Table 1

Overview of results from different methods

Method

Environment

Operation frequency (Hz)

Uncorrected modulus of elasticity (GPa)

Modulus of elasticity (GPa)


Nanoindentation

Liquid

1

-

1.3 ± 0.4

Peakforce QNM

Liquid

103

1.0 ± 0.2

1.6 ± 0.3

Peakforce QNM

Air

103

1.3 ± 0.3

2.1 ± 0.5

HarmoniX

Air

105

1.2 ± 0.2

1.9 ± 0.3


Overview of results from different methods under different environmental conditions, 4th column represents the corrected values for modulus of elasticity. This correction is the same as done in the analysis of the indentation measurements; the contact area is changed to a spherical indenter on an infinite cylinder (average fibril height of 9.0 ± 0.4 nm, measured in AFM tapping mode) and is corrected for the finite sample thickness as described in the "Methods" section.

Sweers et al. Nanoscale Research Letters 2011 6:270   doi:10.1186/1556-276X-6-270

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