Model for Assembly and Gelation of Four-Armed DNA Dendrimers

Details Model for Assembly and Gelation of Four-Armed DNA Dendrimers Model for Assembly and Gelation of Four-Armed DNA Dendrimers

2005-12-12

arxiv.org/abs/cond-mat/0512260v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1088/0953-8984/18/26/L02

We introduce and numerically study a model designed to mimic the bulk behavior of a system composed of single-stranded DNA dendrimers. Complementarity of the base sequences of different strands results in the formation of strong cooperative intermolecular links. We find that in an extremely narrow temperature range the system forms a large-scale, low-density disordered network via a thermo-reversible gel transition. By controlling the strand length, the gel transition temperature can be made arbitrarily close to the percolation transition, in contrast with recent model systems of physical gelation. This study helps the understanding of self-assembly in this class of new biomaterials and provides an excellent bridge between physical and chemical gels.

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