Why is my GO/polymer ultra-thin film showing poor gas selectivity?

Hello, I am creating a GO/polymer scaffold using a 2/100 ratio in a THF suspension (the polymer is soluble). I would then spin coat it onto a porous support. The membranes show reasonable...

31 December 2019 8,918 4 View

What is the procedure for spin coating multiple layers of monomer onto a porous support?

Hello, I am trying to spin coat a few layers of monomer solution in THF onto a porous support. What would be the best procedure to do so? Intuitively, it seems that every new coating would...

10 November 2019 3,626 4 View

What is the reason I cannot separate my siloxane material properly using column chromatography?

hello, I am trying to separate a star shaped siloxane polymer from starting material using column with some luck. Using 70/30 hexane/EA, I can get my product but with a few problems: 1- The...

06 July 2019 8,935 3 View

What side products can you expect from hydrosilylation reaction with styrenes?

Hello, I am trying to purify a reaction product of hydrosilylation with a styrene compound using Karstedt's catalyst. However, it seems to be cumbersome for the following reason. After...

03 April 2019 2,504 1 View

Why am I getting a hole in the middle of film during spin coating onto PDMS?

Hello, I am spin coating a non-polar monomer onto a PDMS layer, with the coating solution made up of chloroform. The concentration is very low. However, I keep getting a hole in the middle of the...

10 November 2018 4,760 0 View

Why am I getting uneven coating/Marangoni effect when spin coating PDMS onto LDPE?

Hello, I have been trying to spin coat a layer of PDMS (Slygard 184) onto LDPE. My problem is that with Toluene, I get the Marangoni effect, where I get small circular spots of PDMS onto LDPE...

10 November 2018 9,439 4 View

Is it possible to create LDPE membranes by phase inversion?

Hello, I have tried to create LDPE membranes using phase inversion but the result was a get-like, nonuniform membrane. The problem I think, is that LDPE can only dissolve in xylene at high...

09 October 2018 5,628 0 View

Why is my PDMS layer giving a low air permeability?

Hello, I am using Sylgard 184 crosslinked PDMS for composite membranes to test for air permeability. when I thermally crosslink it to test the permeability I get a value that is 50x less than...

09 October 2018 1,470 0 View

What is a simple way to fabricate a PDMS gutter layer?

Hello, I would like to spin coat PDMS onto a porous membrane to use as a gutter layer. However, I cannot seem to find any references on how to do so. I need to know what kind of PDMS to buy and...

09 October 2018 4,203 0 View

Can you spin coat a polymer using a solvent that swells the substrate?

Hello, I have been looking for references regarding this matter. I am trying to spin coat a polymer onto a PDMS substrate. The best solvent I can use is chloroform. However, it strongly swells...

09 October 2018 1,073 0 View

Polymer composites suddenly solidifies?

I am making polymer composite by solvent mixing method. When I am trying to add filler solution in polymer solution it quickly get solidified. How to make them then uinform? It doesn't give time...

03 March 2021 7,540 4 View

What solvent can I used for Paal Knorr reaction between 6-amino hexanoic acid and 2.5 hexanedione?

I am try to make the Paal Knorr reaction between 2.5 hexnedione and 6-amino hexanoic acid, my problem is type of solvent to use, because 6-hexaminohexanoic acid is soluble in water but I am not...

02 March 2021 4,443 2 View

Should we change media after1st 6hrs after plating HUVEC bought from INVITROGEN?it's not recomended by invitrogen.Will DMSO present in stock matter?

We have HUVEC bought from Invitrogen. Cat no -C-003-5c. while first plating the cells we have bought the protocol suggests not to centrifuge the cell with media to remove the DMSO. Should we...

02 March 2021 3,713 2 View

How to polymerize TEOS?

I want to polymerize TEOS on a surface. I know that NH4OH is a preferred catalyst and an alcoholic solvent should be used .But I can not find certain amounts of each material to use. Does any one...

02 March 2021 1,404 6 View

How can extract ciprofloxacin hydrochloride disolve in water er to organic solvent such as dichloromethan or any other solvent?

I need a procedure to extract the ciprofloxacin hydrochloride from aqueous solution by using dichloromethane in detail,. I thank you very much.

01 March 2021 4,306 1 View

How to separate water from glycerol solvent in a solvent recovery vacuum distillation column?

I am currently doing my third year design project. I have been assigned to design a glycerol recovery column in vinyl acetate monomer production. The process unit before the recovery column is an...

01 March 2021 9,525 4 View

How to make fractions of chloroform extract of plant, using seperating funnel?

28 February 2021 8,466 2 View

Bought HUVEC from Invitrgen.need to revive it.expected it is cryofreezed in DMSO.Do I need to remove the DMSO for plating the cell for the 1st time?

After I cryofreeze the cell do I need to remove the DMSO for culturing the cell for next passages .

28 February 2021 7,738 3 View

POlymer+DMSO solution and moisture??

What could be the reason of moisture at the sides of Vial when I am preparing my polmyer+DMSO solution for membrane fabrication? What etiquettes I am possibly missing here?

28 February 2021 6,516 5 View

Why am i not getting solid after reacting APTES with salicylaldehyde?

The reaction of APTES with salicylaldehyde in ethanol leads to the formation of imine compound yellow solid which is mention in literature, but I am not getting yellow solid I don't know why? when...

28 February 2021 2,955 2 View