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Debye-Callaway 모델 기반 Yb(Cd1-xMgx)2Sb2 열전 합금의 격자 열전도도 분석
허민수,권승환,서원선,김상일,김현식 대한금속·재료학회 2023 대한금속·재료학회지 Vol.61 No.8
YbCd2Sb2-based Zintl phases have been identified as promising materials for thermoelectricapplications due to their high Seebeck coefficient and electrical conductivity. However, their high thermalconductivity limits their overall thermoelectric performance. To address this, Mg has recently been introducedas an alloying element at Cd atomic sites to reduce the lattice thermal conductivity of YbCd2Sb2. Zhang etal. have reported a high zT (a figure-of-merit for the thermoelectric performance) of 1.4 at 700 K inYb(Cd0.8Mg0.2)2Sb2. They have demonstrated that the high zT is due to significantly suppressed phonontransport, in other words, low lattice thermal conductivity. They attributed the significantly low latticethermal conductivity to severely distorted lattices that could not be described even with the Debye-Callawaymodel. Here, the Debye-Callaway model and Callaway-von Baeyer model have been utilized to evaluate theeffect of Mg alloying on the lattice thermal conductivity of Yb(Cd1-xMgx)2Sb2 (x = 0, 0.1, 0.2) by estimating theirtheoretical lattice thermal conductivities. We found that appropriately fitting the parameter included in thephonon relaxation rate (of the Debye-Callaway model), which represents a fractional change of bulk modulusto that of local bond length, could describe the significantly suppressed lattice thermal conductivities ofYb(Cd1-xMgx)2Sb2 (x = 0, 0.1, 0.2).
Synthesis of polyaniline/gold nanocomposites and their photothermal effects
허민수,장영욱 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Photothermal effect is a process that involved transferring the absorbed light into heat. Materials exhibiting photothermal effect include metal nanoparticles (gold, silver), carbon nanoparticles (graphene, CNT) and conducting polymers (PANI, PPy). In this study, polyaniline-gold nanocomposites were synthesized by inverse emulsion polymerization of aniline in the presence of HAuCl4, a gold precursor, using ammonium persulfate (APS) as an oxidant. FESEM-EDX and TEM analysis revealed that gold nanoparticles with 50-100 nm were formed in PANI matrix during the polymerization process. PANI exhibit temperature rising upon irradiation of near infrared light (NIR) due to its intrinsic photothermal effects, and the photothermal effect was enhanced with the increase in gold content in the PANI/gold nanocomposites. Antimicrobial effects of the nanocomposites with and without NIR irradiation were also examined.
Characterization of Acid- and Pepsin-soluble Collagens from Flatfish Skin
허민수,Jae Hyoung Lee,Hyung Jun Kim,Seong Joon Jee,Jung Suck Lee,You-Jin Jeon,김진수,Fereidoon Shahidi 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.1
Acid-soluble collagen (ASC) and pepsin-soluble collagen (PSC) from flatfish skin were characterized. The yield of PSC was 85.5%, which was higher than that of ASC at 57.3%. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) patterns showed that both the ASC and PSC were consisted of α1 and α2 chains, and β-chain. According to the results of Fourier transform infrared (FTIR) spectroscopy and hydroxylation, no difference in the helical structure between ASC and PSC was found. Thermal denaturation temperature (TDT) of flatfish skin collagen was 26.6℃ for ASC and 26.7℃ for PSC, which were similar to those of temperate fishes, while were lower compared to tropical fishes, such as the conger eel and Nile perch. There was no solubility difference between ASC and PSC at various pH and NaCl concentrations. Therefore,PSC will be preferable compared to ASC for commercial uses because of its higher yield.
향어(Cyprinus carpio)의 크기별, 부위별 및 상품성별 관능적 및 효소학적 특성 비교
허민수,김예율,최유리,박선영,송호수,최정미,김진수 한국수산과학회 2022 한국수산과학회지 Vol.55 No.1
This study was conducted to compare the sensory and enzymatic properties of Israeli carp Cyprinus carpio muscle (ICM) according to size [normal large (NLF) and small fish (NSF)], part [ventral (VM) and dorsal muscles (DM)], and commercial value [NLF, recessive (RF), or deformed fish (DF)]. There was not difference in salty of all samples. The sourness was stronger in NLF and DM than in NSF, RF, and DF, and VM, respectively. The umami of ICM showed no size-associated differences; however, those of DM, and DF and RF, were superior to those of the VM and NLF, respectively. The sweetness was also stronger in NLF than in NSF and RF, and in DM than VM. The sweetness of DF didn’t differ compared to those of NLF and RF. The intensity of fish odor was weaker in NSF or DF than that in NLF, and was higher in DM than in VM. The color of ICM was bright in NSF and DF compared to NLF. Enzyme activity was very low in the muscles and high in viscera. Therefore, ICM could be used as a material for seafood products, regardless of size, part, and commercial value; however, the issue of lipid oxidation must be considered.