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 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

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

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Buffer to disrupt platelet alpha granules for PF4 quantification?

Hello! I want to quantify by ELISA the secreted (from platelets poor plasma) and the non-secreted (from platelet lysate) PF4 before and after TRAP stimulation. I will use the ELISA from R&D...

03 March 2021 1,499 2 View

What are the values needed for gabor filter's parameter for cifar10 data?

Hi, I implemented a code to gabor filter cifar10 data but the images after being filtered and stacked are not clear like the original images. I think the problem is in the way I am using the...

03 March 2021 6,317 1 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before?

Question to you and THEM, the New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before? There appears to be a core problem for...

02 March 2021 3,024 2 View

Research on Supply Chain Management in Indian context?

Hi, I am planning to apply for the PhD degree in the Supply Chain Mgt. with specific area of "Cold Storage warehouses" during Pandemics and wars. Where lock downs and shut downs are frequent....

02 March 2021 285 2 View

Does anyone know HRM channel in a 2 plex QIAGEN Rotor- Gene Q qPCR can be used as a separate channel?

I am going to have 3 different probes in my qPCR work that I am going to do. But I realized that the machine we have in the lab is a Rotor-Gene Q 2plex HRM Platform, saying it has green, yellow,...

01 March 2021 8,544 1 View

I have designed reflectarray element and feeding it though Horn Antenna on HFSS. After full wave simulation, I am not getting desired results?

I have designed reflectarray element to generate OAM beams at 5.8GHz and feeding it though Horn Antenna on HFSS. After full wave simulation, i am not getting desired results i.e Radiation pattern...

01 March 2021 9,701 5 View