WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

Permanent URI for this collectionhttps://hdl.handle.net/20.500.13091/2

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Now showing 1 - 16 of 16

Citation - WoS: 2
Citation - Scopus: 2
Calixarene-Based Functional Fabric for Simultaneously Adsorptive Removal of Anionic and Cationic Dyes
(Amer Chemical Soc, 2025) Ozcelik, Egemen; Tabakci, Begum; Karaman, Mustafa; Tabakci, Mustafa
This study investigated the adsorptive properties of functionalized fabric containing dimethylaminomethyl calix[4]arene (DMAM-Calix) to remove anionic methyl orange (MO) and cationic Rhodamine B (RhB) dyes in aqueous media. Adsorption studies were performed using a filtration system packed with DMAM-Calix-functionalized fabric (DCF). The results revealed that the cationic and anionic structures work compatibly in a binary mixture medium. Hydrogen bonding, pi-pi, cation-pi, n-pi and electrostatic interactions between dye molecules and DMAM-Calix units of DCF were the main factors affecting the adsorption process. Experiments on real wastewater samples of unknown composition confirmed that the approach could successfully remove MO and RhB dyes from real water samples with high efficiency, especially for RhB. Isotherm and kinetic data for MO were mainly represented by the Langmuir model and pseudo-second-order kinetic model, respectively. The adsorption capacities of DCF were found to be about 4.7 mg g-1 for MO and 1.0 mg g-1 for RhB at pH 6.0, which were evaluated as satisfactory considering the first use of a calixarene-derived coated fabric as an adsorbent, the anionic-cationic dye selectivity of DCF, and the low cost and ease of application of the method.
Citation - WoS: 12
Citation - Scopus: 16
Characterization of Polysaccharide Extracts of Four Edible Mushrooms and Determination of in Vitro Antioxidant, Enzyme Inhibition and Anticancer Activities
(Amer Chemical Soc, 2024) Deveci, Ebru; Tel-Cayan, Gülsen; Cayan, Fatih; Altinok, Bahar Yilmaz; Aktaş, Sinan
Mushroom polysaccharides are important bioactive compounds derived from mushrooms with various beneficial properties. In this study, the chemical characterization and bioactivities of polysaccharide extracts from four different edible mushrooms, Clavariadelphus truncatus Donk, Craterellus tubaeformis (Fr.) Quel., Hygrophorus pudorinus (Fr.) Fr., and Macrolepiota procera (Scop.) Singer were studied. Glucose (13.24-56.02%), galactose (14.18-64.05%), mannose (2.18-18.13%), fucose (1.21-5.78%), and arabinose (0.04-5.43%) were identified in all polysaccharide extracts by GC-MS (gas chromatography-mass spectrometry). FT-IR (Fourier transform infrared spectroscopy) confirmed the presence of characteristic carbohydrate patterns. H-1 NMR suggested that all polysaccharide extracts had alpha- and beta-d-mannopyranose, d-glucopyranose, d-galactopyranose, alpha-l-arabinofuranose, and alpha-l-fucopyranose residues. Approximate molecular weights of polysaccharide extracts were determined by HPLC (high-performance liquid chromatography). The best antioxidant activity was found in M. procera polysaccharide extract in DPPH center dot (1,1-diphenyl-2-picrylhydrazyl) scavenging (39.03% at 800 mu g/mL), CUPRAC (cupric reducing antioxidant capacity) (A(0.50): 387.50 mu g/mL), and PRAP (phosphomolybdenum reducing antioxidant power) (A(0.50): 384.08 mu g/mL) assays. C. truncatus polysaccharide extract showed the highest antioxidant activity in ABTS(center dot+) scavenging (IC50: 734.09 mu g/mL), beta-carotene-linoleic acid (IC50: 472.16 mu g/mL), and iron chelating (IC50: 180.35 mu g/mL) assays. Significant anticancer activity was found in C. truncatus polysaccharide extract on HT-29 (IC50: 46.49 mu g/mL) and HepG2 (IC50: 48.50 mu g/mL) cell lines and H. pudorinus polysaccharide extract on the HeLa cell line (IC50: 51.64 mu g/mL). Also, H. pudorinus polysaccharide extract possessed prominent AChE (acetylcholinesterase) inhibition activity (49.14% at 200 mu g/mL).
