Article
Thermodynamics
Malgorzata Latos-Brozio, Anna Masek, Malgorzata Piotrowska
Summary: This study investigates the effect of enzymatic polymerization on the thermal stability of oligomeric flavonoids. Oligomeric quercetin, rutin, and catechin were prepared and characterized by various spectroscopic and chromatographic methods. The results show that oligomeric flavonoids exhibit higher oxidation temperature and better thermal stability, as well as antioxidant and antimicrobial properties.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Polymer Science
Ismet Kaya, HaticeKaraer Yagmur
Summary: Aromatic compounds with hydroxyl and amine groups can be enzymatically or oxidatively polymerized to form oligomers or polymers, known as green chemistry. Poly(4-aminosalicylic acid) obtained through oxidative polymerization showed higher residual amount at 1000 degrees Celsius compared to ASA and PASA-E, indicating potential applications.
IRANIAN POLYMER JOURNAL
(2022)
Article
Chemistry, Physical
Yonghe Zhang, Min Xie, Zhigang Wang, Xiwen Song, Rende Mu, Jianquan Gao, Jinxiao Bao, Fen Zhou, Wei Pan
Summary: This study evaluated the contribution of phonon, photon, and electronic heat conduction to the thermal conductivity of high-entropy systems. The (La0.2Gd0.2Y0.2Yb0.2Er0.2)2(Zr1-xCex)2O7 (x = 0-0.5) high-entropy ceramics with a single defective fluorite structure were successfully prepared. The thermal conductivities of these ceramics showed an unusual behavior, which can be attributed to the increased electronic and photon thermal conductivities and reduced phonon-grain boundary scattering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
V Tkac, R. Tarasenko, E. Cizmar, A. Orendacova, K. Tibenska, J. Holubova, E. Cernoskova, Z. Cernosek, M. Orendac
Summary: The investigation of 3Zn(PO3)(2)center dot 2Mn(PO3)(2) phosphate glass revealed that it does not form a spin glass state at low temperatures, while the magnetic subsystem can be approximated by S = 5/2 antiferromagnetic dimers. Furthermore, a temperature-independent process was observed at low temperatures, attributed to cross-tunneling relaxation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Sahel Karoui, Hassen Chouaib, Slaheddine Kamoun
Summary: A new organic manganese pseudo halide material was synthesized, with a complex crystal structure involving various interactions between organic cations and manganese ions. Optical properties of the material were studied using UV-Vis spectroscopy, and electronic structure parameters were calculated using density functional theory.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Review
Biochemistry & Molecular Biology
Sudha Sharma, Papori Sharma, Tara Bailey, Susmita Bhattarai, Utsab Subedi, Chloe Miller, Hosne Ara, Srivatsan Kidambi, Hong Sun, Manikandan Panchatcharam, Sumitra Miriyala
Summary: Reactive oxygen species (ROS) are highly reactive molecules generated as a by-product of aerobic life, which can lead to oxidative stress and the formation of bioactive compounds like 4-hydroxynonenal (4-HNE). 4-HNE forms covalent adducts with proteins, nucleic acids, and lipids, affecting mitochondrial functions and promoting apoptosis.
Article
Materials Science, Composites
Zilong Jiang, Xin Liu, Qinfei Xu, Chenyi Zhou, Yingshuang Shang, Haibo Zhang
Summary: By constructing a thermal conductive network with graphite nanosheet (GNS) and multi-walled carbon nanotube (MWCNT) in poly (ether ether ketone) (PEEK), the thermal conductivity of the material was significantly improved. Methods such as in-situ polymerization and ball milling effectively enhanced the connection of fillers and the construction of thermal conduction path, while maintaining good mechanical strength. This material shows potential for future applications in thermal conductive structural components.
COMPOSITES COMMUNICATIONS
(2022)
Article
Physics, Applied
Zeyu Xiang, Puqing Jiang, Ronggui Yang
Summary: TDTR is a technique used to measure thermal conductivity of materials and interface, but the commonly used data analysis method often underestimates the thermal conductivity of high thermal conductivity materials. In this study, a theoretical model based on phonon hydrodynamics is developed for more accurate TDTR data analysis, and the effectiveness of the model is confirmed through experiments.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Composites
Mengmeng Yan, Xiaogang Chen, Yangyang Xu, Yu Pan, Jinlei Li, Junli Li, Ting Wu, Huanli Zheng, Xiaoxiao Chen, Jianxin He
Summary: Thermal management materials with high thermal conductivities, heat resistances, and excellent mechanical properties are needed for modern electronic power systems. This study synthesized para-aramid nanofibers using a greener method and combined them with water-dispersible reduced graphene oxide to create a highly thermally conductive composite membrane. The composite membrane showed high thermal conductivity and tensile strength, making it suitable for high-temperature applications. Additionally, it demonstrated excellent thermal management performance in reducing surface temperature of LED lamps.
