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Found: 10 Piece 0.002 sn
Publication year : 2020 ✕Department : Kimya Mühendisliği B ... ✕
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Synthesis of magnetic halloysite nanotube-based molecularly imprinted polymers for sensitive spectrophotometric detection of metoclopramide in urine samples

Nahit AKTAŞ

A novel molecularly imprinted polymer was synthesized on magnetic halloysite nanotube via surface initiated reversible addition-fragmentation chain transfer polymerization in the presence of 2-aminoethylmethacrylamide, 2-Cyano-2-propyl benzodithioate, ethylene glycol dimethacrylate (EGDMA) and azobis(isobutyronitrile) for sensitive and selective spectrophotometric determination of metoclopramide in urine samples. The synthesized imprinted polymer was characterized by several surface characterization techniques and the results indicated there was a thin polymer network on the magnetic halloysit ...More

Article 2020 Mühendislik Fakültesi Materials Science and Engineering: C - Materials For Biological Applications106 147 Views
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Synthesis and preparation of responsive poly(Dimethyl acrylamide/gelatin and pomegranate extract) as a novel food packaging material

Nahit AKTAŞ

In this study a novel and smart multi-functional hydrogel (MFH) was synthesized from N, N dimethyl acrylamide (DMAAm), gelatin, citric acid (CA) and pomegranate extract (PE) for instant and easy monitoring of the color change in MFH due to changes in medium conditions such as pH and temperature. MFH was utilized as food packaging material, equipped with the developed properties. MFH was synthesized with a redox polymerization technique in film form on petri dishes. Mechanical and water resistance properties of MFH were improved by CA and N, N, methylenebisacrylamide, while PE was used to gain ...More

Article 2020 Mühendislik Fakültesi Materials Science and Engineering: C - Materials For Biological Applications108 99 Views
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The synthesis of a novel DDPHC diazonium salt: Investigation of its usability in the determination of phenol and chlorophenols using CV, SWV and DPV techniques

Ali Osman SOLAK

Electrochemical and spectroelectrochemical properties of newly synthesized diazonium salt of 2-(2-(1,3-dioxo- 3,3a-dihydro-1H-isoindol-2(7aH)-yl)-1-(3 methyl-3-phenylcyclobutyl)ethylidene) hydrazinecarboxamide (DDPHC-DAS) were studied using glassy carbon (GC) electrode. In the current study, surface characterization was performed by cyclic voltammetry (CV). Besides electrochemical impedance spectroscopy (EIS) was used for the electrochemical and spectroelectrochemical characterization. Surface images were obtained using scanning electron microscopy (SEM). After completion of modification and c ...More

Article 2020 Mühendislik Fakültesi Inorganic Chemistry Communications116 38 Views
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Boron-containing magnetic nanoparticles from Co, Ni, and Fe chloride salts and their catalytic performances on 4-nitrophenol reduction

Nahit AKTAŞ

In this study, magnetic metal nanoparticles (MNP) were prepared by using Fe, Co and Ni ions and NaBH4 as reducing agents in oil-in-water microemulsion system. The prepared MNP were used as catalyst in 4-Nitro phenol (4-NP) reduction to 4-Aminophenol (4-AP). It was found that magnetic Co MNP performed superior catalytic performances than Fe and Ni MNP for 4-NP reduction. The catalytic reduction experiments revealed that as the concentration of reducing agent, NaBH4 that was used in the preparation of Co MNP was increased, the complete conversion time for 4-NP to 4-AP was decreased as the sizes ...More

Article 2020 Mühendislik Fakültesi Inorganic Chemistry Communications116 108 Views
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Kyrgyz learners' and teachers' experiences and perceptions related to ICT use in high school courses

Bakıt BORKOYEV | Kalıypa SALİYEVA | Gülşat MUHAMETJANOVA

The increasing use of ICT in education results in advantages for teaching and learning processes. In countries, especially in developing ones, it is essential to examine stakeholders' experiences and perceptions about ICT use in the courses. In this regard, this study firstly aims to investigate ICT use of Kyrgyz learners and teachers. Secondly, the study aims to examine learners' and teachers' perceptions with regard to ICT use in Science, Technology, Engineering, and Mathematics (STEM) courses in high schools in the Kyrgyz Republic. In the context of the study, two different questionnaires w ...More

Article 2020 Mühendislik Fakültesi Education and Information Technologies25 ( 6 ) 185 Views
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Preparation of stabilized silver and tin nanocomposites by electrical discharge

