Highly Stiff and Stretchable DNA Liquid Crystalline Organogels with Super Plasticity, Ultrafast Self-Healing, and Magnetic Response Behaviors.

Abstract

DNA-based gels are attractive materials as they allow intuitive rational design, respond to external physicochemical stimuli, and show great potential for biomedical applications. However, their relatively poor mechanical properties currently limit their technological application considerably as the latter requires mechanical integrity and tunability. With this work, a DNA organogel is reported that gels through supramolecular interactions, which induce mesophase ordering, and that exhibits exceptional stretchability, deformability, plasticity, and biocompatibility. Moreover, the nature of the supramolecular bond enables complete self-healing within 3 s. Most importantly, the DNA-based liquid crystalline organogels exhibit impressive ultimate tensile strengths above 1MPa, stiffness higher than 20MPa, and toughness up to 18MJ m-3 , rendering these materials the strongest among reported DNA networks. In addition, the facile access is demonstrated to composite DNA materials by blending magnetic nanoparticles with the organogel matrix giving access to magnetic field induced actuation. It is believed that these findings contribute significantly to the advancement of DNA gels for their use in smart materials and biomedical applications.