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2022

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Articles 1261 - 1290 of 1634

Full-Text Articles in Chemistry

Synthesis, Characterization, Computational Analyses, In Silico Admet Studies, And Inhibitory Action Against Sars-Cov-2 Main Protease (Mpro) Of A Schiff Base, Songül Şahi̇n, Necmi̇ Dege Jan 2022

Synthesis, Characterization, Computational Analyses, In Silico Admet Studies, And Inhibitory Action Against Sars-Cov-2 Main Protease (Mpro) Of A Schiff Base, Songül Şahi̇n, Necmi̇ Dege

Turkish Journal of Chemistry

COVID-19 disease caused by the severe acute respiratory syndrome coronavirus (SARS-CoV-2) has struck the whole world and raised severe health, economic, and social problems. Many scientists struggled to find a vaccine or an antiviral drug. Eventually, both vaccines and recommended drugs, repurposed drugs, or drug combinations were found, but new strains of SARS-CoV-2 continue to threaten human life and health. As part of the fight against COVID-19 disease, this study involves an in silico molecular docking analysis on the main protease (Mpro) of SARS-CoV-2. To this aim, a Schiff base compound was synthesized and characterized using spectroscopic techniques, including X-ray, …

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High-Efficiency Removal Of Cationic Dye And Heavy Metal Ions From Aqueous Solution Using Amino-Functionalized Graphene Oxide, Adsorption Isotherms, Kinetics Studies, And Mechanism, Meti̇n Çelebi̇, Eda Gökirmak Söğüt Jan 2022

High-Efficiency Removal Of Cationic Dye And Heavy Metal Ions From Aqueous Solution Using Amino-Functionalized Graphene Oxide, Adsorption Isotherms, Kinetics Studies, And Mechanism, Meti̇n Çelebi̇, Eda Gökirmak Söğüt

Turkish Journal of Chemistry

GO-NH2 (amino functionalized graphene oxide) was synthesized by grafting (3-aminopropyl) triethoxysilane onto the surface GO (graphene oxide). The GO-NH2 with a higher surface area and many active sites was characterized and its effectiveness in removing Rhod B dye and Ni(II) ions from wastewater by adsorption was observed. The effects of pH, time, and strange ions on the adsorption efficiency were investigated. The equilibrium isotherm data confirmed that it fits the Langmuir and Freundlich isotherm models. GO and GO-NH2 exhibited high adsorption capacity (QM); 2500 (mg L-1) and 3333 (mg L-1) for …

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Single And Selective Transport Of Zr(Iv) Ions With Trioctyl Amine Dissolved In Kerosene Using A Multidropped Liquid Membrane Technique, Fatma Tezcan, Ramazan Donat Jan 2022

Single And Selective Transport Of Zr(Iv) Ions With Trioctyl Amine Dissolved In Kerosene Using A Multidropped Liquid Membrane Technique, Fatma Tezcan, Ramazan Donat

Turkish Journal of Chemistry

It is very important to develop a process for selectively extracting Zr(IV) ions from the solution medium to produce zirconium metal used in industry and nuclear reactors. In this study, the parameters affecting the extraction of Zr(IV) ions were investigated using a multidropped liquid membrane (MDLM) system. Trioctyl amine (TOA) dissolved in kerosene was used as a carrier ligand in the extraction of Zr(IV) ions by the MDLM technique. The effect of carrier concentration and stripping solution concentration, pH, and the temperature in the donor phase on the transport of Zr(IV) were investigated. The optimum condition for the transportation of …

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A Study Of Silicon And Germanium-Based Molecules In Terms Of Solar Cell Devices Performance, Emi̇ne Taniş Jan 2022

A Study Of Silicon And Germanium-Based Molecules In Terms Of Solar Cell Devices Performance, Emi̇ne Taniş

Turkish Journal of Chemistry

Photovoltaic energy sources are increasingly in demand due to the cost of petroleum fuels and concerns about carbon emissions. For this reason, it is important to determine the photovoltaic properties of the compounds that are thought to be suitable for these energy sources. Here, 1,1,2,3,4,5-Hexaphenyl-1H-silole (HPS) and 1,1,2,3,4,5-Hexaphenyl-1H-germole (HPG) compounds that are thought to have excellent photovoltaic properties, electronic and charge transport properties were investigated experimentally and theoretically. The total energies, absorption spectra, Fermi energy (Efl) and work function (φ), maximum open circuit voltage (VOC), reorganization energies (λe and λh), frontier molecular orbital …

