@article{cho_kim_kim_cho_kwak_koo_choi_2024, title={Alkyl bicyclo[2.2.2]octanes as high-energy-density bio-aviation fuel}, volume={254}, ISSN={["1873-7188"]}, DOI={10.1016/j.fuproc.2024.108047}, abstractNote={This study focuses on developing a new class of high energy density (HED) bio-aviation fuel. Alkyl bicyclo[2.2.2]octanes (ABCOs) were designed as potential HED aviation fuel, and a C12 ABCOs mixture was synthesized from renewable resources (α-phellandrene and maleic anhydride) using the Diels–Alder cycloaddition followed by hydrotreating. The synthesized ABCOs exhibited favorable fuel properties as HED fuel, including a gravimetric net heat of combustion comparable to Jet A-1 and higher density and volumetric net heat of combustion. ABCOs standalone showed poor low-temperature viscosities than Jet A-1 specifications but demonstrated no freezing behaviors even at extremely low temperatures. Fuel properties after blending ABCOs with Jet-A1 were also investigated, determining an upper limit of blending ratio of 44.1 vol%. These findings suggest that ABCOs can serve as a promising drop-in fuel for conventional jet fuel, while also potentially contributing to the formulation of bio-based and zero-aromatic high-performance jet fuels as a density-increasing component.}, journal={FUEL PROCESSING TECHNOLOGY}, author={Cho, Seong-Min and Kim, Jong -Chan and Kim, Jonghwa and Cho, Young -Min and Kwak, Hyo Won and Koo, Bonwook and Choi, In-Gyu}, year={2024}, month={Feb} }
 @article{cho_chang_park_2024, title={Effects of hydrogen peroxide and sodium nitrate on microwave-assisted polyethylene oxidative degradation in the presence of nitric acid}, volume={499}, ISSN={["1873-3212"]}, DOI={10.1016/j.cej.2024.155769}, journal={CHEMICAL ENGINEERING JOURNAL}, author={Cho, Seong-Min and Chang, Hou-min and Park, Sunkyu}, year={2024}, month={Nov} }
 @article{park_yoo_cho_park_cruz_kelley_park_2024, title={Exploring potential of cellulose acetate sulfate films for sustainable packaging: tuning characteristics via sulfate group variation}, volume={1}, ISSN={["1572-882X"]}, DOI={10.1007/s10570-023-05713-8}, journal={CELLULOSE}, author={Park, Seonghyun and Yoo, Seunghyun and Cho, Seong-Min and Park, Hyeonji and Cruz, David and Kelley, Stephen S. and Park, Sunkyu}, year={2024}, month={Jan} }
 @article{park_sharmin_cho_kelley_shirwaiker_park_2024, title={Single-Component Cellulose Acetate Sulfate Hydrogels for Direct Ink Writing 3D Printing}, volume={8}, ISSN={["1526-4602"]}, url={https://pubs.acs.org/doi/full/10.1021/acs.biomac.4c00578}, DOI={10.1021/acs.biomac.4c00578}, abstractNote={Hydrogels, typically favored for 3D printing due to their viscoelasticity, are now trending toward ecofriendly alternatives amid growing environmental concerns. In this study, we crafted cellulose-based hydrogels, specifically employing cellulose acetate sulfate (CAS). By keeping the acetyl group substitution degree (DSacetyl = 1.8) and CAS molecular weight constant, we varied rheological properties by adjusting sulfate group substitution (DSsulfate = 0.4, 0.7, and 1.0) and CAS concentration (2–5 wt %). Rheological characterizations, including shear-thinning, yield stress, and thixotropy, were performed to identify optimal conditions for formulating CAS hydrogel ink in direct ink writing for 3D printing under selected experimental conditions. Based on rheological findings, CAS hydrogels with DSsulfate 0.7 and concentration of 4 wt % was used for 3D printing, with subsequent evaluation of printing metrics. Additionally, the effect of ionic cross-linking using Ca2+ ions on the structural integrity of 3D-printed structures was evaluated, demonstrating effective preservation through reinforced polymer networks. The shrinking and swelling behaviors of the 3D-printed structures were also significantly affected by this ionic cross-linking. Building on these findings, this work could broaden the range of cellulose derivatives available for the preparation of cellulose-based hydrogels for 3D printing.}, journal={BIOMACROMOLECULES}, author={Park, Seonghyun and Sharmin, Tavila and Cho, Seong-Min and Kelley, Stephen S. and Shirwaiker, Rohan A. and Park, Sunkyu}, year={2024}, month={Aug} }
