• 한국염색가공학회지
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• 제21권1호
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• pp.38-45
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• 2009

First of all, the properties imparted to PET fabrics are resistance to and recovery from creasing or wrinkling when wet or dry; high resistance to stretch in the filament yarns but not in the staple; high abrasion resistance; good texture and appearance; resistance to heat ageing; good chemical resistance and good resistance, behind glass, to sunlight. But, the low moisture regain of PET fabric conduces to static troubles in textile processing. Furthermore, garments made from PET may, during wear, develop electric charges which attract to the fabric particles of soil(dirt, swarf, dust) flying in the air, so that the cuffs of shirts, for example, become soiled quickly and are not easily laundered clean. The sericin constitutes 25$\sim$30％ of silk protein and surrounds the fibroin fiber with sticky layer that supports the formation of a cocoon. The useful biochemical properties of sericin protein are oxidation resistant, antibacterial, UV resistant, hydrophilic property, and good affinity with hydrophobic material. These properties can be used as an improving reagent or a coating agent for natural and synthetic fibers, fabrics, and other intermediate products. The sericin is also applied to cross-link, and can be blended with other materials. In this study, we modified the surface of PET fabric by mixture of sericin finishing agent; sericin, polyuretane binder and 1,2,3,4-butanetetracarboxylic acid (BTCA) cross-link agent. Also, we investigated the finshing effect; moisture regain, stiffness, handle, drape and electrostatic. The moisture regain of PET fabric treated with sericin finishing agent was higher than that of untreated PET fabric. As a result of evaluating influence about handle of PET fabrics treated with sericin finishing agent, it was confirmed that the sericin finishing agent could be use as a linen like finishing agent.

• 공업화학
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• 제24권1호
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• pp.49-54
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• 2013

혼합용액에서 nitrate 이온을 선택적으로 제거하기 위해 복합탄소전극을 제조하였다. 질산이온 선택성 수지(BHP55, Bonlite Co.) 분말을 탄소전극 표면에 코팅하여 전극을 제조하였다. 제조한 전극으로 BHP55 셀을 제작하여 chloride, nitrate, sulfate 이온이 혼합된 용액에 대해 축전식 탈염 실험을 수행하였다. 그리고 BHP55 셀에서의 질산 이온 제거량을 이온교환막을 결합한 MCDI 셀의 결과와 비교하였다. BHP55 셀에서 이온의 총 흡착량은 MCDI 셀에서 보다 31% 증가한 $38.3meq/m^2$를 나타냈다. 또한 BHP55 셀에서 질산 이온의 흡착량은 $15.9meq/m^2$ (전체 흡착량의 42%)이었고, 이는 MCDI 셀에서 보다 2.1배 큰 것으로 나타났다. 실험결과 제조한 복합탄소전극은 음이온 혼합용액에서 질산 이온을 선택적으로 제거하는데 매우 효과적임을 알 수 있었다.

• 박물관보존과학
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• 제7권
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• pp.43-51
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• 2006

광주 신창동 저습지유적에서 다양한 목재유물과 더불어 목재표면에 옻칠이 된 칠기들이 다량으로 출토되었다. 칠기들은 목질부가 열화 되어 취약하며 칠층이 들떠있어 박락과 갈라짐의 발생우려가 높다. 따라서 진공 동결건조에 효과적인 PEG#4000 40%로 함침처리 하였고 동결건조의 종료온도를 0℃이하로 하였다. 동결건조 직후 목제와 칠기의 중량과 상대습도 60% 의 밀폐공간에서 방치 후 중량을 비교하였다. 그 결과 중량변화가 없었으므로 동결건조 중 종료 온도 조절로써 건조 후 목재함유수분조절과 대기 중 습도변화에 안정성을 확인하였다. 칠도막 분석결과 밑층에 흑색안료를 혼합하여 목재표면에 밑칠을 하고 칠층의 상부에 옻칠과 흑색안료를 혼합하여 3~4회 칠한 것과 검은 밑칠을 하지 않고 칠층에 옻칠과 흑색 안료를 혼합하여 3~4회 칠한 것으로 확인되었다.

