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곽채수,유승영,박현수,임세형,양지원,김지은,김진형,이주형 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Complex fluids including colloidal dispersions and Pickering emulsions, with suitable properties, can be useful platforms for advanced printing processes including 3D printing. With increasing demands for eco-friendly printing materials, we investigated the 3D printability of complex fluids containing green algae (chlorella) grains provided by nature. It was found that the Pickering emulsions with the dispersed oil phase exhibited much better printability than the simple aqueous chlorella dispersion. Herein, we present the results of a systematic study on the rheological properties of chlorella-stabilized Pickering emulsions as 3D printing inks.
곽채수,박현수,김준혁,임세형,양지원,김지은,김지은,이준협,이주형 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
Phase change material emulsions (PCMEs) are an attractive two-phase heat transfer fluid where the PCMs that can store or release latent heat during their phase change at a desired temperature are dispersed in the form of fine droplets in a carrier fluid. The majority of the PCMEs were prepared previously by using organic molecular surfactants, some of which might possess health and environmental risks. Herein, we demonstrate the surfactant-free fabrication of docosane (C22H46)-based PCMEs by utilizing various mineral oxide nanoparticles (MONPs) as Pickering emulsifiers, which show promising thermal properties.
곽채수,박현수,김준혁,임세형,양지원,김지은,김지은,이준협,이주형 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Phase change material emulsions (PCMEs) are an attractive two-phase heat transfer fluid where the PCMs that can store or release latent heats during their phase change at a desired temperature are dispersed in the form of fine droplets in a carrier fluid. The majority of the PCMEs were prepared previously by using organic molecular surfactants, some of which might possess health and environmental risks. Herein, we demonstrate the surfactant-free fabrication of docosane (C<sub>22</sub>H<sub>46</sub>)-based PCMEs by utilizing various mineral oxide nanoparticles (MONPs) as Pickering emulsifiers, which showed promising thermal properties.
박현수,곽채수,이준수,임세형,양지원,김지은,김진효,유승영,나현빈,이주형 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Phase change materials (PCMs) have recently gained significant attention for effective latent heat thermal energy storage. So far, diverse methods for encapsulation of PCMs have been introduced, including interfacial polymerization or sol-gel reaction, which were sometimes achieved via microfluidic droplet generation. Herein, we demonstrate a facile way of producing sub-micron PCM nanocapsules in bulk, composed of n-docosane (C<sub>22</sub>H<sub>46</sub>; core) and crosslinked polyethylene glycol (PEG; shell). The encapsulation is achieved through spontaneous spreading of liquid PEG diacrylate (phase 1) on melted n-docosane nanodroplets (phase 2) dispersed in bulk aqueous media (phase 3), which is thermodynamically driven by the relation between the surface energies of the phase 1, 2, and 3. The as-produced PCM nanocapsules displayed high durability in repeated heating-cooling cycles, and showed promising thermal performances.
양지원,곽채수,김지은,박현수,임세형,이주형 한국고분자학회 2020 Macromolecular Research Vol.28 No.3
Plant-based pollens have recently received significant attention in various fields owing to their numerous potential advantages including their unique architecture, mechanical strength, and high resistance to chemical attacks and biological degradation. In this study, we demonstrate viscoelastic Pickering emulsions of water and oil (trimethylolpropane trimethacrylate) stabilized by naturally occurring bee pollen microparticles. We systematically investigate the rheological properties of the pollen-stabilized emulsions with various pollen concentrations and water-to-oil ratios. It is observed that the emulsions prepared at a high pollen loading and an appropriate water-to-oil ratio show excellent shape retention and shear-thinning behaviors. The results suggest the possibility of utilizing pollen-stabilized Pickering emulsions for several applications including direct ink writing.
양지원,김지은,곽채수,박현수,임세형,유승영,이주형 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Capillary suspensions are ternary solid-liquid-liquid systems produced via the addition of a small amount of secondary fluid to the bulk fluid that contained the dispersed solid particles. The secondary fluid could exert strong capillary forces between the particles and dramatically change the rheological properties of the suspension. So far, research has focused on capillary suspensions that consist of additive-free fluids, whereas capillary suspensions with additives, particularly those of large molecular weight that are highly relevant for industrial purposes, have been relatively less studied. Here, we present our systematic study on the properties of capillary suspensions with secondary phases containing a variety of water-soluble polymers.
박현수,임세형,양지원,곽채수,김지은,최신식,김채빈,이주형 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Nanoparticles (NPs) may have great potential for various subsurface applications over the past decades. One of the important challenges for these applications is to achieve colloidal stability in subsurface media at high salinity and high temperature. It has been previously shown that NPs “multipoint”-grafted with anionic poly(AMPS-co-AA) exhibited remarkable colloidal stabilities in certain salinity such as API brine. However, many other important properties of such particles still remain unstudied. Herein, we investigate various properties of the silica (SiO<sub>2</sub>) NPs “multipoint”-grafted with poly(AMPS-co-AA) in NaCl and CaCl<sub>2</sub> solutions. The brush behavior of the grafted random copolymers was investigated through wide range of salinities. The particles displayed brine-oil interfacial activity with increasing salt concentrations (C<sub>s</sub>), stabilizing oil-in-brine emulsions. High internal phase emulsion (HIPE) could be formed in high C<sub>s</sub> of CaCl<sub>2</sub>, which exhibited gel-like behavior.
임세형,박현수,김진형,양지원,곽채수,김지은,유승영,이주형 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
MXenes are recently gaining significant attention for numerous environmental applications owing to their superior hydrophilicity and unique surface functionalities. However, the use of MXenes for in-situ remediation of contaminated subsurface aquatic environments has not been considered yet. For effective in-situ remediation, it is of primary importance to maintain colloidal stability in harsh subsurface environments. Herein, Ti3C2-MXenes covalently grafted with polyelectrolytes (PEs), MXene-g-PEs, are developed by employing either anionic or zwitterionic PEs. Both MXene-g-PEs have sufficient colloidal stability against the immediate and irreversible aggregation observed for the pristine MXenes in API brines. The MXenes-g-(zwitterionic) PEs show long-term colloidal stability over 6 months in API brine with extreme salinity and little adsorption against α-alumina surfaces. The results suggest a high potential usefulness of the MXene-g-PEs in various subsurface applications.