Esra Alveroglu

Esra Alveroglu
Istanbul Technical University · Department of Physics Engineering

Professor

About

46
Publications
4,306
Reads
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418
Citations
Citations since 2016
26 Research Items
332 Citations
20162017201820192020202120220204060
20162017201820192020202120220204060
20162017201820192020202120220204060
20162017201820192020202120220204060

Publications

Publications (46)
Article
Full-text available
Present study reports the hydrothermal synthesis procedure to prepare the facile and sustainable orthorhombic Molybdenum trioxide (α-MoO3) nanoparticles (NPs) for the degradation of thymol blue dye. Synthesized α-MoO3NPs was characterized by FTIR, XRD, Zeta-potential, SEM, and TEM to investigate the functionalities, texture, size, and morphology of...
Patent
Full-text available
This electrical conductive surgical suture can be used in suturing ruptured nerves, in spinal surgery, or this method can be used in neurologic implants and nerve stimulating biomaterials.
Article
Full-text available
In this study, highly efficient Fe/Bi bimetallic magnetic nanooxides (IBBMNOs) were used as adsorbent for the removal of Cr(VI) from an aqueous environment. The IBBMNOs were synthesized by a simple and facile chemical reduction method. After that, different analytical techniques were used to characterize the resultant nanomaterial. According to cha...
Article
Full-text available
The present study describes a new approach for the lead (II)-imprinted interpenetrating polymer linkage synthesis by ion-imprinted polymers. The development of lead (II) (Pb²⁺⁾ ion-imprinted polymer by employing the 4-vinyl pyridine as a complexing agent and methacrylic acid as a functional monomer was used for the selective elimination of noxious...
Article
Full-text available
This work highlights a new facile method for preparing Cobalt (Co²⁺) Imprinted Polymer, Prepared by the co-precipitation process. 4-vinyl pyridine (4VP) used as a complexing material 2-(Hydroxyethyl) methacrylate (2HEMA) used as a functional monomer. The Co²⁺ tagged imprinted polymer was crosslinked by the ethylene glycol methacrylate. Simultaneous...
Article
Highly efficient colorimetric povidone (PVP) mediated Ag nanosensing strategy has been adopted for the sensitive and selective quantification of cobalt ion in aqueous system. PVP functionalized Ag nanoparticles grown by chemo-reductive methodology at ambient conditions. These efficient nanoparticles were confirmed by UV–Vis (UV–Vis) spectroscopic c...
Article
Efficient nanocatalyst with incredible performance is highly demanding in a heterogeneous catalysis system. Herein, we report the facile fabrication of uniform and highly stable Cerium Oxide nanoparticles (CeO2 NPs), through chemical precipitation method using sodium hydroxide as reducing agent. The synthesized material is characterized through hig...
Article
Current paper reports the fabrication of an exceptional and cost-effective electrochemical nanosensor for the ultra-sensitive determination of Hydroquinone (HQ) using MoO3 nanostructures. The characterization through versatile analytical techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-ray dif...
Article
Full-text available
A new nickel ion, magnetic imprinted polymer was fabricated through the precipitation polymerization process, using amine-functionalized silica-capped iron oxide particles as a core material, and 4-vinyl pyridine as complexing agent methacrylic acid as functional monomer. The resulted magnetic adsorbent was employed to eliminate toxic Ni2+ ions fro...
Article
The activation of dispenser cathodes while heating up to their brightness temperatures is a highly nonlinear and specific process. Since the cathode surface temperature is a crucial factor, controlling it and determining the physical and chemical factors affecting this parameter gives the opportunity to design dispenser cathodes more efficiently. B...
Article
In the present study, we report the synthesis of selective magnetite molecular imprinted polymer (Fe3O4@SiO2@NH2-Que-MIP) for the first time by a simple ultrasonic mediated co-precipitation polymerization route and applied as a sorbent for selective extraction of quercetin from onion samples. The ultrasonic energy is not only a green source of ener...
Article
Full-text available
In this study, we report a simple and economic one-pot synthesis of magnetite (Fe3O4) nanostructure and its modification with tetraethyl orthosilicate by coprecipitation method. The synthesized (Fe3O4@SiO2) nano sorbent was applied for enhanced adsorptive removal of methylene blue by ultrasonic wave driven batch experiments. After successful synthe...
Article
In the proposed research, novel Cr-(VI) imprinted, magnetic polymer MIIP decorated on the surface of amine functionalized silica caped magnetite nanoparticles, for the selective and efficient remediation of hexavalent chromium ion from aqueous system has been disclosed. The simple and facile coprecipitation profile was used for the fabrication of a...
Article
In this study, we report the synthesis of arsenic-imprinted polymer (As-IIP) through the combined effect of dual functional monomers, 4-vinyl pyridine, and methacrylic acid based ionic interaction by a simple and cost-effective ultrasonic-mediated precipitation polymerization. Ultrasonic energy application reduces the reaction time as compared to c...
