Dong Soo Hwang

Lithium-sulfur (Li-S) batteries are promising next generation batteries, and numerous porous carbons have been considered as the support materials for sulfur to address dissolution of poylsulfide. However, the weak binding energy of carbon with sulfur species causes poor cycle performance. We report that amine- and hydroxyl-rich biopolymer (chitosan) coated on ordered mesoporous carbon (OMC) can effectively capture soluble polysulfide. The strong binding of chitosan’s amine- and hydroxyl-group w

Interconnected ruthenium dioxide nanoparticles (RuO2NPs) anchored graphite oxide nanocatalyst(RuO2/GO) with good BET surface-area (285 m2/g) was prepared. Under feasible reaction conditions, theRuO2/GO worked well for oxidative synthesis of imines. The RuO2/GO catalyzed a broad range of aminesincluding less reactive aliphatic amines in good yields (98–58%) with excellent selectivity (100%). This isthe most efficient RuO2-based nanocatalyst for the synthesis of imines among those reported to date

Successful adhesion on wet surfaces is one of the most important challenges in biomedical engineering. Marine fouling organisms exhibit effective adhesion for wet substrates, and the measurement of adhesion forces inwet conditions is the first step toward mimicking the smart strategies of the marine organisms. Surface forces apparatus(SFA) is one of the most powerful nanomechanical tools used to directly measure time- and distance-dependent interactionsbetween biological macromolecules or biolog

Endurable coating on biomedical substrates is one of the most important issues in biomedical engineering field. Recently, a robust yet reversible coating has found in the cuticle of mussel byssus and the mimicking of the mussel cuticle coating has been considered as a strategy to build up endurable coating on biomedical materials. To date, the only known protein in the cuticle is mussel foot protein-1 (fp-1). To form endurable and bioactive coating on the biomedical surface, the fusion protein o

Coralline algae, the algal whitening phenomenon-causing seaweeds, are characterized by calcareous deposits in the cell wall. The viability of the coralline algae Lithophyllum yessoense and Corallina pilulifera was quantitated using a triphenyltetrazolium chloride assay and eight calcification inhibitors. Among these inhibitors, ferric citrate showed the strongest inhibition of coralline algae viability. The concentrations of ferric citrate conferring 50% inhibition were 1.7 and 3.8 mM for L. yes

The disappearance of seaweed flora in some rocky areas, which is known as algal whitening, barren ground, coralline flats, or deforested areas, is associated with some species of coralline algae. To determine the biological characteristics of a representative species of crustose coralline alga, the 18S rDNA gene was sequenced to identify the genus Lithophyllum. According to its morphological and distributional characteristics, it was deduced to be L. yessoense. Viability was measured using triph

In nature, marine mussels (Mytilus edulis) suffer less fouling colonization on the newly formed sides of their shells. Using settlement assays with algal spores of Porphyra suborbiculata, we determined that spore attachment and germination on the periostracum decreased to 36.8 and 3.3 %, respectively. Additionally, the spore settlement was considerably diminished by periostracum dichloromethane extracts containing 19 % oleamide, a major antifouling compound. A scanning electron micrograph of the

Due to their environmental friendliness, woodbased biomass pellets are widely used as conventional fuel sources in daily life and in various industries. Durability and proper mechanical strength are important quality factors for practical applications of biomass pellets as they enable their easy handling, transportation, and storage. In the present study, to increase mechanical strength of sawdust biomass pellet fuels, sucrose was employed as a main binder material. In addition, calcium ions wer

This study was conducted to analyze the difference in mechanically improved properties by distinguishing α-chitin and β-chitin for Poly(L-lactic acid)(PLLA). First, dissolution of chitins was established by mixing polar solvents hexafluoroisopropanol (HFIP) and trifluoroacetic acid (TFA) in appropriate proportions. Under these conditions, the dissolved chitin was used for electrospinning with other polymers. The electrospun nanofibers of the PLLA and chitins were successfully produced. Compared

We introduce a three-dimensional Fourier transform light scattering (3D FTLS) method to reconstruct extended angle-resolved light scattering (ARLS) spectra from individual spherical particles. Conventional FTLS is limited by the numerical aperture of an optical system. By acquiring scattered optical fields from multiple illumination angles and synthesizing them on an Ewald sphere in Fourier space, 3D FTLS extends the ARLS range beyond 90°. We validate the method through simulations and experimen

Lithium-ion batteries (LIBs) currently dominate the commercial rechargeable battery market due to their high ionic conductivity and moderate compatibility. To enhance the development and safety of future LIBs, ionic liquids (ILs) have been introduced as additives. For the fi rst time, we present the Lewis acid/base responses of nine ILs in terms of donor number (DN), calculated using 7 Li NMR spectroscopy. The anionic component of the ILs signifi cantly infl uences the DN through its interaction

Plant biomass-derived polymeric materials such as cellulose nanofibrils (CNF), cellulose nanocrystals (CNC), and lignin have been widely assessed by life-cycle assessment (LCA) as low-carbon alternatives to fossil-based polymers. Yet, despite numerous LCAs of these processed biomaterials, their parent structure—lignocellulosic pulp (LC)—has rarely been quantified as a standalone material, leaving its comparative performance unclear. Here, we address this gap with three aligned LCA analyses compr