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송우용(Woo-Yong Song),전소영(Soyoung Juhn),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.5
Cellulose nanofibrils produced after quaternary amine pretreatment were investigated as basic characteristics of CNF with nanoparticle size, viscosity, and rheological properties. With DS 0.1 (C-CNF1), width of cellulose nanofibril was 8.1-14.1 nm compared with width of 3.9-9.5 nm with DS 0.3 (C-CNF2), which had narrower width distribution than carboxymethyl pretreated cellulose nanofibril (DS 0.3, width range: 3.1-20.6 nm). There was no significant difference in length of CNF regardless of pretreatment method or different degree of substitution. In viscosity, carboxymethylated CNF had higher than quaternary amine treated CNF due to different affinity to aqueous medium with different functional group. Quaternary aminated CNF had gel-like structure but there was no expulsion of water (syneresis), which syneresis is the characteristics of carboxymethylated CNF.
나노 입도 분석기를 사용한 셀룰로오스 나노섬유의 폭과 크기 측정
송우용(Woo-Yong Song),전소영(Soyoung Juhn),곽지혜(Ju Hye Gwak),신수정(Soo-Jeong Shin),성현아(Hyun-A Seong) 한국펄프·종이공학회 2019 펄프.종이技術 Vol.51 No.1
Applications of cellulose nanofibril are highly dependent on its dimension (length and width). Quick and easy methods for measuring cellulose nanofibril dimensions are critical in process quality control. A nanoparticle size analyzer (Dynamic laser scattering) was applied for cellulose nanofibril characterization and two distinct peak areas were observed as one was its width (2-50 nm) and another was its length (100-500 nm). The width and length of the nanofibril from the nanoparticle analyzer were lower than those of TEM image analysis but each samples showed a similar trend between nanoparticle analyzer and TEM image analysis. Thus, the dynamic laser scattering nanoparticle analysis is recommended as a quality control tool for cellulose nanofibril making process for estimation of its length and width.
셀룰로오스 분해 능력을 갖는 세균의 셀룰로오스 나노 섬유 현탁액 오염 방지를 위한 첨가제 탐색
송우용(Woo-Yong Song),박태현(Tae Hyeon Park),전소영(Soyoung Juhn),성현아(Hyun-A Seong),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.4
To prevent cellulase-containing bacterial contamination in cellulose nanofibril suspension, addition of preservatives in suspension was investigated. Without preservatives, viscosity was drastically decreased 74.8% by S. xylosus and 78.1% by B. subtilis. With more than 1.2% of phenoxyethanol addition, there was no bacterial contamination with small viscosity decrease. With 1.2% of 1,2-hexanediol addition, there was bacterial contamination observed by microscopic obervation and viscosity decrease. With 1.6% of 1,2-hexanediol addition, there was small bacterial contamination but no viscosity decrease. In case of sodium azide addition, this was less effective as preservatives than phenoxyethanol or 1,2-hexanediol.
옥수수대 및 대나무 섬유로부터 제조된 셀룰로오스 나노피브릴의 특성
송우용(Woo-Yong Song),신수정(Soo-Jeong Shin),전소영(Soyoung Juhn) 한국펄프·종이공학회 2017 펄프.종이기술 Vol.49 No.2
Corn stalk and bamboo were used for raw materials for cellulose nanofibril by pulping followed by bleaching to compared with hardwood raw material. Corn pulp was produced by soda pulping process but bamboo pulp was made by soda-anthraquinone pulping process. Pulp yield was lower in bamboo (32.7%) compared with corn stalk (37.2%). Lower yield of bamboo pulp resulted in higher lignin content than hardwood, and more xylan removal in alkaline pulping. Lower yield of corn stalk come from higher hot-water extractives content than hardwood. Cellulose nanofibril (CNF) was made by bleached pulp with carboxymethylation pretreatment. Average width of CNF was 4.8 ㎚ for CNF from yellow poplar pulp, and 6.1 ㎚ from that of bamboo, but 16.5 nm for corn stalk pulp. Water-holding ability quite similar between bamboo CNF and yellow poplar CNF but quite lower for corn stalk CNF.