Article
This article describes the preparation of Fe3O4 nanoparticles and its decoration with a layer of tiny Ag nanoparticles at room temperature. Later on, the synthesized Fe3O4@Ag heterostructures were protected with Silica and finally modified with Poly(N-isopropyl acrylamide) (PNIPA) nanogels through post-synthesis method to get multifunctional (super...
Article
Herein, a fluorescence sensor based on the fluorescence quenching phenomena was developed by the functionalization of Pyranine molecules over the surface of carbon nanotubes (Pry-CNTs) for quick, selective and sensitive detection of Fe³⁺ ion. The change in the emission along with the Fluorescence Quenching response was found linearly comparative to...
Article
Tuning the adsorption and desorption rate constant of proteins is a hot topic for broad range of applications in biotechnology and medical science; especially controlled drug delivery and protein separation are the prominent examples in this field. In this study, Gel-MNPs (Poly(N-isopropylacrylamid) PNIPA-Magnetic Nano Particles) composites were sy...
Article
In this study, a sensitive fluorescence sensor was synthesized for the detection of Cu²⁺ ions based on the quenching of fluorophore. The sensor is composed of pyranine functionalized amino silane shell modified magnetite (Fe3O4) core nanostructures. The synthesized nanomaterials were characterized by Fourier Transform Infrared Spectroscopy (FTIR),...
Article
This study describes a very sensitive fluorescence sensor for the selective nanomolar detection of Ni⁺² ions. The Ni⁺² ions sensing is based on fluorescence quenching of the fluorophore (fluorescein) in neutral aqueous medium. The fluorescence sensor is composed of magnetic core and amino silica shell, functionalized with fluorescein fluorophore. T...
Article
In this study, differently coated superparamagnetic Fe3O4 (magnetite) nanoparticles were synthesized, characterized and used for lysozyme (Ly) and bovine serum albumin (BSA) adsorption. SiO2, carbon nanotubes (CNTs) and graphene were used for covering the readily synthesized magnetite nanoparticles to elucidate the effect of cover layer on the prot...
Article
Herein, we synthesized and characterized fluorescent and super paramagnetic [email protected]3O4 nanospheres. First, (3-mercaptopropyl) trimethoxysilane (MPS) capped ZnS quantum dots (QDs) and SiO2 coated Fe3O4 nanoparticles were synthesized separately by using solution growth and co-precipitation techniques. After synthesis and characterization of...
Article
In this study, polyacrylamide (PAAm) hydrogel covered CoNi magnetic nanoalloys with various Co/Ni molar ratio (from 1/4 to 4/1) were synthesized, characterized and used for adsorption of Bovine Serum Albumin (BSA). XRD, EDS, VSM, SEM, AFM, Automated Gas Sorption Analyzer and Fluorescence measurements were used for characterizations and adsorption s...
Article
Herein, we report the fabrication and characterization of Camphor Sulfonic Acid (CSA) doped Poly(3-hexylthiophene) (P3HT) nanofilms prepared at different substrate temperature on glass by simple wire bar coating method. Spectroscopic, optic, structural and electrical properties of the prepared nanofilms were characterized by atomic force microscopy...
Article
Full-text available
The effect of washing with acidic and basic solutions on the internal structure (fluctuations in the density and the size of the polymer clusters through the gel) of the imprinted and the random PNIPA (polyN-isopropylacrylamide) hydrogels has been studied by using steady-state fluorescence technique, swelling kinetics and SEM images. When the gel i...
Article
In this study, Fe3O4 Nanorods-PNIPA Nanogels Composite nano material is synthesized, characterized and used for lysozyme adsorption. XRD, ATR-FTIR, AFM and SEM measurements reveal that nanorods-nanogels composite was prepared successfully. The diameter of nanorods and the average particle size of nanogels are found around 150 nm and 300 nm, respect...
Article
Full-text available
Varying size fluorescent N-isopropylacrylamide (NIPAM) nanogels were synthesized from 140 to 550 nm by precipitation copolymerization. N,N-methylenebisacrylamide (BIS) and ammonium persulfate APS were used as cross-linker and initiator, respectively. 8-Hydroxypyrene-1,3,6-trisulfonic Acid (Pyranine, Py) molecules were used for controlling the parti...
Article
In this study, poly(N-isopropylacrylamide-co-N-vinylcarbazole) gels were prepared and characterized with Fourier Transform Infrared Spectroscopy, Photoluminescence Spectroscopy, Scanning Electron Microscopy, Differential Scanning Calorimetry and DC conductivity methods. The synthesis and characterization results showed that the presence of NVCz moi...
Article
The work have been undertaken in this study is to synthesis and characterize Fe3O4–polymer nanocomposites which are having different morphological properties. Also, investigation of the adsorption and desorption behaviour of lysozyme onto Fe3O4–polymer nanocomposites have been studied. Fe3O4 nanoparticles, synthesized by in situ in polyacrylamide h...
Article
