Questions related to Electrospinning
We are trying to make Silk fibroin and PVA blend solution in formic acid for electrospinning but it is not miscible. I tried following
1. I tried to dissolve both in 99% formic acid but the solution wasn't look proper for electrospinning.
2. I also tried to mix the both by dissolving individual in formic acid.
3. I also tried to mix by dissolving silk in formic acid and PVA in water.
In all three cased i didn't get the homogeneous solution for electrospinning
Dear all, my spinnable solution is acidic aqueous PVA + Aluminum nitrate, and my collector is Aluminum foil, but the nanofibers don't settle on the collector. I know that the viscosity of my solution is ok. I tried with different voltages and distances but the problem still exists. do you know what the reason is?
We are trying to electrospin SiC fibers for some applications. In every study mentioned in the literature, they used the chemical I mentioned in the question. But I couldn't find any supplier here in the US.
Is anyone aware of where can i find this chemical? Please let me know. Thanks in advance.
It seems that the fiber morphology is still under the film. The fiber is well formed during spinning, and there is no obvious liquid drop on the receiving plate，humidity 50%, T=26℃，Voltage=14kv，The receiving device is aluminum foil, The solution is PES-C with a concentration of 18%, solvent DMF:NMP=6:4.
See the figure for details
i have read about use of chitosan, PVA, and plga and pla-based nanofibre but which grade should be used for electrospinning and centrifugal forcing please guide me .
I prepared a solution of nickel nitrate hexahydrate and PVP in the 12 ml mixture of DMF(8ml) and Ethanol (4 ml). The magnetic stirring of the solution was carried out for 6 hours at room temperature then it was filled in a 10 ml syringe and electrospinning was performed at 18V, 650 rpm, and 120 mm distance. Then it was dried at 80-degree temperature in a hot air oven for 12 hours then was calcined at 500 degrees in the tubular furnace for 1 hr. But the nanofibers were not produced and SEM images showed some random images of flake. Please suggest how to improve the process.
I had set up an in-house electrospinning apparatus with a horizontally positioned solution electrode and collection plate. The fiber mat from the collector has varied thicknesses from the center of the collection plate to the edge.
I tried to make a mat of PLA by using the electrospinning method, but after achieving a certain thickness, there is a formation of blisters and lumps on the mat surface.
Is it because of humidity or temperature? set humidity was 40%, temperature 25-28C
Good afternoon, I am trying to prepare solution for electrospinning with PEO,H2O and NaCl.
The MW of PEO is 1,000,000.
At the beginning I add 1,25% NaCl to 95,75% water under 25°C stirring, then I add 3% PEO and stir it under 80-90°C till it will be completely dissolved (+ - 4 hours). Instead of fbers I get solution droplets.
If anybody can say me where my mistake is ?
Also I tried - PEO 3%, H2O 95,25% and NaCl 1,75% /// PEO 3%,H2O 94,5% and NaCl 2,50%. , and PEO with concentration 1%,1.4%,1.63%,1.75%,2%,3.7%,4% - everything are failed.
Maybe someone can also say me what the parameter for PEO 1,000,000 will be the best for electrospinning?
I am planning to work in the area of Synthesis of Polymer matrix composites for various Industry applications.
We have a dedicated Lab comprising 'Electrospinning Machine'. So any collaborations and constructive remarks are most welcome.
Dr. Namdev Ashok Patil
#planning #work #research #electrospinning
I want to use electrospinning technology to make collagen and PLGA nanofibers. I used to use DCM and DMF as the solvent to dissolve collagen, but I did not find any Nitrogen from EDS.
I am trying to cut electospun nanofiber networks.
I made nanofiber networks with PEO solution by using near-field electrospinning on Si-wafer.
After depositing fibers on Si-wafer, now I am trying to cut nanofibers into rectangular shape. (Fiber diameter is about 350 nm and trying to cut 8 mm square shape)
Laser cutting will work but it takes so long time and expensive to cut up to 8 mm.
