Demir, Mustafa Muammer
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Demir, Mustafa M.
Demir, M
Demir, M.
Demir, M. M.
Demir, M.M.
Demir,M.M.
Demir, Muammer M.
Demir, Mustafa M
Demir, M
Demir, M.
Demir, M. M.
Demir, M.M.
Demir,M.M.
Demir, Muammer M.
Demir, Mustafa M
Job Title
Email Address
mdemir@iyte.edu.tr
Main Affiliation
03.09. Department of Materials Science and Engineering
Status
Current Staff
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Turkish CoHE Profile ID
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WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
2
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3GOOD HEALTH AND WELL-BEING
3
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4QUALITY EDUCATION
3
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
14
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7AFFORDABLE AND CLEAN ENERGY
41
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8DECENT WORK AND ECONOMIC GROWTH
8
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
39
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
2
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
15
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13CLIMATE ACTION
26
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14LIFE BELOW WATER
3
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15LIFE ON LAND
1
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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17PARTNERSHIPS FOR THE GOALS
0
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Documents
131
Citations
4941
h-index
36
Documents
111
Citations
4276
Scholarly Output
169
Articles
116
Views / Downloads
338950/89322
Supervised MSc Theses
27
Supervised PhD Theses
9
WoS Citation Count
3476
Scopus Citation Count
2843
Patents
1
Projects
16
WoS Citations per Publication
20.57
Scopus Citations per Publication
16.82
Open Access Source
123
Supervised Theses
36
| Journal | Count |
|---|---|
| Geothermics | 10 |
| Journal of Physical Chemistry C | 7 |
| Optical Materials | 5 |
| ACS Applied Materials & Interfaces | 5 |
| Macromolecules | 4 |
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Scopus Quartile Distribution
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169 results
Scholarly Output Search Results
Now showing 1 - 10 of 169
Article Citation - WoS: 73Citation - Scopus: 73Toward Transparent Nanocomposites Based on Polystyrene Matrix and Pmma-Grafted Ceo 2 Nanoparticles(American Chemical Society, 2011) Parlak, Onur; Demir, Mustafa MuammerThe association of transparent polymer and nanosized pigment particles offers attractive optical materials for various potential and existing applications. However, the particles embedded into polymers scatter light due to refractive index (RI) mismatch and reduce transparency of the resulting composite material. In this study, optical composites based on polystyrene (PS) matrix and poly(methyl methacrylate) (PMMA)-grafted CeO 2 hybrid particles were prepared. CeO 2 nanoparticles with an average diameter of 18 ± 8 nm were precipitated by treating Ce(NO 3) ·6H 2O with urea in the presence of a polymerizable surfactant, 3-methacyloxypropyltrimethoxy silane. PMMA chains were grafted on the surface of the nanoparticles upon free radical in situ solution polymerization. While blending of unmodified CeO 2 particles with PS resulted in opaque films, the transparency of the composite films was remarkably enhanced when prepared by PMMA-grafted CeO 2 hybrid particles, particularly those having a PMMA thickness of 9 nm. The improvement in transparency is presumably due to the reduction in RI mismatch between CeO 2 particles and the PS matrix when using PMMA chains at the interface.Master Thesis Fabrication and Characterization of Perylene Diimide Doped Polyfluorene Based Solution Processed Blue Organic Light Emitting Diodes(2023) Varlıklı, Canan; Utlu, Sevde Nur; Demir, Mustafa Muammer; Varlıklı, Canan; Demir, Mustafa MuammerBlue is considered as the major component in many applications of organic light emitting diodes (OLEDs). Most of the polymeric blue emitters including poli[9,9-di-(2-diethylhexyl)-fluorenyl-2,7-diyl] (ADS231BE) attract attention with their solubility and potential in reducing the application costs, but also suffer from wide electroluminescence resulting in color purity issues. Annealing temperature and solvent choice have great influence on morphology and electronic properties. A typical OLED is fabricated by using ADS231BE as the emitter material and effect of annealing temperature on EL properties is investigated between 60C and 150C. OLEDs produced using toluene have shown better efficiency compared to those using chlorobenzene. Regardless of the solvent used, the efficiencies gradually decreased, but the stability and color purity of the devices increased with increasing annealing temperatures. Surface morphologies were examined, and suitable coating conditions were determined. Small molecule orange-red-emitting N,N'-bis(2-ethylhexyl)perylene-3,4,9,10-dicarboxylic diimide (PDI) derivatives were introduced into the blue-emitting conjugated polymer ADS231BE at a concentration of 0.1 wt.