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The European Physical Journal E

, Volume 14, Issue 1, pp 7–16 | Cite as

Deformability of poly(amidoamine) dendrimers

  • A. Mecke
  • I. Lee
  • J. R. Baker jr.
  • M. M. Banaszak Holl
  • B. G. Orr
Article

Abstract.

Experimental data indicates that poly(amidoamine) (PAMAM) dendrimers flatten when in contact with a substrate, i.e. they are no longer spherical, but resemble flat disks. In order to better understand the deformation behavior of these branched polymers, a series of atomistic molecular dynamics simulations is performed. The resulting flattened dendrimer conformations are compared to atomic force microscopy (AFM) images of individual dendrimers at air/mica and water/mica interfaces. The ability of the polymers to deform is investigated as a function of dendrimer generation (2-5) and the required energies are calculated. Our modeling results show good agreement with the experimental AFM images, namely that dendrimers are highly flexible and capable of forming multiple interaction sites between most of their branch ends and the substrate. The deformation energy scales with dendrimer generation and does not indicate an increase in stiffness between generations 2 and 5 due to steric effects.

Keywords

Atomic Force Microscopy Molecular Dynamic Molecular Dynamic Simulation Dynamic Simulation Require Energy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  • A. Mecke
    • 1
    • 2
  • I. Lee
    • 3
  • J. R. Baker jr.
    • 2
  • M. M. Banaszak Holl
    • 4
    • 2
  • B. G. Orr
    • 1
    • 2
  1. 1.Department of Physics, Harrison M. Randall LaboratoryThe University of MichiganAnn ArborUSA
  2. 2.Center for Biologic NanotechnologyThe University of Michigan Medical SchoolAnn ArborUSA
  3. 3.Michigan Center for Biological InformationThe University of Michigan Medical SchoolAnn Arbor
  4. 4.Department of ChemistryThe University of MichiganAnn ArborUSA

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