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. Author manuscript; available in PMC: 2013 Apr 17.

Published in final edited form as: Langmuir. 2012 Apr 5;28(15):6348–6355. doi: 10.1021/la300482x

Apparent Young’s modulus of (PDADMA/PSS)₁₅ multilayer surfaces, one un-annealed ( ), the other annealed in 1 M NaCl ( ), at different indentation velocities. The salt concentration of the polyelectrolyte solution was 1 M NaCl during build up and 10 mM for these in situ indentations, which probe the top 50 nm of the PEMU. The indentation velocity varied from 50 nm/sec to 3.15 μm/sec.

Inline graphic — Apparent Young’s modulus of (PDADMA/PSS)₁₅ multilayer surfaces, one un-annealed ( ), the other annealed in 1 M NaCl ( ), at different indentation velocities. The salt concentration of the polyelectrolyte solution was 1 M NaCl during build up and 10 mM for these in situ indentations, which probe the top 50 nm of the PEMU. The indentation velocity varied from 50 nm/sec to 3.15 μm/sec.