%. Electroluminescence, morphology, photoluminescence and Raman analysis of the developed devices were completed to determine the type of aggregation and conformational change caused by PDI doping. Subsequently, to balance charge and improve the electroluminescent character of the devices, a hole transfer layer (HTL) consisting of Poly (N-vinyl carbazole) (PVK) and PVK:1,3-Bis(N-carbazolyl) benzene (mCP) was added to the device structure. Similar morphological and Raman analyses were performed. Compared to the bare ADS231BE containing devices, without changing the CIE coordinate values, approximately, 10 folds of luminance and more than 5 folds of EQE increments were obtained.Article Citation - WoS: 39Citation - Scopus: 39Polarized Emission From Cspbbr3 Nanowire Embedded-Electrospun Pu Fibers(IOP Publishing Ltd., 2018) Güner, Tuğrul; Topçu, Gökhan; Savacı, Umut; Genç, Aziz; Sarı, Emre; Demir, Mustafa MuammerInterest in all-inorganic halide perovskites has been increasing dramatically due to their high quantum yield, band gap tunability, and ease of fabrication in compositional and geometric diversity. In this study, we synthesized several hundreds of nanometer long and ∼4 nm thick CsPbBr3 nanowires (NWs). They were then integrated into electrospun polyurethane (PU) fibers to examine the polarization behavior of the composite fiber assembly. Aligned electrospun fibers containing CsPbBr3 NWs showed a remarkable increase in the degree of polarization from 0.17-0.30. This combination of NWs and PU fibers provides a promising composite material for various applications such as optoelectronic devices and solar cells.Article Citation - WoS: 7Citation - Scopus: 10Enhanced Light–matter Interaction in a Hybrid Photonic–plasmonic Cavity(Springer, 2021) Gökbulut, Belkıs; İnanç, Arda; Topçu, Gökhan; Özçelik, Serdar; Demir, Mustafa Muammer; İnci, Mehmet NaciStrongly concentrated optical fields around a metal nanoparticle in the close vicinity of a dipole noticeably facilitate dramatic changes in the localized density of states due to hybrid photonic–plasmonic mode couplings as compared to that of the pure cavity mode fields. Significant variations of the field intensity in the presence of the metal nanoparticle elucidate enhanced light–matter interaction in a hybrid structure. The enhancement factor of the light–matter interaction is studied through the single-atom cooperativity parameter, which is directly proportional to the ratio of the fluorescence lifetimes of the off-resonant and on-resonant emission. A compact and cost-effective hybrid device, which includes a microfiber cavity, supporting whispering gallery modes, and a well-defined solid nanostructure, consisting of a gold nanoparticle core, overcoated by a silica shell, and decorated with CdS/CdSe quantum dots, is demonstrated to offer an outstanding potential for the enhancement of light–matter interaction. Surface plasmons of a gold nanoparticle, placed inside a hollow cylindrical nanostructure at the surface of a microfiber, are activated upon excitation of the dipoles of the quantum emitters, which are on-resonance with the whispering gallery mode. Time-resolved experiments demonstrate that the single-atom cooperativity parameter of the quantum dots is enhanced by a factor of about 4.8 in the presence of the gold nanoparticle being simultaneously in strong interaction with the cavity mode field and the metal nanoparticle’s surface plasmons.Article Citation - WoS: 5Citation - Scopus: 7Effect of High Salinity and Temperature on Water-Volcanic Rock Interaction(Springer, 2021) Gören, Ayşegül Yağmur; Gören, Ayşegül Yağmur; Topçu, Gökhan; Demir, Mustafa Muammer; Demir, Mustafa M.; Baba, Alper; Baba, AlperIn order to understand the processes occurring in natural hydrothermal systems, it was carried out a series of water-volcanic rock interaction studies in the laboratory and an intermediate volcanic rock samples from geothermal production wells in Tuzla geothermal field (TGF) in western Turkey. A high-pressure autoclave was used to conduct water-rock interaction experiments under similar conditions of the field. Rainwater and seawater were treated with volcanic rocks at 140 degrees C (reservoir temperature) and 4.5 bar pressure. The change in the ionic content of the resulting fluids was examined in terms of the type of volcanic rocks and mineral saturation index. The results indicate that talc and diopside minerals in geothermal systems may cause scaling at high temperatures depending on the geothermal fluid and pH.Article Citation - WoS: 42Citation - Scopus: 43Investigation of Oxygen Permeation Through Composites of Pmma and Surface-Modified Zno Nanoparticles(John Wiley and Sons Inc., 2009) Hess, Sandra; Demir, Mustafa Muammer; Yakutkin, Vladimir; Baluschev, Stanislav; Wegner, GerhardOxygen permeabilities of nanocomposite films consisting of poly(methyl methacrylate) (PMMA) and different amounts of spherical zinc oxide (ZnO) nanoparticles were determined to investigate the barrier effect of this material with respect to particle content. A method was applied which is based on quenching of an excited phosphorescent dye by oxygen. Possible effects of the nanoparticles on the response of the dye molecules were investigated and were ruled out.Article Citation - WoS: 49Citation - Scopus: 51Voc Sensors Based on a Metal Oxide Nanofibrous Membrane/Qcm System Prepared by Electrospinning(Royal Society of Chemistry, 2014) Horzum Polat, Nesrin; Taşçıoğlu, Didem; Özbek, Cebrail; Okur, Salih; Demir, Mustafa MuammerWe report a simple synthetic route to fabricate crystalline ZnO and CeO2/ZnO