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L-(+)-Tryptophan Methyl Ester Derived Polymeric Microbeads As An Efficient Heterogeneous Catalyst For Green Synthesis Of 2-Amino-4-(Nitromethyl)-4h-Chromene-3- Carbonitriles, Ayşe Haliç Poslu, Bi̇lgen Osman, Yunus Kaya, Ömer Koz, Gamze Koz Jan 2022

L-(+)-Tryptophan Methyl Ester Derived Polymeric Microbeads As An Efficient Heterogeneous Catalyst For Green Synthesis Of 2-Amino-4-(Nitromethyl)-4h-Chromene-3- Carbonitriles, Ayşe Haliç Poslu, Bi̇lgen Osman, Yunus Kaya, Ömer Koz, Gamze Koz

Turkish Journal of Chemistry

The cross-linked microbeads with average diameter of 106-300 μm, [poly(EGDMA-MATrp)], were obtained by copolymerization reaction of N-methacryloyl-L-(+)-tryptophan methyl ester (MATrp) with ethylene glycol dimethacrylate (EGDMA) and successfully applied as a heterogeneous catalyst in conjugate addition reaction of nitromethane to substituted 2-iminochromenes in aqueous media. A variety of 2-amino-4-(nitromethyl)-4H-chromene-3-carbonitriles has been synthesized in good yields. Polymeric microbeads were very durable and reused 5 times without a significant loss of activity. DFT calculations and experimental results revealed the significant role of π-π interactions as well as hydrogen bonding in the reaction mechanism.

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Study Of Silanized Nanostructures With Immobilized Fumarase For Production Of L-Malate, Nevra Öztürk Atay, Kevser Kuşat, Si̇nan Akgöl Jan 2022

Study Of Silanized Nanostructures With Immobilized Fumarase For Production Of L-Malate, Nevra Öztürk Atay, Kevser Kuşat, Si̇nan Akgöl

Turkish Journal of Chemistry

The conversion of fumaric acid into L-malate by fumarase immobilized on silanized nanostructures was analyzed experimentally. The enzyme was bound to the silanized nanostructures. We carried out scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) analysis, zeta size analysis and surface area calculation for the characterization of the nanostructures. The effect of initial enzyme concentration and pH on immobilization procedure were investigated and the change of Michaelis-Menten constants (Km and Vmax) with immobilization was examined. The change in the storage stability of the enzyme by immobilization was also investigated. The stability of the immobilized enzyme was …

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Moo3, Tio2, And Motio5 Based Oxide Semiconductor For Photovoltaic Applications, Fatma Bayrakçeken Jan 2022

Moo3, Tio2, And Motio5 Based Oxide Semiconductor For Photovoltaic Applications, Fatma Bayrakçeken

Turkish Journal of Chemistry

Topographic essential synthesis of nanomaterials by adjusting easy preparatory factors is an effective way to improve a variety of nanostructured materials. The SILAR technique is used to evaluate the manufacturing samples of MoO3, TiO2, and MoTiO5 nanostructures. These nanostructures of MoO3, TiO2, and MoTiO5 are used as electrode materials in photovoltaic systems. The link between photoelectrochemical characteristics and MoO3, TiO2, and MoTiO5 nanostructures is studied in depth. The photoelectrochemical characteristics of MoO3, TiO2, and MoTiO5 nanostructures are discovered to be …

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Synthesis And Characterization Of A Series Of Conducting Polymers Based On Indole And Carbazole, Mehmet Ergi̇ner, Belkis Ustamehmetoğlu, Esma Sezer Jan 2022

Synthesis And Characterization Of A Series Of Conducting Polymers Based On Indole And Carbazole, Mehmet Ergi̇ner, Belkis Ustamehmetoğlu, Esma Sezer

