립스틱에서 DSC를 이용한 최대결합수량에 관한 연구

최기환 ( Khee Hwan Choi ),안명진 ( Myung Jin Ann ),손홍하 ( Hong Ha Son ),김경섭 ( Kyong Seub Kim ),이상민 ( Sang Min Lee ),정지희 ( Ji Hee Jeong ) 대한화장품학회 2012 대한화장품학회지 Vol.38 No.3

보습제 베이스를 립스틱에 사용하여 보습효과가 우수한 제품개발에 응용하고자 DSC에 의한 결합수형성능, 수분보유능을 고찰하였다. 보습제 베이스를 배제한 견본에서 결합수 형성능은 5.12 %임을 알았다. 보습제 베이스함량에 따른 결합수형성능을 측정한 결과 보습제 베이스 함량이 증가함에 따라 결합수 형성능이 비례적으로 증가함을 DSC측정결과 알았다. 한편 DSC측정결과와 in vitro 수분보유능 측정법을 비교 실험한 결과 유사한 경향을 나타냄을 알 수 있었다. 따라서 DSC에 의한 결합수 형성능 측정법은 앞으로 립스틱 제품의 보습효과를 예측 하는데 유용한 방법으로 생각 되었다. To develop lipstick products with superior moisturizing effect using moisture base, bound water capacity and water holding capacity were investigated by DSC. Bound water capacity of the lipstick sample excluding moisture base is found to be 5.12 %. DSC measurement showed that bound water capacity and the concentration of moisture base were positively correlated. Additionally, DSC measurements and in vitro effective water holding capacity measurement showed similar patterns. Therefore, measuring of bound water capacity by DSC can predict the moisturizing effect of lipstick products.

Compositional Analyses of Electrodeposited II-VI Compound Semiconductor Thin Films

이명진,최홍진,전종호,명노승 건국대학교 자연과학연구소 1998 建國自然科學硏究誌 Vol.9 No.2

Cd+Se 혼합물의 열화학적 성질을 DSC를 이용하여 조사하였다. Cd과 Se분말을 이용하여 분석한 결과 Cd이 녹기 전 까진 CdSe의 형성이 관측되지 않았지만, Cd의 녹는 점 이상에서는 온도와 반응시간에 따라 상당한 양의 CdSe가 만들어지는 것을 알 수 있었다. 이상의 방법을 토대로 전기 화학적으로 합성한 CdSe박막의 조성을 분석하였다. 일정 전압에서 합성한 CdSe 박막을 DSC로 분석한 결과 Cd,Se 그리고 CdSe의 양을 각각 분석할 수 있었다. The thermochemistry of the condensed-phase Cd+Se=CdSe system was studied by differential scanning calorimetry(DSC). Formation of CdSe was not initiated until fusion of Cd reactant. However, increase of temperature or reaction time resulted in the formation of CdSe although there was no clear exothemic peak. Based on the thermochemistry of Cd+Se system, compositional analysis of electrodeposited CdSe thin films by the DSC was described. Potentiostatic deposition of CdSe thin films contained free Cd, free Se and CdSe depending on the deposition potential. Interesting features of Se thermochemistry were also described.

Freezing Behaviors of Frozen Foods Determined by H NMR and DSC

Suyong Lee,Sehun Moon,Jae-Yong Shim,Yong-Ro Kim 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.1

The freezing patterns of commercial frozen foods were characterized by using proton nuclear magnetic resonance (1H NMR) relaxometry and differential scanning calorimetry (DSC). The liquid-like components like unfrozen water were investigated as a function of temperature (10 to -40℃) and then compared with the unfrozen water content measured by DSC. The formation of ice crystals and the reduction of water in the foods during freezing were readily observed as a loss of the NMR signal intensity. The proton NMR relaxation measurement showed that the decreasing pattern of the liquid-like components varied depending on the samples even though they exhibited the same onset temperature of ice formation at around 0℃ When compared with the unfrozen water content obtained by the DSC, the NMR and DSC results could be closely correlated at the temperature above -20℃. However, the distinct divergence in the values between 2 methods was observed with further decreasing temperatures probably due to the solid glass formation which was not detected by DSC.

