Figure. 2. Several typical nanoparticle models. A. Rigid nanoparticles, reproduced from Reference81 with permission from The Royal Society of Chemistry. B. Soft matter nanoparticles, reproduced from Reference84 with permission from Copyright © 2010, American Chemical Society. C. Nanoparticles with controllable elastic modulus, reproduced from Reference26 with permission from The Royal Society of Chemistry.