WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7150
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Article Tuning Pore Chemistry in Dioxin-Linked Porous Organic Polymers for Enhanced High-Pressure CO2 Uptake(John Wiley and Sons Inc, 2025) Büyükçakır, Onur; Piech, K.; Büyükcakir, O.; Yildirim, T.; Coskun, A.; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of TechnologyPrecise tuning of pore chemistry in three-dimensional porous organic polymers (3D-POPs) is critical for high-performance gas (CO<inf>2</inf>)-separation. Here, we demonstrate the impact of functional groups on the dioxin-linked 3D-tPOPs bearing a tetraphenylene core, synthesized under solvothermal conditions using NaCl as a template, on the low- and high-pressure CO<inf>2</inf> uptake. The post-synthetic amidoxime functionalization of 3D-tPOPs, involving the reaction of pendant nitrile moieties with hydroxylamine hydrochloride, has been shown to precisely tailor pore chemistry without altering the network structure. Whereas the incorporation of the amidoxime moieties, 3D-tPOP-AO, enables higher heteroatom content, a critical factor to enhance CO<inf>2</inf> affinity at low pressures, strong hydrogen bonding interactions between amidoxime units limit framework flexibility, thus leading to a significant decrease in the high-pressure gas uptake. 3D-tPOPs on the other hand showed a high CO<inf>2</inf> uptake capacity of 57.4 wt% at 33 bar and 270 K; after modification, CO<inf>2</inf> uptake capacity decreased to 19.4 wt% at 273 K and 34 bar. Similarly, CH<inf>4</inf> uptake capacity also decreased from 14.0 wt% at 116 bar and 270 K to 3.8 wt% at 75 bar and 273 K. These findings highlight the critical role of the interactions between functional groups and pore chemistry to form robust adsorbents with high CO<inf>2</inf> uptake performance at high pressures. © 2025 The Author(s). Helvetica Chimica Acta published by Wiley-VHCA AG.Article Citation - WoS: 1Citation - Scopus: 1Gate-Controlled Photoresponse in an Individual Single-Walled Carbon Nanotube Modified With a Fluorescent Protein(John Wiley and Sons Inc, 2025) Kudriavtseva, A.S.; Nekrasov, N.P.; Krasnikov, D.V.; Nasibulin, A.G.; Bogdanov, A.M.; Bobrinetskiy, I.; 01. Izmir Institute of TechnologyBionanohybrids of carbon nanotubes and fluorescent proteins (FPs) are a promising class of materials for optoelectronic applications. Understanding and controlling the charge transport mechanism between FPs and carbon nanotubes are critical to achieving functional reproducibility and exploring novel synergetic effects. This work demonstrates a novel phenomenon of photocurrent generation in field-effect transistors based on the conjugation of an individual single-walled carbon nanotube (SWCNT) and FPs. When studying the effect of gate voltage on the photoresponse, reversible switching from fast positive to a slow negative photoresponse in bionanohybrids associated with depletion and accumulation modes, respectively is observed. The latter demonstrates a stable memory effect after the light is turned off. It is revealed that in depletion mode, the charge carriers from the protein are not trapped at the interface due to effective screening by the gate potential. It is suggested that the main mechanism in photoresponse switching is a competitive effect between photogating and effective photodoping of the SWCNT by charges trapped at the nanotube interface. The noticeable effect of water molecules can support proton transfer as the main mechanism of charge transfer. This result illustrates that SWCNT/FP bionanohybrids bear great potential for the realization of novel optoelectronic devices. © 2024 The Author(s). Advanced Electronic Materials published by Wiley-VCH GmbH.Article Citation - WoS: 5Citation - Scopus: 8Textural, Rheological, Melting Properties, Particle Size Distribution, and Nmr Relaxometry of Cocoa Hazelnut Spread With Inulin-Stevia Addition as Sugar Replacer(John Wiley and Sons Inc, 2024) Berk, Berkay; Cosar,S.; Mazı,B.G.; Oztop,M.H.; 01. Izmir Institute of Technology; 03.08. Department of Food Engineering; 03. Faculty