• 패션비즈니스
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• 제12권3호
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• pp.54-61
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• 2008

The glitter of lame fabrics containing the metallic yarns may further be altered by $Na_2CO_3$ aqueous solution at an elevated temperature. In this study, the effect of the corrosion treatment on the yarn luster was evaluated using image analysis. The alkaline solution treatment was found to be more effective on the aluminum-based specimens than on the silver-based specimens. It was found that corrosion percentage measurement based on the transmission analysis may provide reasonable quantitative index, even if the measurement relies on an indirect method. Based on the quantitative results, the alkaline treatment condition for the specific specimen would be optimized for a desired glitter modification.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 1999년도 추계학술발표회 초록집
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• pp.8-9
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• 1999

• 한국표면공학회지
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• 제43권2호
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• pp.105-110
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• 2010

Electroless nickel plating on porous carbon substrate for the application of MCFC electrodes was investigated. Acidic and alkaline bath were used for the electroless nickel plating. The pore sizes of carbon substrates were 16-20 ${\mu}m$ and over 20 ${\mu}m$. The carbon surface was changed from hydrophobic to hydrophilic after immersing the substrate in an ammonia solution for 40 min at $60^{\circ}C$. The contact angle of water was decreased from $85^{\circ}C$ to less than $20^{\circ}$ after ammonia pretreatment. The deposition rate in the alkaline bath was higher than that in the acidic bath. The deposition rate was increased with increasing pH in both acidic and alkaline bath. The content of phosphorous in nickel deposit was decreased with increasing pH in both acidic and alkaline bath. The contents of phosphorous is low in alkaline bath. The minimum concentration of $PdCl_2$ for the electroless nickel plating was 10 ppm in alkaline bath and 5 ppm in acidic bath. The thickness of nickel was not affected by the concentration of $PdCl_2$.

• 한국염색가공학회지
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• 제14권6호
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• pp.305-312
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• 2002

In order to give a silk-like touch to PET fabrics, the PET fabrics were treated with NaOH alkaline solution in various conditions. In alkaline treatment, the liquor flow type pilot weight reduction apparatus with magnetostrictive ultrasonic transducer was used for the study. The effects of ultrasonic application, treatment time and temperature at NaOH 4% and 6"A solution on the decomposition rate of PET fabrics. From the results of the decomposition rate of PET fabrics, the qualitative and quantitative analysis of oligomer after decomposition of PET fabrics carried out by the HPLC. On the other hand, the surface pore characteristics of decomposition PET fabrics measured by porosimetery. The pore characteristics on the surface of treated PET fiber depended on the decomposition rate and did not depend on the ultrasonic cavitation. The pore diameter of alkaline untreated PET fiber were 15A and those of treated PET fibers were 5~6$\AA$ at the maximum pore volume. The average pore sizes of fiber before and after treatment were 141 h and 160h, respectively. Total amount of oligomer of the untreated PET fibers were 1.70wt% and 67.7% of total oligomer occupied with PET cyclic trimer and PET cyclic tetramer. Total amount of oligomer of fiber with 26.9% and 48.0% of weight loss without ultrasonic application were 1.78wt% and 1.79wt%, respectively. Also total amount oligomer of fibers which were reduced 27.7% and 48.2% of weight loss with ultrasonic application were 1.74wt%. This result showed that the removal rate of oligomer in the process of alkaline hydrolysis with ultrasonic higher than that of without ultrasonic application.tion.

• 한국수산과학회지
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• 제21권2호
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• pp.85-96
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• 1988

Purification and some properties of alkaline proteinases in the pyloric caeca of skipjack, Katsuwonus vagans, were investigated. Four alkaline proteinases, temporarily designated proteinases I, II, III and IV, were identified from the tissue extract of the pyloric caeca by ammonium sulfate fractionation, DEAE-Sephadex A-50 chromatography, and Sephadex G-100 and G-200 gel filtration. Result of disc-polyacrylamide gel electrophoretic analysis showed that the purified proteinases II and III were homogenous with the yields of $1.5\%\;and\;1.2\%$, and those specific activities were increased to 33 to 37 fold over that of the crude enzyme solution, respectively. Molecular weight of the proteinases II and III determined by sephadex G-100 gel filtration were 28,500 and 24,200, respectively. The optimum conditions for the caseinolytic activity of the two enzymes were pH 9.6 and $48^{\circ}C$. The reaction rates of the two alkaline proteinases were constant to the reaction time to 80 min in the reaction mixture of $3.4{\mu}g/ml$ of enzyme concentration and $2\%$ casein solution. The Km values against casein substrate determined by the method of Lineweaver-Burk were $0.56\%$ for proteinase II and $0.30\%$ for proteinase II. The proteinases II and III were inactivated under the presence of $Ag^+,\;Hg^{2+},\;Ni{2+},\;Fe^{2+},\;and\;Cu^{2+}$, and but activated by $Mn^{2+}\;and\;Ca^{2+}$ and markedly inhibited by the soybean trypsin inhibitor and N-p-toluenesulfonyl-L-lysine chloromethyl ketone. Therefore, the proteinases II and III were found to be a group of serine proteases and assured to be trypsin-like proteinases.

