Michael Smith

8 Questions 18 Answers 0 Followers

Questions related from Michael Smith

Why won't Polyacrylamide hydrogel gel as droplet in oil when it does by itself in the bottle?

I'm sure this is a silly question but we are trying to make some droplets of a polyacrylamide hydrogel. Ingredients are acrylamide monomer, bis-acrylamide, aps (initiator) and TEMED...

05 May 2016 5,001 4 View

How does the friction coefficient of two polymer brush coated surfaces change with Refractive Index of solvent?

I'm interested in understanding how the Stribeck curve for two polymer brush coated surfaces might change if the refractive index of the liquid is tuned across a range of values including the...

11 November 2015 5,073 6 View

How do I synthesise ultra high molecular weight Polyacrylamide?

Physicist asking dumb questions alert: I want to synthesise polyacrylamide with a molecular weight ~ millions of Da. I want to do this so that I can add a small quantity of other monomers into the...

03 March 2015 3,261 6 View

Can anyone recommend an aqueous salt or sugar solution that has a refractive index of up to 1.49?

I have a liquid (decalin-tetralin mix with a refractive index of 1.49) I want to suspend it in a liquid with which it is immiscible and has relatively low viscosity. I know you can raise the...

05 May 2014 9,026 5 View

Choosing correct finite element to model curved cantilever?

I'm trying to model the bending of a cantilever which is curved in the absence of any applied load. I load the last node of my cantilever with a force and watch it bend. I'm new to Finite Element...

10 October 2013 2,889 14 View

Is it possible to modify the surface of liquid Gallium with a thiol to make it hydrophobic?

I'd like to change the wetting of liquid water on a liquid Gallium surface. One naive idea I had was whether it is possible to react the Gallium with a thiol-alkane. I know these work well with...

03 March 2013 5,682 12 View

Material that can melt near room temperature, be hydrophobic and has high density?

I'm trying to find a material which: melts between 0 and 60 deg; a high density (ie >>1) and is hydrophobic. Gallium melts at 29 and has a high density but is hydrophilic. Can anyone suggest an...

02 February 2013 9,172 8 View

What is a simple way to graft high Mw PEO to a hydrophobic surface?

I have a standard (i.e. not functionalised) PEO molecule with a Mw of 4E6. I would like to be able to attach one end to a surface (density doesn't need to be that high). This surface needs to be...

12 December 2012 3,003 7 View