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151.
Esen Ercan Alp Tuğrul Hakioğlu Süheyla Özbey Zehra Sayers Ömer Yavaş 《Synchrotron Radiation News》2013,26(2):42-43
Under the glowing southern Turkish sun, a group of 54 students from eight different countries and 18 teachers from all over the world gathered for 10 days to learn about and discuss the latest developments in the applications of X-rays in different branches of science. The International Henry Moseley School and Workshop on X-ray Science was held at the Institute of Theoretical and Applied Physics in Turunç, Turkey, from June 14 to 23, 2012. 相似文献
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153.
Aydan Dag Hatice Sahin Hakan Durmaz Gurkan Hizal Umit Tunca 《Journal of polymer science. Part A, Polymer chemistry》2011,49(4):886-892
We report an efficient way, sequential double click reactions, for the preparation of brush copolymers with AB block‐brush architectures containing polyoxanorbornene (poly (ONB)) backbone and poly(ε‐caprolactone) (PCL), poly(methyl methacrylate) (PMMA) or poly(tert‐butyl acrylate) (PtBA) side chains: poly(ONB‐g‐PMMA)‐b‐poly(ONB‐g‐PCL) and poly(ONB‐g‐PtBA)‐b‐poly(ONB‐g‐PCL). The living ROMP of ONB affords the synthesis of well‐defined poly(ONB‐anthracene)20‐b‐poly (ONB‐azide)5 block copolymer with anthryl and azide pendant groups. Subsequently, well‐defined linear alkyne end‐functionalized PCL (PCL‐alkyne), maleimide end‐functionalized PMMA (PMMA‐MI) and PtBA‐MI were introduced onto the block copolymer via sequential azide‐alkyne and Diels‐Alder click reactions, thus yielding block‐brush copolymers. The molecular weight of block‐brush copolymers was measured via triple detection GPC (TD‐GPC) introducing the experimentally calculated dn/dc values to the software. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 相似文献
154.
Elif Baysak Ozgun Daglar Ufuk Saim Gunay Gurkan Hizal Umit Tunca Hakan Durmaz 《Journal of polymer science. Part A, Polymer chemistry》2018,56(19):2145-2153
Two different oxanorbornene monomers were prepared and copolymerized with butyl-functionalized oxanorbornene monomer through the ring-opening metathesis polymerization. The resulting polymers were then subjected to the aminolysis reactions with propylamine (PA) in the presence of methyl acrylate (MA) to capture, in situ, the latent thiol. It was found that the polymer, in which the thiolactone unit is close to the polymer backbone, did not undergo an efficient aminolysis reaction even an excess amount of PA was utilized, while the other polymer, in which the thiolactone unit away from the polymer backbone, did efficiently undergo aminolysis reaction even PA was used in low amounts. Besides, a variety of primary amine compounds along with MA were reacted with the polymer, in which the thiolactone group away from the polymer backbone, to test their reactivity toward the aminolysis reactions. All modified polymers were characterized by using conventional instruments such as gel permeation chromatography, nuclear magnetic resonance, and differential scanning calorimetry. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56, 2145–2153 相似文献
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156.
Jalil Manafian Onur Alp Ilhan Ladan Avazpour As'ad Alizadeh 《Mathematical Methods in the Applied Sciences》2020,43(17):9904-9927
The present article deals with M-soliton solution and N-soliton solution of the (2 + 1)-dimensional asymmetrical Nizhnik–Novikov–Veselov equation by virtue of Hirota bilinear operator method. The obtained solutions for solving the current equation represent some localized waves including soliton, breather, lump, and their interactions, which have been investigated by the approach of the long-wave limit. Mainly, by choosing the specific parameter constraints in the M-soliton and N-soliton solutions, all cases of the one breather or one lump can be captured from the two, three, four, and five solitons. In addition, the performances of the mentioned technique, namely, the Hirota bilinear technique, are substantially powerful and absolutely reliable to search for new explicit solutions of nonlinear models. Meanwhile, the obtained solutions are extended with numerical simulation to analyze graphically, which results in localized waves and their interaction from the two-, three-, four-, and five-soliton solutions profiles. They will be extensively used to report many attractive physical phenomena in the fields of acoustics, heat transfer, fluid dynamics, classical mechanics, and so on. 相似文献
157.
