Fundamental Study on Needleless Electrospinning Based on Metal (Card) Clothing

2013 ◽  
Vol 662 ◽  
pp. 103-107
Author(s):  
Yan Bo Liu ◽  
Ze Ru Zhang ◽  
Peng Cheng Li ◽  
Velmurugan Thavasi
Keyword(s):  
Theoretical Analysis ◽  
Polyvinyl Alcohol ◽  
Scaling Up ◽  
Electrospinning Process ◽  
Experimental Results ◽  
Fundamental Study ◽  
Needleless Electrospinning ◽  
Electrospinning Method ◽  
New Process ◽  
Different Types

This paper discloses a method for producing nanofibers by a needleless electrospinning process based on the metal (card) clothing. 20% w/w polyvinyl alcohol (PVA) solution was employed to demonstrate the feasibility of this new electrospinning technology. Different types of metal clothing were used to produce PVA nanofibers under different voltages in the experiments; theoretical analysis of this new electrospinning method was also carried out to understand the experimental results. The results indicated the great potential for scaling up this new avenue for producing nanofibers through electrospinning, especially when medium sized clothing was used in the new process.

Experiment Study on Novel Precision Cropping Machinery Using Rotary Striking Action

2013 ◽  
Vol 281 ◽  
pp. 287-292 ◽  
Author(s):  
Ren Feng Zhao ◽  
Sheng Dun Zhao ◽  
Bin Zhong
Keyword(s):  
Industrial Production ◽  
Experimental Results ◽  
Control Mode ◽  
Experiment Study ◽  
New Process ◽  
Different Types ◽  
New Type ◽  
Working Principle ◽  
Process Method

This paper illuminates a new type of precision cropping process method with rotary striking action. The new process makes use of a controllable circumferential strike on a metal bar with a V-shaped notch. The working principle of the machine is described. Different types of metal bars have been tested, and both bad results and successful results were stated in the paper. The most ideal control mode has been obtained. The experimental results show that the new cropping process can crop bars with different materials and diameters. In some cases, it can be directly used in the subsequent industrial production.

scholarly journals Fiber Generators in Needleless Electrospinning

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Haitao Niu ◽  
Tong Lin
Keyword(s):  
Production Rate ◽  
Scale Up ◽  
Electrospun Nanofibers ◽  
Scaling Up ◽  
Electrospinning Process ◽  
Recent Advances ◽  
Needleless Electrospinning ◽  
Application Potential

The conventional electrospinning often uses a needle-like nozzle to produce nanofibers with a very low production rate. Despite the enormous application potential, needle electrospun nanofibers meet difficulties in broad applications in practice, due to the lack of an economic and efficient way to scale up the electrospinning process. Recently, needleless electrospinning has emerged as a new electrospinning mode and shown ability to produce nanofibers on large-scales. It has been established that the fiber generator, also referred to as “spinneret” in this paper, in needleless electrospinning plays a key role in scaling up the nanofiber production. This paper summarizes the recent advances in the development of needleless spinnerets and their influences on electrospinning process, nanofiber quality, and productivity.

Jet Repulsion in Multi-Jet Electrospinning Systems: From Needle to Needleless

2014 ◽  
Vol 852 ◽  
pp. 624-628 ◽  
Author(s):  
Yuan Sheng Zheng ◽  
Yong Chun Zeng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Fields ◽  
Fiber Diameter ◽  
Electrospinning Process ◽  
Experimental Results ◽  
Needleless Electrospinning ◽  
Difficult Issue ◽  
Element Method

Jet repulsion is the most difficult issue in the multineedle electrospinning process. This study aims at reducing the jet pulsion by designing the spinneret. Three different multijet electrospinning configutations are used to study the jet repulsion in multijet electrospinning process. The experimental results shows that adding a PTFE cylinder to the traditional multineedle electrospinning setup can reduce the jet repulsion, but the diameter and irregularity of the resultant fiber other increased. A needleless electrospinning setup using a multihole plate to replace the needles can reduce jet repulsion effectively, reduce fiber diameter and irregularity as well. And the electric fields of the three electrospinning configurations are simulated by finite element method to explain the experiment results.

