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이봉수,최인성 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
SI-ARGET ATRP of monomers containing 2-aminoethyl methacrylate hydrochloride and oligo(ethylene glycol) methacrylate has performed on a gold presenting ATRP initiators, and subsequently the poly(AMA-r-OEGMA) films was coupled with biotin containing N-hydroxysuccinimide esters (Biotin-NHS), resulting in biotinylated, poly(AMA-r-OEGMA) films. The microcontact printing of Biotin-NHS via PDMS stamping and subsequent incubation of the patterned films in rhodamine- conjugated streptavidin solution was performed on biotinylated, poly(AMA-r-OEGMA) films and the micropatterns of proteins were observed via confocal microscopy.
Synthesis and Antibacterial Activities of Boronic Acid-Based Recyclable Spherical Polymer Brushes
Hüseyin Cicek,Gökhan Kocak,Özgür Ceylan,Vural Bütün 한국고분자학회 2019 Macromolecular Research Vol.27 No.7
Crosslinked poly(4-vinylbenzyl chloride) (PVBC) microbead was prepared by suspension polymerization. Various spherical polymer brushes (SPBs) were produced by grafting polymeric chains on their surfaces via surface initiated-atom transfer radical polymerization (SI-ATRP) using 4-vinylphenyl boronic acid (VPBA), 2- (dimethylamino)ethyl methacrylate (DMA), and quaternized DMA (QDMA). PVBCg- PDMA, PVBC-g-PQDMA, PVBC-g-PVPBA, PVBC-g-P(VPBA-b-DMA), PVBC-g-P(VPBAco- DMA) and PVBC-g-P(VPBA-b-QDMA) SPBs were characterized using nuclear magnetic resonance spectroscopy, attenuated total reflection Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Antibacterial activities of the synthesized SPBs were investigated against Escherichia coli and Staphylococcus aureus in nutrient and nutrient free media. Although PVBC-g-P(VPBA-b-DMA) SPB provided high antibacterial activity in the nutrient containing media due to its antibacterial, anti-biofilm and anti-QS properties, PVBC-g-P8QDMA SPB was found to be more effective in nutrient free media. Considering repeatable antibacterial activity, the PVBC-g-P(VPBA-b-8QDMA) SPB has advantageous over PVBC-g-P(VPBA-b-DMA) and PVBC-g-P8QDMA SPBs for long-term applications such as wastewater treatment in fluidized bad system.
Miroslav Mrlík,Markéta Ilčíková,Tomáš Plachý,Robert Moučka,Vladimír Pavlínek,Jaroslav Mosnáček 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
This article is focused on the controllable reduction of the graphene oxide (GO) particles as asimultaneous process during surface initiated atom transfer radical polymerization (SI-ATRP) providinghybrid particles with tailored conductivity and substantial polymer shell on the particles tunable by SIATRPconditions. The main advantage of such approach is that both the compatibility improvement, dueto the polymer layer, and conductivity tuning, due to partial GO reduction, were simply achieved insingle-step reaction providing electrorheological (ER) system with enhanced performance in comparisonto either neat GO or similar non-covalently bonded GO-polymer hybrids. The presence of the poly(glycidyl methacrylate) (PGMA) on the surface of GO was investigated using FTIR spectrometry,transmission electron microscopy and thermogravimetric analysis and their chain length (Mw) andpolydispersity index (PDI) were determined by 1H NMR and GPC, respectively. Two different GO-PGMAparticle systems varied in Mw and PDI and also in electrical conductivities were prepared and theirelectro-responsive capabilities were investigated. The reduction of GO particles was confirmed by Ramanshift as well as conductivity measurements. Electrorheological (ER) performance was investigated atvarious electricfield strengths and repeatability of the phenomenon was confirmed by 10 on/offfieldcycles. Finally, with the help of dielectric measurements of GO-PGMA based ER suspensions,fitted byHavriliak–Negami model, the relaxation processes were properly investigated and the results werecorrelated with those obtained from electrorheological measurements.