Postfunctionalization of polyoxanorbornene backbone through the combination of bromination and nitroxide radical coupling reactions 下载免费PDF全文
Lale Nur Atici Erhan Demirel Umit Tunca Gurkan Hizal Hakan Durmaz 《Journal of polymer science. Part A, Polymer chemistry》2015,53(20):2381-2389
The brominated backbone of poly(oxanorbornene imide) (PONB) (PONB‐Br) was functionalized with 2,2,6,6‐tetramethylpiperidine 1‐oxyl (TEMPO)‐acrylate, ‐epoxy, and poly (ethylene glycol) (PEG) yielding PONB‐acrylate, PONB‐epoxy, and PONB‐PEG through the nitroxide radical coupling (NRC) reaction. Although an excess amount of functional‐TEMPOs were used. The observed NRC efficiencies were found in the range of 7–25%. Notably, 1H NMR spectra of all polymers exhibited a signal at 6.08 ppm after NRC reactions indicating rebuilding of the main chain double bond and further identified by 13C NMR analysis. The inevitable formation of double bond through the tendency of the recombination of the formed radicals was supported by a separate experiment conducted without utilizing functional‐TEMPO. Besides, the versatility of the ROMP backbone further demonstrated by the introduction hetero functionality onto the polymer by a consecutive reactions. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 2381–2389 相似文献
158.
Dr. Devrani Mitra Dr. Hideaki Ogata Prof. Wolfgang Lubitz Brian C. Manor Prof. Thomas B. Rauchfuss Dr. Deborah Byrne Dr. Violaine Bonnefoy Prof. Francis E. Jenney Jr. Prof. Michael W. W. Adams Dr. Yoshitaka Yoda Dr. Ercan Alp Dr. Jiyong Zhao Prof. Stephen P. Cramer 《Angewandte Chemie (International ed. in English)》2013,52(2):724-728
159.
Lena Scherthan Rouven F. Pfleger Hendrik Auerbach Tim Hochdrffer Juliusz A. Wolny Wenli Bi Jiyong Zhao Michael Y. Hu E. Ercan Alp Christopher E. Anson Rolf Diller Annie K. Powell Volker Schünemann 《Angewandte Chemie (International ed. in English)》2020,59(23):8818-8822
Synchrotron‐based nuclear resonance vibrational spectroscopy (NRVS) using the Mössbauer isotope 161Dy has been employed for the first time to study the vibrational properties of a single‐molecule magnet (SMM) incorporating DyIII, namely [Dy(Cy3PO)2(H2O)5]Br3?2 (Cy3PO)?2 H2O ?2 EtOH. The experimental partial phonon density of states (pDOS), which includes all vibrational modes involving a displacement of the DyIII ion, was reproduced by means of simulations using density functional theory (DFT), enabling the assignment of all intramolecular vibrational modes. This study proves that 161Dy NRVS is a powerful experimental tool with significant potential to help to clarify the role of phonons in SMMs. 相似文献
160.
Sebastian Kunze Philipp Grosse Dr. Miguel Bernal Lopez Dr. Ilya Sinev Dr. Ioannis Zegkinoglou Dr. Hemma Mistry Dr. Janis Timoshenko Michael Y. Hu Jiyong Zhao Ercan E. Alp Dr. See Wee Chee Prof. Beatriz Roldan Cuenya 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(50):22856-22863
Operando nuclear resonant inelastic X-ray scattering (NRIXS) and X-ray absorption fine-structure spectroscopy (XAFS) measurements were used to gain insight into the structure and surface composition of FeCu and FeAg nanoparticles (NPs) during the electrochemical CO2 reduction (CO2RR) and to extract correlations with their catalytic activity and selectivity. The formation of a core–shell structure during CO2RR for FeAg NPs was inferred from the analysis of the operando NRIXS data (phonon density of states, PDOS) and XAFS measurements. Electrochemical analysis of the FeAg NPs revealed a faradaic selectivity of 36 % for CO in 0.1 M KHCO3 at −1.1 V vs. RHE, similar to that of pure Ag NPs. In contrast, a predominant selectivity towards H2 evolution is obtained in the case of the FeCu NPs, analogous to the results obtained for pure Fe NPs, although small Cu NPs have also been shown to favor H2 production. 相似文献