Fig. 5

a Typical load–depth curves of nanoindentation tests in cell wall of windmill palm fibers in different layers; Residual indentations on cell wall of windmill palm fibers in a inner, b middle, c outer layer
a Typical load–depth curves of nanoindentation tests in cell wall of windmill palm fibers in different layers; Residual indentations on cell wall of windmill palm fibers in a inner, b middle, c outer layer