Turkish Journal of Chemistry

A series of indole (In) and carbazole (Cz) derivative monomers have been synthesized, such as 4-[3-carbazolyl] indole (4In-3Cz), 5-[3-carbazolyl] indole (5In-3Cz), 6-[3-carbazolyl] indole (6In-3Cz), 7-[3-carbazolyl] indole (7In-3Cz). The comonomers synthesized by Stille coupling reaction were characterized by 1H-NMR and elemental analysis. Potentiodynamic method was used for electropolymerization of comonomers, Indole, Cz, and the mixture of In and Cz. Electrochemical activities of resulting P[4In-3Cz], P[5In-3Cz], P[6In-3Cz], P[7In-3Cz], polyindole (PIn), polycarbazole (PCz) and P[In-co-Cz] films were investigated comparatively by CV at different scan rates, electrochemical impedance spectroscopy (EIS) and spectroelectrochemical measurements. The ionization potentials, Ip, specific capacitance, Csp, and optical band gap, …

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The Effect Of A Phosphorus-Based Fr On The Fire Performance And Flammability Properties Of Basalt Fiber-Reinforced Acrylonitrile-Butadiene-Styrene Composites, Çağrialp Arslan, Mehmet Doğan Jan 2022

The Effect Of A Phosphorus-Based Fr On The Fire Performance And Flammability Properties Of Basalt Fiber-Reinforced Acrylonitrile-Butadiene-Styrene Composites, Çağrialp Arslan, Mehmet Doğan

Turkish Journal of Chemistry

This study focuses on the improvement in fire performance, and flame retardancy (FR) properties of chopped basalt fiberreinforced acrylonitrile-butadiene-styrene (ABS) composites. For this purpose, different amounts of aluminum diethyl phosphinate (AlPi) compound (5, 10, and 15 wt%) were incorporated in the composites. The FR properties of the composites were examined via limiting oxygen index (LOI), UL-94 standard, and mass loss calorimeter tests. Thermogravimetric analysis was carried out to analyze the decomposition behavior of the composites. SEM inspection was also performed to examine the char surfaces of the composites. The results and findings showed that the introduction of AlPi compound into …

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Release Of Nifedipine, Furosemide, And Niclosamide Drugs From The Biocompatible Poly(Hema) Hydrogel Structures, Bahar Yilmaz Jan 2022

Release Of Nifedipine, Furosemide, And Niclosamide Drugs From The Biocompatible Poly(Hema) Hydrogel Structures, Bahar Yilmaz

Turkish Journal of Chemistry

The primary aim of this article was to improve the solubility and bioavailability of the drugs nifedipine, niclosamide, and furosemide due to their poor solubility and dissolution rate. Therefore, these drugs require improvement in solubility and dissolution rate in formulation development, especially in solid dosage forms such as hydrogels and capsules. Hydrogel structures were synthesized by using a biocompatible, nontoxic, and protective pure 2-hydroxy ethyl methacrylate (HEMA) monomer. These hydrogel structures were characterized by various techniques such as scanning electron microscopy and Fourier-transformed infrared spectroscopy. In the next step, drug molecules were loaded in the poly (HEMA) hydrogels. Drug releases …

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Assessment Of Environmental Pollutants At Trace Levels Using Ionic Liquids-Based Liquid-Phase Microextraction, Furkan Uzcan, Muhammad Saqaf Jagirani, Mustafa Soylak Jan 2022

Assessment Of Environmental Pollutants At Trace Levels Using Ionic Liquids-Based Liquid-Phase Microextraction, Furkan Uzcan, Muhammad Saqaf Jagirani, Mustafa Soylak

Turkish Journal of Chemistry

Sample preparation is the crucial and most challenging part of analytical chemistry for the speciation of environmental pollutants' traces. Along with the development of the sample preparation methods, the ionic liquid-based microextraction technique plays an important role. Due to the unequivocally unique "green" characteristic of ionic liquids (ILs), they owe their tunable properties, such as highly selective and high reaction efficiency, reusability, and good thermal stability, to present advancements in the sample preparation process. The ionic liquid-based microextraction techniques miniaturize the sample preparation process. Liquid phase microextraction intermediate solvents, desorption solvent extractants, and mediators have been used. They are quoting …

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Chemical Compositions And Biological Activities Of The Oils From The Genus Taxus And Factors Limiting The Regeneration Of Endangered Yews: A Review, Sagar Dhakal, Prem Kumar Khosla, Tokuma Getahun Jan 2022

Chemical Compositions And Biological Activities Of The Oils From The Genus Taxus And Factors Limiting The Regeneration Of Endangered Yews: A Review, Sagar Dhakal, Prem Kumar Khosla, Tokuma Getahun

Turkish Journal of Chemistry

The genus Taxus (yews) is the largest genus of the family Taxaceae. It comprises about 24 species with 55 varieties distributed mainly in Asia, Europe, North Africa, and North America. In addition to the taxane diterpenoids and the cancer drug taxol, its species contain many essential oils with actual or potential biological activity. This review covers the chemical constituents as well as biological activities of these oils that have been studied in fourteen countries over 46 years (1975-2021). It also discusses the biotic and abiotic factors that limit the regeneration of these economically and medicinally important plants.

