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

How can I make a poly (ethylene-co-vinyl alcohol), EVOH, membrane flexible?

Hello, I am using phase inversion to make EVOH membranes, using DMSO as a solvent and ethanol as a non-solvent. When the membrane is wet it is flexible and stretchable. However, once I dry it in...

10 November 2018 1,635 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

Why can't make aluminum nitride film successfully by use sputter?

We use reactive sputtering process to make aluminum nitride film, and want to make c-axis aluminum nitride film on a silicon substrate, but the crystal orientation cannot be seen with...

03 March 2021 7,975 3 View

Adherance of Polyaniline coating over stainless steel?

Is the electropolymerisation of polyaniline coating over stainless steel (SS) via Cyclic voltammetry technique is really adherant? Else how to improve the adhesion of the coating, whether any...

01 March 2021 8,220 2 View

How to check the uv-vis absorption of nanoparticle by surface plasmon resonance?

I try to check the uv-vis absorption of Indium nanoparticle. Now I am measuring in solution, can I measure it in the form of a film?

01 March 2021 930 3 View

Is there a method of determining feed digestibility without the need to re-pellet the feed?

I am aiming to determine the ADC values of a commercial fish feed, but I do not have a steam pelleter or extruder available to me. Ideally, the pellets could be coated with some inert marker....

28 February 2021 7,967 3 View

1 nm thick MgO thin-film to be deposited on Si wafer using thermal evaporation. What will be the optimum deposition conditions?

Favourable conditions of base pressure, rate of deposition. Also, by which characterisation technique to be used to verify the thickness of the deposited film.

28 February 2021 3,640 3 View

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

28 February 2021 8,466 2 View

How to immerse bricks in wax ( for coating ) ?

Do we immerse the bricks horizontally or vertically ? #bricks#waterproofingsurface#civil#engeenering#chemicalengineering#wax#parafinwax

28 February 2021 6,685 2 View

For gelatin coating for culturing HUVEC.Should the gelatin be made in sterile water or PBS? Do I need to autoclave the gelatin soln after making it ?

I want to use 0.1% gelatin. Should that be made in PBS or sterile water? Should I autoclave the gelatin soln after making it in water/PBS?

28 February 2021 274 2 View

Why is my platinum counter electrode getting dirty during electrodeposition?

I am conducting anodic electrodeposition of MnO2 onto a stainless steel substrate, using a platinum strip as a counter electrode. This is done galvanostatically, with the current held between 5...

27 February 2021 1,829 3 View

What pH condition required to coat APTES on silica coated Fe3O4?

It's a hydrolysis reaction, which may produce by either acid or base-catalyzed reaction. so can anybody help me with this, which condition is suitable for this reaction?

26 February 2021 1,760 8 View