Yun‐Ho Ahn
KAIST 환경학과 · 환경과학
Yun-Ho Ahn 교수의 연구실은 클래쓰레이트 수화물의 구조 제어와 에너지 저장 응용을 핵심으로 삼고 있습니다. 특히 수소를 포함한 기체 혼합수화물의 빠른 형성, 나노스케일 구조 내의 게스트-호스트 상호작용 조절, 그리고 입자 조사에 의한 수화물의 전자적·열역학적 안정성 향상에 초점을 맞추고 있습니다. 이는 수소 에너지 저장 및 방사선 조작을 통한 물질 설계의 새로운 가능성을 탐색하는 연구입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
This work introduces a “hydrate seed solution”, a surfactant solution containing pre-constructed structure II (sII) hydrate crystals, for the rapid formation of hydrogen-enriched hydrocarbon mixed hydrates. We observed the instantaneous nucleation and fast growth of mixed gas hydrates for both CH4–H2 and C2H6–H2 mixtures with the cyclopentane (CP) hydrate seed. The CP hydrate seed, which is immiscible with water, dominantly induces the growth of CH4–H2 and C2H6–H2 mixed gas hydrates with thermod
Can we create even more “plenty of room at the bottom” of the confined nanospaces in clathrate hydrates by tuning the complex interactions between the host water frameworks and guest molecules? Because the lattice of the clathrate hydrate is stabilized by van der Waals forces between the host and guest, irradiating the lattice of the clathrate hydrate with energetic particles is anticipated to introduce artificial defects on the host water molecules, resulting in creating a better occupation of
This study characterized new structure II (sII) clathrate hydrates, consisting of 136 H<sub>2</sub>O molecules with 8 large 5<sup>12</sup>6<sup>4</sup> cages and 16 small 5<sup>12</sup> cages, with methacrolein for the first time.
Acyclic hydrocarbon molecules favor the gauche or cis conformation, which are more stable in terms of molecular geometry when they are enclathrated in clathrate hydrates. Once they are captured, they maintain their conformations in the hydrate cavities. However, on the basis of Raman spectra and density functional theory (DFT) calculations, we observed conformational changes of an acyclic guest molecule (3-buten-2-one) occurring in the hydrate cavities induced by intercavity electron transfer af
The structural determination of clathrate hydrates, nonstoichiometric crystalline host-guest materials, is challenging because of the dynamical disorder and partial cage occupancies of the guest molecules. The application of direct space methods with Rietveld analysis can determine the powder X-ray diffraction (PXRD) patterns of clathrates. Here, we conducted Rietveld analysis with the direct space method for the structural determination of binary tetrahydrofuran (THF) + O2 and 3-hydroxytetrahyd
