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Fabrication of Stimuli-responsive Nanofiber and Nanoparticles via Electrospinning/Electrospray
이호익 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
We demonstrate an electrospray/electrospinning process to fabricate stimuli-responsive nanofibers or particles that can be utilized as stimuli-responsive drug-loaded materials. A series of random copolymers consisting of hydrophobic ferrocene monomers and hydrophilic carboxyl groups was synthesized with free radical copolymerization. The morphologies of the resulting objects were electively varied from particulate to fibrous structures by control of the composition, suggesting that the morphology of electro sprayed/ electro spun copolymer objects was governed by its composition highlighting the significance of the balance of hydrophilicity/hydrophobicity of the copolymer chain to the assembled structure. Resulting particles and nanofibers exhibited preserved responsiveness to reactive oxygen species during the deposition process, opening up the potential to fabricate ROS-sensitive material with various desirable structures toward different applications.
Thiol-functionalized cellulose nanofiber membranes for the adsorption of heavy metal ions in water
이호익 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
This work reports the fabrication of a thiol-functionalized cellulose nanofiber that can effectively adsorb heavy metal ions. Thiol was incorporated onto the surface of cellulose nanofibers and subsequent esterification of a thiol precursor molecule. Adsorption mechanism was investigated using adsorption isotherms. Adsorption capacity as a function of adsorbate concentration was described well with Langmuir isotherm, suggesting that metal ions form a surface monolayer with a homogenously distributed adsorption energy.The time dependent adsorption capacities followed a pseudo-second-order kinetic model, suggesting that chemisorption of each doubly charged metal ion occurs with two thiol groups on the surface. These results highlight the significance of surface functionality on biocompatible and sustainable cellulose materials to expand their potential and applicability towards water remediation applications.