COMPOSITES COMMUNICATIONS
(2023)
Article
Polymer Science
Alain Salvador Conejo-Davila, Marco Armando Moya-Quevedo, David Chavez-Flores, Alejandro Vega-Rios, Erasto Armando Zaragoza-Contreras
Summary: The development of Ani-AMPS monomer, which contains two polymerizable functional groups, was systematically studied in this research. The selective polymerization of Ani-AMPS led to the formation of Poly(Ani-AMPS) and PAni-AMPS, which exhibit different properties under various conditions. Optical and thermal properties of the two polymers were analyzed, showing significant changes in different pH conditions.
Article
Polymer Science
Tugba Celiker, Sinem Altinisik, Aliaksei Vaitusionak, Sergei V. Kostjuk, Sermet Koyuncu, Yusuf Yagci
Summary: This study investigates the photoinduced radical and step-growth polymerizations of carbazole functional styrene using sequential and one-pot strategies. The obtained polymers were characterized using various analytical techniques. The results from theoretical calculations and experimental measurements are well-matched. In the sequential approach, visible light-induced free-radical photopolymerization followed by step-growth polymerization results in linear polymers with side-chain carbazole moieties. In the one-pot approach, simultaneous free-radical and step-growth polymerizations yield cross-linked polymers with dispersed distribution.
Article
Materials Science, Multidisciplinary
Shibna Balakrishnan, Ranjana Venugopal, Aswathi Harikumar, Biswapriya Deb, Joshy Joseph
Summary: Triphenylamine derivatives, C-Sty2 and C-Sty3, are promising organic electrochromic materials with easy synthesis, low oxidation potentials, high charge-carrier mobilities, electrochemical stability, coloration efficiency, and tunability of EC properties. The hyper-cross-linked derivative C-Sty3 demonstrates enhanced coloration efficiency, optical contrast, and open-circuit memory compared to C-Sty2, highlighting the significance of highly branched conducting polymers in EC applications.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
T. Itou, R. Kato
Summary: Recent studies have found that the organic system K-(BEDT-TTF)2Cu2(CN)3, previously regarded as a quantum spin liquid candidate, is actually a valence bond solid. To verify this interpretation and discuss its applicability to other potential spin liquid candidates, a comprehensive nuclear magnetic resonance (NMR) report is needed for comparative analysis.
Article
Chemistry, Multidisciplinary
Zixian Jia, Luc Museur, Mamadou Traore, Christian Perruchot, Jan Brajer, Marek Bohm, Andrei Kanaev
Summary: The ability to initiate chemical reactions without the need for potentially hazardous solvents, catalysts, and radical initiators is crucial in modern biotechnologies and medicine. In this study, laser-driven shock wave compression was used to trigger the polymerization process of pure 2-hydroxyethylmethacrylate (HEMA) without any additives. The results showed that the generated shock wave pressure allowed the initiation of radical polymerization and the formation of poly-HEMA oligomers.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Polymer Science
Hakan Soyut, Feyza Kolcu, Ismet Kaya, Alper Omer Yasar
Summary: Semi-conductive polymers have been widely used in various applications such as coatings, accumulators, solar cells, rechargeable batteries, ion sensors, photoreceptors, light-emitting diodes and electrochromic instruments. Two types of polymers, Poly(TFMBDA)-O and Poly(TFMBDA)-E, were synthesized using different polymerization methods. The structures of the compounds were confirmed using FT-IR, UV-vis and H-1-NMR and C-13-NMR instruments. The polymers showed different properties in terms of molecular weight, glass temperature, and photoluminescence emission.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Polymer Science
Adnan Solmaz, Zulfiye Ilter, Ismet Kaya
Summary: In this study, a series of chalcone methacrylamide polymers were synthesized and characterized comprehensively for their structural and performance properties, including thermal behavior, electrical properties, and antimicrobial activities. The results demonstrated the potential applications of these polymers in various fields due to their unique properties.
Article
Polymer Science
Ismet Kaya, HaticeKaraer Yagmur
Summary: Aromatic compounds with hydroxyl and amine groups can be enzymatically or oxidatively polymerized to form oligomers or polymers, known as green chemistry. Poly(4-aminosalicylic acid) obtained through oxidative polymerization showed higher residual amount at 1000 degrees Celsius compared to ASA and PASA-E, indicating potential applications.