Investigation of a New Needleless Electrospinning Method for the Production of Nanofibers

2013 ◽  
Vol 8 (4) ◽  
pp. 155892501300800 ◽  
Author(s):  
Deogratias Nurwaha ◽  
Wanli Han ◽  
Xinhou Wang
Keyword(s):  
Strong Interaction ◽  
Applied Voltage ◽  
Fiber Diameter ◽  
Electrospun Fiber ◽  
Scaling Up ◽  
Processing Parameters ◽  
Needleless Electrospinning ◽  
Electrospinning Method ◽  
Multiple Jets ◽  
Productivity Rate

This paper presents the possibility of nanofiber formation by a new multiple jet method. A novel needleless electrospinning apparatus was used to produce nanofibers. This employs a new design for supplying solution to a metal roller spinneret. The advantage of this setup is its ease of scaling-up for increased output. Using this new method it was possible to increase the nanofiber production rate because of the multiple jets. The productivity rate has been significantly enhanced and was 24–30 times higher than single needle electrospinning. It was also possible to produce thinner fibers than the single needle method. It was found that fibers produced by this novel needleless electrospinning had fewer beadings than fibers produced by the conventional electrospinning method. The effects of processing parameters including applied voltage and spinning electrospinning distance on eletrospun fiber diameter were also investigated. The study showed that the electrospun fiber diameter was strongly governed by the processing parameters. It was observed that there was a strong interaction between these parameters.

Dextran nanofiber production by needleless electrospinning process

e-Polymers ◽  
2014 ◽  
Vol 14 (1) ◽  
pp. 5-13 ◽  
Author(s):  
Funda Cengiz-Çallıoğlu
Keyword(s):  
Surfactant Concentration ◽  
Water Solution ◽  
Electrospinning Process ◽  
Optimum Process ◽  
Fiber Density ◽  
Uniformity Coefficient ◽  
High Fiber ◽  
Fiber Properties ◽  
Needleless Electrospinning ◽  
Electrospinning Method

AbstractThis article presents the formation of a dextran nanofibrous layer by needleless electrospinning. Optimum process parameters such as polymer solution and addition (surfactant) concentration, voltage, distance, etc. were determined to obtain uniform and smooth dextran nanofibers. It was not possible to produce nanofibers from pure dextran/water solution. Instead, solution drops were deposited on the collector; therefore, anionic surfactant was added in various concentrations to start the nanofiber production. Also, the effects of surfactant concentration on the solution properties, spinnability and fiber properties were determined. Generally, uniform and fine nanofibers were obtained from the rod electrospinning method. The value of 2 wt% surfactant concentration was chosen as the optimum concentration to produce a dextran nanofibrous layer by roller electrospinning. According to the results, spinning performance was 0.6726 g/min per meter, average fiber diameter was 162 nm, diameter uniformity coefficient was 1.03 and the nonfibrous area was 0.5%. In conclusion, this methodology resulted in the production of good product properties such as good spinnability, fine and uniform nanofibers and high fiber density.

Guided Waves Measurement Techniques in Pitch-Catch Configuration

2020 ◽  
Author(s):  
Francesco Cordella ◽  
Francesco Bertoncini ◽  
Mauro Cappelli
Keyword(s):  
Experimental Investigation ◽  
Theoretical Analysis ◽  
Experimental Method ◽  
Long Range ◽  
Guided Waves ◽  
Measurement Techniques ◽  
Theoretical Background ◽  
Experimental Results ◽  
Discharge Pipe ◽  
Different Types

