• 한국축산식품학회지
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• 제37권3호
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• pp.376-384
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• 2017

The objective of this study was to investigate the effect of using gelled emulsion (olive oil 46%, inulin 9%, gelatin 3%) as fat replacer on some quality parameters of chicken patties. For this purpose GE, prepared with olive oil, gelatin and inulin was replaced with beef fat at a level of 0%, 25%, 50%, 100% (C, G25, G50, G100). In this study syneresis, thermal stability, centrifuge and creaming stability of gelled emulsion were analyzed. Chemical composition, technological paramerers (cooking yield, water holding capacity, diameter reduction, fat and moisture retention) and textural and sensory properites were evaluated in comparision to control patties. High thermal stability was recorded in GE (93%), also creaming stability results showed that GE protected its stability without any turbidity and separation of the layer. The complete replacement of beef fat with GE showed detrimental effect on all investigated cooking characteristics except fat retention. Replacement of beef fat with GE at a level of 50% resulted similar cooking characteristics with C samples. Color parameters of samples were affected by GE addition, higher CIE $b^*$ values observed with respect to GE concentration. The presence of GE significantly affected textural behaviors of samples (p<0.05). Our results showed that GE prepared with inulin and olive oil is a viable fat replacer for the manufacture of chicken patty.

• 한국전기전자재료학회논문지
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• 제21권12호
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• pp.1130-1134
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• 2008

Thermal and electrochemical properties were discussed with tris(2,4,6-trimethoxyphenyl)Phosphine (TTMPP) as a flame retradant additive for Li-ion battery. TTMPP showed excellent thermal stability with charged cathodes. Addition of 1 wt.% of the additive to the electrolyte improved the thermal stability without damaging the performance of the battery. The oxygne evolution reaction delayed nearly by $60^{\circ}C$. The capacity retention ratio in cycle life tests of the battery with 1 wt.% TTMPP was slightly improved comparing to the no additive cells.

• Journal of the Korean Physical Society
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• 제73권11호
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• pp.1787-1793
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• 2018

The power conversion efficiency of perovskite solar cells has reached 23.3%. Although significant developments have been made through intensive studies, the stability issue is still challenging. Passivation of perovskite solar cells with a transparent polymer provides better stability; however, there are a few disadvantages of organic polymer such as low thermal stability, weak adhesion and the lack of water retention ability. In this work, we prepared a dual Parylene-F/C layer with 3-methacryloxypropyltrimethoxysilane, A-174, to combine the advantages of organic and inorganic materials. As a result, A-174 treated dual Parylene-F/C layer demonstrated improved passivation effects compared to a single Parylene layer due to the strong binding of Parylene and the water retention ability by $SiO_2$ formed from A-174. This synergetic effects can be expanded to the combination of other organic materials and organosilane compounds.

• 한국전기전자재료학회논문지
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• 제35권3호
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• pp.246-254
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• 2022

Localized heat can be generated using electrically conductive word-lines built into a 3D NAND flash memory string. The heat anneals the gate dielectric layer and improves the endurance and retention characteristics of memory cells. However, even though the electro-thermal annealing can improve the memory operation, studies to investigate material failures resulting from electro-thermal stress have not been reported yet. In this context, this paper investigated how applying electro-thermal annealing of 3D NAND affected mechanical stability. Hot-spots, which are expected to be mechanically damaged during the electro-thermal annealing, can be determined based on understanding material characteristics such as thermal expansion, thermal conductivity, and electrical conductivity. Finally, several guidelines for improving mechanical stability are provided in terms of bias configuration as well as alternative materials.

• Journal of Ceramic Processing Research
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• 제13권spc2호
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• pp.308-311
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• 2012

A wide range of possible hazards existing in thermal batteries are mainly caused by thermal runaway, which results in overheating or explosion in extreme case. Battery separators ensure the separation between two electrodes and the retention of ion-conductive electrolytes. Thermal runaways in thermal batteries can be significantly reduced by the adoption of these separators. The high operating temperature and the violent reactivity in thermal batteries, however, have limited the introduction of conventional separators. As a substitute for separators, MgO powders have been mostly used as a binder to hold molten salt electrolyte. During recent decades the fabrication technology of ceramic fiber, which has excellent mechanical strength and chemical stability, has undergone significant improvement. In this study we adopted wet-laid nonwoven paper making method instead of the electrospinning method which is costly and troublesome to produce in volume. Polymeric precursor can readily be coated on the surface of wet-laid ceramic paper, and be formed into ceramic film after heat treatment. The mechanical strength and the thermo-chemical stability as well as the wetting behaviors of ceramic separators with various molten salts were investigated to be applicable to thermal batteries. Due to their excellent chemical, mechanical, and electrical properties, wet-laid nonwoven separators made from ceramic fibers have revealed positive possibility as new separators for thermal batteries which operate at high temperature with no conspicuous sign of a short circuit and corrosion.

