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Active hydrogen repulsive polymer barrier
박민욱,정광운 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Hydrogen energy seems to be the most promising alternative energy in the future. However it is difficult to store hydrogen because it has low energy density per volume at room temperature and atmospheric pressure. The purpose of this study is to describe how the active hydrogen repulsion layer is fabricated and works. Active hydrogen repulsive polymer barrier is successfully fabricated by multi-stacking polymer layer-by-layer layers, nafion layer, platinum/palladium catalytic metal layer, and electrode layer on the poly(ethylene terephthalate) film. The most important point of the active repulsion layers is that the hydrogens are divided into the protons and electrons when they contact with catalyst layer by electrochemical reactions. The generated protons are presented in the nafion polymer electrolyte layer, on the other hand, the produced electrons are emitted through the electrode along the conductive wire. This work was mainly supported by the Human Resource Training Project for Regional Innovation and BK21 PLUS Program, Korea.
Pyrene-Based Asymmetric Dendrimer: Polymorphic Behavior of Hierarchical Superstructures
박민욱,정광운 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In order to understand the polymorphic behavior of hierarchical superstructures of asymmetric dendrimer, a pyrene-based asymmetric dendrimer (abbreviated as PM) was newly synthesized. PM exhibited the monotropic phase transition between a stable crystalline phase (K1) and a metastable crystalline phase (K2). PM formed two synclinically tilted crystalline superstructures: the 6.75 nm and 4.30 nm periodicities of layered structures for K1 and K2 phases, respectively. The stable K1 phase and metastable K2 were predominantly induced by the π-π interactions and hydrogen-bonds. UV-Vis and PL experiments indicated that the photo-physical properties of PM were directly related with their molecular packing superstructures. <sup>**</sup>This work was mainly supported by Mid-Career Researcher Program (2016R1A2B2011041), BK21 Plus program, Korea, and BRL (2015042417) of Korea.
Hierarchical striped walls constructed by the photopolymerization of discotic reactive molecule
박민욱,정광운 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
A discotic reactive molecule (abbreviated as HABET) was newly designed and synthesized as a programmed building block to construct the striped walls by the photopolymerization in the anisotropic liquid crystal (LC) solvents. On the basis of thermal, scattering and microscopic analyses, it was found that HABET formed three ordered structures: a columnar hexagonal LC phase (ΦH), a tilted columnar hexagonal LC phase (ΦT) and a highly ordered columnar oblique crystal phase (ΦOK). The microscopic molecular orientations in the hierarchical superstructures were controlled in the anisotropic LC solvents with the help of surface anchoring forces, while the dimensions of the striped wall morphologies were determined by the patterned photomasks. The long axis of self-assembled columns in the striped walls was perpendicular to the surface alignment direction regardless of the photomask direction. **This work was mainly supported by BRL (2015042417) and BK21 PLUS program, Korea.