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3D Printed Poly lactic acid Scaffolds containing Dipyridamole, Mimicking Tetrapod structure
최인성,최성욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
We produced a poly lactic acid (PLA) filament containing dipyridamole (DIP), and then printing a scaffold with tetrapod-interlocking structure through a fused deposition modeling (FDM) printer. The Tetrapod-interlocking structure was designed through CAD and converted to G-code using the slic3r slicing program. Mechanical properties of the prepared scaffolds were measured via universal testing machine. The tetrapod and cubic structures showed similar compressive stress endurance. Tetrapod and cubic structures showed similar compression stress endurance, but tetrapod scapold showed more flexibility. The interlocked structure showed better stress resistance and flexibility than tetrapod scaffold, preventing sudden breakage and providing more compressive endurance. PLA scaffolds consistently released DIP over time and had a positive effect on osteoblast proliferation. Overall, we believe that DIP / PLA tetrapod-interlocked scaffolds can be used for bone tissue engineering.
최인성,최성욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The water-dispersible nanodiamond (ND) clusters with blue fluorescence were fabricated for cellular bioimaging. Poly(ethylene glycol) carboxyl methyl acid (mPEG-COOH) The relative fluorescence intensity was increased with the increases in the chain length of alkyl isocyanate and also their conjugated concentration and alkylisocyanates were conjugated onto the surface of the ND clusters for water dispersibility and fluorescence. The relative fluorescence intensity increased with the the chain length of alkyl isocyanate and their conjugated concentration. The ND clusters with mPEG-COOH and octadecyl iso-cyanate (ODI) emitted relatively higher blue fluorescence intensity under excitation at 350 nm as well as advantageous water dispersibility. The mPEG-ND-ODI exhibited the suitable size for bioimaging, excellent cell viability, high blue fluorescence, and long-term water dispersibility.
소형원자로 내식성 향상을 위한 Alloy 82 분말의 레이저 클래딩 연구
최인성,정원찬,송단비,서정,이광현,김용재,정인철 대한금속·재료학회 2023 대한금속·재료학회지 Vol.61 No.8
There has been an increased demand for surface modification technologies to enhance corrosionresistanceand wear-resistance. Among the representative surface coating technologies, laser cladding hasattracted great attention because of its multiple advantages including low heat input, low dilution ratio,controllable clad height, etc. Recently, laser cladding has been considered as a surface coating technology forthe next-generation small modular reactor, although submerged arc welding was utilized for the 3rdgeneration nuclear reactor. Cobalt-free materials are required as cladding materials in the nuclear reactorbecause cobalt has a long half-life. In this work, nickel based cobalt-free Alloy 82 powder was utilized. Themain experimental parameters for laser cladding were intensively investigated by varying laser power, scanspeed, powder supply, carrier and shield gas, overlap ratio, etc. Additionally, cross-sectional area calculationand EPMA analysis were carried out to examine the dilution ratio. Mechanical properties were also evaluatedusing microhardness tests and wear tests at high temperatures. Finally, corrosion tests were performed tocompare a laser clad surface with an uncoated carbon steel surface. Our study indicates that the laser claddingusing Alloy 82 powder is feasible for corrosion protection in next-generation small modular reactors.
Electrochemically Inducible Surfaces for Patterning Two Distinct Molecules
최인성,여운석 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4
Herein, we report on a new multicomponent patterning method based on electrochemically inducible self-assembled monolayers on gold. Two different masked functional groups on monolayers are activated to give amine and acetylene moieties through electrochemical activations at negative potential and positive potential, respectively. The resulting amine and acetylene groups are further used as chemical handles for incorporation of ligand molecules via well-known chemoselective conjugation reactions such as amine-specific conjugation chemistry and click reaction. The chemical conversions of masked functional groups to amine and acetylene groups were characterized by cyclic voltammetry. We demonstrated the orthogonal immobilization of two fluorescent dyes on the patterned surface along the patterned features. Our strategy can provide a useful platform technology for the preparation of multicomponent ligand-patterned substrates with various advantages such as chemical flexibility, mild reaction conditions, and high yields of two orthogonal chemical reactions of amine-specific conjugation and click reaction.