We demonstrated that how dodecyl benzene sulphonic acid (DBSA) as a small-molecular dopant, affects the spectroscopic, electronic and structural properties of poly(3-hexylthiophene) (P3HT). The DBSA volume ratio was varied from 0.001 μL to 30 μL per 1 mL P3HT solvent in p-xylene. DBSA doping reaction was confirmed by the emerging huge absorption pe...
Article
Full-text available
In this study, we synthesised ZnS nanocrystals and embedded them in polyacrylamide (PAAm) hydrogel to stabilise the fluorescence emission for biomedical applications. ZnS nanoparticles have strong emission but they lose it in time, so generally they are capped with polymers. We capped ZnS nanoparticles with (3-mercaptopropyl)-trimethoxysilane (MPS)...
Article
Three different designs for p–n junctions were formed with p-and n-type polyacrylamide hydrogels (PAAm) doped with positive (Na+) and negative (Br−) ions as charge carriers. First, previously synthesized p-and n-type gels in slab forms were contacted physically with together. Second, having synthesized p-type gel, n-type pregel solution was poured...
Chapter
Introduction Experimental Methods Polymerization and Gelation Kinetics Sol–Gel Transition and Universality Discussion Imprinting the Gels Heterogeneity of Hydrogels Ionic p-Type and n-Type Semiconducting Gels Conclusions References
Article
This study investigates synthesis and characterization of polyacrylamide (PAAm) hydrogels containing ferromagnetic CoFe2O4 nanoparticles. Structural, electrical, and magnetic characterization of the gels have been performed with X-ray powder diffractometry, Scanning electron microscopy, DC conductivity, magnetization and fluorescence spectroscopy t...
Article
The preparation and characterization (structural, morphological, and optical) of ZnO nanoparticles were studied for different reaction conditions (stirring velocities, temperatures, concentrations of reactants and capping). The wet chemistry route was used to produce the nanosized particles. X-ray Diffraction (XRD), Transmission Electron Microscopy...
Article
This study investigates synthesis and characterization of polyacrylamide (PAAm) hydrogels containing magnetic NiFe2O4 nanoparticles. Structural, electrical, and magnetic characterization of the gels have been performed with X-ray powder diffractometry, scanning electron microscopy, DC conductivity, magnetization and fluorescence spectroscopy techni...
Article
The internal structure of polyacrylamide gels consists of polymer-dense regions with different densities, which are denoted as "blobs". The density difference between these blobs decreases when a gel is doped with charged molecules. When a small potential is applied between the ends of such a gel, ionic charge carriers result in a current. A theore...
Article
Polyacrylamide (PAAm)-Cobalt(II)acetate (Co) composite materials were synthesized with and without pyranine (8-hydroxypyrene-1, 3,6-trisulfonic acid, trisodium salt; POH) anionic fluoroprobe having a reactive group, OH, and three ionic groups, SO, as peripheral. Magnetization and fluorescence measurements showed that addition of POH molecules into...
Article
Full-text available
In this study, we synthesized the new kinds of semiconducting polymeric gels having negative (n-type) and positive (p-type) counter ions as charge carriers. The polyacrylamide gel was doped with pyranine (8-hydroxypyrene-1,3,6-trisulfonic acid, trisodium salt), having SO(3)(-) ions as side groups and Na(+) as counter ions, so-called p-type semicond...
Article
Poly(acrylamide-co-N,N′-methylenebisacrylamide) gels were synthesized in the presence of pyranine fluoroprobe (trisodium 8-hydroxypyrene-1,3,6-trisulfonate). Pyranine binds to polymer chains through its OH group via radical addition. Thus, the final gels were doped with the pyranines having SO ions as side groups and Na+ as counter-ions. The swelli...
Article
Full-text available
Co-doped plain gels (PAAm) were prepared with and without pyranine fluoroprobe (8-hydroxypyrene-1, 3,6-trisulfonic acid, trisodium salt; POH), which have a OH- reactive group and three SO-3 ionic groups. Magnetization and fluorescence measurements were used for characterization of the gels. It was observed that both the plain gel itself and the gel...
Article
Real-time fluorescence measurements have been developed for measuring the fractal dimension d_{f} and critical exponents gamma and beta simultaneously during the sol-gel transition of acrylamide bisacrylamide cross-linking copolymerization. We observed that d_{f} passes through a minimum value of approximately 2.5 at a critical time t_{c} and cross...
Article
Magnetization and resistivity measurements have been carried out on the Heusler alloy Pd2 YbPb in the temperature range 2–300 K. Both low-field dc susceptibility and resistivity show that this material undergoes a superconducting transition at 2.85 K. The presence of superconductivity was also confirmed by the Meissner effect observed at temperatur...
Article
The magnetic behavior of ErCo2 at low fields has been investigated over the temperature range extending from 4 to 300 K. Magnetic hysteresis loops, at 4.2 K between the fields of ∓1.5 kOe, have been recorded for both zero field-cooled (ZFC) and field-cooled (FC) cases. Strong thermo-magnetic hysteresis effects were observed in the dc temperature de...

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Projects (2)
Project
To utilize magnetic nanostructures in the field of catalysis and sensing.