A5101487515- Lignin and Wood Chemistry
- Adsorption and biosorption for pollutant removal
- Bone Tissue Engineering Materials
- Orthopaedic implants and arthroplasty
- Advanced Cellulose Research Studies
- Engineering Applied Research
- Supercapacitor Materials and Fabrication
- Enzyme-mediated dye degradation
- Advanced MEMS and NEMS Technologies
- Conducting polymers and applications
- Nanomaterials for catalytic reactions
- Electrospun Nanofibers in Biomedical Applications
- Fiber-reinforced polymer composites
- Electrocatalysts for Energy Conversion
- Mesoporous Materials and Catalysis
- Advanced Surface Polishing Techniques
- Polyoxometalates: Synthesis and Applications
- Nanocomposite Films for Food Packaging
- Polymer composites and self-healing
- Catalysis and Hydrodesulfurization Studies
- Biochemical and biochemical processes
- biodegradable polymer synthesis and properties
- Catalytic Processes in Materials Science
- Titanium Alloys Microstructure and Properties
- Thermochemical Biomass Conversion Processes
Kangwon National University
2018-2024
Eulji University Hospital
2024
National Institute of Standards and Technology
2000-2020
Catholic University of Korea
2019-2020
Seoul St. Mary's Hospital
2010-2020
Korea Research Institute of Bioscience and Biotechnology
2018
Korea Forest Service
2013-2017
Forest Research Institute
2015
Korea University
2012
University of British Columbia
2007-2010
Copolymerization of N-isopropylacrylamide (NIPAM) with technical hardwood kraft lignin (HWKL) was achieved by atom transfer radical polymerization (ATRP) using a selectively modified lignin-based macroinitiator. The degree (DP) polyNIPAM graft side chains affected varying the ratio DMF/water solvent system from 5:0 to 0:5, and an estimated DP(NIPAM) >40 obtained 1:4 (v/v). thermal decomposition temperature lignin-g-polyNIPAM copolymers significantly increased increasing DP(NIPAM). Likewise,...
Lignin is a type of biomass that generally found in nature and has wide range applications as functional material. A novel sorbent, aminated lignin (AL), was synthesized one-step method to improve its adsorption capabilities. The AL characterized through Brunauer–Emmett–Teller surface area analysis, thermogravimetric scanning electron microscopy, zeta potential analysis. small size had clear obvious porous structure with 47.1 m2·g−1, nearly ten times larger than kraft lignin, which 4.75...
A silver nanoparticle is one of the representative engineered nanomaterials with excellent optical, electrical, antibacterial properties. Silver nanoparticles are being increasingly used for medical products, water filters, and cosmetics, etc. However, known to cause adverse effects on ecosystem human health. To utilize minimized negative effects, it important understand behavior released environment. In this study, we compared toxicity behaviors citrate-stabilized polyethylene glycol coated...
Graft copolymerization of styrene onto kraft lignin (KL) was achieved by atom transfer radical polymerization (ATRP) using a fully substituted lignin-based macroinitiator (KLM). The number average molecular mass (Mn) polystyrene copolymer graft side-chains varying the ratio DMF: water solvent system from 5:0 to 1:4. A Mn up ∼206,000 obtained DMF/water 3:2 (v/v). However, as increased, overall ATRP became less controlled. In addition, thermal properties lignin-g-polystyrene copolymers...
Abstract Lignin-based electrospun nanofibers (eNFs) were prepared and thermally stabilized at 250°C subsequently carbonized 1400°C. The starting blend was in dimethyl formamide (DMF) solution with lignin polyacrylonitrile (PAN), while a lignin-grafted-PAN (L-g-PAN) copolymer served as compatibilizer. viscosity highest of the DMF PAN, decreased for lignin/PAN blends additionally presence L-g-PAN. uniform eNFs clean surfaces dispose diameters between 400 nm 1 μm. average diameter by thermal...
In this study, a novel zwitterion-substituted lignin (ZL) containing amino and sulfonic acid groups was synthesized, ZL/Nafion composite membranes were fabricated as proton exchange membranes. Kraft modified using an aminosilane 1,3-propanesultone via continuous grafting reaction to provide zwitterionic moieties. Chemical structural analyses confirmed the successful introduction of zwitterion moiety into lignin. particular, surface charge ZL is positive in acidic medium negative basic...
Lignin, renowned for its abundance of hydroxyl groups, was utilized in three dimensions to fabricate a hydrogel matrix. In this study, the optimal conditions preparation lignin-crosslinked and potential dye antioxidant removal were investigated. The synthesized through cross-linking reaction, with varying amounts agent (poly(ethylene glycol) diglycidyl ether) added adjust lignin content. Chemical structure analysis conducted using Fourier-transform infrared spectroscopy X-ray photoelectron...
The scale of nano-sized objects requires very precise position determination. state-of-the-art manipulators involve accurate nanometer positioning. This paper presents the design, fabrication process, and testing a capacitance-based displacement sensor. nanopositioner application required active sensing area dimensions to be hundreds micrometers, making it necessary develop sensor electrodes that are few micrometers in size. advantages presented its noninvasive method low voltage for signal...
Graphical Abstract Biosorbent from cellulose nanofibrils grafted with poly(m-aminobenzene sulfonate) (PABS) was prepared for effective detoxification and adsorption of Cr(VI) in an aqueous medium.
A green, effective, and feasible reaction for esterification of lignin with oleic acid in water at room temperature was investigated. surfactant-combined system (p-toluenesulfonic acid/4-dodecylbenzenesulfonic acid) designed to simultaneously solubilize kraft disperse the acid, producing microreactors esterification. Esterification using a higher 4-dodecylbenzenesulfonic dosage found be good option, an increasing had no effect on improving degree Structural characterization analyses...