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Silver Nanoparticles (Agnps) Based Selective Colorimetric Sensor For The Detection Of D-Arabinitol In A Urine Sample, Yuni Retnaningtyas, Siswandono Siswodihardjo, Ari Satia Nugraha Jan 2022

Silver Nanoparticles (Agnps) Based Selective Colorimetric Sensor For The Detection Of D-Arabinitol In A Urine Sample, Yuni Retnaningtyas, Siswandono Siswodihardjo, Ari Satia Nugraha

Turkish Journal of Chemistry

D-arabinitol is a sugar alcohol that is a typical metabolite of Candida species. The hydroxy group owned by D-arabinitol can function as a reducing agent that can reduce Ag+ to AgNPs. The resulting colloid is further stabilized by the addition of a capping agent. The capping agent used in this study was a combination of chitosan 1%(w/w) and PEG 6000 1% (w/w) (2:1) v/v. The formation of AgNPs causes an increase in the surface plasmon resonance spectra of the colloid solution at a wavelength of 430 nm with a slight blue shift. At the same time, the color of …

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Design, Synthesis, And Greener Pasture Biological Assessment Of A Novel Nucleoside: 1-(Α-D-Ribofuranosyl)-6,7-Difluoro-2-Methyl-4-Quinazolinone As An Inhibitor Of Covid-19 And Alzheimer's Disease, Laila M. Break, Adil A. Gobouri, Wafa S. Al-Harthi, Mohamed Hagar, Nadia S. Alkaff, Musa A. Said Jan 2022

Design, Synthesis, And Greener Pasture Biological Assessment Of A Novel Nucleoside: 1-(Α-D-Ribofuranosyl)-6,7-Difluoro-2-Methyl-4-Quinazolinone As An Inhibitor Of Covid-19 And Alzheimer's Disease, Laila M. Break, Adil A. Gobouri, Wafa S. Al-Harthi, Mohamed Hagar, Nadia S. Alkaff, Musa A. Said

Turkish Journal of Chemistry

Synthesis of a new fluorinated nucleoside of 6,7-difluoro-2-methyl-4-quinazolinone was described. 2-Amino-4,5-difluorobenzoic acid 1 reacts with (CH3CO)2O followed by ammonia to form (1H)-6,7-difluoro-2-methyl-4-quinazolinone 3a. Ribosylation of a silylated 4 with l-O-acety1-2,3-5-tri-O-benzoyl-α-D-ribofuranose 5 forms a protected nucleoside 6 then unprotected from 6 to give a free nucleoside 7. Greener pasture biological docking of the cystine protease of COVID-19 [Mpro, code 7BQY, PDB] by novel nucleoside and fluoroquinazoline compounds is presented. LIGPLOT (2D) representations calculated for the same ligands are shown. A superposition of remdesivir approved medicine, N3 inhibitor, and our ligands docked …

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Comparative Study And Dyeing Performance Of As-Synthesized Azo Heterocyclic Monomeric, Polymeric, And Commercial Disperse Dyes, Shehu Sa'ad Abdullahi, Haruna Musa, Shehu Habibu, Abdullahi Haruna Birniwa, Rania Edrees Adam Mohammad Jan 2022

Comparative Study And Dyeing Performance Of As-Synthesized Azo Heterocyclic Monomeric, Polymeric, And Commercial Disperse Dyes, Shehu Sa'ad Abdullahi, Haruna Musa, Shehu Habibu, Abdullahi Haruna Birniwa, Rania Edrees Adam Mohammad

