The dispersion medium of the suspension is an aqueous solution of tetramethylammonium bromide (CH3)4NBr 2*10-6 mol/dm3 at 25°C (ε=78.4). Calculate the DEL thickness χ-1 in this medium. What equation should be used to calculate the ζ potential from the electrophoretic mobility if the particle radius were 30 nm?

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