• 한국지반공학회논문집
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• 제21권5호
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• pp.215-223
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• 2005

압전 소자는 전기적 에너지를 기계적 에너지로, 기계적 에너지를 전기적 에너지로 변환하는 물질이다. 피에조 세라믹판을 이용하여 탄성 매질을 겹쳐서 만든 벤더 엘리멘트는 전압을 가하면 변위가 발생하는 특성을 이용하여 액츄에이터로 사용할 수 있고, 반대로 변위가 생기면 전압이 발생하는 압전 현상을 이용하여 변위를 계측하는 트랜스듀서로 활용하여 탄성파 시험의 발진자와 수진기로 실내 시험에서 사용되고 있다. 벤더 엘리멘트를 이용한 탄성파 시험으로 토목재료로 많이 쓰이는 콘크리트의 강성을 측정하였고, 자유단 공진주 시험을 통하여 그 결과를 평가 하였다. 카올리나이트를 이용하여 연약지반을 모사하여 카올리나이트 슬러리의 압밀에 따른 강성 변화를 탄성파 시험을 이용하여 측정할 수 있다. 벤더 엘리멘트는 연약지반에서 전단파 계측에 탁월한 성능을 가지고 있으며, 장래에 연약지반 현장 계측에 사용될 가능성이 큰 것으로 입증되었다.

• Journal of Microbiology and Biotechnology
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• 제22권7호
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• pp.1015-1020
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• 2012

Antifungal cement mortar or microbiological calcium carbonate precipitation on cement surface has been investigated as functional concrete research. However, these research concepts have never been fused with each other. In this study, we introduced the antifungal calcite-forming bacteria (CFB) Bacillus aryabhattai KNUC205, isolated from an urban tunnel (Daegu, South Korea). The major fungal deteriogens in urban tunnel, Cladosporium sphaerospermum KNUC253, was used as a sensitive fungal strain. B. aryabhattai KNUC205 showed $CaCO_3$ precipitation on B4 medium. Cracked cement mortar pastes were made and neutralized by modified methods. Subsequently, the mixture of B. aryabhattai KNUC205, conidiospore of C. sphaerospermum KNUC253, and B4 agar was applied to cement cracks and incubated at $18^{\circ}C$ for 16 days. B. aryabhattai KNUC205 showed fungal growth inhibition against C. sphaerospermum. Furthermore, B. aryabhattai KNUC205 showed crack remediation ability and water permeability reduction of cement mortar pastes. Taken together, these results suggest that the $CaCO_3$ precipitation and antifungal properties of B. aryabhattai KNUC205 could be used as an effective sealing or coating material that can also prevent deteriorative fungal growth. This study is the first application and evaluation research that incorporates calcite formation with antifungal capabilities of microorganisms for an environment-friendly and more effective protection of cement materials. In this research, the conception of microbial construction materials was expanded.

• 한국표면공학회지
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• 제38권3호
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• pp.106-111
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• 2005

Ternary Ti-B-C coatings were synthesized on WC-Co and Si wafers substrates by a PECVD technique using a gaseous mixture of $TiCl_4,\;BCl_3,\;CH_4,\;Ar,\;and\; H_2$. The effects of deposition variables such as substrate temperature, gas ratio, $R_x=[BCl_3/(CH_4+BCl_3)]$ on the microstructure and mechanical properties of Ti-B-C coatings were investigated. From our instrumental analyses, the synthesized Ti-B-C coatings was confirmed to be composites consisting of nanocrystallites TiC, quasi-amorphous TiB2, and amorphous carbon at low boron content, on the contrary, nanocrystallites $TiB_2$, quasi-amorphous TiC, and amorphous carbon at relatively high boron content. The microhardness of the Ti-B-C coatings increased from $\~23 GPa$ of TiC to $\~38 GPa$ of $Ti_{0.33}B_{0.55}C_{0.11}$ coatings with increasing the boron content. The $Ti_{0.33}B_{0.55}C_{0.11}$ coatings showed lower average friction coefficient of 0.45, in addition, it showed relatively better wear behavior compared to other binary coatings of $TiB_2$ and TiC. The microstruture and microhardness value of Ti-B-C coatings were largely depend on the deposition temperature.

