Journal
LANGMUIR
Volume 30, Issue 24, Pages 7206-7212Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la501485e
Keywords
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Funding
- National Natural Science Foundation of China [51375255]
- International Science&Technology Cooperation Project [2011DFA70980]
- National Key Basic Research Program of China [2011CB013102]
- Foundation for Innovative Research Groups from the National Natural Science Foundation of China [51321092]
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The mechanical properties of polystyrene (PS) nanospheres of ca. 50-1000 nm in diameter were evaluated by using an atomic force microscope (AFM). The compressive elastic moduli of individual nanospheres were obtained by analyzing the AFM force-displacement curves on the basis of the Hertz and JKR contact theories. The results showed that the elastic moduli of PS nanospheres of different sizes were in the range of 2-8 GPa. The elastic modulus of PS nanospheres increased with the decrease of the sphere diameter, especially when the diameter was less than 200 nm. The measurement errors due to tip wear and the deformation at the bottom of the sphere were analyzed. Mechanisms for the size dependence on the elastic modulus of PS nanospheres were also discussed.
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