Surface chemical analysis. Scanning probe microscopy. Procedure for the determination of elastic moduli for compliant materials using atomic force microscope and the two-point JKR method1 Scope This document describes a procedure for the determination of elastic modulus for compliant materials using atomic force microscope (AFM). Force distance curves on the surface of compliant materials are measured and the analysis uses a two point method based on Johnson Kendall Roberts (JKR) theory. This document is applicable to compliant materials with elastic moduli ranging from 100 kPa to 1 GPa. The spatial resolution is dependent on the

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