• 펄프종이기술
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• 제29권3호
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• pp.7-16
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• 1997

The constituents of deposits on paper machine and holes/spots in paper have been studied by consequently a combination of analytical techniques, such as FTIR, Py-GC-MS, and. EDS. FTIR spectroscopy was used prior to Py-GC-MS and EDS analysis, as preliminary analysis technique. The analysis of organic components were carried out with the use of a pyrolysis unit connected to a GC-MS, and inorganic components in ash were analysed by SEM equipped with an EDS analyzer after pyrolysis at 59$0^{\circ}C$. The deposits on the dryer section were complex pitch, which was the mixture of the organic contents of fatty acid ester and starch, and the inorganic contents of talc, clay, and calcium carbonate. The complex pitch was estimated to come from the coated broke. We knew the deposits on the metering rod of sym-sizer were associated with the interaction of unstable AKD and CaCO$_3$. The compositions of holes or spots varied considerably and were associated with chemical interaction within the system. The holes, spots, and blotches in the finished paper were PE and PP that were streamed out from pulp sources, complex pitch that were caused by the interaction of the different additives in the system, polymer such as flexible PVC that used for the prop of palette, and hot melt as adhesives that came from the inadequate handling of broke. In addition, we identified that poly(caprolactam) which is used for forming fabrics or press felts, could be mixed with the raw materials by accident and results in streak on coating.

• 한국산학기술학회논문지
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• 제13권8호
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• pp.3800-3805
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• 2012

본 논문에서는 도심 열섬현상 방지 및 에너지 효율을 높이기 위하여 적외선 반사율이 30%이상인 건물 내 외장재용 흑색 차열안료 및 도료에 대한 연구를 하였다. 안료는 $Fe_2O_3$과 $Cr_2O_3$의 혼합원료를 $900{\sim}1,200^{\circ}C$에서 소성하여 합성하였으며, 도료는 합성한 안료에 아크릴수지와 기타첨가제를 사용하여 제조하였다. 연구결과, Cr과 Fe을 1:0.9 몰비로 혼합하여 $1,000^{\circ}C$에서 소성한 안료의 발색도가 가장 우수하였고, 차열안료 20%에 분산제 1.5%를 첨가하여 제조한 차열도료로 $125{\mu}m$ 두께의 도막을 형성시켰을 때 적외선 반사가 가장 우수하였다. 차열도료와 일반도료의 표면온도 차이는 $36.5^{\circ}C$로 나타났으며 700~2,500nm 파장대의 적외선 반사율(TSR)은 39.3%로 측정되었다. 또한, 500시간의 내후성 평가에서 색상변화는 거의 나타나지 않았다.

• 자원리싸이클링
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• 제29권1호
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• pp.70-80
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• 2020

본 연구에서는 유도로를 사용하여 알루미늄 캔 스크랩의 재활용 효율을 플럭스 종류와 혼합 비율의 영향에 대해 조사하였다. 알루미늄 캔 제조 공정에서 발생한 알루미늄 캔 스크랩의 표면 코팅층 약 500 ℃에서 30 분간 열처리를 통해 제거가 가능하였다. 용해 공정 온도는 알루미늄 합금 용해 온도보다 높은 온도로 설정하였고, 플럭스 종류와 혼합 비율에 따른 용탕처리를 진행하였다. 그 결과, 750 ℃에서 3 wt.%의 플럭스(Salt flux와 MgCl₂ 혼합비율 70:30)의 조건에서 알루미늄을 최적으로 회수 할 수 있었다. 회수된 Al합금은 인장강도 249 MPa과 연신율 14 %로써 Al5083 소재와 거의 동일한 기계적 특성을 나타냄을 알 수 있었다.

• 한국표면공학회지
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• 제54권5호
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• pp.230-237
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• 2021

In this study, the influence of silicon contents on the microstructure, mechanical and tribological properties of Ti-Al-Si-N coatings were systematically investigated for application of cutting tools. The composition of the Ti-Al-Si-N coatings were controlled by different combinations of TiAl₂ and Ti₄Si composite target powers using an arc ion plating technique in a reactive gas mixture of high purity Ar and N₂ during depositions. Ti-Al-Si-N films were nanocomposite consisting of nanosized (Ti,Al,Si)N crystallites embedded in an amorphous Si₃N₄/SiO₂ matrix. The instrumental analyses revealed that the synthesized Ti-Al-Si-N film with Si content of 5.63 at.% was a nanocomposites consisting of nano-sized crystallites (5-7 nm in dia.) and a three dimensional thin layer of amorphous Si₃N₄ phase. The hardness of the Ti-Al-Si-N coatings also exhibited the maximum hardness value of about 47 GPa at a silicon content of ~5.63 at.% due to the microstructural change to a nanocomposite as well as the solid-solution hardening. The coating has a low friction coefficient of 0.55 at room temperature against an Inconel alloy ball. These excellent mechanical and tribological properties of the Ti-Al-Si-N coatings could help to improve the performance of machining and cutting tool applications.