Emil ÖMÜRZAK

In this study silver and tin nanocomposites were synthesized by electro spark dispersion in ethanol. Resulting nanocomposite was characterized by using the powder x-ray diffraction and emission scanning electron microscopy. It was found by X-ray phase analysis that the product obtained by electro spark joint dispersion of silver and tin in ethanol consists of two phases: Ag3Sn and beta-Sn. The results of processing SEM micrographs of the product of the Ag-Sn system show that the obtained phases are spherical nanostructures with sizes of 30-60 nm. This size of nanostructures was associated wit ...More

Proceedings Paper 2020 Mühendislik Fakültesi MATERIALS TODAY-PROCEEDINGS31 ( Part 3 ) 103 Views
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Synthesis and characterization of biocompatible poly(maleic acid-co-citric acid) microparticles as a smart carrier for thiamine

Nahit AKTAŞ

Novel biocompatible homo and co-polymeric microparticles were synthesized from maleic acid (MA) and citric acid (CA) for uptake/release thiamine as a model drug. Surfactant-free self-emulsion polymerization technique was accomplished to synthesize the microparticles in a single step. The antimicrobial, antioxidant properties of those microparticles and their thiamine uptake/release capacities were investigated. Fourier transform infrared spectroscopy (FTIR), thermogravimetric analyzer (TGA), particle-size/zeta-potential (Zeta/DLS) and scanning electron microscopy (SEM) instruments were utilize ...More

Article 2020 Mühendislik Fakültesi Polymer Bulletin78 ( 11 ) 138 Views
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DETERMINATION OF NUT PROPERTIES AND CHEMICAL COMPOSITIONS OF WALNUT (JUGLANS REGIA L.) GENOTYPES GROWN IN WALNUT-FRUIT FORESTS OF KYRGYZSTAN

Ali Osman SOLAK | Kalıypa SALİYEVA | İbrahim İlker ÖZYİĞİT | Bakıt BORKOYEV

In this study, sixteen genotypes selected from walnut-fruit forests in the Osh and Jalal-Abad regions of Kyrgyzstan evaluated for nut properties and chemical composition. The nut traits such as nut dimension, nut and kernel weight, kernel ratio, and shell thickness were investigated. The ash, protein, oil, carbohydrate content and fatty acid composition of genotypes were also evaluated. The ranges of average nut characteristics determined for the selected genotypes were: 27.4-32.1 mm nut length; 23.8-28.6 mm nut width; 24.1-29.0 mm nut suture; 7.15-13.17 g nut weight; 3.26-5.65 g kernel weight ...More

Article 2020 Mühendislik Fakültesi Fresenius Environmental Bulletin29 ( 4A ) 48 Views
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Developing poly(Agar-co-Glycerol-co-Thyme Oil) based organo-hydrogels for the controlled drug release applications

Nahit AKTAŞ

In this study, it was aimed to investigate the synthesis, characterization and drug release behaviors of organohydrogels containing pH-sensitive Agar (A), Glycerol (G), Thyme Oil (TO). The novel organo-hydrogels containing TO were prepared in an emulsion media by the free-radical polymerization and crosslinking reactions among Agar (A), Glycerol (G), TO, N, N, methylenebisacrylamide (MBA) or glutaraldehyde (GA) reagent. Swelling ability (ethanol, acetone, ethanol/ID water (1:1), acetone/ID water (1:1) and gasoline environments and different pH), Fourier Transform Infrared Spectroscopy (FTIR) a ...More

Article 2020 Mühendislik Fakültesi Journal of Drug Delivery Science and Technology60 138 Views
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ПЕРСПЕКТИВНЫЕ МЕТОДЫ СОХРАНЕНИЯ КАЧЕСТВ ЯДЕР ОРЕХА (JUGLANS REGIA) ПРИ ХРАНЕНИИ

Kalıypa SALİYEVA | Bakıt BORKOYEV

Масло грецкого ореха пользуется большим спросом из-за высокой пищевой ценности. Однако оно легко окисляется и часто теряет свой типичный аромат. Воздействие кислорода, света, влаги и высокой температуры приводит к окислению жирных кислот и, как было установлено, является основным источником привкуса и снижения качества грецких орехов. Целью данной работы было оценить эффективность различных методов для сохранения качества ядер грецких орехов при хранении. В этом обзоре были изучены самые последние исследования, опубликованные за последние десять лет. В обзорной статье проводится анализ исследо ...More

Article 2020 Mühendislik Fakültesi Успехи современного естествознания ( 12 ) 107 Views
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