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Bamboo was thermally treated at 180°C and 200°C, and the micromechanical properties of its cell walls were investigated by means of quasi-static and dynamic nanoindentation experiments. With increasing treatment temperatures, the average dry density and mass of the bamboo decreased, whereas the already reduced elastic modulus at 180°C of the fiber cell walls did not change, but the hardness showed increasing tendencies. Dynamic nanoindentation revealed reduced storage modulus(    E  ′   r   )    $({E'_{\rm{r}}})$    and loss modulus(    E  ″   r      )    $({E''_{\rm{r}}}\,)$    for the thermotreated bamboo cell walls compared with the untreated bamboo fibers in all frequency regions. Moreover,E  ′   r   ,       E  ″   r   ,    ${E'_{\rm{r}}},{\rm{ }}{E''_{\rm{r}}},$    and loss tangent (tan δ) of treated bamboo decreased with increasing treatment temperature.

Quasi-static and dynamic nanoindentation to determine the influence of thermal treatment on the mechanical properties of bamboo cell walls