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UV light triggered self-healing of ZnO-Graphene quantum dots-thermoplastic polyurethane composites
안석훈 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The need of developing self-healing materials in coatings or paints now dramatically increases because scratches or cracks formed on surface of protecting materials dramatically accelerate corrosion of the substrate. Here, we report UV light induced self-healing composites fabricated with zinc oxide nano particles covered by graphene (ZnO-G) and polyurethane (PU). The composite films were fabricated through a simple mechanical mixing, followed by removing solvent. In order to examine self-healing ability, the films were scratched by blade and irradiated under UV. The change in crack size and shape was monitored using optical microscope before and after UV irradiation. The damaged area was healed in composites after UV irradiation through a photothermal effect whereas there was little change in cracks for pure PU films and the self-healing ability increased as the fraction of ZnO-G increased.
Two-dimensional Organic Self-assemlies for Graphene Applications
안석훈 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
As early as 1961 it was reported, through calorimetric measurements that alkanes would spontaneously assemble into ordered arrays on suitable substrates. Great advances in the study of their structures were later achieved by the application of scanning tunneling microscopy (STM) to these molecular adsorbates physisorbed at the liquid/solid interface. The self-assembled structures of various organic molecules could be useful for graphene applications such as electronics, barrier films, and sensors. In this presentation, self-assembled structures of alkane molecules on graphene would be discussed.