Comprehensive Evaluation of Pm (Deposition/Tsp) Pollution From Multiple Quarrying Activities
(Amer Chemical Soc, 2025) Kara, Gulnihal; Cankaya, Ali
This study, for the first time, analyzed organic matter (OM)-ash fractions, inorganic/organic species, chemical structures, and inhibition effects (EI) in the same sample using a novel procedure. This allowed for an evaluation of the actual contributions of these species to particulate matter (PM) and environmental impacts. Results showed that the mobilities of Al, Co, and potentially toxic elements (PTEs) (As, Cd, Cr, Cu, Pb, and Ni) varied between organic and inorganic phases depending on pH and organic groups. The transition of these elements into the organic phase, along with Ca, contributed to silica polymerization, increased EI in the organic eluate, and enhanced bioavailability in the presence of low water-soluble OM (WOM). Therefore, although Ca abundance reduced EI in the organic eluate, the organic eluate of multiple quarrying areas (MQA), with the lowest OM, exhibited an EI equivalent to the background area (BA). Although Sigma PTEs in total suspended particulates (TSP) inorganic eluates decreased compared to total deposition (TD), EI increased. Due to TD-facilitated accumulation-transition and metabolite formation, leading to higher EI in organic eluates. This finding aligned with similar effects observed in aged atmospheric aerosols from the same region. MQA activities significantly contributed to inert dust pollution, Ca, Cu, Cr, 40K, and Na accumulation, silica and alkali oxide abundance, SOA precursor (e.g., phthalic acid) transformation into more hazardous phthalate esters (PAEs), and new metabolite formation affecting climate change. These activities increased yearly TD and estimated mean TSP by 42 and 41 times, respectively, to 52.9 g/m2-year and 1.3 mg/m3 compared to BA. Despite MQA having the highest TSP-TD, semirural (SRRA) PM influenced by MQA exhibited the highest chemical composition and acute EI. Furthermore, it was found that, aside from Na and Se, there were no significantly enriched elements in MQA when compared to BA.
Citation - WoS: 18
Citation - Scopus: 19
Development of Highly Luminescent Water-Insoluble Carbon Dots by Using Calix[4]pyrrole as the Carbon Precursor and Their Potential Application in Organic Solar Cells
(Amer Chemical Soc, 2022) Coşkun, Yağız; Ünlü, Fatma Yelda; Yılmaz, Tuğbahan; Türker, Yurdanur; Aydoğan, Abdullah; Kuş, Mahmut; Ünlü, Caner
Carbon dots (CDs) are carbon-based fluorescent nanomaterials that are of interest in different research areas due to their low cost production and low toxicity. Considering their unique photophysical properties, hydrophobic/amphiphilic CDs are powerful alternatives to metal-based quantum dots in LED and photovoltaic cell designs. On the other hand, CDs possess a considerably high amount of surface defects that give rise to two significant drawbacks: (1) causing decrease in quantum yield (QY), a crucial drawback that limits their utilization in LEDs, and (2) affecting the efficiency of charge transfer, a significant factor that limits the use of CDs in photovoltaic cells. In this study, we synthesized highly luminescent, water-insoluble, slightly amphiphilic CDs by using a macrocyclic compound, calix[4]pyrrole, for the first time in the literature. Calix[4]pyrrole-derived CDs (CP-DOTs) were highly luminescent with a QY of over 60% and size of around 4-10 nm with graphitic structure. The high quantum yield of CP-DOTs indicated that they had less amount of surface defects. Furthermore, CP-DOTs were used as an additive in the active layer of organic solar cells (OSC). The photovoltaic parameters of OSCs improved upon addition of CDs. Our results indicated that calix[4]pyrrole is an excellent carbon precursor to synthesize highly luminescent and water-insoluble carbon dots, and CDs derived from calix[4]pyrrole are excellent candidates to improve optoelectronic devices.
