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Упит dcterms_subject_txt:Sol-gel synthesis

127 items

  • Synthesis, characterization, biomolecular interactions, molecular docking, and in vitro and in vivo anticancer activities of novel ruthenium(III) Schiff base complexes

    Milica Međedović, Aleksandar Mijatović, Rada Baošić, Dejan Lazić, Žiko Milanović, Zoran Marković, Jelena Milovanović, Dragana Arsenijević, Bojana Stojanović, Miloš Arsenijević, Marija Milovanović, Biljana Petrović, Ana Rilak Simović (2023)
    In order to discover new anticancer drugs, novel ruthenium(III) complexes [Ru(L)Cl(H2O)], where L is tetradentate Schiff base bis(acetylacetone)ethylendiimine (acacen, 1), bis(benzoylacetone)ethylendiimine (bzacen, 2), (acetylacetone)(benzoylaceton)ethylendiimine (acacbzacen, 3), bis(acetylacetone)propylendiimine (acacpn, 4), bis(benzoylacetone)propylendiimine (bzacpn, 5) or (acetylacetone)(benzoylaceton)propylendiimine (acacbzacpn, 6), were synthesized. The complexes 1 – 6 were characterized by elemental analysis, molar conductometry, and by various spectroscopic techniques, such as UV–Vis, IR, EPR, and ESI-MS. Based on in vitro DNA/BSA experiments, complexes 2 (bzacen) and 5 (bzacpn) with two aromatic rings showed ...
    Inorganic Chemistry, Biochemistry

  • Influence of Ag doping on the morphological and magnetic properties in CuO nanopowders

    Maria Čebela, Uroš Čakar, Vesna Lojpur, Maja Milošević, Sanja Krstić, Vladimir Dodevski, Milena Rosić (2023)
    ... on the crystal structure and magnetic properties of CuO nanopowders. For the synthesis of nanoparticles of copper-silver oxides solid solutions. with the composition Cu,,Ag,O (x=0.01-0.05), a self- propagating synthesis was applied at room temperature, during which a successful reaction between ...
    ... Institute for Multidisciplinary Research (IMSI!I), University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions "CEXTREME LAB” - Institute of Nuclear Sciences "Vinča”, University ...
    ... Institute for Multidisciplinary Research, University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions “CEXTREME LAB” - Institute of Nuclear Sciences *Vinča”, University of ...

  • BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties

    Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković (2023)
    To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ...
    ferroelectric, dielectric properties, magnetic properties, titanate/ferrite composites, phase composition
    ... 69. 70. 71. Majid, E.;; Rauf, J.; Ata, S.; Bibi, L.; Malik, A.; Ibrahim, S.M.; Ali, A.; Iqbal, M. Synthesis and characterization of NiFe>»Ou ferrite: Sol-gel and hydrothermal synthesis routes effect on magnetic, structural and dielectric characteristics. Mater. Chem. Phys. 2021, 258, 123888 ...
    ... CrossRef] Zhang, C.-Y.; Shen, X.-Q.; Zhou, J.-X.; Jing, M.-X.; Cao, K. Preparation of spinel ferrite NiFe2»Oxu fibres by organic gel-thermal decomposition process. J. Sol-Gel Sci. Techmol. 2007, 42, 95–100. [CrossRet] toh, H.; Takeda, T.; Naka, S. Preparation of nickel and Ni-Zn ferrite films by thermal ...
    ... careful selection of ferrite chemical composition, as well as an attentive choice of synthesis protocol may serve to overcome such negative influence [43-45]. Many different methods were developed for the synthesis of nanocrystalline nickel- and zinc ferrites with tailored characteristics [46e-51] ...

  • Environmental Energy Security Indicators as Tools for Environmental Protection

    Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević (2019)
    Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...
    енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост
    ... proportion that most accurately describes the partial indicator. 3.4 Synthesis of Environmental Acceptability The Environmental acceptability synthesis indicator is more closely defined by three partial indicators. Synthesis of this indicator is related to the composition of Emission of GHG (E1) ...
    ... is energy security. Energy security is a synthesis of the geopolitical and energy aspects of energy availability in various forms in satisfactory quantities and at affordable prices. Energy security as indicator is described with a group of synthesis indicators. It is necessary to continually observe ...
    ... of comfort, is increasingly used in the evaluation of the energy scenario [11]. 3. ENVIRONMENTAL ACCEPTABILITY SYNTHESIS INDICATOR The Environmental acceptability synthesis indicator shows the total contribution to an environmental condition, which can be represented by a group of partial ...

