다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

https://pr.ibs.re.kr/bitstream/8788114/3718/1/Recent%20development_Materials%20Today_Young%20Hee%20Lee.pdf

Recent Development of Two-Dimensional Transition Metal Dichalcogenides and Their Applications

Advanced polyimide materials: Syntheses, physical properties and applications

Oil spills and industrial organic pollutants have induced severe water pollution and threatened every species in the ecological system. To deal with oily water, special wettability stimulated materials have been developed over the past decade to separate oil-and-water mixtures. Basically, synergy between the surface chemical composition and surface topography are commonly known as the key factors to realize the opposite wettability to oils and water and dominate the selective wetting or absorption of oils/water. In this review, we mainly focus on the development of materials with either super-lyophobicity or super-lyophilicity properties in oil/water separation applications where they can be classified into four kinds as follows (in terms of the surface wettability of water and oils): (i) superhydrophobic and superoleophilic materials, (ii) superhydrophilic and under water superoleophobic materials, (iii) superhydrophilic and superoleophobic materials, and (iv) smart oil/water separation materials with switchable wettability. These materials have already been applied to the separation of oil-and-water mixtures: from simple oil/water layered mixtures to oil/water emulsions (including oil-in-water emulsions and water-in-oil emulsions), and from non-intelligent materials to intelligent materials. Moreover, they also exhibit high absorption capacity or separation efficiency and selectivity, simple and fast separation/absorption ability, excellent recyclability, economical efficiency and outstanding durability under harsh conditions. Then, related theories are proposed to understand the physical mechanisms that occur during the oil/water separation process. Finally, some challenges and promising breakthroughs in this field are also discussed. It is expected that special wettability stimulated oil/water separation materials can achieve industrial scale production and be put into use for oil spills and industrial oily wastewater treatment in the near future.

Biomimetic super-lyophobic and super-lyophilic materials applied for oil/water separation: a new strategy beyond nature

In vivo tissue response and degradation behavior of PLLA and stereocomplexed PLA nanofibers.

Two dimensional (2D) layered materials have recently attracted significant research interest owing to their unique physical and chemical properties for efficient electrochemical energy storage devices. Here, we present a neoteric approach to fabricate high performance MoS2 thin film supercapacitor electrodes by using a direct magnetron sputtering technique. The novel three-dimensional (3D) porous structure of the MoS2 film exhibits an excellent capacitance of ∼330 F cm−3 along with a high volumetric power and energy density of 40–80 W cm−3 and 1.6–2.4 mW h cm−3, respectively. Moreover, the optimized MoS2 electrode shows an outstanding cyclic stability, yielding capacitance retention over 97% after 5000 cycles of charging/discharging. The contemporary approach to MoS2 supercapacitor electrode fabrication will enable new opportunities in flexible electronic and energy devices.

Directly deposited MoS2 thin film electrodes for high performance supercapacitors

http://mslab.polymer.pusan.ac.kr/english/international/2007/134.pdf

Quantitative analysis of unknown compositions in ternary polymer blends: A model study on NR/SBR/BR system

In-situ formation of the hydroxyapatite/chitosan-alginate composite scaffolds

Materials with superhydrophobic and superoleophilic properties are exhibited naturally in lotus leaves. Inspired by lotus leaves, lotus leaf (LL) powder was used in this study to prepare a new type of bio-inspired, multi-purpose, environmental friendly and inexpensive instant superhydrophobic–superoleophilic hybrid. The cast hybrid surface exhibited almost complete superhydrophobicity (water contact angle (CA) > 175°) on a variety of substrates and superoleophilicity (oil CA < 5°) for various oils. The surface also exhibited excellent thermal stability and mesoporous structure, and became superhydrophilic on curing at 600 °C. A dip coated hybrid–poly(dimethylsiloxane) (PDMS) sponge exhibited very high selectivity and absorption capacity for a range of oils and organic solvents (2000 to 3600 w/w% to absorbent) in deionized water.

Won-Ki Lee

Papers

In vivo tissue response and degradation behavior of PLLA and stereocomplexed PLA nanofibers.

Directly deposited MoS2 thin film electrodes for high performance supercapacitors

Quantitative analysis of unknown compositions in ternary polymer blends: A model study on NR/SBR/BR system

In-situ formation of the hydroxyapatite/chitosan-alginate composite scaffolds

Bio-inspired, multi-purpose and instant superhydrophobic–superoleophilic lotus leaf powder hybrid micro–nanocomposites for selective oil spill capture