Citation - WoS: 10
Citation - Scopus: 10
Efficient Recovery of Itaconic Acid Using Weak and Strong Anion Exchange Resins From Aqueous Solutions
(Amer Chemical Soc, 2024) Can, Cihat Erdem; Zeidan, Hani; Martı, Mustafa Esen
Itaconic acid (IA) has the potential to be one of the industry's most remarkable raw materials, but it must be recovered with high efficiency and selectivity from complex aqueous-based production media. In this study, three types of weak basic anion exchangers (WBAEs, Amberlite IRA-67, Lewatit MP-62, and Lewatit MP-64) and a strong basic anion exchanger (SBAE, Lewatit M-500) were tested for the separation of IA from aqueous solutions. The process was considerably affected by the operating pH, and the highest efficiencies were obtained at pH 3 and 4 with the WBAEs and SBAE, respectively. Equilibration was achieved in similar to 60 min, and the data fitted the pseudo-second-order kinetic model for all resins tested. Decreasing yields with an increase in temperature confirmed the exothermic nature of the process. Isotherm curves demonstrated the consistency of the equilibrium data with Type I. The capacities increased with IA concentrations and decreased with resin doses. Lewatit MP-62 achieved the highest capacity (522.7 mg of IA/g of resin), and its performance was significantly better than those previously reported in the literature. The equilibrium data were in agreement with the Langmuir isotherm model; however, the R 2 values attained with the Freundlich and Temkin models were also relatively high, indicating the need for further isotherm analyses.
Citation - WoS: 20
Citation - Scopus: 19
Electrical and Photodetector Characteristics of Schottky Structures Interlaid With P(eha) and P(eha-Co Functional Polymers by the Icvd Method
(Amer Chemical Soc, 2023) Demirezen, Selcuk; Ulusoy, Murat; Durmuş, Haziret; Çavuşoğlu, Halit; Yılmaz, Kurtuluş; Altındal, Şemsettin
In this study, poly(2-ethylhexyl acrylate) (PEHA) homopolymer and its copolymer combined with acrylic acid P(EHA-co-AA) were employed as interfaces in two separate Schottky structures. First, both interfaces were grown by initiated chemical vapor deposition (iCVD), which provides much better deposition control and homogeneous coating compared to solution-phase methods. In addition to this advantageous method, the effects of two different polymers, one of which is better able to adhere to the crystal surface on which it is formed than the other, on the optoelectronic properties have been studied. Then, their current-voltage (I-V) and capacitance/conductance-voltage (C/(G/omega)-V) characteristics were investigated both in the dark and under illumination. The basic electrical parameters and the illumination-induced profile of the surface state (N-ss) were probed by I-V and C-V measurements for two samples. A decrease in the barrier height (BH) and, consequently, a significant increase in the photocurrent were observed under illumination. Striking changes in series resistance (R-s) values are also highlighted. The photocapacitance and conductance characteristics indicated that the structures could be considered not only as photodiodes but also as photocapacitors. Moreover, the voltage-dependent changes of some photodetector parameters, such as responsivity (R), sensitivity (S), and specific detectivity (D*), along with the transient photocurrent characteristics, are discussed for both structures. Therefore, we can say that the strong changes in these parameters, which figure the merit of photodiode and photodetector applications, depending on the voltage and under illumination, prove that it is a study carried out in accordance with the purpose and so they can be used in electronic and optoelectronic applications.