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • Three new Sr-bearing arsenates, hydrothermally synthesized in the system SrO–MO–As2O5–H2O (M2+ = Mg, Cu, Zn)

    Tamara Đorđević, Ljiljana Karanović (2018)
    During systematic research on the mineral-related synthetic arsenates, with particular focus on their structural and spectroscopic classification, three new Sr-containing arsenates Sr2Mg(AsO4)2· 2H2O (1), Sr2Zn4(AsO4)4·H2O (2) and Sr2Cu7(AsO4)6 (3) have been synthesized under low-temperature hydrothermal conditions in the system SrO MO As2O5 H2O (M 2þ = Mg, Zn, Cu). Their crystal structures were determined using room-temperature single-crystal X-ray diffraction data and refined to the following R-values: 1– R1 = 0.025; 2– R1 = 0.030; 3– R1 = 0.035. Compounds ...
    стронцијум, арсен, арсенати, кристална структура, дифракција рендгенских зрака на монокристалима, хидротермална синтеза, Раманска спектроскопија

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • Mechanosynthesis and structural characterization of nanocrystalline Ce1–Y O2– (x=0.1–0.35) solid solutions

    Martin Fabián, Bratislav Antić, Vladimír Girman, Milica Vučinić-Vasić, Aleksandar Kremenović, Shigeru Suzuki, Horst Hahn, Vladimír Šepelák (2015)
    A series of nanostructuredfluorite-type Ce1–xYxO2–δ (0rxr0.35) solid solutions, prepared via highenergy milling of the CeO2/Y2O3mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For thefirst time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1–xYxO2–δ, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria ...
    Ceria, Yttrium, Solid solution, Mechanosynthesis, Oxygen vacancy, Nanocrystalline material

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • Photocatalytic Activity of the V2O5 Catalyst toward Selected Pharmaceuticals and Their Mixture: Influence of the Molecular Structure on the Efficiency of the Process

    Sanja J. Armaković, Aleksandra Jovanoski Kostić, Andrijana Bilić, Maria M. Savanović, Nataša Tomić, Aleksandar Kremenović, Maja Šćepanović, Mirjana Grujić-Brojčin, Jovana Ćirković, Stevan Armaković (2023)
    Due to the inability of conventional wastewater treatment procedures to remove organic pharmaceutical pollutants, active pharmaceutical components remain in wastewater and even reach tap water. In terms of pharmaceutical pollutants, the scientific community focuses on -blockers due to their extensive (over)usage and moderately high solubility. In this study, the photocatalytic activity of V2O5 was investigated through the degradation of nadolol (NAD), pindolol (PIN), metoprolol (MET), and their mixture under ultraviolet (UV) irradiation in water. For the preparation of V2O5, facile ...
    DFT analysis, metoprolol, nadolol, nanomaterial characterization, photocatalysis, pindolol, β-blocker
    ... ts used are nanocrystalline M-type hexaferrite Cao.sPbo.s-xYbxZnyFeiy.yO u synthesized by sol-gel autocombustion method [15], the CaNax / AgSOy Co y „Biy.yOz synthesized by the combination of sol-gel and annealing; approaches [14], porous methacrylic organosilica materials (AgPMOS) synthesized ...
    ... pindolol (PIN), metoprolol (MET), and their mixture under ultraviolet (UV) irradiation in water. For the preparation of V»Os, facile hydrothermal synthesis was used. The structural, morphological, and surface properties and purity of synthesized V»Os powder were investigated by scanning, electron microscopy ...
    ... served as a starting, point for this research. Table 1. Some previous research on the photocatalytic activity of V)Os toward organic pollutants. Synthesis Method Compounds Irradiation Efficiency Reference Hydrothermal method After 180 min degradation of VOs pure vanadium žžl:hšlrzl;?cgš)(MO) Visible ...

  • Crystal structure of K3EuSi2O7

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu
    ... crystal using a JEOL JSM-6610LV instrument equipped with an Oxford INCA Energy 350 EDS detector. Synthesis and crystallization The following chemicals were used in the high-temperature flux synthesis experiment: Eu2O3 (Sigma-Aldrich, 99.99 %), SiO2 (Merck, p.a.) and KF (Centrohem, 99 %). A total ...
    ... distorted octahedral and an ideal trigonal prismatic coordination environment. Keywords: alkali rare-earth silicates; crystal structure; flux synthesis; single- crystal X-ray diffraction. INTRODUCTION Silicates containing rare-earth elements (REE silicates) are the subject of intense research ...
    ... KOVAČ et al. K3ScSi2O7, 14 K3YSi2O7 (2 polymorphs),6 K3SmSi2O7, 7 K3ErSi2O7 (2 polymor- phs).15 During our investigations focused on the synthesis of new potassium-REE silicates, single crystals of K3EuSi2O7 were obtained. K3EuSi2O7 crystallizes in the hexagonal space group P63/mcm (No. 193) ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... composition is often used in fuzzy algebra as a synthesis model [18,21–24]. Synthesis is performed on two levels. In the first, parameters A1, A2, A3 are synthesized in A, respectively B1 to B6 in B, and C1 to C5 in C. At the second level of synthesis, A, B and C parameters are synthesized into the ...
    ... With the increase in water in the production fluid, methods that can produce larger quantities of fluid are more widely used. 3.2. Synthesis Part of the Model The synthesis of partial indicators (A, B, C) into one (M) is performed by fuzzy composition, which is a model that provides the structure of ...
    ... order to form the optimization model, it is necessary to reduce the indicated parameters to the same form in the analytical sense and to find a synthesis model. 3. Development of a Conceptual Model for the Selection of an Artificial Lift Parameters that define the optimal method are considered in ...

