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Nanomechanical mapping and strain rate sensitivity of microcrystalline cellulose
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Nanomechanical mapping and strain rate sensitivity of microcrystalline cellulose
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Journal Article
Nanomechanical mapping and strain rate sensitivity of microcrystalline cellulose
2021
Overview
Nanoindentation provides a convenient and high-throughput means for mapping mechanical properties and for measuring the strain rate sensitivity of a material. Here, nanoindentation was applied to the study of microcrystalline cellulose. Constant strain rate nanoindentation revealed a depth dependence of nanohardness and modulus, mostly attributed to material densification. Nanomechanical maps of storage modulus and hardness resolved the shape and size of voids present in larger particles. In smaller, denser particles, however, where storage modulus varied little spatially, there was still some spatial dependence of hardness, which can be explained by cellulose’s structural anisotropy. Additionally, hardness changed with the indentation strain rate in strain rate jump tests. The resulting strain rate sensitivity values were found to be in agreement with those obtained by other techniques in the literature.
Graphic abstract
Publisher
Springer International Publishing,Springer Nature B.V,Materials Research Society
Subject
