Balköse, Devrim
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Balkose, Emetullah Gulsum Devrim
Balköse, Emetullah Gülsüm Devrim
Balköse, E.Gülsüm Devrim
Balkose, D
Balkose, D.
Balköse, D
Balköse, D.
Balkose, Devrim
Balköse, Emetullah Gülsüm Devrim
Balköse, E.Gülsüm Devrim
Balkose, D
Balkose, D.
Balköse, D
Balköse, D.
Balkose, Devrim
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03.02. Department of Chemical Engineering
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1NO POVERTY
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2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
8
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7AFFORDABLE AND CLEAN ENERGY
9
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
13
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10REDUCED INEQUALITIES
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11SUSTAINABLE CITIES AND COMMUNITIES
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
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13CLIMATE ACTION
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14LIFE BELOW WATER
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2976
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100
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66
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7
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3
WoS Citation Count
2279
Scopus Citation Count
2537
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1
WoS Citations per Publication
22.79
Scopus Citations per Publication
25.37
Open Access Source
80
Supervised Theses
10
| Journal | Count |
|---|---|
| Journal of Thermal Analysis and Calorimetry | 11 |
| Journal of Applied Polymer Science | 9 |
| Polymer Degradation and Stability | 5 |
| Industrial and Engineering Chemistry Research | 5 |
| Drying Technology | 5 |
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Doctoral Thesis Dna Adsorption on Silica, Alumina and Hydroxyapatite and Imaging of Dna by Atomic Force Microscopy(Izmir Institute of Technology, 2013) Yetgin, Senem; Balköse, Devrim; Balköse, DevrimThe scope of the study is to investigate calf thymus DNA adsorption process on solid powders such as silica, alumina and hydroxyapatite (HAP) to improve DNA solid phase extraction efficiency and to visiulize DNA adsorption by atomic force microscopy (AFM). The equilibrium and kinetics of the DNA adsorption were investigated in batch adsorption on a commercial silica gel and a synthesized silica aerogel, commercial alumina and HAP powders from aqueous DNA solution. Commercial DNA extraction kit adsorbents were also characterized and used for adsorption. Adsorbed DNA was imaged in ambient air on flat surfaces of mica, silica and alumina wafers and HAP particles coated glass surfaces and a HAP pellet surface by AFM. Effects of ambient air, nitrogen flow and freeze drying methods on DNA morphology on the releted surfaces were also investigated. Adsorption of DNA on silica, alumina and HAP increased with the decrease of pH from 9.0 to 2.0. Enhancements of the adsorption capacities of adsorbents were obtained with the addition of MgCl2. It was found that the Van der Waals and the hydrogen bonds rather than the surface charge were the cause of the adsorption. The adsorption isotherms of DNA on silica, alumina and HAP were fitted to Langmuir model in pH range 2-9. The adsorption kinetics obeyed pseudo second order model. The sharpest image of DNA by AFM was obtained by freeze drying method on alumina surface. Dispersed DNA in water was adsorbed on the surfaces not as single molecules but as supercoils consisting of many molecules.Master Thesis Preparation and Characterization of Metal Soap Nanofilms(Izmir Institute of Technology, 2005) Öztürk, Serdar; Balköse, Devrim; Balköse, DevrimIn this study, the production of metal (zinc and calcium) stearate nanofilms by Langmuir-Blodgett (LB) film deposition process and their structural and electrical characterizations were investigated. The interaction of stearic acid monolayer with calcium, zinc cations as functions of pH, temperature, concentration of metal cation in the subphase and barrier speed was examined in detail. The effects of transfer surface pressure, the dipping speed, drying period, pH, concentration of metal cations in the subphase and temperature in the deposition of metal stearates onto glass substrates were optimized. Metal stearate LB films were prepared and characterized by X Ray Diffraction technique. It was revealed that the zinc stearate arrangement may be identified as under the orthorhombic (R) subcell with chain tilt angle of 31o, which was confirmed by IRspectrum of zinc stearate. Atomic Force Microscopy and Scanning Electron Microscopy images showed that surface roughness on glass substrates was decreased by firstly chrome coating and then silver coating. Zinc stearate