• Journal of Electrochemical Science and Technology
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• 제10권2호
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• pp.196-205
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• 2019

Ni-rich layered oxides $Li(Ni_xCo_yMn_z)O_2$ (x + y + z = 1) have been extensively studied in recent times owing to their high capacity and low cost and can possibly replace $LiCoO_2$ in the near future. However, these layered oxides suffer from problems related to the capacity fading, thermal stability, and safety at high voltages. In this study, we use surface coating as a strategy to improve the thermal stability at higher voltages. The uniform and conformal $Al_2O_3$ coating on prefabricated electrodes using atomic layer deposition significantly prevented surface degradation over prolonged cycling. Initial capacity of 190, 199, 188 and $166mAh\;g^{-1}$ is obtained for pristine, 2, 5 and 10 cycles of ALD coated samples at 0.2C and maintains 145, 158, 151 and $130mAh\;g^{-1}$ for high current rate of 2C in room temperature. The two-cycle $Al_2O_3$ modified cathode retained 75% of its capacity after 500 cycles at 5C with 0.05% capacity decay per cycle, compared with 46.5% retention for a pristine electrode, at an elevated temperature. Despite the insulating nature of the $Al_2O_3$ coating, a thin layer is sufficient to improve the capacity retention at a high temperature. The $Al_2O_3$ coating can prevent the detrimental surface reactions at a high temperature. Thus, the morphology of the active material is well-maintained even after extensive cycling, whereas the bare electrode undergoes severe degradation.

• 한국식품과학회지
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• 제53권4호
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• pp.365-374
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• 2021

본 연구에서는 커큐민 함유 에멀션의 안정성을 위해 필드하이드로젤로 쌀전분(RS), 1시간 효소처리한 전분(1GS), 24시간 효소처리한 전분(24GS), 96시간 효소처리한 전분(96GS)을 사용하였으며 이를 이용한 모델 프리믹스로 커큐민 탑재 필드하이드로젤 분말(FHP)을 제조하여 탑재된 커큐민의 안정성 및 in vitro 소화 후 커큐민 보유율의 변화를 관찰하였다. FHP는 커큐민 함유 에멀션분말(EMP)과 비교하여 재분산시 크리밍 현상없이 분산안전성을 보여주었다. 재분산 하이드로젤은 고온에서 녹으면서 오히려 액적(droplet)의 유착(coalescence)과 응집(flocculation)이 가속화되어 에멀션에 비해 열안정성이 떨어졌으나 UV 안정성은 RS-FHP와 1GS-FHP에서 유의적인 커큐민 보호 효과를 나타냈다. GS-FHP는 in vitro 소화 중 기름방울의 응집 및 유착이 발견되지 않았으며 소화 후 에멀션의 유상에 용해된 커큐민을 성공적으로 보호함을 확인하였다. 따라서, GS-FHP는 분말형태 프리믹스 개발에 새로운 소재로 사용 가능할 것이며 커큐민 외에 다른 다양한 소수성 기능성물질에 대해서도 적용을 확장할 수 있을것으로 생각된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.356.2-356.2
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• 2014

Spin Transfer Torque (STT) is of great interest in data writing scheme for the Magneto-resistive Random Access Memory (MRAM) using Magnetic Tunnel Junction (MTJ). Scalability for high density memory requires ferromagnetic electrodes having the perpendicular magnetic easy axis. We investigated CoZr as the ferromagnetic electrode. It is observed that interfacial magnetic anisotropy is preferred perpendicular to the plane with thickness dependence on the interfaces with Pt layer. The anisotropy energy (Ku) with thickness dependence shows a change of magnetic-easy-axis direction from perpendicular to in-plane around 1.2 nm of CoZr. The interfacial anisotropy (Ki) as the directly related parameters to switching and thermal stability, are estimated as $1.64erg/cm^2$ from CoZr/Pt multilayered system.

• 멤브레인
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• 제19권1호
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• pp.63-71
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• 2009

본 연구에서는 연료전지용 전해질 복합체용 지지체 막을 저가의 우수한 기계적 열적 안정성을 가지는 Polysulfone으로 상전이 법을 이용하여 제조하였다. 제조된 막을 이용하여 농도변화와 노출시간의 변화에 따른 열 수축율, 통기도, 모폴로지, 기계적 물성 및 다공도를 측정하였다. 모폴로지를 조절하기 위해 공기 중 노출 시간과 고분자 농도가 제어되었으며, 제조된 막은 고분자 농도 변화에 관계없이 모두 스폰지 구조를 나타내었다. 고분자의 농도가 증가함에 따라 기계적 열적 안정성은 증가하였지만, 다공도는 감소하는 결과를 보였다. 실험결과 20 wt%의 PSf 고분자 용액을 사용하여 2분의 노출시간을 두고 제조된 고분자 막에서 연료전지용 복합막으로 사용되기 위한 충분한 다공도(80%)와 기계적(tensile : 1.3 MPa), 열적(MD, TD shrinkgage < 1%) 안정성을 나타내었다.

• 한국지반공학회논문집
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• 제39권11호
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• pp.53-62
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• 2023

동결토의 부동수분특성은 지반의 열-수리-역학적 거동 전반에 걸쳐 지배적인 영향을 미치며, 동결 지반의 안정성 평가를 위해서는 대상 지반재료의 부동수분특성에 대한 면밀한 검토가 필요하다. 본 연구에서는 간극수 염분농도를 고려한 동결 사질토의 부동수분곡선을 평가하기 위하여 흙의 어는점 및 부동수분을 측정하는 실내 실험을 수행하였으며, 계측된 실험데이터를 기반으로 부동수분포화도 곡선을 간편하게 추정할 수 있는 경험적 모델을 새롭게 제시하였다. 또한, 제안된 경험적 모델을 입력자료로 적용한 해석모델의 시뮬레이션 결과를 실험데이터와 비교함으로써 사용된 부동수분곡선의 적정성을 검증하였다.