지방대체 케익의 저장중 이화학적 특성변화

김혜영 용인대학교 자연과학연구소 2001 自然科學硏究所論文誌 Vol.6 No.1

In this study, shortening of conventional yellow layer cake was replaced at different compositions of maltodextrin, amylodextrin, and octenyl succinylated amylodextrin. Quality changes of cake during 8 days of storage were evaluated by Rheometer and Differential scanning calorimetry(DSC). According to instrumental texture profile analysis(TPA), cakes with MD addition either alone or mixed with AD or OSAD showed a dramatic change on the cohesiveniss and gumminess during the storage period representing a larger scale of retrogradation. With a DSC measurement of the fresh cake and the stored cake, the control cake had a higher onset temperature(To), peak temperature(Tp), and conclusion temperature(Tc). In between the cakes, there were no significant differences in To, Tp, and Tc. The ΔH of the cakes with two month storage had higher values than that of the cakes with one month storage.

Ti-50.1at.%Ni합금의 변태거동에 미치는 시효처리의 영향(Ⅰ)

우흥식,박성범,강봉수,김성진 한국안전학회 2004 한국안전학회지 Vol.19 No.4

This study investigated the effects of aging on the transformation behavior of Ti-50.lat.% Ni alloy by means of differential scanning calorimetry. It was found that aging in the temperature range of 350℃~550℃ induced complex transformation behavior, involving the R-phase and multiple-stage martensitic transformation. Usually aged Ni-rich NiTi alloys undergo martensitic transformation on cooling from high temperatures in two step : B2 to R and then R to B19' (normal behavior). But under certain ageing conditions, the transformation can also occur in three or more step(unusual multiple step behavior). In the present study we use differential scanning calorimetry(DSC) for a systematic investigation of the evolution of transformation behavior with ageing temperature and time.

시차주사열량계를 이용한 진공백 성형 프리프레그의 경화 거동 연구

현동근,이병언,신도훈,김지훈 한국복합재료학회 2020 Composites research Vol.33 No.2

The cure kinetics of carbon fiber-reinforced prepreg for Vacuum Bag Only(VBO) process was studied by differential scanning calorimetry (DSC). The total heat of reaction (ΔHtotal = 537.1 J/g) was defined by the dynamic scanning test using prepregs and isothermal scanning tests were performed at 130oC~180oC. The test results of isothermal scanning were observed that the heat of reaction was increased as the temperature elevated. The Kratz model was applied to analyze the cure kinetics of resin based on the test results. To verify the simulation model, the degree of cure from panels using different cure cycles were compared with the measurement. The simulation model showed that the error against the experimental value was less than 3.4%. 본 연구에서는 시차주사 열량계(differential scanning calorimetry, DSC)를 이용하여 진공백 성형 공정에 사용되는 탄소 섬유 프리프레그의 경화 거동을 연구하였다. 프리프레그를 이용한 동적주사 시험을 통해 전체 발열량(ΔHtotal = 537.1 J/g)을 측정하였고, 130oC~180oC에서 등온주사 시험을 실시하였다. 등온주사 시험의 결과는 온도가 올라감에 따라 발열 반응이 증가되는 것을 확인하였다. 시험 결과를 토대로 수지의 경화 거동을 분석하기 위하여 Kratz 모델을 적용하였다. 서로 다른 경화 사이클로 제작된 평판의 경화도를 경화 예측 모델과 실험값을 비교하였다. 경화 예측 모델은 실험값 대비 3.4% 이하의 오차율을 보여 결과가 잘 부합하는 것을 확인하였다.

