Stability of amphiphilic dendrimers at the water/air interface

Selina Nawaz, Paola Carbone

    Research output: Contribution to journalArticlepeer-review

    Abstract

    By means of atomistic molecular dynamics simulations, we investigate the structure and stability of alkyl-modified polyamido-amide (PAMAM) dendrimers at the air/water interface as a function of the number and the relative position of the modified end groups. We find that the PAMAM dendrimer with all terminal groups functionalized is more stable at the interface than the Janus dendrimer where only half the amine groups are modified. This result is explained in terms of softness of the dendrimer molecule which adapts its conformation to maximize the favorable amide-water contacts segregating the alkyl chains and increasing the structural order of the "hydrophilic core". We interpret the stability of the molecule at the interface also in terms of particle wettability and energy components. We verify that the atomistic model follows the prediction of the thermodynamic analytical theory adopting an oblate or prolate shape and orientating its longest axis parallel to the normal to the interface. These results indicate that monolayers of fully functionalized molecules could be as stable as (or more stable than) those self-assembled from proper Janus molecules. © 2011 American Chemical Society.
    Original languageEnglish
    Pages (from-to)12019-12027
    Number of pages8
    JournalJournal of Physical Chemistry B
    Volume115
    Issue number42
    DOIs
    Publication statusPublished - 27 Oct 2011

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