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Yoo, Yeongsuk,Choi, Jaeyeong,Zielke, Claudia,Nilsson, Lars,Lee, Seungho The Korean Society of Analytical Science 2017 분석과학 Vol.30 No.1
Starch is a mixture of amylose (AMY) and amylopectin (AMP) which are different in physical properties such as molar mass (M), rms radius ($R_g$) and hydrodynamic diameter ($d_H$). The rheological and functional properties of starch are influenced by various factors including the molecular size, molar mass distribution (MD) and the concentration ratio of AMY and AMP. It is also important to analyze proteinaceous material in starch as they affect the flavor and texture of food to which starch is added. In this study, asymmetrical flow field-flow fractionation (AF4) was employed for separation and quantitation of AMY and AMP in starches (Amaranth, potato, taros and quinoa). AF4 was coupled with a multi-angle light scattering (MALS) and a refractive index (RI) detector for determination of the absolute M, MD and molecular structure. It was found that AMP has the M and $R_g$ ranging $3.7{\times}10^7{\sim}6.5{\times}10^8g/mol$ and 84 ~ 250 nm, respectively. Also the existence of branch was confirmed in higher M. In addition, proteinaceous material in starch was analyzed by AF4 coupled with a fluorescence detector (FS) after fluorescence-labeling. AF4-FS with fluorescence-labelling showed a potential for investigation on existence of proteinaceous material and the interaction between proteinaceous material and polysaccharide in starch.
괴재 및 전로슬래그를 이용한 CO<sub>2</sub> 저감 및 칼슘 추출 후 슬래그 활용
유영석 ( Yeongsuk Yoo ),최홍범 ( Hongbeom Choi ),방준환 ( Jun-hwan Bang ),채수천 ( Soochun Chae ),김지환 ( Ji-whan Kim ),김진만 ( Jin-man Kim ),이승우 ( Seung-woo Lee ) 한국공업화학회 2017 공업화학 Vol.28 No.1
광물탄산화 기술은 천연광물 및 산업부산물에 포함된 칼슘이나 마그네슘을 이산화탄소와 반응시켜 탄산염을 생성하는 기술로 이산화탄소를 열역학적으로 안정한 형태로 저장할 수 있는 기술이다. 본 연구는 철강슬래그를 이용한 이산화탄소 저감 및 추출 후 슬래그 재활용을 통해 환경적 부담 및 공정 비용 절감을 절감할 수 있는 광물탄산화 상용화 기술 개발을 목표로 설정하였다. 추출 용매(염화암모늄)를 사용하여 괴재 및 전로슬래그로부터 칼슘을 추출하고 추출된 칼슘을 이산화탄소와 반응시켜 순도 98% 이상의 탄산칼슘을 합성하였다. 또한 칼슘 추출 후 슬래그를 건축자재(패널)로 활용하는 기술을 개발하였다. 슬래그의 칼슘 추출효율에 따라 상이한 결과를 보였지만 광물탄산화 전체 공정에 있어 중량 비(약 80-90%)를 차지하는 칼슘 추출 후 슬래그(잔여슬래그)의 활용을 통해 광물탄산화 공정으로부터 배출되는 산업부산물의 양을 최소화하고자 하였다. 잔여슬래그는 시멘트 패널 제작에 활용되는 규사미분 대체 물질로서 이용하였고 기존 시멘트 패널과 물성평가(압축강도 및 휨강도)를 상호 비교하였다. 용액 내 칼슘 농도는 유도결합 플라즈마 분광분석기(Inductively coupled plasma optical emission spectrometer, ICP-OES)를 사용하여 분석하였다. 합성한 탄산칼슘은 X선 회절 분석법(X-ray diffraction, XRD)을 이용하여 결정학적 특성 및 정량 분석하였고 주사 전자 현미경(Field emission scanning electron microscope, FE-SEM)을 사용하여 표면 형상을 확인하였다. 시멘트 패널평가는 KS LISO 679에 준하여 패널 제작 및 패널의 압축강도와 휨강도를 측정하였다. Mineral carbonation is a technology in which carbonates are synthesized from minerals including serpentine and olivine, and industrial wastes such as slag and cement, of which all contain calcium or magnesium when reacted with carbon dioxide. This study aims to develop the mineral carbonation technology for commercialization, which can reduce environmental burden and process cost through the reduction of carbon dioxide using steel slag and the slag reuse after calcium extraction. Calcium extraction was conducted using NH<sub>4</sub>Cl solution for air-cooled slag and convert slag, and ≥ 98% purity calcium carbonate was synthesized by reaction with calcium-extracted solution and carbon dioxide. And we conducted experimentally to minimize the quantity of by-product, the slag residue after calcium extraction, which has occupied large amount of weight ratio (about 80-90%) at the point of mineral carbonation process using slag. The slag residue was used to replace silica sand in the manufacture of cement panel, and physical properties including compressive strength and flexible strength of panel using the slag residue and normal cement panel, respectively, were analyzed. The calcium concentration in extraction solution was analyzed by inductively coupled plasma optical emission spectrometer (ICP-OES). Field-emission scanning electron microscope (FE-SEM) was also used to identify the surface morphology of calcium carbonate, and XRD was used to analyze the crystallinity and the quantitative analysis of calcium carbonate. In addition, the cement panel evaluation was carried out according to KS L ISO 679, and the compressive strength and flexural strength of the panels were measured.
한수정,최재영,Yeongsuk Yoo,정의창,이승호 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.3
Particle size is one of the important parameters that determine the characteristics (and applicability) of silica nanoparticles. An accurate sizing technique is therefore required for quality control during the synthesis of silica nanoparticles. Unlike other sizing techniques, the field-flow fractionation (FFF) provides size-based separation of colloidal particles, and allows an FFF elution profile, which can be converted to a size distribution directly. Synthesis of silica nanoparticles having narrow size distributions is not trivial, as there are many parameters affecting the characteristics of the synthesized particles. In this study, silica nanoparticles were synthesized by emulsion polymerization, where ethanol, ammonium hydroxide, and tetraethyl orthosilicate (TEOS) were mixed at room temperature. First, silica nanoparticles were synthesized in a smaller scale with a total reaction volume of 175 mL. Then the effect of various reaction parameters on the particle size distribution (PSD) was systematically investigated using asymmetrical flow FFF (AF4), a member of FFF family. The synthesis scale was then increased to the total reaction volume of 3 L. It was observed that, as the concentrations of TEOS and ethanol increased, the size of the silica nanoparticles tended to decrease, while as the concentration of ammonium hydroxide increased, the size tended to increase. Silica nanoparticles of about 100 nm having a relatively narrow size distribution could be obtained in a large scale with the concentrations of TEOS, ethanol, and ammonia solution of 95, 95, and 15%, respectively. The results suggest that AF4 is a useful tool for fast and accurate size monitoring of silica nanoparticles.