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엄준혁,김현구,박세진,남창우 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Adsorbents are widely used as a method to remove oil spills from the ocean. However, secondary contamination occurs because polymer adsorbents are difficult to collect and dispose after use. In this research, magnetic nanoparticles embedded biodegradable polycaprolactone mats (PCL/MNP) were prepared via facile one-step electrospinning method. Compared with pure PCL mat, PCL/MNP mat had high oil adsorption capacity (pure PCL 21.79 g/g, PCL/MNP 0.5 20.46 g/g of Diesel), increased hydrophobicity (WCA, 146.5°), and magnetic response (magnetization, 7.7 emu/g) in aqueous phase was evaluated despite the addition of MNP. Therefore, after adsorbing oil, it can be easily removed by an external magnetic field, and even if lost, it is decomposed without environmental pollution due to biodegradability. Thus, our research gives insight into the design of oil spill sorbents as oil spill control in complex environments.
하이브리드 데시컨트 냉방과 캐스케이드 데시컨트 냉방 비교
엄준혁(Jun Hyuk Eom),최선(Sun Choi),이대영(Dae Young Lee) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
In this paper, a hybrid desiccant cooling system and a cascade desiccant cooling system, which are systems developed as a continuation of desiccant cooling technologies, are compared and analyzed. The hybrid desiccant cooling system is a system in which a conventional DC cycle is combined with a heat pump, and the evaporator of the heat pump complements the cooling output of the DC cycle. The cascade desiccant cooling system is a system in which the DC cycle is properly matched to the VC cycle, and the cooling output generated in the DC cycle condenses the refrigerant in the evaporative condenser of the VC cycle, and the condensed refrigerant is supplied to an indoor evaporator to condition air. The main difference between the two systems is based on the DC system, whether the cooling supply is by air or by refrigerant. The cascade desiccant cooling system is 30% better in energy efficiency than the hybrid desiccant cooling system, since it is cooled by refrigerant. It is also expected that the distribution of DC systems will be expanded as problems in the installation structure are resolved.
Surface Modification of Discarded Face Mask for Oil Spill Cleanup
박세진,엄준혁,김현구,남창우 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
An effective way to prevent coronavirus (COVID-19) infection is to wear a mask. Accordingly, the demand for masks is increasing, and the number of waste masks was also accelerating. The main component of masks is made of polypropylene (PP). PP has organic solvent or oil adsorption performance due to its low surface energy. In this study, the roughness of the discarded mask surface was increased by using heated solvents (heptane, hexane, and decane) to recycling the disposal mask as an oil adsorbent. According to the type of heated solvent, the crystallinity and contact angle of the mask surface was checked, and the correlation between solvent treatment time and the temperature was analyzed to suggest optimal conditions for preparing the adsorbent. The treated mask shows up to 21 times the adsorption performance of Arabian light crude oil. The produced solvent-treated mask can easily convert a waste mask that is difficult to recycle into an oil adsorbent.
A Comparison on the Empirical Power of Some Normality Tests
김대학,엄준혁,정형철 한국데이터정보과학회 2006 한국데이터정보과학회지 Vol.17 No.1
In many cases, we frequently get a desired information based on the appropriate statistical analysis of collected data sets. Lots of statistical theory rely on the assumption of the normality of the data. In this paper, we compare the empirical power of some normality tests including sample entropy quantity. Monte carlo simulation is conducted for the calculation of empirical power of considered normality tests by varying sample sizes for various distributions.
김현구,박세진,엄준혁,남창우 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
With increasing industrial oily wastewater and frequent oceanic spillage, advanced sorbent is highly demanded. Although the conventional sorbent with high specific surface area has good oil sorption capacity, its tortuous structure leads to liquid flow resistance. Inspired by wicking pathways of wood, we fabricated micron-scale aligned channel structure sorbent for fast wastewater treatment. The as-prepared sorbent was derived from delignified lignocellulosic biomass as a building block. Due to its abundant functional groups, micron-scale building blocks can assemble continuous oriented structure with intermolecular bonds. Furthermore, hydrolyzed methyltrimethoxysilane (MTMS) sol was formed hydrophobic coating layer via in-situ polysiloxane growth and provides mechanical robustness. Benefiting from these character, aligned channel structure sorbent showed fast oil contaminated water separation and good reusability with squeezing.