It will be really thankful if anyone can give me any advice.
I am learning about emulsion electrospinning and most of the papers only mention about the definition or application. Can someone give me few detailed example about emulsion electrospinning (core/shell components, ratio, optimal condition) so I can learn practically about it?
Hello everybody! :)
I apologize for the non-technical questions, but I hope you could help me! I feel like after the covid era I am still a bit "slowed down". Today I realized, that I forgot to check whether there are any conferences in tissue engineering, biomaterials, nanofibrous etc. during this summer 2022. I would truly like to FINALLY go somewhere, talk to other scientists in the field, present my research or at least to have a poster. Unfortunately, I wasn't able to find any conferences this summer, which are still open to applications. :( Could you, please, help me with this? Maybe you would have an idea about some local conference or summer school at your university (or research centre) in this field.
Thanks for your help and hopefully let's see each other during some summer appointment. :)
Does anyone know the best polymer and solvent that can be used for the perfect creation of a nanofiber sample using electrospinning? Ideally for drug delivery purposes.
I am just beginning my thesis on this topic and am looking for a nontoxic alternative to the acenes for functionalization and electrospinning with applications in pseudocapacitors and singlet fission if possible
I've been trying to the synthesis of Al2O3 fiber with electrospinning method with Aluminum isopropoxide as precursor, but Al2O3 fiber is broken after calcination. Can anyone guide what could be the problem? I have made the fibers according to several articles but fibers are broken after calcination.
I read a paper, that said they had dissolved PS by putting 7.5wt% PS in 46.25wt% HFIP and 46.25wt% DMF, stirring overnight. Is that true? How can I dissolve PS for electrospinning?
Can someone give me some parameters about the electrospinning process of the Nylon 6,6/Formic Acid solution? (concentration, flow rate, Voltage, etc.)
I tried Nylon/Formic Acid 20wt% (4 grams Nylon, 16 grams Formic Acid but it resulted in short, discontinuous fibers and sometimes the solution dropped directly on the collector. Any help is greatly appreciated. Thank you.
I prepare TiO2 compact layer with spin coating on to the FTO surface then , I prepare TiO2 nano fibers with electrospinning technique but after calcination at 500c 2h, fibers disconnects from the surface, how İ can solve this problem? ( I heat the furnace gradually to 5c/min)
I am currently working on electrospinning of polymers. I am looking for a solvent that can dissolve polysulfone or PVDF-HFP, but it is almost immiscible in water and alcohol. Also, I would prefer that the solvent is available on the market. Does anybody have a suggestion?
Looking forward to make polymer-nanocomposite based fiber film for temperature sensing in the range 25 to 40 °C. Looking for such polymer which will be flexible, and can be electrospin easily.
I am making PVDF solution for electrospinning, I only have DMF and acetone as solvents, so can you tell me the optimal conditions for this process? (ratio, temperature, time, stirring speed). Any other chemicals are fine, I'll buy them but please let me know the mentioned conditions.
Ladies and gentlemen... I want a guide explaining the electrical nanofiber system
How to use the electrospinning nanofiber system
I'm electrospinning 10%wt PLA in Chloroform:DMF at a ratio of 2:1. The solution dries up and clogs the tip after about 5-10mins. Could this be due to the low outside temperature and humidity during winter increasing the solution's viscosity?
I am looking for studies that investigate the effect of electrospinning parameters (solution and process parameters) on the thermal stability of nanofibers. Generally, the effect of nanofiller concentration on the degradation temperature was studied and TGA analysis was not applied for investigating the effect of process parameters on the weight change and degradation temperature.
I came across papers where researchers have used multiple polymers including both synthetic and natural for synthesizing electrospun nanofibers. But if we use these nanofibers in photocatalytic applications like degradation the polymer gets evaporated during calcination because we have to use the photocatalyst in powder form. So what remains the purpose of using multiple polymers?
