• Proceedings of the Membrane Society of Korea Conference
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• 1997.10a
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• pp.85-86
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• 1997

1. 서론 : Nanofiltration(NF)은 분자량이 200-1000인 유기물과 음이온 및 다가 이온등을 일가 이온으로부터 선택적으로 분리함으로써 유기물의 농축과 이온의 선택적인 분리를 동시에 행할 수 있는 분리 공정이며, 순수의 제조, 과일과 야채주스의 농축, 저알콜 맥주와 와인의 제조, 낙농 산업에서 유제품의 농축, 섬유공업에서 염료와 이온의 분리 및 제지공업의 폐수 처리 등에 응용되고 있다. NF용 막재료로는 셀룰로오스 계열의 고분자나 폴리아미드, 폴리술폰, PAN등이 연구되어 왔으며 최근에는 친수성이 좋고 가교를 하지 않고도 이온 결합에 의하여 강도를 유지할 수 있다는 아이오노머의 성질을 이용하여 아이오너마를 Nanofiltration용 막재료로 이용하려는 연구가 이루어지고 있다.[1-3] 그러나 아이오노머의 미세구조와 유기물의 분리특성간의 관계에 관한 연구는 미흡한 실정이다. 따라서 본 연구에서는 분리막의 성형성을 향상시키고자 알킬메타크릴레이트가 도입된 아이오너머를 합성하고 알킬기의 길이나 이온의 함량 등 고분자의 구조에 따른 아이오노머막의 분리특성을 연구하여 아이오노머막의 NF용막으로서의 응용가능성을 살펴보았다.

• Textile Coloration and Finishing
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• v.21 no.2
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• pp.29-39
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• 2009

The color mixture, obtained from Indigo and Japanese pagoda tree, was applied to cellulose fibers such as cotton, linen and rayon to diversify color gamut of natural dyes. The color mixture was tried with two different methods. The first process was that cellulose fibers were dyed with $5{\sim}25%$ owf Japanese pagoda tree solution, and then dyed 1 to 4 times with Indigo. The second process was dyeing 1 to 7 times with Indigo, followed by dyeing with $5{\sim}25%$ owf Japanese pagoda tree solution. K/S value of the dyed fibers with one colorant and color mixture increased in the order of linen, cotton, rayon. It was also found that the first process could give higher K/S values than the second process.

• Bulletin of Food Technology
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• v.15 no.2
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• pp.45-58
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• 2002

본 연구에서는 국내산 몰로키아 잎에서 추출한 mucilage의 이화학적 특성, 동물실험을 통한 콜레스테롤 대사에 미치는 영향가 임상실험에서의 비만 및 체지방대사에 미치는 영향을 검토하였다. 몰로키아 잎은 식이섬유의 함량이 37.4%, 단백질의 함량은 24.4%를 차지하고 있으며, 칼슘의 함량이 2,000mg% 이상으로 대단히 높았다. 몰로키아 앞에서 추출된 mucilage의 경우 단백질의 총당에 대한 비율이 $50^{\circ}C$에서 57.6%를 차지하였으며, 구성다당류의 분자량은 약 500,000 dalton의 크기를 나타내었고 40,000 dalton 이하의 것도 일부 존재하는 것으로 나타났다. 동물실험에서는 혈장의 총 콜레스테롤 함량은 대조구인 셀룰로오스 첨가군과 유의적인 차이가 나타나지 않았지만, 간에서의 지방 농도는 몰로키아 분말과 mucilage 첨가군이 유의적으로 감소되었고 변으로의 콜레스테롤 배설량도 몰로키아 분말 첨가군과 mucilage 첨가군 순으로 높았다. 몰로키아의 섭취가 다이어트와 변비개선에 미치는 효과를 검토한 결과, 체중의 감소는 아주 낮은 유의성을 보였고, 혈액 내 생화학적 수치에서 초기치와 8주 후의 값에는 유의한 차이를 보이지 않았지만, 체지방율의 경우에는 현저히 줄어들었다. 또한 몰로키아의 섭취로 배변이 2배 이상 증가하였으며, 배변시의 통증도 상당히 완화시키는 것으로 나타났다.

• Textile Coloration and Finishing
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• v.11 no.1
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• pp.48-60
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• 1999

In this paper, a new regenerated celluosic fiber, "Tencel" was treated with cellulase enzyme. Also Tencel fabrics were pretreated with NaOH and dyed with various reactive dyes, and subsequently finished with DMDHEU. $\Delta{E}^*_{ab}$ value was calculated by measuring color difference before and after wet abrasion test to rubbing. The fibrillation propensity was estimated on Tencel by means of weight loss, $\Delta{E}^*_{ab}$ value, and SEM observation. Weight loss of NaOH pretreated Tencel fabric is more lower than that of original fabric. The cellulase treatment decreased tensile strength but improved wet abrasion strength, wrinkle recovery, and bending properties. Tendency of fibrillation for Tencel fabric was reduced by NaOH-pretreatment, dyeing with multifunctional reactive dyes, and afterfinishing by DMDHEU.by DMDHEU.