Turkish Journal of Chemistry

In this study poly (4-nitrophenylazo-3-aminopyridine - formaldehyde) (PNAAP-F) and poly (4-nitroarylazo-3-chloro-6-hydroxypyridine - formaldehyde) (NAACHP-F) were synthesized via diazotization, coupling and polycondensation reactions. The structural properties of the as-synthesized dyes were acquired using Fourier-transform infrared spectroscopy (FTIR) and UV-visible absorption maxima and their color, yield, melting point, solubility, and viscosity were determined via standard methods. UV-visible and FTIR results show successful formation of the polymeric dyes due to shift of wavelength of maximum absorption (λmax) (440-490 nm, 480-540 nm) and new absorption peak at around (2780-2995 cm-1) for methylene bridge respectively. The dyes were found to be …

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A Molecularly Imprinted Polymer As Solid Phase Extraction Sorbent For Ketoprofen Determination In Water And Artificial Serum Prior To Hplc, Eli̇f Gürel Özyurt, Ömer Özyurt, Yekta Arya Ölçer Altinsoy, Ahmet Emi̇n Eroğlu, Ezel Boyaci, Talal Shahwan Jan 2022

A Molecularly Imprinted Polymer As Solid Phase Extraction Sorbent For Ketoprofen Determination In Water And Artificial Serum Prior To Hplc, Eli̇f Gürel Özyurt, Ömer Özyurt, Yekta Arya Ölçer Altinsoy, Ahmet Emi̇n Eroğlu, Ezel Boyaci, Talal Shahwan

Turkish Journal of Chemistry

Ketoprofen (KET) is an active pharmaceutical compound that has pain relieving and antipyretic effects. Its determination in body fluids and environmental waters is important due to widespread use of the compound. In this study, a selective and reliable method has been developed for the determination of ketoprofen in water and artificial serum using molecularly imprinted polymers (MIPs) as a solid phase extraction sorbent prior to HPLC-DAD detection. The MIP was synthesized by copolymerization of methacrylic acid (MAA) and trimethylpropane trimethacrylate (TRIM) in the presence of ketoprofen as the template. For the sake of comparison, nonimprinted polymer (NIP) was also synthesized …

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Photocatalytic Degradation Of Paracetamol By Semiconductor Oxides Under Uv And Sunlight Illumination, Derman Akşi̇t, Güli̇n Selda Pozan Soylu Jan 2022

Photocatalytic Degradation Of Paracetamol By Semiconductor Oxides Under Uv And Sunlight Illumination, Derman Akşi̇t, Güli̇n Selda Pozan Soylu

Turkish Journal of Chemistry

In this study, photocatalytic degradation of paracetamol (acetaminophen), an analgesic and antipyretic drug, was investigated in using semiconductors under UV-B and sunlight irradiation. Semiconductor materials, Bi2O3, ZnO, TiO2, and ZrO2, were prepared using simple sol-gel, coprecipitation, and microwave synthesis methods. These photocatalyts were characterized by various spectroscopic and other techniques. As a result of the reactions, 25 ppm paracetamol with Bi2O3 and ZnO photocatalyst, total degradation was achieved with UV-B irradiation in 90 min. The results of photocatalytic activities showed that the highest degradation rate was obtained with the …

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Morphological, Microstructural And Photocatalytic Characterization Of Undoped And Ni, Co Doped Fe2o3 Particles Synthesized By Sonochemical Method, Eli̇f Emi̇l Kaya, Burak Evren, Zeynep Erdöl, Duygu Eki̇nci̇, Mehmet İpekoğlu, Si̇bel Özenler Jan 2022

Morphological, Microstructural And Photocatalytic Characterization Of Undoped And Ni, Co Doped Fe2o3 Particles Synthesized By Sonochemical Method, Eli̇f Emi̇l Kaya, Burak Evren, Zeynep Erdöl, Duygu Eki̇nci̇, Mehmet İpekoğlu, Si̇bel Özenler

Turkish Journal of Chemistry

In this study, an abundant and eco-friendly photocatalytic material, Fe2O3 particles were synthesized by sonochemical method. Morphological and microstructural investigations of synthesized undoped and Ni, Co-doped Fe2O3 particles were performed. The effect of particle morphology and microstructure on its photocatalytic performance was further investigated. Comparative studies for evaluating particle crystallite sizes were conducted by Williamson-Hall (W-H) method and modified Debye-Scherrer (MDS). Crystallite sizes and lattice strains of Fe2O3 induced by process parameters were calculated by W-H method based on uniform deformation model (UDM). The crystallite sizes of the synthesized powders were …

