Skip to main content

Research Repository

See what's under the surface

A Monte Carlo study of amphiphilic dendrimers: Spontaneous asymmetry and dendron separation

Giupponi, G.; Buzza, D. M. A.

Authors

G. Giupponi



Abstract

We study via Monte Carlo simulation the conformation of amphiphilic dendrimers for which terminal monomers (t) and internal monomers (i) interact differently with the solvent (s). Specifically, we have studied g=3,6 dendrimers as a function of χit, χis, and χts (χ is the differential contact energy between the different particles) for parameter values χit=0,±1 and −1 smaller than χis, χts smaller than 1. We have allowed negative χ values in order to model attractive polar interactions (e.g., hydrogen bonding) which are believed to be important in many dendrimer/solvent systems. We find the “phase diagram” of dendrimer conformations to be extremely rich and to be a strong function of g, χis, and χts but only a weak function of χit. For χis, χts greater than 0, we observe dendrimer conformations, such as unimolecular normal micelles and inverted loopy micelles. However, for χis smaller than 0 or χts greater than 0, we observe more exotic molecular conformations, for example, the spontaneous development of asymmetry and dendron separation. These properties are analyzed in terms of snapshots as well as more quantitatively in terms of the radii of gyration, radial density profiles, pair-correlation functions, degree of asymmetry, and dendron overlap factor. By exploiting the dramatic conformational changes under different solvent conditions, we suggest the possibility of using amphiphilic dendrimers as stimuli-responsive smart materials.

Journal Article Type Article
Publication Date May 15, 2005
Journal The Journal of Chemical Physics
Print ISSN 0021-9606
Electronic ISSN 1089-7690
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 122
Issue 19
Article Number 194903
APA6 Citation Giupponi, G., & Buzza, D. M. A. (2005). A Monte Carlo study of amphiphilic dendrimers: Spontaneous asymmetry and dendron separation. The Journal of chemical physics, 122(19), doi:10.1063/1.1896347
DOI https://doi.org/10.1063/1.1896347
Publisher URL https://aip.scitation.org/doi/full/10.1063/1.1896347