• 한국전기전자재료학회논문지
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• 제26권7호
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• pp.522-527
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• 2013

In this paper, We studied the change of surface and variation of elements on both electrodes of hydrogen generator of alkaline electrolysis in use of FE-SEM and SIMS. We used the stainless steel 316(600 ${\mu}m$) as electrode in condition of 25%KOH, $60^{\circ}C$ Temperature. The results show that the intensity of elements (C, Si, P, S, Ti, Cr, Mn, Fe, Ni, Mo) of Positive Electrode are decreased as much as about $10^1{\sim}10^3 $than the original electrode. Thickness of Positive Electrode is decreased about 40 ${\mu}m$ after chemical reaction. The negative electrode, however, shows a slight variation in the intensity of elements (C, Si, P, Fe, Ni, Mn, Mo) but Change of thickness and surface' shape of electrode show nothing after chemical reaction. The change in thickness and variation of Stainless Steel 316 cause the lifetime of electrode to be shorted. We also observed hydrogen, oxygen, potassium in both electrodes. Especially, The potassium is increased in proportional with depth of positive electrode. this means the concentration of alkali solutions is changed. and so we have to supply alkaline solution to generator in order to produce same quantity of hydrogen gas continuously. we hope that this study gives a foundation to develop the electrode for hydrogen generator of alkaline electrolysis.

• 폴리머
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• 제29권1호
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• pp.54-58
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• 2005

미생물 합성 poly[(R)3-hydroxybutyrate]](P(3HB))의 알칼리 및 효소 분해거동을 단결정과 Langmuir 단분자막을 모델시스템으로 하여 연구하였다. 단결정의 초기효소 및 알칼리 분해거동은 단결정의 장축에 대해 수직방향(b축)으로 분해가 일어났고 용융점 이하의 온도에서 열처리 또한 단결정의 b축을 따라 봉우리 형태의 형태학적 변화를 관찰하였다. 이러한 결과는 라멜라 단결정은 b축을 따라 불규칙한 영역을 가지고 있음을 의미하고 효소분해가 불규칙한 영역에서 선호적으로 일어난다고 설명할 수 있다. 한편, P(3HB), 단분자막의 효소 및 알칼리 분해경향은 분해매체와 표면압력에 크게 의존하였다. 알칼리 분해의 경우 낮은 표면압력에서도 분해를 나타내는 반면 효소 분해는 높은 표면 압력 하에서 분해거동을 나타내었다. 이러한 현상은 분자수준의 크기인 알칼리 분해매체는 P(3HB) 단분자막과 좁은 접촉면적(낮은 표면압력)에서도 활성을 보이는 반면 크기가 큰 분해효소는 보다 큰 활성 접촉면적(높은 표면압력)을 필요로 하는 것으로 판단된다.

• 전기화학회지
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• 제18권2호
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• pp.45-50
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• 2015

본 연구에서는 리튬 이온 전도성 세라믹 고체전해질($Li_{1+x+y}Al_xTi_{2-x}Si_yP_{3-y}O_{12}$, LATP)의 알칼라인 용액 내에서의 화학적 안정성을 증가시키기 위하여, 고체전해질 표면을 질화 공정 처리를 통해 개질하였다. LATP 고체전해질의 화학적 안정성 및 전기화학 특성과 관련된 고체전해질 표면 형상 및 구조 특성 등을 X-선 회절법, X-선 광전자 분광법, 주사 전자 현미경 및 임피던스 측정을 통하여 분석하였다. 질화 처리된 LATP 시료를 30일간 알칼라인 용액에 담지하여, 표면 처리하지 않은 시료와 비교시 향상된 화학적 안정성을 나타냈으며, 이를 하이브리드 리튬-공기 전지에 적용하여 비교시 개선된 충방전 분극 및 효율 특성을 보였다. 이러한 결과를 바탕으로 질화 처리 공정을 통한 표면 개질은 알칼라인 용액내에서의 세라믹 고체전해질의 화학적 안정성을 증가시키는데 효과적으로 도움이 될 것으로 판단된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.362-363
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• 2006

Ozonized DI water was supplied to make alkaline cleaning solutions to replace SCI chemicals in a bath with and without recirculation. With recirculation, low dissolved ozone and low pH cause lower particle removal efficiency (PRE) of 75%. However, direct supply of ozonized water with $NH_4OH$ to a bath without recirculation resulted in higher PRE over 93 %.

• 한국염색가공학회지
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• 제25권3호
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• pp.215-222
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• 2013

The purpose of this study is to minimize fading fabrics of surgical gown by repeated severe laundering and sterilization condition. The study showed that the best conditions were reduction cleaning using sulphinic acid derivatives or glucose organic chemicals at $98^{\circ}C$ alkaline solutions. In these conditions, color difference values(dE) were below 1.0 that means unrecognizable color change by repeated laundering and sterilization. If it treated with only laundering, reduction cleaning conditions may adjust over $80^{\circ}C$ alkaline solution. In conclusion, it is needed to select the high-washing fastness dye and reduction cleaning using sulphinic acid derivatives or glucose organic chemicals at $98^{\circ}C$ alkaline solutions for removal unfixed dyes.