Citation - WoS: 5
Citation - Scopus: 4
Environmentally Friendly and All-Dry Hydrophobic Patterning of Graphene Oxide for Fog Harvesting
(Amer Chemical Soc, 2024) Yılmaz, Kurtuluş; Gürsoy, Mehmet; Karaman, Mustafa
This study examines the fog-harvesting ability of graphene oxide surfaces patterned by hydrophobic domains. The samples were prepared from graphene deposited using low pressure chemical vapor deposition, which was later plasma oxidized to obtain hydrophilic graphene oxide (GO) surfaces. Hydrophobic domains on GO surfaces were formed by initiated CVD (iCVD) of a low-surface-energy poly(perfluorodecyl alkylate) (PPFDA) polymer. Hence, patterned surfaces with hydrophobic/hydrophilic contrast were produced with ease in an all-dry manner. The structures of the as-deposited graphene and PPFDA films were characterized using Raman and Fourier transform infrared spectrophotometer analyses, respectively. The fog harvesting performance of the samples was measured using the fog generated by a nebulizer, in which the average diameter of the fog droplets is comparable to meteorological fog. According to the fog harvesting experiment results, 100 cm2 of the as-patterned surface can collect fog up to 2.5 L in 10 h in a foggy environment. Hence, hydrophilic/hydrophobic patterned surfaces in this study can be considered as promising fog harvesting materials. Both CVD techniques used in the production of hydrophilic/hydrophobic patterned surfaces can be easily applied to the production of large-scale materials.
Citation - WoS: 2
Citation - Scopus: 2
A Machine Learning-Based Modeling Approach for Dye Removal Using Modified Natural Adsorbents
(Amer Chemical Soc, 2025) Uzbas, Betul; Kocaman, Suheyla
This study used machine learning models to investigate the potential of biosorbents derived from natural fruit seed waste (apricot, almond, and walnut) for removing a cationic dye. Levulinic acid (LA)-modified powders of almond shell (ASh), apricot kernel shell (APKSh), and walnut shell (WSh) were used to remove methylene blue (MB) from an aqueous solution, producing 105 experimental data points under various circumstances. Attributes included pH (3-5), adsorbent dose (0.4-6.0 g/L), concentration (10-500 mg/L), time (30-600 min), and temperature (25-55 degrees C). Species information was incorporated into the data set using the One-Hot Encoding method. The data were normalized using the min-max method, and due to the non-normal distribution of the data, Spearman correlation analysis was employed to rank the importance of the attributes. Gradient Boosting (GB), Multilayer Perceptron (MLP), XGBoost (XGB), and Random Forest (RF) algorithms were applied for regression estimation. Based on 5-fold cross-validation results, the GB model achieved the highest performance, with R2 values of 0.8858 for removal percentage and 0.9532 for adsorption capacity.
A Novel Architecture Based on a Pyrrole-Functionalized Dithieno[3,2-B:2′,3′ (dtp)-Type Conducting Polymer and Thiol-Modified Calixarene Derivative for Biophotovoltaic Solar Cells: Photocurrent and Hydrogen Generations Via Both Photosynthesis and Respiratory System
(Amer Chemical Soc, 2025) Buyukharman, Mustafa; Yildiz, Huseyin Bekir; Bakim, Sumeyye; Marti, Mustafa Esen
This review explores the potential of biophotovoltaic devices (BPVs) as a sustainable solution for addressing the global energy crisis and combating climate change. BPVs generate renewable electricity from sunlight and water through the photosynthetic activity of microorganisms such as cyanobacteria and algae, which act as living photocatalysts. The study essentially focuses on improving photocurrent outputs through developing efficient anode materials. An innovative photoanode design is introduced employing cyanobacteria immobilized on a P(DTP-Ph-Pyr)/Calixarene-AuNP-modified surface. This design features a porous structure conducive to cyanobacterial attachment and efficient electron transfer. As a first step, the conductive polymeric film of 4-(4-(1H-pyrrol-1-yl)phenyl)-4H-dithieno[3,2-b:2 ',3 '-d]pyrrole (DTP-Ph-Pyr) monomer was coated onto a gold electrode via electropolymerization method. Then, a mixture of thiol- and carboxylic group-modified calixarene and gold nanoparticles (AuNPs) was applied to enhance the photoelectrode's performance. The surface of the modified electrode enabled the successful immobilization of Leptolyngbya sp. cyanobacterial cells, providing a reliable interface for efficient photocurrent and hydrogen generation. Calixarenes and their derivatives act as favorable agents for cyanobacterial immobilization due to their specific configurations. Moreover, the formation of covalent bonds between the carboxyl groups of calixarenes and the amino groups in cyanobacteria facilitates the robust immobilization of cyanobacterial cells while maintaining their well-ordered structural integrity and organized cellular architecture. A complementary cathode structure, employing aniline-modified Pt nanoparticles, facilitates the reduction of protons to generate hydrogen gas. Overall, this study underscores the promise of BPVs as feasible clean energy technologies and introduces innovative methods to improve their efficiency and sustainability.