Abstract Guided waves testing allows a long-range screening in pipes of different types and represents an effective and powerful non-destructing technique for defect detections using a limited number of points of measures. After the characterization through a general theoretical analysis, the focus is set to a real steam discharge pipe with a high mechanical complexity used for many years in a research plant now dismissed. The experimental method applied here is the pitch-catch configuration of two magnetostrictive sensors. The objective of this paper is to establish a strong theoretical background to pave the way for a robust experimental investigation. Preliminary experimental results are consistent with the theoretical analysis.

scholarly journals Upward Needleless Electrospinning of Nanofibers

2012 ◽  
Vol 7 (2_suppl) ◽  
pp. 155892501200702 ◽  
Author(s):  
Haitao Niu ◽  
Xungai Wang ◽  
Tong Lin
Keyword(s):  
Electric Field ◽  
High Intensity ◽  
Electrospinning Process ◽  
Fiber Formation ◽  
Diameter Distribution ◽  
Fiber Morphology ◽  
Wire Surface ◽  
Elementary Method ◽  
Needleless Electrospinning ◽  
Electrospinning Method

Polyacrylonitrile (PAN) nanofibers were prepared by a needleless electrospinning method using three rotating fiber generators, cylinder, disc and coil. The effects of the spinneret shape on the electrospinning process and resultant fiber morphology were examined. The disc spinneret needed the lowest voltage to initiate fiber formation, followed by the coil and cylinder. Compared to cylinder, the disc and coil produced finer fibers with narrower diameter distribution. The productivity of a coil was 23 g/hr, which was much larger than that of the cylinder spinneret having the same length and diameter. Finite elementary method was used to analyze the electric field. Stronger electric field was found to be formed on disc and coil surface, which concentrated on the disc circumferential edge and coil wire surface, respectively. For cylinder, the high intensity electric field was mainly concentrated on the end area. Concentrated electric field on the fiber generating surface could be used to explain the better electrospinning performance of coil, which may form a new concept for designing needleless electrospinning spinnerets.

Functionalized polyvinyl alcohol nanofiber webs containing β–cyclodextrin/Vitamin C inclusion complex

2019 ◽  
pp. 152808371986693
Author(s):  
Nazan Okur ◽  
Canan Saricam ◽  
Ikilem Gocek ◽  
Berdan Kalav ◽  
Umut Kivanc Sahin
Keyword(s):  
Vitamin C ◽  
Inclusion Complex ◽  
Polyvinyl Alcohol ◽  
Inclusion Complexes ◽  
Electrospinning Process ◽  
Alcohol Solution ◽  
Topical Drug Delivery ◽  
Electrospun Nanofiber ◽  
Visible Spectroscopy ◽  
Electrospinning Method

In the present study, the electrospinning method was used to develop β–cyclodextrin functionalized polyvinyl alcohol nanofiber webs. The electrospinning parameters were adjusted in order to obtain uniform nanofiber webs by incorporation of varying concentrations of polyvinyl alcohol and β–cyclodextrin in the solutions. Subsequently, β–cyclodextrin/Vitamin C inclusion complexes were added into the polyvinyl alcohol solution, and adjusted parameters were used in the electrospinning process of functionalized polyvinyl alcohol nanofiber webs containing β–cyclodextrin/Vitamin C inclusion complexes. The formation of nanofiber webs was demonstrated by using Scanning Electron Microscopy. The presence of the inclusion complex in the functionalized electrospun polyvinyl alcohol nanofiber webs was proven by using ultraviolet–visible spectroscopy and Fourier Transform-Infrared Spectroscopy. Consequently, it was achieved to functionalize polyvinyl alcohol electrospun nanofiber webs by incorporating β–cyclodextrin/Vitamin C inclusion complex, which might be considered to have useful applications in cosmetics, personal-care products, and topical drug delivery.

scholarly journals Biocompatibility Study of Electrospun Nanocomposite Membranes Based on Chitosan/Polyvinyl Alcohol/Oxidized Carbon Nano-Onions