• Textile Coloration and Finishing
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• v.15 no.5
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• pp.294-300
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• 2003

The anionic agent containing dichloro-s-triazinyl reactive group was synthesized and applied to the cotton fabrics to introduce covalent bonds. This attempt was expected to improve the affinities of cationic compounds, such as cationic dyes, chitosan, quaternary ammonium antimicrobial agents and metal ions, by the electrostatic attractive force. As expected, the anionic agent was reacted with cotton fabrics at room temperature. In order to examine the adsorptivity of the cationic compounds on to the anionized cotton fabrics, firstly a cationic dye(C. I. Basic Violet 7) was applied. The color strength of the dyeing of anioized cotton fabric was highly increased comparing to that of untreated fabric.

• Journal of the Korean Home Economics Association
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• v.30 no.1
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• pp.1-9
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• 1992

Graft polymerization mechanism and rate of polymerization of MMA and MMA/4-VP onto cellulose fiber using Ce(IV) salt as an initiatior were investigated. It was shown that the concentration of Ce(IV) salt affected on the graft yield, graft efficiency, total conversion and the rate of graft polymerization. The graft yield and total cenversion for MMA grafted polymer were significantly higher than those for MMA/4-VP grafted polymer with variation of CAN concentration. In this system the oxidative termination by Ce(IV) salt was considered particularly in higher concentration Ce(IV) ion. The change in the mode of termination reactions with variation of CAN concentration made possible the presence of an optimum Ce(IV) ion concentration for maximum graft yield.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.11a
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• pp.557-560
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• 2004

This paper is to investigate the fire endurance of high performance concrete with the contents of cellulose fiber. According to test results, the use of CL lead to decrease in fluidity. For compressive strength, the use of CL had no influence on compressive strength. For spalling properties, plain concrete showed a severe spalling failure. The use of CL protected from spalling of concrete, but most specimens had scale failure and partial destruction of specimens. This is due to the insufficient fiber length and diameter of CL fiber, which was unable to discharging the internal vapour pressure. For this reason, CL fiber can not be used to protect from spalling oh high performance concrete. Residual strength was observed to $5\~7\%$ of original strength.

• TTA Journal
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• s.144
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• pp.18-19
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• 2012

최근 지식경제부 산하 산업기술연구회가 앞으로 10년간 한국을 먹여 살릴 최고 수준의 기술 14가지를 발표했다. 산업기술연구회 산하 7개 출연연구기관은 지난해부터 매년 '세계 1등 연구과제'를 지정받아 세계 최고 수준의 성과를 내놓고 있다. 이 가운데 세계 1위를 달리고 있는 기술은 한국생산기술연구원의 '에코 알루미늄 에코 마그네슘'과 '해조류 셀룰로오스 등을 이용한 연료 생산 기술', 한국전자통신연구원의 '100배 빠른 광인터넷 기술', 한국건설기술연구원의 '세상에서 가장 긴 콘크리트 교량 기술', 한국철도기술연구원의 '콘크리트 발열 촉진 양생 기술'을 비롯해 '저심도 도시철도 시스템 기술'과 초경량 유리섬유 복합소재 전동차 대차 프레임', 한국화학연구원의 '하이브리드 나노세공체 응용 연구' 등 8가지이다. 이 중 몇 가지 기술을 살펴보자.

• Journal of the Korean institute of surface engineering
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• v.57 no.1
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• pp.31-37
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• 2024

The surge in demand for lithium is primarily fueled by the expanding electric vehicle market, the necessity for renewable energy storage, and governmental initiatives aimed at achieving carbon neutrality. This study proposes a straightforward method for lithium extraction utilizing cellulose nanofiber (CNF) via a vacuum filtration process. This approach yields a porous CNF film, showcasing its potential utility as a lithium extractor and indicator. Given its abundance and eco-friendly characteristics, cellulose nanofiber (CNF) emerges as a material offering both economic and environmental advantages over traditional lithium extraction techniques. Hence, this research not only contributes to lithium recovery but also presents a sustainable solution to meet the growing demand for lithium in energy storage technologies.

• Journal of Korea Foresty Energy
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• v.20 no.1
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• pp.6-11
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• 2001

In order to use bast fibers of mulberry tree at a pulp source of Hanji, the bast fibers were microbiologically treated with several wood rot fungi, and the microscopic characteristics of bast fibers depending on treatment days were evaluated. By wood rot fungi, Phanerochaete chrysosporium and Trametes versicolor, the weight reduction ratio was approximately 50 percent within incubation for 20 days. occurring together with decomposition of useful fibers. However, Hwterobasidion insularis and Stereum hirsutum have completely decomposed the utmost layer of black blue colored bast fibers, and not caused the damage if fibers. Until incubation for 10 days, the cellulose content of vast fibers by Stereum hirsutum was 78.9 percent with lignin content of 7.2 percent, showing an appropriate decomposition for useful fibers. By microscopic observation, the bundled fibers were separated to single fiber within treatement days 30 by Pleurotus ostreatus, and there were no damage on the surface of fiber by treatment days 50.