Citation - WoS: 2
Citation - Scopus: 4
Polyaniline-Functionalized Nanosized Cobalt Ferrite-Decorated Mos2 Composites for Broadband Electromagnetic Wave Absorption
(Amer Chemical Soc, 2024) Kivrak, Burak; Akyildiz, Hasan; Akgol, Oguzhan; Karaaslan, Muharrem; Akyol, Mustafa
This study presents the synthesis of polyaniline (PANI)-coated cobalt ferrite-decorated molybdenum disulfide (MoS2@CoFe2O4); a composite architecture engineered to combine unique morphological, magnetic, and dielectric properties for the electromagnetic wave/radar absorption applications. MoS2 and CoFe2O4 were produced separately using a one-step hydrothermal process. Then, the CoFe2O4 nanoparticles were integrated into the flower-like MoS2 nanosheets using the sonication method. Finally, PANI was synthesized through in situ polymerization of aniline on the surface of MoS2@CoFe2O4 to create the final design as well as to boost the dielectric performance. Structural analysis confirmed the existence of the 2H phase and a minor trace of the 1T phase in MoS2, while CoFe2O4 displayed a cubic structure without any detectable impurities. Scanning electron microscopy verified the successful distribution of CoFe2O4 particles within the MoS2 nanosheets, aligning with the design's intended configuration. The electromagnetic wave (EMW) characteristics of the composites were analyzed by using a vector network analyzer. The MoS2@CoFe2O4 demonstrated a broad effective absorption bandwidth, spanning from the X-band to the Ku-band with a minimum matching thickness of just 2 mm. The reflection loss minimum value (RLmin) reached -22.82 dB at 8.96 GHz, corresponding to a 99.47% absorption of the incident EMWs. The addition of PANI at 50% by weight further increased the RLmin value to approximately 99.999% absorption (-50 dB), indicating enhanced impedance matching and absorption efficiency.
Citation - WoS: 2
Citation - Scopus: 2
Polyoxometalate-Doped Hole Transport Layer To Boost Performance of Mapbi3-Based Inverted-Type Perovskite Solar Cells
(Amer Chemical Soc, 2025) Buyukcelebi, Sumeyra; Kazici, Mehmet; Torlak, Yasemin; Kus, Mahmut; Ersoz, Mustafa
This study delves into the examination of the efficiency, stability, and repeatability of perovskite solar cells (PSCs), a focal point in contemporary photovoltaic (PV) technologies. The aim is to address the challenges encountered in PSCs. To achieve this goal, Ge-doped polyoxometalate, a structure of significance in recent molecular electronics, was employed as a dopant in the hole transport layer (HTL). The study investigated alterations in the conductivity, improvements in efficiency, and changes in PV parameters. The utilization of PEDOT/PSS doped with a maximum of 2% GePOM resulted in an average efficiency increase of 27% in PSCs compared with the reference. Moreover, enhancements in stability and repeatability were also noted. Comparatively, the reference PSC operated at an efficiency of 11.18%, while PSCs incorporating 2% GePOM into PEDOT/PSS as the HTL exhibited a notable increase in the efficiency, reaching 14.22%. Furthermore, the champion device exhibited an observed fill factor value of 0.74, a short-circuit current density (J sc) value of 19.78 mA/cm2, and an open-circuit voltage (V oc) value of 0.98 V. Consequently, noteworthy enhancements have been noticed in the PV parameters of PSCs with the introduction of GePOM doping.