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... Fuzzy-AHP synthesis model is represented through the fuzzy inference model where inputs are represented with fuzzificated estimates of partial indicators, and the rules of fuzzy composition are defined through outcomes that are corrected on the basis of ranks. 2.2.1. Fuzzy Inference in the Synthesis Model ...
    ... not possible to plan activities in the context of time and organization. The second step in the formation of the synthesis model is the composition of partial parameters to the synthesis level. Basically, the composition in the fuzzy theory is represented by the ‘IF-THEN’ rule. In concrete cases, derived ...
    ... The max–min composition was used, where the outcomes were defined as the mean value. In reference [14], the fuzzy theory was also used for the synthesis of available parameters, but reliability and the convenience of maintenance are presented on the basis of probability theory. Therefore, the concept ...

  • A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers

    Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić (2019)
    Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...
    Efikasnost, Fazi zaključivanje, Prikupljanje podataka, Buldozer

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... assessment of partial indicators of element failure; • A risk level synthesis assessment of element failure; • A hierarchical synthesis of risk assessments for the technical system. A risk level assessment of subsystem failure is a synthesis assessment based on a risk assessment of elements using min–max ...
    ... ���������� ������� Abstract: The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical ...
    ... 2020 updates Abstract: The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical ...

  • Polymorphism and photoluminescence properties of K3ErSi2O7

    Predrag Dabić, Marko G. Nikolić, Sabina Kovač, Aleksandar Kremenović (2019)
    alkalni silikati elemenata retkih zemalja, silikati lantanoida, polimorfizam, fotoluminescencija, kristalna struktura

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... Germany. 2.1. Synthesis of the Samples Synthesis of activated carbon materials was performed in two steps. At first, required amounts of glucose (G) and fructose (F) were dissolved in deionized water in order to prepare solutions with a concentration of 1.0 mol/dm3. Hydrothermal synthesis was carried ...
    ... Cataldo, S.; Muratore, N.; Orecchio, S. Enhancement of adsorption ability of calcium alginate gel beads towards Pd(II) ion. A kinetic and equilibrium study on hybrid Laponite and Montmorillonite-alginate gel beads. Appl. Clay Sci. 2015, 118, 162–170. [CrossRef] 22. Babel, S.; Kurniawan, T.A. Low-cost ...
    ... different preparing conditions and perform detailed characterization as well. In the presented paper, activated carbons were prepared by hydrothermal synthesis from easily accessible, eco-friendly and low-cost materials (glucose and fructose) and activated with different hydroxides in order to get the best ...

  • Оцјена водопропусности понорске зоне Шуковићу (Цернићко поље) помоћу Лижоновог теста

    Петар Војновић, Саша Милановић, Љиљана Васић (2022)
    One of the specificities of reservoirs forming in highly karstified terrains is reflected in the wide range of unknowns, specifically during reservoir formation, filling and operation. Unfortunately, despite complex research, many reservoirs constructed in karst terrains have problems with water losses from the reservoir to other aquifers due to ponor and ponor zones which are a common in the karst of Eastern Herzegovina. One of such zones is Šuković ponor located in the southern part of the Cerničko polje ...
    карст, Шуковића понор, Церничко поље, водопропусност, Лижонов тест

  • Available technological procedures for capturing CO2 in the industrial and power generation sectors

    Lola Tomić, Vesna Karović Maričić, Dušan Danilović, Branko Leković, Miroslav Crnogorac (2021)
    Climate change is a major environmental issue caused by anthropogenic emissions of greenhouse gases. Capturing CO2 and storing it in suitable geological formations is one of the main technological solutions that can provide mitigation of CO2 emission into the atmosphere. Capturing CO2 represents the first phase in process of carbon capture and storage, and includes the application of various technologies for the separation of CO2 produced in the energy and industrial sectors. There are four main systems for capturing ...
    capturing CO2, power plants, CO2 capture systems, CO2 technologies
    ... is completed. In this process, fuel is gasified to produce a gas mainly composed of carbon monoxide (CO) and hydrogen (H2), which is known as a synthesis gas or syngas. The produced syngas is mixed with steam in a catalytic reactor, which promote reaction between CO and water, producing hydrogen and ...
    ... gasification combined cycle power plant (IGCC) [8]. Compared to post-combustion system, the gasification process is operated at the high pressure and synthesis gas contains higher concentration of CO2 (15-60%) [18], that makes separation easier before the H2 is combusted [12]. Because of more concentrated ...
    ... increase of pressure and decrease of temperature. This procedure has many applications such as: in natural gas processing, in separation of CO2 from synthesis gas which is used in the production of hydrogen, ammonia, and methanol [21-22]. There are a number of physical absorption processes with different ...