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. Author manuscript; available in PMC: 2015 Oct 18.
Published in final edited form as: Curr Opin Pharmacol. 2014 Oct 18;0:141–148. doi: 10.1016/j.coph.2014.10.001

Fig. 2.

Fig. 2

(a) TEM images of pristine halloysite from Dragon Mine, Utah, Applied Minerals Inc. Scale bar is 1 μm. b) Zeta-potential alternation in the processes of LbL assembly of multilayer shells on halloysite clay nanotube (PAA – polyacrylic acid, PSS – polystyrene sulfonate, PEI – polyethyleneimine, PAH – polyallylamine hydrochloride; (c) TEM image of (PAH/PSS/(PAH/silica)2 tube coating.