 @article{kim_kim_cho_cho_hwang_kwak_yeo_choi_2023, title={Fabrication of transparent cellulose nanofibril composite film with smooth surface and ultraviolet blocking ability using hydrophilic lignin}, volume={245}, ISSN={["1879-0003"]}, DOI={10.1016/j.ijbiomac.2023.125545}, abstractNote={Ecofriendly multifunctional films with only biomass-based components have gathered significant interest from researchers as next-generation materials. Following this trend, a TEMPO-oxidized cellulose nanofibril (TOCNF) film containing hydrophilic lignin (CL) was fabricated. To produce the lignin, peracetic acid oxidation was carried out, leading to the introduction of carboxyl groups into the lignin structure. By adding hydrophilic lignin, various characteristics (e.g., surface smoothness, UV protection, antimicrobial activity, and barrier properties) of the TOCNF film were enhanced. In particular, the shrinkage of CNF was successfully prevented by the addition of CL, which is attributed to the lower surface roughness (Ra) from 18.93 nm to 4.99 nm. As a result, the smooth surface of the TOCNF/CL film was shown compared to neat TOCNF film and TOCNF/Kraft lignin composite film. In addition, the TOCNF/CL film showed a superior UV blocking ability of 99.9 % with high transparency of 78.4 %, which is higher than that of CNF-lignin composite films in other research. Also, water vapor transmission rate was reduced after adding CL to TOCNF film. Consequently, the developed TOCNF/CL film can be potentially utilized in various applications, such as food packaging.}, journal={INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES}, author={Kim, Jong-Chan and Kim, Jonghwa and Cho, Young-Min and Cho, Seong-Min and Hwang, Sung-Wook and Kwak, Hyo Won and Yeo, Hwanmyeong and Choi, In-Gyu}, year={2023}, month={Aug} }
 @article{park_yoo_cho_kelley_park_2023, title={Production of single-component cellulose-based hydrogel and its utilization as adsorbent for aqueous contaminants}, volume={243}, ISSN={["1879-0003"]}, DOI={10.1016/j.ijbiomac.2023.125085}, abstractNote={The growing concern for the environment has resulted in renewed interest in bio-based resources. This study aims to produce a hydrogel adsorbent from cellulose and examine its adsorption performance. In pursuit of this goal, we report a simple one-pot synthesis of cellulose acetate sulfate (CAS), followed by the formation of CAS hydrogels and their subsequent adsorption performances. The CAS includes both hydrophilic and hydrophobic functional groups, enable the formation of a single-component hydrogel through intermolecular interactions in deionized water. The thermal reversibility of CAS hydrogels makes them easily processable into various shapes. The durability of the CAS hydrogel adsorbents can be improved by introducing divalent cations (e.g., Ca2+), which create ionically crosslinked hydrogels. The ionically a crosslinked CAS hydrogel adsorbent exhibits a maximum adsorption capacity of 245 mg/g for methylene blue (MB) at 23 °C and a pH of 7. The adsorption behavior of MB on the CAS hydrogel follows both the pseudo-second-order model and the Langmuir adsorption isotherm model. Furthermore, the CAS hydrogel adsorbent maintains a 70 % removal ratio after five cycles. The simplicity of synthesis and hydrogel formation opens up new possibilities for producing and utilizing cellulose-based hydrogels as adsorbents for aqueous contaminants.}, journal={INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES}, author={Park, Seonghyun and Yoo, Seunghyun and Cho, Seong-Min and Kelley, Stephen S. and Park, Sunkyu}, year={2023}, month={Jul} }
 @article{cho_kim_choi_kim_cho_park_kwak_choi_2023, title={Physicochemical characteristics of lignin-g-PMMA/PLA blend via atom transfer radical polymerization depending on the structural difference of organosolv lignin}, volume={226}, ISSN={["1879-0003"]}, DOI={10.1016/j.ijbiomac.2022.11.316}, abstractNote={Lignin has different structural characteristics depending on the extraction conditions. In this study, three types of ethanol organosolv lignin (EOL) were produced under different extraction conditions involving the reaction temperature (140, 160, 180 °C), sulfuric acid concentration (0.5, 1, 1.5 %), and ethanol concentration (40, 60, 80 %) to compare the difference in properties when mixed with polylactic acid (PLA) matrix after atom transfer radical polymerization (ATRP). ATRP of EOL was conducted to improve its compatibility with PLA using methyl methacrylate (MMA) as a monomer. The molecular weight of each EOL increased significantly, and the glass transition temperature (Tg) decreased from approximately 150 to 110 °C. The EOL-g-PMMA copolymer exhibited a melting point (Tm), whereas EOL did not, implying that the thermoplasticity increased. The EOL-g-PMMA/PLA blend and film were prepared with 10 % of the copolymer in the PLA matrix. The tensile strength and strain of the blend were higher than those of unmodified organosolv lignin as the compatibility increased, and the UV transmittance was lower than that of neat PLA because of the UV protecting properties of EOL moiety.}, journal={INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES}, author={Cho, Young -Min and Kim, Jong-Hwa and Choi, June-Ho and Kim, Jong-Chan and Cho, Seong-Min and Park, Sang-Woo and Kwak, Hyo Won and Choi, In-Gyu}, year={2023}, month={Jan}, pages={279–290} }