coated surfaces have large crystal size around 90 nm in agreement with XRD calculation and contained grains and defects.The results of LB film deposition processes, structural characterization of LB films and the water vapour adsorption experiments presented that ZnSt2 LB films were easily formed and have good ordered structure in comparison to CaSt2 LB films. Therefore ZnSt2 LB films were chosen to study humidity sensor characteristics. Conductivity of ZnSt2 LB films was easily affected from environmentalconditions. No hysteresis during adsorption and desorption of water vapor on conductivity-voltage measurements was observed for zinc stearate LB film.As a result, zinc stearate LB films can be used as humidity sensor. By measuring conductivity in an humid atmosphere, humidity could be determined.Article Citation - WoS: 30Citation - Scopus: 31Water and Water Vapor Sorption Studies in Polypropylene-Zeolite Composites(Wiley, 2003) Pehlivan, Hilal; Özmıhçı, Filiz; Tıhmınlıoğlu, Funda; Balköse, Devrim; Ülkü, SemraWater and water vapor sorption to porous polypropylene-zeolite composites prepared by hot pressing have been studied as a function of zeolite loading. This work presents the first report on the effect of the zeolite as a filler on the water-sorption properties of PP composites. Water swelling experiments were conducted at 25°C using pure PP and PP-zeolite films samples having different zeolite loadings (6-40 wt %). Because PP is a hydrophobic polymer, it does not sorp any water, but the composites having 10, 20, 30, and 40% zeolites have sorbed 0.63, 1.00, 1.72 and 3.74% water, respectively. The zeolite itself at the same conditions sorbed 24.5% water. As the filler loading in the composites increased, equilibrium uptake values increased also. On the other hand, water vapor sorption and kinetics has been studied using a Cahn 2000 gravimetric sorption system. Within in the range of 0.35-0.95% water vapor was adsorbed by the composites containing 10-40 wt % zeolites. Experimental effective water vapor diffusivities of the composite films was about one order of magnitude higher (10-fold) than the experimental water diffusion coefficient in composites. The transport of water in composites was slower than that in the liquid water due to the longer diffusion pathway and adsorption on the surface of the composites. Although the liquid water may fill all the voids in the composite, water vapor is adsorbed on the surface of the zeolite only.Article Lubricants Having Zinc Borate by Homogeneous Precipitation and Span 60 in Spindle Oil(Turkish Energy Nuclear and Mining Research Institute, 2021) Gönen, Mehmet; Alp, Burcu; Savrık, Sevdiye; Balköse, Devrim; Alp, Fatma Burcu; Balkose, DevrimNano particles of zinc borate were obtained by homogeneous precipitation method which is based on dissolving zinc borate in ammonia and precipitating it as nano particles by slow evaporation of ammonia. The synthesized zinc borates were characterized by advanced analytical techniques. Zinc borate nano particles were used as a lubricant additive to spindle oil having Span 60 dispersant. The particles were well dispersed in spindle oil as shown by optical microscopy of the oils. Four ball tests of the lubricants indicated zinc borate lowered (61.8%) the wear scar diameter significantly. The hardness of wear surfaces of test balls was reduced from 688 HV to 618 HV and presence of zinc borate particles embedded on the surface indicated a flexible skin was formed. Therefore the pressure was decreased due to increase of the contact area of the balls. The surface roughness was also decreased from 35.63 nm to 27.60 nm by the addition of zinc borate to spindle oil having Span 60. Zinc borate prepared by homogeneous precipitation technique lowered the wear of the surfaces that rub to each other.Book Part Citation - Scopus: 1Metal Soap Greases(Apple Academic Press, 2013) Arkı, Esen; Balköse, DevrimMetal soaps are transition metal salts of the fatty acids and the alkaline earth. Although, the alkali salts of the fatty acids such as sodium and potassium are water soluble, metal soap is water insoluble but more soluble in nonpolar organic solvents [1]. Some commercially important metal soap include those of Alluminum, barium, cadmium, calcium, cobalt, copper, iron, lead, lithium, magnesium, manganese, potassium, nickel, zinc, and zirconium. Significant application areas for metal soaps include lubricants and heat stabilizers in plastics as well as driers in paint, varnishes, and printing inks. Other uses are as processing aids in rubber, fuel and lubricant additives, catalysts, gel thickeners, emulsifiers, water repellents, and fungicides [2]. © 2013 by Apple Academic Press, Inc.Article Citation - WoS: 8Citation - Scopus: 8Methods of Humidity Determination Part I: Hygrometry(Springer Verlag, 2008) Rübner, Katrin; Balköse, Devrim; Robens, E.Part