of EngineeringThis study investigated the influence of substituting 60, 80, and 100% of the sugar in traditional cocoa hazelnut paste (control) formulation with inulin-stevia (90:10, w/w) mixture on textural and rheological characteristics, melting behavior, water activity (aw), particle size distribution (PSD), and color. Textural, rheological, melting properties, and color of samples were analyzed after 1, 2, and 3 months of storage at 11°C. Nuclear magnetic resonance (NMR) relaxometry experiments were also performed to understand the interaction of new ingredients with oil. Replacement of sugar with inulin-stevia gave darker color, reduced Casson yield stress, and changed the textural parameters and melting profile of the samples depending on the level but did not create a remarkable effect on PSD and Casson plastic viscosity. Increasing inulin-stevia content yielded lower aw and higher T2a values indicating decreased mobility of water. Complete removal of sugar caused low spreadability. The results showed that an 80% replacement level yielded a product with similar textural parameters and fat-melting mouth feeling compared to control sample. Cocoa hazelnut spreads prepared with inulin and stevia showed good textural stability during storage. © 2024 The Authors. Journal of Texture Studies published by Wiley Periodicals LLC.Review Citation - WoS: 19Citation - Scopus: 22Cancer Stem Cells in Tumor Modeling: Challenges and Future Directions(John Wiley and Sons Inc, 2021) Pesen Okvur, Devrim; Kisim,A.; Bati-Ayaz,G.; Kubicek,G.J.; Pesen-Okvur,D.; Miri,A.K.; 01. Izmir Institute of Technology; 04.03. Department of Molecular Biology and Genetics; 04. Faculty of ScienceMicrofluidic tumors-on-chips models have revolutionized anticancer therapeutic research by creating an ideal microenvironment for cancer cells. The tumor microenvironment (TME) includes various cell types and cancer stem cells (CSCs), which are postulated to regulate the growth, invasion, and migratory behavior of tumor cells. In this review, the biological niches of the TME and cancer cell behavior focusing on the behavior of CSCs are summarized. Conventional cancer models such as 3D cultures and organoid models are reviewed. Opportunities for the incorporation of CSCs with tumors-on-chips are then discussed for creating tumor invasion models. Such models will represent a paradigm shift in the cancer community by allowing oncologists and clinicians to predict better which cancer patients will benefit from chemotherapy treatments. © 2021 The Authors. Advanced NanoBiomed Research published by Wiley-VCH GmbH.Review Citation - WoS: 44Citation - Scopus: 48Review on Polymeric, Inorganic, and Composite Materials for Air Filters: From Processing To Properties(John Wiley and Sons Inc, 2021) Ahmetoğlu, Çekdar Vakıf; Abdullayev,A.; Vakifahmetoglu,C.; Simon,U.; Bensalah,H.; Gurlo,A.; Bekheet,M.F.; 01. Izmir Institute of Technology; 03.09. Department of Materials Science and Engineering; 03. Faculty of EngineeringParticulate and gaseous air pollutants pose a threat to human health and contribute to climate change. By today, air filters, stationary and portable, are markedly improved and can often provide innocuous air pollution levels. After introducing the classification and standards on air filters, the influence of the processing route and its parameters on the resulting air filter properties and consequently its performance are discussed. Numerous tools are presented to adjust structural properties such as fiber or pore diameter, specific surface area, surface charge, hydrophilicity, or photocatalytic activity to achieve the desired performance in terms of high filtration efficiencies, sufficient mechanical stability, regeneration eligibility, antimicrobial and optical properties. In particular, inorganic and composite materials as well as nonfibrous structures are covered, which are currently holding an outsider position in an air filter community dominated by polymeric materials and fibrous structures. © 2021 The Authors. Advanced Energy and Sustainability Research published by Wiley-VCH GmbH.