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Bulunan: 9 Adet 0.001 sn
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Bulunan: 9 Adet 0.001 sn
Veri Tabanları : Web of Science Core ... ✕Araştırmacılar : Emil ÖMÜRZAK ✕
Koleksiyon [2]
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BM Sürdürülebilir Kalkınma [5]
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Yayın Türü [2]
Yayımlanma Yılı [4]
Dil [1]
Kaynak [8]
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Bölümü [2]
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Konu Başlıkları [32]
Yrd. Doç. Dr. Emil ÖMÜRZAKMühendislik Fakültesi
Erişime Açık

Eco-Friendly Synthesis of Silver Nanoparticles Using Pulsed Plasma in Liquid: Effect of Surfactants

Emil ÖMÜRZAK

Silver (Ag) nanoparticles were successfully prepared by using the in-liquid pulsed plasma technique. This method is based on a low voltage, pulsed spark discharge in a dielectric liquid. We explore the effect of the protecting ligands, specifically Cetyl Trimethylammonium Bromide (CTAB), Polyvinylpyrrolidone (PVP), and Sodium n-Dodecyl Sulphate (SDS), used as surfactant materials to prevent nanoparticle aggregation. The X-Ray Diffraction (XRD) patterns of the samples confirm the face-centered cubic crystalline structure of Ag nanoparticles with the presence of Ag2O skin. Scanning Transmission ...Daha fazlası

Makale 2022 Mühendislik Fakültesi Surfaces5 ( 1 ) 77 Görüntülenme
Erişime Açık

Activated Carbon for Wastewater Treatment from Phenol Compounds

Külümkan SARTOVA | Emil ÖMÜRZAK

Application of activated carbon (AC) obtained from cotton wastes (bolls, stems, and roots) for phenol adsorp-tion from water, or wastewater dephenolization, is presented. The kinetics of phenol adsorption by carbon adsor-bents were studied using UV/Vis spectrophotometer. The porosity of the formed ACs ranged from 1.952 to 2.339 cm3/g, the volume of macropores was from 1.79 to 2.09 cm3/g, while the commercial sample BAU-A showed 1.920 and 1.320 cm3/g, respectively. The highest phenol adsorption rate, 32.49-52.80 mg/(g center dot min), was observed for contact time up to 5 min on carbon adsorben ...Daha fazlası

Makale 2022 Mühendislik Fakültesi Chemistry for Sustainable Development30 ( 3 ) 13 Görüntülenme
Erişime Açık

Activated carbon obtained from the cotton processing wastes

Külümkan SARTOVA | Emil ÖMÜRZAK | Bakıt BORKOYEV

Activated carbon (AC) was obtained from the cotton (Gossypium malvaceae) processing waste materials. The process was carried out by carbonization at 500–800 °C and subsequent activation at 800 °C by water stream. Cotton biomass is a renewable, low-cost alternative source for textile and food products; however, it hasn't been used for manufacturing of an activated carbon by carbonization in a boiling layer method. Characterization of adsorbents by means of Scanning Electronic Microscope and FT-IR showed that high porosity of carbonized products which was achieved and functional groups were form ...Daha fazlası

Makale 2019 Mühendislik Fakültesi Diamond and Related Materials91 180 Görüntülenme
Erişime Açık

Thermal and Optical Properties of In and In2O3 Nanoparticles Synthesized Using Pulsed Plasma in Water

Emil ÖMÜRZAK

We present small indium (In) nanoparticles with an average diameter of 4.5 nm synthesized by pulsed plasma in water. Slightly increased lattice constants and thermal stability of the tetragonal In are revealed by X‐ray diffraction analysis, Rietveld refinement, and thermogravimetric analysis. The highly crystalline body‐centered cubic indium oxide (In2O3) nanoparticles with an average diameter of 12 nm and various shapes (semispherical, semihexagonal, and semicubic) are obtained by annealing the as‐synthesized In nanoparticles at 450 °C. The bandgap energy of the In2O3 nanoparticles is 3.63 eV ...Daha fazlası

