Aisha Tanvir

11 Questions 32 Answers 0 Followers

Questions related from Aisha Tanvir

Lay sequence for composite manufacturing?

Surfboards consists of a foam (lightweight) core and a fiberglass (stiffness) skin. Wet hand-layup is the most commonly used manufacturing method, several layers of fibre glass fabric are laid up...

12 December 2018 6,284 3 View

Possible techniques to measure the pore size of an electrospun mesh?

The most commonly reported technique in the literature to measure pore size is by SEM. However, I am doubtful regarding the accuracy of this technique for various reasons, the primary one being,...

08 August 2017 6,795 6 View

Rotary evaporation prior to freeze drying to reduce amount of water in a nano cellulose suspension?

I have a rather large amount of nano cellulose suspension (~1L) that needs to be dried. Unfortunately, the freeze dryer I have access to is of much smaller capacity. I am looking for ways to...

08 August 2016 7,351 2 View

What does an XRD peak at 23° for graphene oxide indicate?

GO was prepared using the modified hummers method, XRD analysis showed a broad peak at around 24°(pic attached), I am not sure what this indicates. Lit. survey shows that both graphite as well as...

01 January 2015 8,976 17 View

How can I obtain aligned nanofibers by ES?

I tried to electrospin a magnetized polymer solution in the presence of a magnetic field but did not get any alignment at all. The setup I use is quite simple, 2 magnets are placed paralled to...

12 December 2014 8,641 13 View

How can I disperse magnetic nano particles in PVA?

I have been trying to disperse Fe304 nanoparticles in PVA solution by using a bath sonicator for 12-15 hours. After sonication, upon doing TGA analysis (in Nitrogen) to check for the percent of...

11 November 2014 1,609 8 View

How can I reduce contact angle of polystyrene nanofiber film?

The contact angle is approx 120, I would like to reduce it. I tried cold plasma, but it is still the same. Look forward to any suggestions....

09 September 2014 4,058 6 View

What is the best solvent for base polyaniline and polystyrene?

I am making a PS/PANI blend. I have used DMF as the solvent, initially i try to dissolve PANI in it (ultrasonication), and then add PS and stir till i get a clear solution. However the problem is,...

09 September 2014 8,608 19 View

Can anyone assist with an appropriate solvent for polystyrene - electrospinning?

I am electrospinning polystyrene, up until now i used dmf as the solvent but due to the high bp of dmf it does not completely evaporate resulting in thick/webbed fibers. I tried using DMSO, but...

09 September 2014 5,573 5 View

Why am I getting electrospraying during electrospinning?

I was trying to spin a 20%Polystyrene solution (solvent used is DMF). One problem I have been facing recently is electrospraying, When I start the electrospinning process fibers form in the...

09 September 2014 9,376 10 View

Is anyone familiar with the handling of electrospun nanofibres sheet/mesh?

I get a nice uniform sheet of electrospun nanofibres, however after some time when it dries out the sheet starts cracking into pieces, making it very hard to transfer the sheet onto something...

09 September 2014 9,356 16 View