Does anyone know what causes the current leakage to the nozzle pump during electrospinning?
During vertical electrospinning with ionic liquid, at high voltage, for example, 20 kV, an electrical current of 40% is established and the nozzle pump starts to sound. The %current increases with increasing voltage. (The numbers change each time the test is performed)
For testing, electrospinning was done with PVA solution (low conductivity solutions) and I still have the same problem.
I completely isolated the location of the syringe on the pump and I still have this problem.
The nozzle pump device has an earth connection wire.
The High Voltage power supply we used has the following characterization:
0-40 kV range, with a maximum current of 0.75 mA.
I am preparing PVDF solution for electrospinning by mixing 20 wt% PVDF in 7:3 DMSO:Acetone and stirring it at 75°C and 1000 RPM. But every time almost after an hour of preparation it is turning yellowish and too much viscous such that in middle of experiment syringe and needle gets jammed. I am not able to perform electrospinning for more than 30 minutes due to this.
What could be the possible reasons for this (such as lower ambient temperature, inappropriate solvents, solvent ratios, or any other )?
How can I overcome this problem?
In electrospinning after depositing nanofibers on Al foil, after how much time the foil can be taken out from the mandrel? Can we keep it on mandrel for some time to get the collected mesh solidified?
I was trying to electrospun a nano-fiber sheet used as electrode. The material I used is 14wt% PAN (150,000 MW) solution (solvent: DMF). The PAN solution was electrospun directly onto a Nickel substrate (Fig 1). After electrospining, this sample undergoes following heat treatments.
1. 240 degree C in muffle furnace for 2 hrs. Heat rate 1 deg C/min. Air atmosphere. To make the PAN from a thermoplastic to a thermoset material. (Fig 2)
2. 900 degree C in tube furnace for 1 hr. Heat rate 5 deg C/min. Argon atmosphere. To carbonize the PAN and make it electroconductive.
However, after the carbonization process, the PAN sheet shows a severe deformation(Fig 3). Looks like it is shrunken. And the Ni substrate bent. (Fig 4)
I was trying to make the PAN sheet covering the Ni substrate entirely after carbonization. Anyone knows the reason for the deformation of PAN sheet? Any suggestion on how to modify the process?
Can we use electrospun PVDF mat for temperature sensing? If yes, how to make an effective PVDF solution for electrospinning?
After synthesis of electrospun solution via sol-gel process, the solution is ready to be filled in the syringe to be electrospun. By which methods we can check the viscosity of this solution.
while doing electrospinning fibre is getting attracted towards needle and making a connection of floating fibre from collector to needle which is interrupting in fibre deposition. Lease suggest its solution and explain the reason behind this
I dissolve PVDF using DMaC/Acetone(1/1 and 6/4 mixture) and heated to 60 degrees to melt well.
And the solution was used for electrospinning, and the solution was cooled.
When i want to use the solution again, I raise it back to 60 degrees, but the solution doesn't become clear...
I don't know Why the PVDF solution doesn't melt again..
If you know, Please help me..
Does anyone have experience of a fault in an electrospinner which causes voltage to leak into the polymer solution/line?
Video attached to demonstrate electrical 'lightning' trying to ground itself from the syringe fittings. Burning appears within the polymer line.
Syringe is clean/there are no leaks. You receive a strong static electricity type shock if you touch any tubing/syringe/pump/anything conductive near the electrospinner while it is switched on.
I've tested multiple solutions - no pattern HOWEVER low conductivity solutions (with water for example) appear to need much higher voltage than usual to allow electrospinning - can't even get a fibre from PVA:H20 until up near 23kV (and it's still not really a stable fibre) when I should be able to spin PVA:H20 at much lower (9-13kV).
Any help greatly appreciated, even technical staff at the supplier seem stumped.
I would like to know if anyone has cut their electrospun material before into small round disks? Which precision device did you use (or can recommend) and did it disturb the morphology/architecture of fibres during the process? I do not have access to a laser cutter. I think a regular hole puncher would damage my fibres.
