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Measurement of mechanical properties of polymer nanospheres by atomic force microscopy: effects of particle size

Measurement of mechanical properties of polymer nanospheres by atomic force microscopy: effects of particle size

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© The Institution of Engineering and Technology
Published

The mechanical properties of polymer nanoparticles as a function of their size were measured using atomic force microscopy (AFM). A novel protocol was developed, and the elastic modulus of individual nanospherical particles was computed from AFM ‘force–distance’ mapping curves. To eliminate the tip geometry, hemispherical tungsten (W) tip was fabricated using a focused ion beam under controlled conditions and was used as an indenter. It is found that the nanospherical polypropylene (PP) particles have a higher elastic modulus compared to the bulk. The results corroborate the robustness of our experiments as the analogous results for bulk match well with the literature.

Inspec keywords: polymers; particle size; atomic force microscopy; nanoparticles; elastic moduli

Other keywords: polypropylene; elastic modulus; nanospheres; nanoparticles; AFM; mechanical properties; polymer; particle size

Subjects: Elasticity and anelasticity; Structure of polymers, elastomers, and plastics; Elasticity, elastic constants; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials

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