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SiC Substrate Effects on Electron Transport in the Epitaxial Graphene Layer
Engin Arslan,Semih Çakmakyapan,Özgür Kazar,Serkan Bütün,Sefer Bora Li esivdin,Neval A. Cinel,Gülay Ertas,Sükrü Ardal,Engin T ras,Jawad-ul-Hassan,E. Janzén,Ekmel Özbay 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
Hall effect measurements on epitaxial graphene (EG) on SiC substrate have been carried out as a function of temperature. The mobility and concentration of electrons within the two-dimensional electron gas (2DEG) at the EG layers and within the underlying SiC substrate are readily separated and characterized by the simple parallel conduction extraction method (SPCEM). Two electron carriers are identified in the EG/SiC sample: one highmobility carrier (3493 cm2/Vs at 300 K) and one low-mobility carrier (1115 cm2/Vs at 300 K). The high mobility carrier can be assigned to the graphene layers. The second carrier has been assigned to the SiC substrate.
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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.
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Yasemin Samav,Bernice Akpinar,Gökhan Kocak,Vural Bütün 한국고분자학회 2020 Macromolecular Research Vol.28 No.12
In this study, novel zwitterionic diblock copolymers, namely poly(2-(Nmorpholino) ethyl methacrylate))-block-poly(2-(methacryloyloxy)ethyl phosphate) (PMEMA-b-PMOEP) and poly(2-(N-morpholino)ethyl methacrylate))-block-poly ((methacryloyloxy)methyl phosphonic acid) (PMEMA-b-PMOMP), were synthesized via reversible addition-fragmentation chain transfer controlled radical polymerization. Solution properties of these phosphorus-based diblock copolymers were investigated using dynamic light scattering, transmission electron microscopy and proton nuclear magnetic resonance spectroscopy. Since the PMEMA block has both saltand thermo-responsive properties, PMEMA-b-PMOEP and PMEMA-b-PMOMP diblock copolymers formed core-shell micelles in basic aqueous media as the PMEMA block formed insoluble micelle core with the addition of Na2SO4 or an increase in temperature in basic solution. Additionally, PMEMA-b-PMOMP diblock copolymers interacted strongly with calcium cations and yielded reverse micellar structures via complexation of phosphate with metal cation in aqueous media.
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