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Thermal Versus Photochemical Tautomerization Of Cytosine And Guanine: A Blyp Computational Study Along The Irc Curves, Tsvetina Cherneva, Vassil Delchev Jan 2022

Thermal Versus Photochemical Tautomerization Of Cytosine And Guanine: A Blyp Computational Study Along The Irc Curves, Tsvetina Cherneva, Vassil Delchev

Turkish Journal of Chemistry

We performed a theoretical study, at the BLYP/aug-cc-pVDZ theoretical level, of the mechanisms of H-transfer between biologically relevant tautomers of cytosine and guanine. The analysis of the ground- and excited state energy barriers of the conversions showed that in some cases they are lower as compared to the ground state reactions. The inclusion of one water molecule as a catalyst in the oxo-amino form of cytosine and guanine drastically changes the mechanism of the reactions in the ground as well as in the excited state. For example, the ground state reaction path of cytosine reduces the energy barrier from 165 …

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Study On Moo3/Sba-16 Catalyzed Transesterification To Synthesize Diphenyl Carbonate, Ying Li, Shunwu He Jan 2022

Study On Moo3/Sba-16 Catalyzed Transesterification To Synthesize Diphenyl Carbonate, Ying Li, Shunwu He

Turkish Journal of Chemistry

In this paper, the mesoporous molecular sieve SBA-16 with good dispersion was prepared by hydrothermal method. Under the condition of Si/Mo= 1.0, MoO3/SBA-16 catalysts were prepared by iso-dipping method at 550 °C, 650 °C and 750 °C calcination temperature, which for the synthesis of diphenyl carbonate (DPC) from dimethyl carbonate (DMC) and phenyl acetate (PA) was used, and the uncalcined MoO3/SBA-16 was used as a reference. XRD, TG-DTA, XPS, ICP-MS, FT-IR, BET, SEM and TEM characterization. The effects of calcination temperature and reaction conditions on the catalytic performance of MoO3/SBA-16 in transesterification of DMC and PA …

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Adsorptive Removal Of Crystal Violet From Aqueous Solution By Ultrasonic-Assisted Synthesized Zirconium-2,6-Naphthalenedicarboxylate Metal-Organic Framework, Penmethsa Kiran Kumar, Sunkara Satya Veni Jan 2022

Adsorptive Removal Of Crystal Violet From Aqueous Solution By Ultrasonic-Assisted Synthesized Zirconium-2,6-Naphthalenedicarboxylate Metal-Organic Framework, Penmethsa Kiran Kumar, Sunkara Satya Veni

Turkish Journal of Chemistry

Zirconium-2,6-naphthalenedicarboxylate metal-organic framework (Zr-NDC MOF) was prepared using ultrasound-assisted synthesis and tested for the adsorptive removal of crystal violet (CV) dye from aqueous solution. The pristine Zr-NDC was characterized using powder X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and energy-dispersive X-ray spectroscopy, Fourier-transform infrared, elemental analysis, and dynamic light scattering techniques. The maximum percentage removal of CV dye was found to be 99.45% with an initial dye concentration of 10 mg L-1. The kinetics and adsorption isotherm models were used to investigate the removal of CV dye from aqueous solution using Zr-NDC. Langmuir adsorption isotherm model (R2 …

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Synthesis, Characterization, And Antimicrobial Evaluation Of Polyvinylalcohol-Osthol Composite Films, Ishrat Gowsia, Feroz Mir, Javid Banday Jan 2022

Synthesis, Characterization, And Antimicrobial Evaluation Of Polyvinylalcohol-Osthol Composite Films, Ishrat Gowsia, Feroz Mir, Javid Banday

Turkish Journal of Chemistry

Although poly-vinyl alcohol (PVA) has certain mechanical drawbacks such as a weak barrier, it has widely been used in food packaging over the last many years. To increase the suitability of PVA (C2H4O)n and render it ideal for food packaging, a diversity of studies have already been carried out. In the below-mentioned script, we, for the first time, report the use of natural product osthol in making a new composite with PVA for enhancing thermal, physicochemical, and antimicrobial properties. The significant aim of the report is the insertion of osthol (C15H16O3 …

