Seoul National University · Engineering
Professor Kyudeok Oh's research lab specializes in the development and application of sustainable biomaterials, particularly cellulose-based nanomaterials such as cellulose nanofibrils (CNF), for advanced paper and coating technologies. The lab focuses on understanding the rheological behavior, structural formation, and functional properties of paper coatings, with an emphasis on improving printability, surface characteristics, and mechanical performance. Key research directions include the use of CNF and synthetic polymers like carboxymethyl cellulose (CMC) to control coating shrinkage, pore structure, and water retention during drying, as well as exploring novel applications such as paper-based SERS sensors. The lab also investigates the role of latex binders with tunable glass transition temperatures in shaping coating morphology and performance.
Figures are computed from collected data and may differ slightly.
The dried structure of paints and coatings are important to understand. In paper coatings, pigments and binder types are known to influence this structure. The influence of a new additive such as cellulose nanofibrils (CNF) on the interaction between the coating components is not thoroughly examined. In this study, the effect of CNF on the rheology of coating color and structure formation of the coating layer was investigated and compared to that of carboxymethyl cellulose (CMC). The addition of
The effects of cellulose nanofibrils (CNFs) and carboxymethyl cellulose (CMC) on the shrinkage and surface characteristics of a pigment coating layer were compared. The shrinkage of the coating layer caused by evaporation of the aqueous phase during the drying process was measured using the beam-deflection method. CMC increased drying stress via rapid immobilization of the wet coating with precipitation of the CMC molecules. However, the coating that contained CNF had a much lower stress level b
The pore structure of the coating layer is one of the most important factors in determining the printability of coated papers. The coating pigment and binder are two principal components in paper coating, and their characteristics have a critical influence on the coating structure. The glass transition temperature (Tg) of latex binders affects the mechanical strength and pore structure of the pigment coating layer because the latex Tg influences the binding ability of latex and the shrinkage of
Cellulose nanofibrils (CNF) derived from wood can be used as thickening agents for suspensions or slurries because they form a gel structure by absorbing water and demonstrate an excellent shear thinning behavior. When used as a thickening agent for paper coating, CNF influences the rheological properties and water retention of the coating color, affecting the properties of the coated paper. In this study, the effects of CNF and carboxymethyl cellulose (CMC) on the properties of the coated paper
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