I am working with PCL electrospun fibres and would like to cut them to disks with a diameter of 14mm to fit into wells with 15.6mm diameters within a 24 well plate.
TiO2 has been extensively explored as the Photocatalytic material for a number of applications. what are the current mega trends that are in this field? What are the challenges that are still to be achieved and overcome?
I am currently doing an Electrospinning project, and I need to create an Hydroxyapatite solution that yields fibers. I plan to grind up HA into a powder and disperse it through Acetone (or IPA if I do not have enough Acetone). Can someone please tell me the steps on how I would approach this? I do not know if I have access to a sonication machine, but I do have a magnetic stirring machine. Any past experience would be appreciated.
When electrospinning polyhydroxyburyrate (PHB) dissolved in chloroform or dichloromethane, it often solidifies and clogs the needle. It has to be cleaned from time to time.
How to avoid this clogging?
I am currently trying to dissolve Hydroxyapatite pellets in Acetone to create a solution for nanofibers created in an electrospinning system. Other dissolving agents are available (such as isopropyl alcohol) though I am hoping to find advice specifically for acetone. I am mainly having trouble finding the volume percentages, how much of each must be used to obtain roughly 67 ml of solution and still create nanofibers. Any help would be appreciated, thank you.
Good evening everybody;
I am doing a research to produce a nanofiber membrane for HEPA (H14) filter production via electrospinning.
I have some questions:
1. I am spinning on a nonwoven substrate, should I calculate its area density (gsm) in the total gsm of the spun mat?
2. how could I judge on electrospun nanofiber based on the air permeability test results? i.e. I will check it according to standards (e.g. EN ISO 9237), the values will decrease by increasing gsm, when can I stop (range in mm/s)? before doing filtration efficiency test.
3. with your experience; should I keep some beads in the nanofiber web? or the spun mat should be beads-free? in literature both points of view are found.
I would like to measure the residual charge of the beads and fibers after electrospinning and compare them together. I would appreciate it if someone would introduce an experimental method for this purpose. Based on my educational guess, the beads should have a lower residual charge density than the fiber. Does anybody know a reference to support or reject this idea?
For preparing TiO2 /PVP nanocomposite by electrospinning, I mixed a TTIP/2-propanol (20 wt%) + 2 mL glacial acetic acid + 2.5 mL PVP/2-propanol (10 wt% or 8 wt%). Upon dropwise adding TTIP/2-propanol (20 wt%) to acidic polymer solution the solution turned cloudy instead of remaining transparent (used PVP is 360,000 g/mol).
At the moment of meassuring a polymer viscosity which one would you recomend? reomether, digital viscosymeter or glass viscocymeter.
It's for a biopolymer in solution that's is undergoing electrospinning.
I am trying electrospin chitosan with 50%, 70% and 90% acetic acid, 23kV and 10cm distance from the needle to the collecting drum. Any idea how i can get fine nanofiber without beads. I am to encapsulate an active ingredient, thus i cannot use TFA in the process.
I am using metal oxide/Graphene composite and electrospinning it using PVA/Water polymeric medium. When I deposit on the aluminum foil the surface is uniform with fewer flakes. I am speculating that this may be due to the polymer/solvent non-uniform evaporation from the surface due to annealing (450C for 2 hours). Can anyone suggest something from their experience about the annealing of metal oxide electrospun film for robust adhesion and uniform deposition? is these flakes normal? or do I need to change the polymer or solvent?
thanks in advance.
I am getting very thin membranes from electrospinning, so it is difficult to perform a mechanical characterization in a universal testing machine. Is there any form that is useful for estimating the tensile strength and / or elastic modulus of nanofibres?
From experience I know that the majority of electrospun mats are quite fragile, just the process of getting them off the collector can introduce stretching into the fibers.