Makale 2018 Mühendislik Fakültesi Physica Status Solidi (A) – Applications and Materials Science215 ( 11 ) 65 Görüntülenme
Erişime Açık

Synthesis of Nanomaterials by the Pulsed Plasma in Liquid and their Bio-medical Applications

Emil ÖMÜRZAK | Ruslan ADİL AKAY TEGİN

Pulsed plasma in liquid is a simple, ecologically friendly, cost-efficient method based on electrical discharge between two metal electrodes submerged into a dielectric liquid. We synthesized carbon-encapsulated Fe (Fe@C) magnetic nanoparticles with low cytotoxicity using pulsed plasma in a liquid. Body-centered cubic Fe core nanoparticles showed good crystalline structures with an average size between 20 and 30 nm were encapsulated in onion-like carbon coatings with a thickness of 2–10 nm. Thermal gravimetric analysis showed a high stability of the as-synthesized samples under thermal treatme ...Daha fazlası

Konferans Bildirisi 2018 Mühendislik Fakültesi 2017 International Conference on Aerospace Technology, Communications and Energy Systems (ATCES 2017)302 ( UNSP 012076 ) 94 Görüntülenme
Erişime Açık

Copper Nanoparticles: Synthesis and Biological Activity

Emil ÖMÜRZAK | Tinatin DOOLOTKELDİEVA | Saykal BOBUŞOVA

By means of XRD and FESEM analysis, it is established that copper nanoparticles with sizes less than 10 nm are formed during the chemical reduction, which form aggregates mainly with spherical shape. Presence of gelatin during the chemical reduction of copper induced formation of smaller size distribution nanoparticles than that of nanoparticles synthesized without gelatin and it can be related to formation of protective layer. Synthesized Cu nano-powders have sufficiently high activity against the Erwinia amylovora bacterium, and the bacterial growth inhibition depends on the Cu nanoparticles ...Daha fazlası

Konferans Bildirisi 2018 Mühendislik Fakültesi 2017 International Conference on Aerospace Technology, Communications and Energy Systems (ATCES 2017)302 ( UNSP 012075 ) 187 Görüntülenme
Erişime Açık

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 ...Daha fazlası

Konferans Bildirisi 2020 Mühendislik Fakültesi MATERIALS TODAY-PROCEEDINGS31 ( Part 3 ) 103 Görüntülenme
Erişime Açık

Effect of surfactant materials to nanoparticles formation under pulsed plasma conditions and their antibacterial properties

Emil ÖMÜRZAK | Ruslan ADİL AKAY TEGİN

Pulsed plasma between two Zn rods submerged into aqueous solution of cetyl trimethylammonium bromide (CTAB) and sodium dodecyl sulphate (SDS) surfactants resulted in formation of pure ZnO nanorods, while the pulsed plasma between two Zn rods in water without surfactant yielded a mixture of ZnO and Zn nanoparticles. Carbon coated ZnO nanorods with about 20 nm thickness and 150 nm length were synthesized by this method using different surfactant materials such as CTAB and SDS. Cu nanoparticles of about 10 nm in size were also synthesized by the pulsed plasma in aqueous solution of 0.2 % gelatine ...Daha fazlası

Konferans Bildirisi 2018 Mühendislik Fakültesi Materials Today: Proceedings5 ( 7-3 ) 106 Görüntülenme
Erişime Açık

Synthesis of biologically active silver and copper nanocomposites

Tinatin DOOLOTKELDİEVA | Emil ÖMÜRZAK

In the joint chemical reduction of silver and copper ions in the presence of gelatin, regardless of the composition of the reaction medium, a nanocomposite was formed consisting of nanodispersed silver and copper particles. In this research, the dependence of phase composition and dispersity on the synthesis conditions, as well as antibacterial activity of synthesized silver and copper nanocomposites were studied. It has been established that the most highly dispersed silver and copper nanocomposites were formed in an alkaline medium. We have revealed that nanocomposites of Ag-Cu system which ...Daha fazlası

Makale 2018 Ziraat Fakültesi Materials Research Express5 ( 8 ) 78 Görüntülenme
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