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4753
Author(s):  
Jorge Iván Castro ◽  
Manuel N. Chaur ◽  
Carlos Humberto Valencia Llano ◽  
Mayra Eliana Valencia Zapata ◽  
José Herminsul Mina Hernandez ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Crystallinity Index ◽  
Electrospun Nanofibers ◽  
Electrospinning Process ◽  
Number Of Patients ◽  
Degradation Analysis ◽  
Electrospinning Method ◽  
Oxidized Carbon ◽  
Biocompatibility Study

In recent decades, the number of patients requiring biocompatible and resistant implants that differ from conventional alternatives dramatically increased. Among the most promising are the nanocomposites of biopolymers and nanomaterials, which pretend to combine the biocompatibility of biopolymers with the resistance of nanomaterials. However, few studies have focused on the in vivo study of the biocompatibility of these materials. The electrospinning process is a technique that produces continuous fibers through the action of an electric field imposed on a polymer solution. However, to date, there are no reports of chitosan (CS) and polyvinyl alcohol (PVA) electrospinning with carbon nano-onions (CNO) for in vivo implantations, which could generate a resistant and biocompatible material. In this work, we describe the synthesis by the electrospinning method of four different nanofibrous membranes of chitosan (CS)/(PVA)/oxidized carbon nano-onions (ox-CNO) and the subdermal implantations after 90 days in Wistar rats. The results of the morphology studies demonstrated that the electrospun nanofibers were continuous with narrow diameters (between 102.1 nm ± 12.9 nm and 147.8 nm ± 29.4 nm). The CS amount added was critical for the diameters used and the successful electrospinning procedure, while the ox-CNO amount did not affect the process. The crystallinity index was increased with the ox-CNO introduction (from 0.85% to 12.5%), demonstrating the reinforcing effect of the nanomaterial. Thermal degradation analysis also exhibited reinforcement effects according to the DSC and TGA analysis, with the higher ox-CNO content. The biocompatibility of the nanofibers was comparable with the porcine collagen, as evidenced by the subdermal implantations in biological models. In summary, all the nanofibers were reabsorbed without a severe immune response, indicating the usefulness of the electrospun nanocomposites in biomedical applications.

Effect of Solution Properties and Operating Parameters on Needleless Electrospinning of Poly(Ethylene Oxide) Nanofibers Loaded with Bovine Serum Albumin

2019 ◽  
Vol 16 (10) ◽  
pp. 913-922 ◽  
Author(s):  
Ramprasath Ramakrishnan ◽  
Jolius Gimbun ◽  
Praveen Ramakrishnan ◽  
Balu Ranganathan ◽  
Samala Murali Mohan Reddy ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Salt Content ◽  
Electrospinning Process ◽  
Solution Viscosity ◽  
Operating Parameters ◽  
Solution Properties ◽  
Wire Electrode ◽  
Needleless Electrospinning

Background: This paper presents the effect of solution properties and operating parameters of polyethylene oxide (PEO) based nanofiber using a wire electrode-based needleless electrospinning. Methods: The feed solution was prepared using a PEO dissolved in water or a water-ethanol mixture. The PEO solution is blended with Bovine Serum Albumin protein (BSA) as a model drug to study the effect of the electrospinning process on the stability of the loaded protein. The polymer solution properties such as viscosity, surface tension, and conductivity were controlled by adjusting the solvent and salt content. The morphology and fiber size distribution of the nanofiber was analyzed using scanning electron microscopy. Results: The results show that the issue of a beaded nanofiber can be eliminated either by increasing the solution viscosity or by the addition of salt and ethanol to the PEO-water system. The addition of salt and solvent produced a high frequency of smaller fiber diameter ranging from 100 to 150 nm. The encapsulation of BSA in PEO nanofiber was characterized by three different spectroscopy techniques (i.e. circular dichroism, Fourier transform infrared, and fluorescence) and the results showed the BSA is well encapsulated in the PEO matrix with no changes in the protein structure. Conclusion: This work may serve as a useful guide for a drug delivery industry to process a nanofiber at a large and continuous scale with a blend of drugs in nanofiber using a wire electrode electrospinning.

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