IRANIAN POLYMER JOURNAL
(2022)
Article
Chemistry, Applied
Elif Karacan Yeldir, Digdem Erdener, Ismet Kaya
Summary: In this study, a unique Schiff base and its oligomer were synthesized and characterized. The Schiff base showed high thermal stability and exhibited potential as a Cr3+ sensor. The results provide valuable insights into the structural, electrochemical, optical, and thermal properties of the synthesized compounds.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Polymer Science
Elif Karacan Yeldir, Ismet Kaya
Summary: A monomer and an oligomer containing a pyrene group were synthesized and characterized. The monomer showed sensitivity to Sn2+ ions and could be potentially used as a fluorescence sensor. The synthesized oligomer also exhibited fluorescent properties.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Ismet Kaya, Kevser Temizkan, Yeliz Kaya, Ayse Ercag
Summary: In this study, a family of azomethine-based thiocarbohydrazone monomers and polymers were synthesized and characterized using various techniques. The compounds exhibited different fluorescence and antioxidant activities, as determined through analyses of their electrochemical behaviors, fluorescent activities, thermal characteristics, and antioxidant effectiveness.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Feyza Kolcu, Ismet Kaya
Summary: A carbazole-based Schiff base chemosensor was synthesized for fluorescent sensing of Al3+ ions. The ligand exhibited fluorescence enhancement upon chelation with Al3+ ions, making it a potential probe for detecting Al3+ ions. The specificity of the ligand for Al3+ ions and its reversible complex formation with EDTA were also studied. The synthesized Schiff base showed efficient detection of Al3+ ions as a fluorescent sensor.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Polymer Science
Ismet Kaya, Semra Koca, Hatice Karaer Yagmur
Summary: Schiff bases and their conjugated oligo(azomethine)s were synthesized via condensation and oxidative polycondensation. The structures of polymers were confirmed and their electrochemical and thermal properties were studied. The electrical properties of monomers and oligomers were determined.
JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
(2022)
Article
Chemistry, Physical
Ismet Kaya, Semra Koca, Hatice Karaer Yagmur
Summary: Two Schiff bases, SB1 and SB2, were synthesized through a condensation reaction. The oxidative polycondenzation reaction conditions were determined for SB1 and SB2 using H2O2, NaOCl, and air oxidants at different temperatures and reaction times. The structural, electrochemical, and thermal properties of the compounds were characterized. It was found that SB2 exhibited better thermal stability, optical properties, and conductivity compared to SB1.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Polymer Science
Hakan Soyut, Feyza Kolcu, Ismet Kaya, Alper Omer Yasar
Summary: Semi-conductive polymers have been widely used in various applications such as coatings, accumulators, solar cells, rechargeable batteries, ion sensors, photoreceptors, light-emitting diodes and electrochromic instruments. Two types of polymers, Poly(TFMBDA)-O and Poly(TFMBDA)-E, were synthesized using different polymerization methods. The structures of the compounds were confirmed using FT-IR, UV-vis and H-1-NMR and C-13-NMR instruments. The polymers showed different properties in terms of molecular weight, glass temperature, and photoluminescence emission.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Polymer Science
Musa Kamaci, Ismet Kaya
Summary: In this study, biodegradable hybrid hydrogels were prepared for the drug delivery application of 5-fluorouracil. The results showed that the fabricated hydrogels exhibited good mechanical, hydrophilic, water uptake, and biodegradation behaviors, making them a promising candidate for the controlled delivery of 5-FU.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Polymer Science
Ismet Kaya, Burcin Akyuz, Sahin Ozel
Summary: The 8-((4-hydroxybenzylidene)amino)naphthalene-2-ol (ANAPSB) compound was synthesized through the condensation reaction of 8-amino-2-naphthol (ANAP) with 4-hydroxybenzaldehyde, and then polymerized with 8-amino-2-naphthol via oxidative polycondensation in an alkaline medium using H2O2 as an oxidant. The structures of the compounds were confirmed through various measurements, and their properties were analyzed. The results showed that PANAP and PANAPSB exhibited different thermal and optical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Feyza Kolcu, Sueleyman Culhaoglu, Ismet Kaya
Summary: A one-pot condensation reaction between 9,9-Bis(4-aminophenyl)fluorene and 9-Ethyl-9H-carbazole-3-carbalde-hyde resulted in the synthesis of a chemosensor, SB, which exhibited high sensitivity and selectivity towards Sn2+ ions. The chelation-enhanced fluorescence (CHEF) mechanism was responsible for the turn-on fluorescent recognition process of Sn2+ by restricting C=N isomerization and inhibiting intramolecular charge transfer (ICT). The synthesized SB-Sn2+ chelation showed a limit of detection value of 3.37 nM and demonstrated reversibility in the presence of chelating agent EDTA.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Polymer Science
Ismet Kaya, Ruhsar Ela Iris, Hatice Karaer Yagmur
Summary: In this study, a Schiff base, 2,4,6-tris(4-hydroxybenzimino)-1,3,5-triazine (HT), and its derivatives were synthesized and used as building blocks to prepare flame-resistant polymers. The resulting melamine and pentaerythritol-based polymers exhibited excellent flame retardancy.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Polymer Science
Alper Omer Yasar, Ismet Kaya
Summary: Chitosan/polypyrrole (Ks/PPy) nanoparticles were synthesized and embedded in a poly(acrylamide) (PAAm) hydrogel matrix. The PAAm-Ks/PPy hydrogels were treated with hydrochloric acid (HCl), resulting in an increase in electrical conductivity and adsorption performance.
Article
Polymer Science
Ismet Kaya, Emin Dincer, Hatice Karaer Yagmur
Summary: Schiff bases and poly(phenoxy-imine)s were synthesized and characterized in this study. P-SCH-2-A showed excellent performance in terms of LOI and optical band gap. The glass transition temperature and surface properties of the poly(phenoxy-imine)s were also determined.