I of the short survey covers definitions of air humidity and the respective measuring methods such as hygrometry, psychrometry, dew point measurement, LIDAR hygrometry and humidity sensors. Techniques based on property changes of matter with adsorbed moisture from air are reviewed.Book Citation - Scopus: 1Physics and Mechanics of New Materials: Synthesis, Processing, and Emerging Applications(Apple Academic Press, 2024) Balkose, D.; Ribeiro, A.C.F.; Kalarikkal, N.; Abraham, A.R.; Haghi, A.K.This new volume covers new advances in materials science and engineering technology, focusing on practical rather than theoretical aspects that are useful for the design, fabrication, testing, and industrial application of advanced materials and structures. The first section of this book delivers a comprehensive overview of modern ferrites with special attention to their structure, types, and properties. It presents a comprehensive survey on ferrite materials with discussions of selected applications of modern ferrite materials in emerging technologies. In the second section, the impact of technological change upon the application of selected materials and energy resources are presented in detail. This includes discussions on 2D nanomaterials, bismuth ferrite, and barium titanate and how these can be put to practical use. In the last section of this volume, case studies in thermophysics and applied mechanics for engineering technology are presented that provide an examination of the various physical, chemical, and material properties of a range of modern materials. This research-oriented book, Physics and Mechanics of New Materials: Synthesis, Processing, and Emerging Applications, is an essential reference source intended for scientific researchers, faculty, and postgraduate and senior students who specialize in the field of materials science and applied mechanics of materials. © 2025 by Apple Academic Press, Inc.Article Citation - WoS: 2Citation - Scopus: 2A Study of Chemical and Physical Changes During Biaxially Oriented Polypropylene Film Production(Walter de Gruyter GmbH, 2003) Ülkü, Semra; Balköse, Devrim; Arkış, Esen; Sipahioğlu, MuzafferPolypropylene films obtained during the biaxial orientation process were characterized by energy dispersive X-ray analysis (EDX), scanning electron microscopy. X-ray diffraction, differential scanning calorimetry, infrared spectroscopy. Inorganic particles with Al, Si, Na, Mg, Ti, K,O elements were present in biaxially oriented films. Polypropylene had molecules with both isotactic configuration and it was crystallized only in isotactic α phase. The films drawn in one and two directions had unit cells with b axis parallel to surface of the films. The antioxidants present in the films were consumed during processing, preventing polypropylene oxidation in air at high processing temperatures. One surface of the films contained less polypropylene and had functional groups rich in oxygen such as C=O and COO.Article Citation - WoS: 56Citation - Scopus: 66Effect of Zinc Soaps of Rubber Seed Oil (rso) And/Or Epoxidised Rubber Seed Oil (erso) on the Thermal Stability of Pvc Plastigels(Elsevier Ltd., 2007) Egbuchunam, Theresa Obuajulu; Balköse, Devrim; Okieimen, Felix EbhodagheZinc soaps of rubber seed oil (RSO) and epoxidised rubber seed oil (ERSO) were prepared and their use as PVC stabilizers investigated. Characterization of Zn soaps of RSO prepared by different techniques and ERSO gave information on the purity, structure and thermal behaviour of these materials. From the analysis, the production of these materials for use in thermal stabilization of PVC would be optimized as their use greatly enhanced the stability of PVC as obtained from the conductivity measurements using the 763 PVC Thermomat. The minimum amount of HCl release was obtained for the samples with Zn soaps and ERSO indicating a synergistic effect. Zn soaps having Zn(OH)2 stabilized PVC better than pure Zn soaps.Article Citation - WoS: 5Citation - Scopus: 6Use, Preparation, and Characterization of Copper-Containing Silica Gel(American Chemical Society, 2020) Ulutan, Sevgi; Tüzüm Demir, Ayşe Pınar; Balköse, DevrimThe preparation and characterization of humidity-indicating silica gel containing copper sulfate were aimed at in the present study. The equilibrium and kinetics of Cu(II) sorption were investigated by contacting 200-1600 mg dm(-3) Cu ion-containing solutions with silica hydrogel slabs having 10% silica. The diffusion coefficient of Cu(II) in silica hydrogel was determined to be on the order of 10(-10) m(2) s(-1). X-ray diffraction indicated that the gels contained mainly CuSO4 center dot 3H(2)O, CuSO4 center dot H2O, and small amounts of CuSO4 and CuSiO3 center dot 2H(2)O. The silica gel with Cu(II) can be used as a humidity indicator since its color changes from light blue to dark blue upon moisture adsorption.