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Miscibility And Thermal Behavior Of Poly(Methyl Methacrylate) And Polystyrene Blend Using Benzene As A Common Solvent, Arshiya Iqbal, Jamil Muhammad, Farzana Ahmad, Mohsan Nawaz, Musa Kaleem Baloch, Luqman Mohammad Jan 2022

Miscibility And Thermal Behavior Of Poly(Methyl Methacrylate) And Polystyrene Blend Using Benzene As A Common Solvent, Arshiya Iqbal, Jamil Muhammad, Farzana Ahmad, Mohsan Nawaz, Musa Kaleem Baloch, Luqman Mohammad

Turkish Journal of Chemistry

Polymer blending is one of the advanced technologies to attain polymeric material with tailored properties. In this work, the miscibility of Poly(methyl methacrylate) (PMMA) and Polystyrene (PS) blend in benzene was investigated by employing various techniques such as FTIR spectroscopy, viscosity measurement technique, light scattering techniques, DSC and TGA techniques over an extended range of concentrations, compositions, and temperatures. The results revealed that there exist hydrogen bonding and hydrodynamic interactions which led these polymers to get miscible to a large extent. The compatibility increased with the increasing PS contents or increase in temperature of the system. In addition, the thermal …

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Polyvinyl Alcohol-Citrate-Stabilized Silver Nanoparticles As An Optical Sensor For Selective Colorimetric Determination Of Sildenafil, Asi̇ye Aslihan Avan Jan 2022

Polyvinyl Alcohol-Citrate-Stabilized Silver Nanoparticles As An Optical Sensor For Selective Colorimetric Determination Of Sildenafil, Asi̇ye Aslihan Avan

Turkish Journal of Chemistry

A facile and sensitive colorimetric detection method for sildenafil citrate (SLDC) has been developed by using polyvinyl alcohol-citrate-stabilized silver nanoparticles (PVA-Cit-AgNPs). The sensitivity and selectivity of colorimetric detection were investigated in detail. The PVA-Cit-AgNPs could be induced to aggregate immediately in the presence of SLDC, especially after the addition of 0.1 M HCl solution. The SLD could be detected by the colorimetric response of AgNPs that could be monitored by a UV-Vis spectrophotometer or even the naked eye. The linear range was found to be 0.6-5.0 μM with the calculated detection limit of 0.1 μM and the naked-eye detection limit …

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Kinetic, Isotherm, And Thermodynamic Studies For Adsorptive Removal Of Basic Violet 14 From Aqueous Solution, Yasemi̇n Tamer, Hale Berber Jan 2022

Kinetic, Isotherm, And Thermodynamic Studies For Adsorptive Removal Of Basic Violet 14 From Aqueous Solution, Yasemi̇n Tamer, Hale Berber

Turkish Journal of Chemistry

In this study, the performance of chitosan based semi-IPN nanocomposite hydrogels for the adsorptive removal of basic violet 14 (BV14) from aqueous solution has been explored. Batch adsorption studies were conducted to determine the effect of various parameters on BV14 adsorption, and optimum values were reported as pH of 8, the adsorbent dosage of 0.025 g, initial BV14 concentration of 5 mg L-1 and contact time of 90 min at a temperature of 25 °C. The semi-IPN hydrogel containing 0.5% by weight GO showed the improved adsorption capacity for BV14 compared to the neat hydrogel adsorbent, and the maximum …

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Quaternarization And Polymerization Of 2-Chloroethyl Maleate Derivative Of Epoxidized Soybean Oil, Demet Gürbüz Jan 2022

Quaternarization And Polymerization Of 2-Chloroethyl Maleate Derivative Of Epoxidized Soybean Oil, Demet Gürbüz

Turkish Journal of Chemistry

As a potent antibacterial, antifungal or antiviral material, synthesis of quaternarized epoxidized soybean oil was demonstrated in this work. The first step of the synthesis is the reaction of epoxidized soybean oil (ESO) with 2-chloroethyl maleic acid (Cl-MA-ESO). The last step is quaternarization of this condensate with triethylamine (Q-MA-ESO). All the synthesized monomers were characterized by FTIR and 1H NMR techniques. Homopolymer of the quaternarized derivative (Q-MA-ESO) was not obtained. However, styrene copolymers were obtained and characterized. Thermal properties of the copolymers were determined by TGA and DSC techniques. Additionally, swelling properties of the materials were also evaluated. The …

