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콤포질 시스템의 보류 및 탈수특성과 양성 옥수수전분을 이용한 성능 개선
이학래,김태영,윤혜정 한국펄프종이공학회 1998 펄프.종이기술 Vol.30 No.2
Effect of cationic starches and anionic colloidal silica on retention and drainage characteristics of Compozil system was investigated. Depending upon the degree of substitution and molecular weight of cationic starches and morphological characteristics of anionic colloidal silica, retention and drainage properties of Compozil system were significantly influenced. When cationic starch addition level increased above a certain limit retention and stock freeness were decreased. To elucidate this an electrostatic coagulation mechanism occurring between unadsorbed starch molecules and anionic colloidal silica was proposed. Unstructured colloidal silica showed greater improvement in retention than structured colloidal silica. Cationic corn starches with different degree of substitution and molecular weights were prepared and their effect as a constituent of Compozil system was also evaluated. By controlling the molecular weight and degree of substitution of cationic corn starch it was possible to achieve significant improvement in fines retention. Cationic corn starch with higher degree of substitution maintained its retention efficiency even when the stock conductivity was increased. Turbidity measurement technique was found to be a simple and useful method to measure the retention characteristics.
인버스 가스 크로마토 그래피를 이용한 소수화된 MCC의 표면 특성 분석
이학래,이용민,박일,이진희,조중연,한신호,Lee, Hak-Rae,Lee, Yong-Min,Park, Il,Lee, Jin-Hee,Cho, Joong-Yeon,Han, Sin-Ho 한국펄프종이공학회 2002 펄프.종이기술 Vol.34 No.3
The adsorption characteristics and surface energetics of hydrophobically modified MCC have been investigated by the inverse gas chromatography technique at infinite dilution. The thermodynamic parameters of adsorption, ΔG, ΔH and ΔS, for n-alkanes were determined at infinite dilution. Heats of adsoption of the n-alkanes increased as the level of hydrophobic modification increased. The hydrophobically modified MCC also showed greater entropy of adsorption indicating restricted mobility of the adsorbed n-alkanes. The acid/base characteristics of the MCC were evaluated using polar probes. As the hydrophobicity of MCC increased, the basisity of the MCC decreased.
이학래,성용주 한국펄프종이공학회 1997 펄프.종이기술 Vol.29 No.2
High shear viscosity at several solids levels was measured for a number of pigment slurries and coating colors containing either anionic or amphoteric latex and analyzed according to Mooney and Eiler equations. Maximum packing fraction and intrinsic viscosity were obtained and compared. Eiler equation provides more credible information than Mooney equation on particle packing and intrinsic viscosity. The packing fraction obtained from Eiler equation was slightly greater than that obtained from static FCC measurement indicating the influence of pigment movement under the dynamic condition. Amphoteric latex caused 4-5% increase of maximum packing fraction of a coating color when its pH is lowered from 7 to 6, while anionic latex did not show any significant change in packing characteristics.
이학래,김영환,김성원,방석호,김재혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We developed new vehicles for aqueous phase photon upconversion using a post-encapsulation strategy with hollow mesoporous silica microcapsules. The prepared silica microcapsules possess tunable diameters, large interior cavities, and ordered radial mesochannels that favor the controlled encapsulation of guest molecules. The upconversion oil is readily encapsulated at high loadings into the microcapsules. We successfully demonstrated cell-mediated triplet-triplet annihilation upconversion system by incorporating our microcapsules with human mesenchymal stem cells, which showed promise system for tumortargeted low-power bioimaging. To the best of our knowledge, this study is the first to design biocompatible triplet-triplet annihilation upconversion system with a post-encapsulation strategy and diverse functionalities, thereby establishing a new and general platform to achieve efficient aqueous phase triplet-triplet annihilation upconversion system for multifunctional applications.