Wide-line NMR and DSC studies on intrinsically disordered p53 transactivation domain and its helically pre-structured segment

( Peter Tompa ),( Kyou-hoon Han ),( Monika Bokor ),( Pawel Kamasa ),( Agnes Tantos ),( Beata Fritz ),( Do-hyoung Kim ),( Chewook Lee ),( Tamas Verebelyi ),( Kalman Tompa ) 생화학분자생물학회 2016 BMB Reports Vol.49 No.9

Wide-line ¹H NMR intensity and differential scanning calorimetry measurements were carried out on the intrinsically disordered 73-residue full transactivation domain (TAD) of the p53 tumor suppressor protein and two peptides: one a wild type p53 TAD peptide with a helix pre-structuring property, and a mutant peptide with a disabled helix-forming propensity. Measurements were carried out in order to characterize their water and ion binding characteristics. By quantifying the number of hydrate water molecules, we provide a microscopic description for the interactions of water with a wild-type p53 TAD and two p53 TAD peptides. The results provide direct evidence that intrinsically disordered proteins (IDPs) and a less structured peptide not only have a higher hydration capacity than globular proteins, but are also able to bind a larger amount of charged solute ions. [BMB Reports 2016; 49(9): 497-501]

Basal buffer systems for a newly glycosylated recombinant human interferon-β with biophysical stability and DoE approaches

Kim, N.A.,Song, K.,Lim, D.G.,Hada, S.,Shin, Y.K.,Shin, S.,Jeong, S.H. Elsevier 2015 European journal of pharmaceutical sciences Vol.78 No.-

<P>The purpose of this study was to develop a basal buffer system for a biobetter version of recombinant human interferon-beta la (rhIFN-beta la), termed R27T, to optimize its biophysical stability. The protein was pre-screened in solution as a function of pH (2-11) using differential scanning calorimetry (DSC) and dynamic light scattering (DLS). According to the result, its experimental pI and optimal pH range were 5.8 and 3.6-4.4, respectively. Design of experiment (DoE) approach was developed as a practical tool to aid formulation studies as a function of pH (2.9-5.7), buffer (phosphate, acetate, citrate, and histidine), and buffer concentration (20 mM and 50 mM). This method employed a weight-based procedure to interpret complex data sets and to investigate critical key factors representing protein stability. The factors used were T-m, enthalpy, and relative helix contents which were obtained by DSC and Fourier Transform Infrared spectroscopy (FT-IR). Although the weights changed by three responses, objective functions from a set of experimental designs based on four buffers were highest in 20 mM acetate buffer at pH 3.6 among all 19 scenarios tested. Size exclusion chromatography (SEC) was adopted to investigate accelerated storage stability in order to optimize the pH value with susceptible stability since the low pH was not patient-compliant. Interestingly, relative helix contents and storage stability (monomer remaining) increased with pH and was the highest at pH 4.0. On the other hand, relative helix contents and thermodynamic stability decreased at pH 4.2 and 4.4, suggesting protein aggregation issues. Therefore, the optimized basal buffer system for the novel biobetter was proposed to be 20 mM acetate buffer at pH 3.8 +/- 0.2. (C) 2015 Elsevier B.V. All rights reserved.</P>

세라믹 재료의 고온 시차주사 열량 측정 및 분석

김동현(D. H. Kim),이춘만(C. M. Lee) 한국기계가공학회 2014 한국기계가공학회 춘추계학술대회 논문집 Vol.2014 No.11

이중사출 성형을 위한 저온 경화 액상실리콘고무 (LSR)의 경화 거동 분석

유형민 한국금형공학회 2023 한국금형공학회지 Vol.17 No.1

In multi-material injection molding, since two or more materials with different process conditions are used, it is essential to maximize process efficiency by operating the cooling or heating system to a minimum. In this study, Liquid silicone rubber (LSR) that can be cured at a low temperature suitable for the multi-material injection molding was selected and the cure behavior according to the process conditions was analyzed through differential scanning calorimetry (DSC). Dynamic measurement results of DSC with different heating rate were obtained, and through this, the total heat of reaction when the LSR was completely cured was calculated. Isothermal measurement results of DSC were derived for 60 minutes at each temperature from 80 ° C to 110 ° C at 10 ° C intervals, and the final degree of cure at each temperature was calculated based on the total heat of reaction identified from the Dynamic DSC measurement results. As the result, it was found that when the temperature is lowered, the curing start time and the time required for the curing reaction increase, but at a temperature of 90 ° C or higher, LSR can secure a degree of cure of 80% or more. However, at 80 ° C., it was found that not only had a relatively low degree of curing of about 60%, but also significantly increased the curing start time. In addition, in the case of 110 ° C, the parameters were derived from experimental result using the Kamal kinetic model.