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Removal Of Polycyclic Aromatic Hydrocarbons (Pahs) From Water Through Degradable Polycaprolactone Electrospun Membrane, Fuat Topuz Jan 2022

Removal Of Polycyclic Aromatic Hydrocarbons (Pahs) From Water Through Degradable Polycaprolactone Electrospun Membrane, Fuat Topuz

Turkish Journal of Chemistry

Polycyclic aromatic hydrocarbons (PAHs) are common and persistent environmental pollutants produced during the incomplete combustion of fuels. They are known for their carcinogenic and mutagenic properties. Thus, their removal from water bodies is highly crucial and has become a critical issue globally. As a solution, here an electrospun polycaprolactone (PCL) membrane with a mean fiber diameter of 2.74 ± 1.3 μm was produced by electrospinning. Water contact angle (WCA) analysis confirmed the hydrophobic nature of the PCL membrane with a WCA of 124°, which remained stable over time. Differential scanning calorimetry analysis (DSC) revealed the semicrystalline nature of the membrane …

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The Relation Between Surface Acidity And Moo3:Al2o3 Ratio On The Ternary Mixed Oxide Catalysts For The Conversion Of Propan-2-Ol, Hani Zeidan, Ebru Erünal, Mustafa Esen Marti Jan 2022

The Relation Between Surface Acidity And Moo3:Al2o3 Ratio On The Ternary Mixed Oxide Catalysts For The Conversion Of Propan-2-Ol, Hani Zeidan, Ebru Erünal, Mustafa Esen Marti

Turkish Journal of Chemistry

In this study, ternary mixed oxide catalysts containing Al2O3-MoO3-MgO and Al2O3-MoO3-WO3 were prepared with a changing ratio of MoO3:Al2O3 between 0.05 and 20.00. All catalysts showed 100% selectivity towards propene during the conversion of propan-2-ol at temperatures between 220 and 400 °C. The catalysts prepared from WO3 possessed very strong acid sites, which cause higher catalytic activity than catalysts prepared from MgO. Besides, the ratio of MoO3:Al2O3 was found to be directly proportional to the conversion …

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Investigation Of Glycerol Electrooxidation Activity Of Carbon Supported Pdcu Bimetallic Electrocatalyst, Kübranur Ağtoprak, Merve Doğan Özcan, Ayşe Ni̇lgün Akin, Rami̇z Gülteki̇n Akay Jan 2022

Investigation Of Glycerol Electrooxidation Activity Of Carbon Supported Pdcu Bimetallic Electrocatalyst, Kübranur Ağtoprak, Merve Doğan Özcan, Ayşe Ni̇lgün Akin, Rami̇z Gülteki̇n Akay

Turkish Journal of Chemistry

In this study, Pd/C, Cu/C, and a series of PdCu/C bimetallic electrocatalysts were prepared by microwave-assisted modified polyol method to determine glycerol electrooxidation reaction (GOR) activities. The effect of microwave duration on catalyst structure and GOR activity was investigated on PdCu/C bimetallic catalysts. Also, a commercial Pd/C (com-Pd/C) was used to compare catalytic activities with prepared samples. Electrocatalysts were characterized by using X-ray Diffraction (XRD), Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), and Transmission Electron Microscopy (TEM) analyses. In addition, the activity and stability of electrocatalysts for GOR were examined by using cyclic voltammetry (CV) and chronoamperometry (CA). In XRD …

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Determination Of Si/Graphite Anode Composition For New Generation Li-Ion Batteries: A Case Study, İlknur Kalafat, Nesli̇han Yuca Jan 2022

Determination Of Si/Graphite Anode Composition For New Generation Li-Ion Batteries: A Case Study, İlknur Kalafat, Nesli̇han Yuca

Turkish Journal of Chemistry

Silicon with the properties of high capacity capability, moderate working potential, environmental sensitivity, and existence are the highly promising anode materials for lithium-ion batteries. Silicon anodes have disadvantageous properties and advantages like 300% volume change during lithium insertion and extraction process that can result in capacity fading and a shorter lifetime of the battery. In the literature, different optimizations of Silicon with different nanomaterials or composite materials, in different ratios, and with different binders and different procedures have been studied. The physical mixing of silicon with carbon provides a good performance by combining the high lithium storage capacity of the …

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