fiber of Bombyx mori silkworm. The solution was prepared by dissolving silk sericin powder in water at 85 °C for 30 minutes. In the electrospinning process, voltage 20 kV was applied and the inner diameter of the syringe needle was 0.3 mm. The distance from the syringe tip to the target was 15 cm. The sericin nanofibers with smooth surfaces can not be produced at 40 wt%. However, fine nanofibers were produced at the concentrations of 50 wt% and 60 wt%. It was suggested that the average diameters of the nanofibers increased with increasing solution concentration and the optimum concentration was 50 wt% for best nanofibers. Then solution 50 wt% was electrospun with different voltages from 13 kV to 25 kV, the working distance is 10 cm, the as-spun silk nanofibers were produced and exhibited fine nanofibers with smooth surfaces. The average diameters and diameter distributions of the nanofibers decreased with increasing voltage.

scholarly journals ПІДВИЩЕННЯ СТІЙКОСТІ ДЕТАЛЕЙ ПРОТИ ЗНОШУВАННЯ ДВИГУНІВ СІЛЬСЬКОГОСПОДАРСЬКОЇ ТЕХНІКИ

2014 ◽  
pp. 95-101
Author(s):  
Є. Я. Прасолов ◽  
Т. Г. Лапенко ◽  
О. Ю. Бондаренко
Keyword(s):  
Technological Process ◽  
Wear Surface ◽  
Manufacturing Process ◽  
Solution Concentration ◽  
Linear Velocity ◽  
Process Conditions ◽  
Control Points ◽  
Agricultural Machinery ◽  
Antifriction Coatings ◽  
Working Solution

Підвищення стійкості деталей проти зношуваннядвигунів сільськогосподарської техніки обґрунтовананеобхідністю покриття поверхонь спряжених дета-лей неорганічними, неметалевими, фосфатними плів-ками. Підібрано та обґрунтовано технологічний про-цес, умови підготовки вихідних матеріалів та складробочого розчину за визначеної температури. Вста-новлено за результатами досліджень залежності:температури робочого розчину від концентрації;лінійної швидкості в контрольних точках від величи-ни зношення поверхні зразків. Запропоновані рекомен-дації щодо реалізації технології нанесення антифрик-ційного покриття у виробництві. Технологічний про-цес нанесення конверсійних покриттів із насиченнямїх наноматеріалами апробований для виготовленнядеталей тертя двигунів сільськогосподарської техні-ки і має достатню комерційну привабливість. Increasing of the resistance against wear of parts of agricultural machinery is grounded on necessity of coating the surfaces of the mating parts with inorganic non-metallic phosphate films. Manufacturing process conditions for the preparation of starting materials and the composition of the working solution at a predetermined temperature based. During the research has been established such relationship: the temperature of the working solution concentration; the linear velocity at the control points on the wear surface of the samples. The recommendations for the implementation of the technology antifriction coatings in production have been recommended. Technological process of putting coating with the saturation of nanomaterial tested for the manufacture of friction components of agricultural machinery and engines has enough commercial appeal.

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