Preparation and Characterization of the Mmt@fe₃o_{4< Nanocomposite for Catalytic Degradation of Methyl Yellow: Reaction Parameters and Mechanism Based on the Artificial Neuron Network}
(Amer Chemical Soc, 2025) Altun, Turkan; Acar, Musa Kazim; Gubbuk, Ilkay Hilal
The montmorillonite@iron oxide@silver (MMT@Fe3O4@Ag) nanocomposite, which is recyclable and exhibits high catalytic activity, was evaluated for the degradation of methyl yellow (MY), a carcinogenic azo dye. For this purpose, MMT@Fe3O4 was first synthesized via the coprecipitation method and then Ag was doped to MMT@Fe3O4 via the chemical reduction method. MMT, MMT@Fe3O4, and MMT@Fe3O4@Ag were characterized by various techniques including scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometer, and thermal gravimetric analysis. The results illustrated that MMT@Fe3O4@Ag exhibited a higher catalytic ability than MMT@Fe3O4 toward decolorization of MY with a degradation efficiency of 100% in 10 min at pH 7.1 in the presence of sodium borohydride (NaBH4). Further, some parameters like the amount of NaBH4, initial dye concentration, and pH were also studied to determine optimum reaction conditions. MMT@Fe3O4@Ag could be easily separated and recycled from the reaction medium using an external magnet. Thus, the Ag-doped MMT@Fe3O4 nanocomposite proved to have good catalytic activity, high MY degradation rate and reusability, and easy separation and simple synthesis method. These properties make it a promising catalyst for the treatment of wastewater containing organic pollutants. In addition, artificial neural network (ANN) simulation, which is a mathematical model with an artificial intelligence algorithm, was used for the degradation process. This model was evaluated with the parameters used in the experiment as the input and output layers. Last, the degradation of MY with the synthesized catalyst into different products was demonstrated by high-performance liquid chromatography (HPLC) analysis.
Citation - WoS: 9
Citation - Scopus: 9
Reactive Extraction of Betaine From Sugarbeet Processing Byproducts
(Amer Chemical Soc, 2023) Altinisik, Sinem; Zeidan, Hani; Yilmaz, M. Deniz; Marti, Mustafa E.
Betaine from natural sources is still preferred over its synthetic analogue in secondary industries. It is currently obtained by expensive separation means, which is one of the main reasons for its high cost. In this study, reactive extraction of betaine from sugarbeet industry byproducts, that is, molasses and vinasse, was investigated. Dinonylnaphthalenedisulfonic acid (DNNDSA) was used as the extraction agent, and the initial concentration of betaine in the aqueous solutions of byproducts was adjusted to 0.1 M. Although maximum efficiencies were obtained at unadjusted pH values (pH 6, 5, and 6 for aqueous betaine, molasses, and vinasse solutions, respectively), the effect of aqueous pH on betaine extraction was negligible in the range of 2-12. The possible reaction mechanisms between betaine and DNNDSA under acidic, neutral, and basic conditions were discussed. Increasing the extractant concentration significantly increased (especially in the range of 0.1-0.4 M) the yields, and temperature positively (but slightly) affected betaine extraction. The highest extraction efficiencies (similar to 71.5, 71, and 67.5% in a single step for aqueous betaine, vinasse, and molasses solutions, respectively) were obtained with toluene as an organic phase solvent, and it was followed by dimethyl phthalate, 1-octanol, or methyl isobutyl ketone, indicating that the efficiency increased with decreasing polarity. Recoveries from pure betaine solutions were higher (especially at higher pH values and [DNNDSA] < 0.5 M) than those from vinasse and molasses solutions, indicating the adverse influence of byproduct constituents; however, the lower yields were not due to sucrose. Stripping was affected by the type of organic phase solvent, and a significant amount (66-91% in single step) of betaine in the organic phase was transferred to the second aqueous phase using NaOH as the stripping agent. Reactive extraction has a great potential for use in betaine recovery due to its high efficiency, simplicity, low energy demand, and cost.
