Structure factor of DNA self-assembled hydrogels at the percolation threshold
Recent SANS experiments have permitted the investigation of the structural properties of DNA Nanostars (NS), i.e. self-assembled DNA structures with a limited valence, f [1]. Both the F(Q) of DNA NS and the S(Q) of the resulting gels that these NS form on cooling were characterized thanks to the synergy between SANS studies and simulations [2]. Recent DLS measurements suggest that is possible to use DNA NS as a model-system for investigating in a controlled way the percolation transition and the cross-over from chemical to physical gelation, exploiting the strong T-dependence of the base-pair interaction free-energy. We have experimentally realized a system composed by a mixture of DNA chains (f=2) and DNA NS (f=4) in which the only relevant interaction is between particles with different valence thanks to the proper design of the sticky-ends. By tuning the A/B ratio, it is possible to bring the system at a well defined distance from percolation. Complementing the DLS results, SANS measurements of the S(Q) will allow to characterize the fractal dimension associated to the percolating cluster providing important information about the gelation process of the DNA NS.
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SCIORTINO Francesco; COMEZ Lucia; Javier Fernandez-Castanon; Alessandro Paciaroni; PORCAR Lionel and M. Zanatta. (2018). Structure factor of DNA self-assembled hydrogels at the percolation threshold. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-13-715
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