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- 저자 : 이규원 (검색결과 673 건)
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2P-144 : Superhydrophobic coatings based on fluorinated polyaniline nanoparticles
이규원,백승훈,장영욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Fabrication of polymeric superhydrophobic surfaces, non-wettable surfaces with high water contact angles (WCAs) and facile sliding of drops, have attracted tremendous attentions in recent years. Adding nanoparticles to a low surface energy polymer has been regarded as effective method to obtain the superhydrophobic surfaces. In this study, fluorinated polyaniline nanoparticles were used to fabricate the superhydrophobic coatings. The surface fluorinated polyaniline particles were synthesized by oxidative polymerization of aniline in aqueous medium and a subsequent surface functionalization of the nanoparticle with 1H,1H,2H,2H-perfluorodecanethiol via a thiol-ene addition. Coated surfaces obtained by spray coating of a mixture consisting of PTMG, fluoro alcohol, the PANI NPs, and polyisocyanate as a curative, showed contact angles of 153° for water. Moreover, the superhydrophobic coatings also showed excellent mechanical and chemical durability under harsh conditions.
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Quantum valley Hall state in gas molecule-adsorbed bilayer graphene
이규원,이철의 한국물리학회 2016 Current Applied Physics Vol.16 No.2
While a variety of topologically nontrivial insulator phases have been predicted to arise from electronelectron and spin-orbit interactions in bilayer graphene, the trigonal warping of conduction and valence bands leads to a (semi)metallic band structure. An electrostatic potential difference between the two layers due to an external electric field is known to open a bandgap, leading to a topologically nontrivial insulator state. A bandgap may also arise from gas molecules adsorbed on bilayer graphene, implying a topologically nontrivial insulator phase. Here, our density functional theory calculations show that bilayer graphene adsorbing gas molecules is a quantum valley Hall insulator. Thus, adsorption of weak donor (or acceptor) molecules with a large electric dipole moment may be instrumental to realize a topologically nontrivial insulator phase in bilayer graphene even without external electric field.
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이규원,이철의 한국물리학회 2017 Current Applied Physics Vol.17 No.10
We have investigated topological confinement effects of edge potentials on gapless edge states in zigzagedge graphene nanoribbons (ZGNRs) under a staggered bulk potential. A variety of gapless edge states were predicted with the concept of topological confinement effect alone, which was confirmed by using tight-binding model calculations. Half-metallicity of ZGNR, which has been semiclassically described, was revealed to fundamentally result from a topological confinement effect. Edge potentials were found to allow an infinitesimal staggered bulk potential to result in gapless edge states, regardless of the ribbon width. A uniform or staggered potential applied to the boundary region narrower than a critical width was found to play a role of the edge potentials, and the critical width was estimated.
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