I plan to used a Bourne reaction system or similar to study reactive mixing. I wish to vary the viscosity of the system between experiments to understand how the viscosity influences the reactive mixing. This could normally be done using different concentrations of CMC or other additive. However during the Bourne reaction systems a neutralization reaction occurs resulting in change in pH which affects many additives and alters the viscosity.
Does anyone know a compound which can be used to increase the viscosity of an aqueous solution such that the viscosity is stable over a range of pHs?
Some products (hydrogel like borchi for exemple) able to increase viscosity will probably be affected by a changing of pH. Nevertheless, i am pretty sure that aqueous solvents like Ucon Oil would not be affected if you use it in a small proportion.
https://www.dow.com/en-us/document-viewer.html?ramdomVar=1755122682299798618&docPath=/content/dam/dcc/documents/en-us/app-tech-guide/118/118-01346-01-ucon-fluidslubricants-brochure.pdf
It's a lubricant that we use a lot in suspension rheology and we never had any issues about pH variations.
Hope it will help.
Best wishes,
Duncan Gilbert
Laponite nanoparticles create viscous, shear-thinning aqueous solutions. According to the brochure (byk.com/fileadmin/byk/additives/product_groups/rheology/former_rockwood_additives/technical_brochures/BYK_B-RI21_LAPONITE_EN.pdf), Laponite EP can be used for solutions over broad pH ranges. I have received free samples of Laponite, so I would recommend reaching out to the suppliers for samples, if you think these would work for your system.
You can always control your solution pH after each experiment by adding for example few drops of HCl or NaOH or any acidic or alkaline solutions that not affect your reaction of interest.
Michael Tebboth Laponite nanoparticles create viscous, shear-thinning aqueous solutions.
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