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Jisu Jeong,오동기,Munju Goh 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Polyurethane foam (PUF) is formed by reacting sugar, propolis, and polyisocyanate, and then blowingwith CO2, formed by reacting polyisocyanate with water. An optimum foaming rate of 1440% was foundfor 15 wt.% of sugar and 20 wt.% of propolis, and the synthesis and cell structure of polyurethane wereanalyzed by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Under the optimized conditions, the apparent density and thermal conductivity of the PUF-containingpropolis were 0.04 – 0.147 g/mL and 0.028 – 0.029 W/(mK), respectively. The bacterial reduction ratewas 92.7% in the PUF containing 20 wt.% propolis. PUF can be broken down by enzymatic reactions inwater using invertase. The degradation reaction of invertase was kinetically analyzed. This study showedthat eco-friendly polymers can be synthesized using sugar and propolis and decomposed throughantibacterial activity and enzymatic green recycling.
Hollow Au nanoparticles-decorated silica as near infrared-activated heat generating nano pigment
Jisue Kim,Chulhwan Park,Younghun Kim 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
The photothermal effect resulting from the local surface plasmon phenomenon of metal nanoparticles isessentially a light–heat conversion mechanism, wherein the heat is generated around the nanoparticlesowing to the absorption of light by the nanoparticles. A pigment exhibiting the photothermal effect canbe used as a multifunctional nano-pigment providing high heat energy from a small amount of lightenergy as well as a bright color. In this study, a grayish blue nano-pigment (GBNP) was synthesized usingsilica nanoparticles and hollow Au nanoparticles that exhibited a relatively high photothermal effect inthe near-infra red (NIR) region. By irradiating light in the NIR region, GBNP could selectively producestable thermal energy with a photothermal efficiency of 39%. It was mixed with paint to confirm its applicabilityto pigments and heat-generation performance. The surface of paint containing 4 wt% GBNP wasincreased to 110 C, exhibiting a stable heat-generation performance under both repeated and continuousNIR irradiation. Furthermore, the thermal energy generated due to the photothermal effect impliedthe high evaporation efficiency of water droplets on the surface. This pigment might be utilized in applicationswhere a selectively high temperature needs to be maintained continuously for bacterial-growthprevention and moisture control.
Immobilization of phenol-containing compounds via electrochemical activation of a urazole derivative
Jisu Kim,Noo-ri Kim,김승우,김영관,여운석 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.2
We introduce an efficient method for the immobilization of phenolic compounds, based on 1,2,4,-triazoline-3,5-dione (TAD), which selectively reacts with phenolic compounds at the α position to the phenolic hydroxyl group, ensuring intact phenol functionality, and therefore, maintaining the biological activity of the phenolic compound. We prepared self-assembled monolayers on gold that presented urazole (the reduced form of TAD) as the terminal group and which were activated electrochemically without treatment with chemical oxidants, allowing on-demand activation and in situ immobilization of the phenolic compounds. We examined the immobilization of various phenolic compounds and verified the surface chemistry using electrochemistry and mass spectrometry. The proposed method is simple and straightforward and does not require complicated protocols and reagents, and thus, it can be a general and practical platform for the immobilization of phenol-containing molecules on the surfaces of various materials.
Jisu Kim,Young Sang Kwon,Dong-Won Bae,Youn-Sig Kwak 한국식물병리학회 2020 Plant Pathology Journal Vol.36 No.2
Streptomyces griseus S4-7, a well-characterized key- stone taxon among strawberry microbial communi- ties, shows exceptional disease-preventing ability. The whole-genome sequence, functional genes, and bioactive secondary metabolites of the strain have been described in previous studies. However, proteomics studies of not only the S4-7 strain, but also the Streptomyces genus as a whole, remain limited to date. Therefore, in the pres- ent study, we created a proteomics reference map for S. griseus S4-7. Additionally, analysis of differentially expressed proteins was performed against a wblE2 mu- tant, which was deficient in spore chain development and did not express an antifungal activity-regulatory transcription factor. We believe that our data provide a foundation for further in-depth studies of functional keystone taxa of the phytobiome and elucidation of the mechanisms underlying plant-microbe interactions, es- pecially those involving the Streptomyces genus.
The early silkroad brought KyungGeum from GoJoseon
( Jisu Kim ),( Youngjoo Na ) 한국감성과학회 2021 추계학술대회 Vol.2021 No.0
Silk KyungGeum pieces of 5th century BC which were found in the West and Xingjiang are regarded as those from GoJoseon of Korea. Silk, fur, and high-quality iron had been exported together in 5-6th century BC in the West. In this period, China, which has been at war for hundreds of years across the country, would not have been able to export high-quality iron. It is certain that the silk fabrics and good irons were exported from GoJoseon, which had been peaceful for hundreds of years. This is because GoJoseon, which served as the religious and spiritual pillar of neighboring countries, was a prosperous country for a thousand years.