Citation - WoS: 10
Citation - Scopus: 11
Roll-To Vapor Deposition of Hydrophobic and Transparent Nano-Adhesive Polymeric Thin Films on Rigid and Flexible Substrates
(Amer Chemical Soc, 2022) Şakalak, Hüseyin; Yilmaz, Kurtuluş; Gürsoy, Mehmet; Karaman, Mustafa
This paper demonstrates the adhesive and hydro- Rool-to-roll phobic modifications of glass, poly(ethylene terephthalate), and iCVD bamboo fabric surfaces using the initiated chemical vapor deposition (iCVD) process. iCVD of functional thin films is an all-dry and low-temperature alternative to the conventional wet coating processes. The as-deposited film is a terpolymer in which ethylhexyl acrylate and acrylic acid units comprised the pressure-sensitive adhesive (PSA) part, while perfluorodecyl acrylate (PFDA) acted as the hydrophobic part due to its low surface energy fluorinated side groups. The PFDA composition in the iCVD terpolymer can be systematically varied by adjusting the initial gas feed fractions of monomers, as verified from FTIR and XPS analyses. The usage of the initiator tertbutyl peroxide during the depositions resulted in high deposition rates up to 80 nm/min at a filament temperature of 230 degrees C. The as-deposited films possessed high optical transparency with high shear and peel strength values. Depending on the chemical composition, the peel strength values were up to 0.5 N/25 mm on flexible PET substrates. After the coating, the highly porous bamboo surface not only became sticky due to the existence of the thin PSA layer on top but also the became near-superhydrophobic. The application of iCVD coating parameters to deposit hydrophobic PSA on moving large-area substrates under roll-to-roll deposition mode resulted in highly uniform coatings, which shows the potential of iCVD to be operated in industrial scales to functionalize the industrially important flexible substrates.
Citation - WoS: 6
Citation - Scopus: 6
Separation of Pimelic Acid Using Tri-N in Various Organic Solvents by Reactive Extraction: Equilibrium and Modeling
(Amer Chemical Soc, 2022) Zeidan, Hani; Yurdakul, Merve; Martı, Mustafa Esen
Separation of carboxylic acids from dilute aqueous solutions is a challenging problem, and reactive extraction has been examined as an attractive alternative for this process. This study aims to investigate the reactive extraction of pimelic acid (PA) using tri-n-octylamine (TOA) in 1-hexanol, 1-octanol, xylene, and n-hexane. The highest extraction efficiency (E (%)) and distribution coefficient (K-D) were obtained at pH 3, which is the unadjusted pH of the aqueous PA solution. Extractive efficiency varied inversely with temperature and initial PA concentration but increased with the increase in TOA amount. The highest E (%) and K-D values (98.5% and 67.2, respectively) were obtained with 1-hexanol at initial TOA and PA concentrations of 0.2700 and 0.0375 mol/kg, respectively. The process was modeled using multilinear regression, and the model closely correlated with experimental results for all organic solvents tested.
Citation - WoS: 5
Transfer of Cvd-Graphene on Real-World Surfaces in an Eco-Friendly Manner
(Amer Chemical Soc, 2023) Yılmaz, Kurtuluş; Gürsoy, Mehmet; Sakalak, Huseyin; Ersoz, Mustafa; Karaman, Mustafa
Here we report a one-step and all-dry transfer method for transfer of chemical vapor deposited graphene (CVD-graphene) on different application surfaces using pressure sensitive adhesive (PSA) material as the transfer medium, which is deposited on the application surface by the initiated CVD (iCVD) method in the form of a thin film. The as-deposited PSA film is a copolymer of acrylic acid and ethylhexyl acrylate, in which the relative amount of each component was shown to be a determining factor for the proper adjustment of the adhesive force required for the adhesion-based transfer process. With the help of the thin PSA film on the real-world application surface, graphene transfer was achieved with ease and at high quality by just peeling off the copper substrate, where CVD-graphene was initially deposited. With the all-dry and eco-friendly transfer procedure outlined in this study, it was possible to transfer graphene to a flexible large-area PET substrate (10 cm x 10 cm) on which higher conductivity values were obtained from the I-V experiments as compared with the graphene transferred using the classical wet approach.

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