I've tried sticking the electrospun mat on to a template and and then testing it, but one issue with that is the films often snap close to where they are glued onto the template, which makes me think the glue introduces some sort of stress concentration at the point it is applied (change in fiber shape, etc).
I've not been able to find a standard method for testing the tensile properties of electrospun mats, if there is one please share it...
I tried to prepare CNF via electrospinning. The Taylor cone was seen to have been formed and the spray looked quite good. However, after the spinning process, a powder-like material (which can easily be wiped out by rubbing the surface of the aluminium foil) was deposited instead of fiber mat. I would appreciate all your suggestions please.
I want to use PLA polymer for electrospinning. Recently I have used it with DCM but it freezed very quickly on the tip of the nozzle. Any solution for this?
The effect of the material type, whether it is crystalline or amorphous.
The temperature at which the polymer decomposes.
I'm working on setting up (bespoke) Electrospinning machine (multi emitter syringe pump, high voltage power supply, rotating/flat collector, etc. I'm thinking to perfrom hot electrospinning of the polymer (polyvinyl alcohol PVA) at a higher temperature ~ 250 DegC.
The questions I have in mind are the following:
i. Has anybody done this or similar to this kind, before or even is it possible?
ii. The problem is that the PVA polymer is in powder form and I don't want to load the syringes with aqueous solution of PVA; as I'm after 100% electrospun PVA nanofiber membrane.
Is there any method or machine unit that is available to do the job; to melt the PVA powder (melting point of PVA is 210 DegC) and somehow simultaneously electrospin onto the collector?
Actually, the problem is melting of the PVA powder is a separate process, then manually infusing into syringes (pipettes) is another and then at last loading on to the syringe pump for electrospinng, therefore, all experimental steps are performed at different temperatures. I know if I left the molten PVA in the syringes it will solidify and block the syringe barrel and also emitter needle, and syringe pump will also not be operational...
Shall wait for any advice from you guys.Many thanks for your time and support.
My question is very basic since I'm starter in the field of electrospinning. I want to prepare a PAN/gelatine blend by following the parameters already given by literature, but I don't understand the instruction of the solution preparation.
How should I exactly understand the following sentence " The spinning solution contained 16% PAN in DMSO and 9% gelatine". I can understand this in 3 ways:
a)A PAN solution with (16%wt) in DMSO and a gelatine solution (9%wt) in DMSO were prepared separetely and mixed together.
b) A PAN solution with (16%wt) in DMSO was prepared and afterwards gelatin was added to it so that the gelatin content at the end is 9%wt of the total solution mass
c) The solution was prepared in a way that the final solution consisted of 16%wt PAN and 9%wt gelatin.
Does anyone know what these strange structures (A,B,C,D,E) could possibly be?
Some informations that might be useful:
-This is a PAN nanofiber mat (10%wt in DMF) that was electrospun with a NanoSpiderTM NS Lab 500 S (Elmarco s.r.o., Czech Republic) using a wire electrode.
-These SEM images were taken few hours after the mat was electrospun (-> There might still be some solvent in the mat)
-The same structures are also present in a mat electrospun months ago by another person in the same lab (this mat was vacuum dried for days). Since this mat was stored for a long time, I tought that these structures could be microorganisms. But if this was true, these structures shouldn't be present in the mat that was electrospun today.
I would appreciate any theories/ideas about what these structures could be.
I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is 5cm (these conditions are already complex that I would not like to know if in their research they obtained that the higher the density, the higher the high voltage must be or if there is any relationship because the electrospinning worked twice but I did not know the density (it was more than 20w/v) and now that I try to find the density trying No I can find it. the solution is pva,i already tried with 20,25,30,35,40 (w/v) without any dopand. i should tried with w/v less than 10w/v? (i dont have a bomb).you can check the video o from one of those times that worked. and the drop is de pva with silver nanoparticles.but now i only lokking for pva electrospining without something. the power supply is a half of medium wave rectified