이지은,김동하 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Bimetallic Core@shell nanoparticles have demonstrated distinctly different properties and potential uses in electronics, magnetics, catalysts, optics, and sensors. Their versatility in a wide range of applications stems from their unique physical and chemical properties directly related to particle size, shape, and interparticle distance and surface properties. The unique properties of the gold nanoparticles (AuNPs) are originated from the localized surface plasmon resonance (LSPR) phenomenon, the coupling of light into the resonant oscillation of charge density on the nanostructured noble metal surface. Core@shell type nanospheres have also been utilized as a platform for integration of functionalities into both the core and shell. The interaction between two types of metal NPs selectively located in the core and shell may alter the LSPR property, depending on the relative amount of the two metal components, the relative distance between them and the shell thickness. We suggest a unique strategy to generate core@shell nanoparticles based on pH-sensitive AuNPs decorated with polymer shell. Concretely, pH-sensitive AuNPs having P4VP on the surface were first fabricated through SI-ATRP. Then, they were mixed with selected metal precursor solutions followed by reduction using reducing agent. The metal NPs thus incorporated were distributed uniformly in the P4VP polymer shells. We investigate the structural change during the sequential synthetic process. The bimetallic nanostructures of AuNP@P4VP nanocomposites containing another type of metal NP at the P4VP periphery exhibit a controlled sensing property in terms of the change in the refractive index of surrounding media and a typical electrocatalytic activity for methanol oxidation reaction.
Formation of Various Polymeric Films via Surface-Initiated ARGET ATRP on Silicon Substrates
Kim Su Youn,Seo Hyun Ji,Kim Sunhee,Cho Woo Kyung 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.5
The growth of various polymeric films such as neutral, zwitterionic, and anionic ones was investigated over time from the initiator-immobilized silicon substrates. The polymerization reactions were carried out under ambient conditions via activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) without any predeoxygenating process. Each of the examined polymeric films showed linear/exponential growth over reaction times according to the measurement of ellipsometric film thickness. The successful formation of various polymeric films was further proved by X-ray photoelectron spectroscopy, contact angle goniometry, and measurement of surface free energies. We think that this study can provide a basis for other researches that require to graft polymers with the adjustable film thickness for modulating chemical/physical properties at interfaces.
Hyungwook Kim,Seok-Pyo Hong,Jungkyu K. Lee,이봉수 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.2
We demonstrated the binding capability and non-biofouling efficacy of biotinylated, poly(MAEP-co-OEGMA) films using streptavidin and fibrinogen. The copolymeric films were synthesized on gold substrates without activation or passivation via the surface initiated-controlled radical polymerization of MAEP and OEGMA in five different molar ratios, followed by biotinylation using ?click? chemistry. The copolymeric film synthesized with MAEP at a mole fraction of 0.2 exhibited the best performance of surface plasmon resonance.
Fabrication of Plasmon-Active Polymer-Nanoparticle Composites for Biosensing Applications
Abhinay Mishra,Abdul Rahim Ferhan,Chee Meng Benjamin Ho,Joohyun Lee,Dong-Hwan Kim,Young Jin Kim,Yong-Jin Yoon 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.3
Polymer-nanoparticle composites find relevance in various fields ranging from optoelectronics to the biomedical sciences. Various efforts have been made to devise fabrication strategies that are simple, robust,and reproducible. Herein, we demonstrate a universal strategy to fabricate plasmon-active polymer-nanoparticle composites, exemplified by the incorporation of gold nanoparticles (AuNPs) into a triethylene glycol dimethacrylate (TEGDMA) polymer scaffold. The TEGDMA scaffold was synthesized on a planar glass support substrate via surface-initiated atomic transfer radical polymerization, followed by the immersion of the TEGDMA-coated glass substrate in a solution of AuNPs prepared via conventional wet-chemical synthesis. This led to the strong attachment of AuNPs to the TEGDMA nanolobes, which was confirmed by the UV absorption peak at 527 nm, due to localized surface plasmon resonance of AuNPs. More importantly, the nanolobe architecture facilitates nanoparticle trapping while allowing molecular access to the nanoparticle surface. This enabled us to further functionalize the incorporated AuNPs with thrombin binding aptamer and utilize the biofunctionalized polymer-nanoparticle composite as a thrombin sensor. The synergistic combination of metallic nanoparticles acting as a sensing module with a nonfouling polymer matrix acting both as a nonrigid scaffold and to screen biomolecules allowed the detection of thrombin with good sensitivity down to 0.01 ng/mL with a linear range over three orders of magnitude. Our work paves the way for the fabrication of reliable biomolecular sensors based on the polymer brush-nanoparticle architecture.