nanofibrous mats and their sensing characteristics against volatile organic compounds (VOCs) such as benzene, propanol, ethanol, and dichloromethane. Precursor fibers were fabricated by electrospinning of poly(vinyl alcohol) and metal salt(s) at 2.5 kV cm-1 in aqueous solution. The fibers were directly deposited on the crystal surface of a quartz crystal microbalance (QCM). The crystal, which was coated by nanostructured PVA/metal precursor(s) fibers, was subjected to calcination in air at 500 °C for 5 h. The formation of an oxide based nanofiber mat was revealed by scanning electron microscopy and X-ray diffraction. Upon exposure of the nanofiber mats to the VOCs, the compounds adsorbed onto the surface of oxidic fibers. The physisorption of the compounds was confirmed by FTIR and QCM. Both systems showed sensitivity to the VOCs and they hold a broad promise particularly for sensing applications of volatile alcoholic compounds. The introduction of CeO2 into the ZnO structure reduced the sensitivity of ZnO most probably due to the decrement of oxygen vacancies.Book Part Citation - Scopus: 5Turmeric Starch: Structure, Functionality, and Applications(Elsevier, 2023) Rasmi, Y.; Demir, Mustafa Muammer; Kırboğa, K.K.; Tekin, B.; Demir, M.For many years, starch has been a subject of never-ending study. It is a relatively affordable substance widely used in food and non-food applications. Fresh rhizomes of Curcuma longa L. and Curcuma caesia extract turmeric starch (Zingiberaceae). Turmeric starch is a common food ingredient used in the thickening of soups and making syrups and other sugars. It is easily modified and finds many uses in industries such as adhesives, paper products, anti-sticking agents, and textile manufacturing. Morphological characteristics such as the shape and size of starch granules vary significantly, and further studies are expected for Turmeric starch, with promising results and increasing the usefulness of starches in industries. This book chapter outlines recent developments in understanding starch isolation, chemical composition, morphology, pasting, rheological and thermal characteristics, and various applications of turmeric starch. Potential applications of oat starches are also reviewed. © 2024 Elsevier Inc. All rights reserved.Master Thesis Development of a New Antiscalant for Minimization of Stibnite Scaling in Geothermal Binary Plants(01. Izmir Institute of Technology, 2021) Karaburun, Emre Mustafa; Baba, Alper; Demir, Mustafa Muammer; Demir, Mustafa Muammer; Baba, AlperDemand for renewable and sustainable energy resources has been increasing in recent years due to the adverse effects of fossil energy resources (gases, oil, coal ect,) on human health and nature. Since geology properties of our country is rich in geothermal energy resources, there is a remarkable increase in plant capacities every year. Geothermal energy is the energy obtained from the fluid, gas, and steam that have been stored in reservoirs by carrying the heat energy accumulated in the rocks in the depths of the earth or surfaced along the discontinuity zones.The increase in the use of geothermal energy and the increase in the capacity of the power plants has also revealed the problem of scaling. The main cause of deposition are the decrease in solubility of minerals by a decrease in pressure and temperature upon pumping the geothermal brine up to the ground. Calcium carbonate, calcium sulphate, metal silicates (Mg, Fe) are the most widely accepted types of scaling. In recent years, antimony and arsenic sulfide scaling have been encountered in volcanic and metamorphic regions. Between these two types of scaling, antimony sulfide is mostly seen in the heat-exchangers and preheaters where the temperature drops suddenly. In this thesis, the antimony sulfide scaling formed in the geothermal power plant was synthesized in an autoclave reactor under specified conditions. Water-soluble polymers nominee for being antiscalants such as Poly (vinyl sulfonic acid), Poly (acrylamide-co-vinyl sulfonic acid), Poly (acrylamide-co-vinyl phosphonic acid), Alginic Acid, Natural antiscalants, Polyacrylic acid, and Polyvinyl alcohol were employed. The results suggest that polymers containing vinyl sulfonic acid and acrylamide likely shows remarkable progress in increasing the concentration of ions in decantate, particularly at low dosages. (≈5 ppm)Article Citation - WoS: 18Citation - Scopus: 46Phosphor-Based White Led by Various Glassy Particles:control Over Luminous Efficiency(The Optical Society, 2019) Yüce, Hürriyet; Güner, Tuğrul; Balcı, Sinan; Demir, Mustafa MuammerGenerating white light through a mainstream remote phosphor design suffers from phosphor conversion efficiency loss due to a backscattering of light. Such a loss also reduces luminous efficiency of the resulting white light. To overcome this issue, various glassy scatterers with different morphologies such as glass bubbles, glass beads, and nanosized silica particles were employed as scatterers, together with a fixed amount of yellow phosphor (YAG:Ce3+) and a poly(dimethylsiloxane) (PDMS) matrix. In addition, the simulation of the system validates the rigorous multiple scattering of the incoming light most probably due to refractive index mismatch between the glass bubbles and surrounding PDMS matrix along with the internal reflections. (C) 2019 Optical Society of America