Yadolah Ganjkhanlou

Utrecht University

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Mahmood Kazemzad

Materials and Energy Research Center

Abdolmajid Bayandori Moghaddam

University of Tehran

Roman Bulánek

University of Pardubice

Gloria Berlier

University of Turin

Habibeh Hadad Dabaghi

Islamic Azad University, Karaj

Touradj Ebadzadeh

Materials and Energy Research Center

Bert M. Weckhuysen

Utrecht University

Silvia Bordiga

National Interuniversity Consortium of Materials Science and Technology

Ali Mohammadi

Dongguk University

Florian Meirer

Utrecht University

Cooperative Institutions

Materials and Energy Research Center

University of Tehran

University of Turin

University of Oslo

Utrecht University

National Interuniversity Consortium of Materials Science and Technology

Tehran University of Medical Sciences

Shahid Beheshti University

University of Pardubice

Amirkabir University of Technology

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Effect of Zn addition on optical properties and microstructure of Y₂O₃:Eu nanopowders prepared by combustion method

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics (2010)

Esmaeil Tohidlou Yadolah Ganjkhanlou Mahmood Kazemzad Mahdi Shafiee Afarani

Abstract Y 2 O 3 :Eu and Y 2 O 3 :Eu,Zn nano powders were prepared by both conventional combustion and microwave assistance combustion (MAC) methods. The nanopowders obtained here were investigated by means of X‐ray diffractometry (XRD), Photoluminescence spectroscopy (PL) and scanning electron microscopy (SEM). The chromaticities of samples were also computed from Photoluminescence emission spectra, as well as lattice constant and micro‐structural parameters (crystallite size and micro‐strain) which were computed from XRD patterns using Rietveld refinement method. Results showed that incorporation of Zn in Y 2 O 3 :Eu lattice enhanced the PL intensity and chromaticity of Y 2 O 3 :Eu phosphor. It was also found that the samples prepared by microwave assistance combustion method had higher crystallinity, density, chromaticity and PL intensity than the samples prepared by conventional combustion method. SEM micrographs showed that the size of particles produced in microwave was smaller than that of samples produced in electric furnace. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Rietveld Refinement

Chromaticity

Lattice constant

10.1002/pssc.200983794

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Citations (10)

The Effects of ZnO Additive on Sintering Behavior, Microstructural Evolution and Microwave Dielectric Properties of Li2TiO3 Ceramics

DOAJ (DOAJ: Directory of Open Access Journals) (2019)

Touradj Ebadzadeh S. Ghaffari Mohammad Alizadeh Keivan Asadian Yadolah Ganjkhanlou

Electroceramics

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Citations (1)

EFFECT OF pH ON THE ELECTRODEPOSITION OF Cu(In, Al)Se₂ FROM AQUEOUS SOLUTION IN PRESENCE OF CITRIC ACID AS COMPLEXING AGENT

Surface Review and Letters (2015)

Yadolah Ganjkhanlou Touradj Ebadzadeh Mahmood Kazemzad Amir Maghsoudipour Mansoor Kianpour-Rad

Effect of pH on the one-step electrodeposition of Cu ( In , Al ) Se 2 chalcopyrite layer in the presence of citric acid has been investigated by applying different electrochemical and characterization techniques. It has been observed that at pH of 1.5, nanocrystalline phase of chalcopyrite and small amount of binary phase of Cu 2 Se with overall composition of Cu 0.91 In 0.32 Al 0.39 Se 2 have been deposited. On the other hand, at pH of 4, the film composition changed to Cu 1.9 In 0.05 Al 0.21 Se 2 and an additional binary phase of copper selenide ( CuSe ) has also been formed. Morphological investigation illustrated that smooth and compact layer with fine spherical particles having the size of ~20 nm has been obtained at pH of 1.5 whereas mixture of planar and spherical particles with size of 450–550 nm have been formed at pH of 4. In alkaline environment (pH~9), the deposition current has been noticeably decreased and no deposition occurred due to the formation of a stable complex of citric acid with metal ions. The mechanism of citric acid interaction with metal ions at different pH has also been studied by cyclic voltammetry measurement.

Font

Nanocrystalline material

Deposition

10.1142/s0218625x15500572

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Citations (5)

Fluorescent‐Probe Characterization for Pore‐Space Mapping with Single‐Particle Tracking

Angewandte Chemie International Edition (2023)

Rafael Mayorga González J. J. Erik Maris Marita Wagner Yadolah Ganjkhanlou Johan G. Bomer

Porous solids often contain complex pore networks with pores of various sizes. Tracking individual fluorescent probes as they diffuse through porous materials can be used to characterize pore networks at tens of nanometers resolution. However, understanding the motion behavior of fluorescent probes in confinement is crucial to reliably derive pore network properties. Here, we introduce well-defined lithography-made model pores developed to study probe behavior in confinement. We investigated the influence of probe-host interactions on diffusion and trapping of confined single-emitter quantum-dot probes. Using the pH-responsiveness of the probes, we were able to largely suppress trapping at the pore walls. This enabled us to define experimental conditions for mapping of the accessible pore space of a one-dimensional pore array as well as a real-life polymerization-catalyst-support particle.

Characterization

Particle (ecology)

Confined space

Nanometre

Tracking (education)

10.1002/anie.202314528

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Citations (0)

Application of Image Analysis in the Characterization of Electrospun Nanofibers

Iranian Journal of Chemistry & Chemical Engineering-international English Edition (2014)

Yadolah Ganjkhanlou Bayandori Moghaddam Abdolmajid Samanesadat Hosseini Tayebe Nazari Gazmeh Akbar

In this work, CoFe 2O4 nanoparticles have been prepared by co-precipitation technique. The synthesized CoFe 2O4 nanoparticles were applied in the preparation of CoFe 2O4/Polyacrylonitrile fiber nanocomposites by the electrospinning process. The prepared nanoparticles and nanofibers were characterized using the Scanning Electron Microscopy (SEM) and X-ray diffraction methods. The results manifested that nanofibers of PAN and CoFe 2O4 /PAN were successfully prepared with electrospinning method. Grayscale SEM images of nanofibers were analyzed by a new image analysis procedure for determination of fibers diameter, their diameter distribution and the compactness of electrospun nanofibers. It was found that the presence of CoFe 2O4 nanoparticles in the PAN solution increases both of the compactness of electrospun nanofibers and their diameter. The prepared CoFe 2O4/Polyacrylonitrile fiber nanocomposites have possible applications in fabrication of sensor and magnetic recording media.

Polyacrylonitrile

Electrospinning

10.30492/ijcce.2014.10750

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Citations (6)

Ethene oligomerization on nickel microporous and mesoporous-supported catalysts: Investigation of the active sites

Catalysis Today (2017)

Reynald Henry Mustafa Kømurcu Yadolah Ganjkhanlou Rasmus Y. Brogaard Lu Li

10.1016/j.cattod.2017.04.029

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Citations (68)

PREPARATION OF IRON DOPED TITANIUM DIOXIDE COATINGS VIA SPIN-COATING OF POLYMERIC PRECURSOR AND INVESTIGATION OF THEIR PHOTOCATALYTIC ACTIVITY UNDER VISIBLE LIGHT IRRADIATION

Journal of Color Science and Technology (2013)

Mehrnaz Gharagozlou Yadolah Ganjkhanlou

Nanosized titanium dioxide has received much attention because of many applications in semiconductors, sensors, antibacterial and hygienic materials, photocatalysts and solar cells. In this study, pure and iron doped titanium dioxide nanostructured coatings were prepared by spin-coating of polymeric precursor method. Prepared samples were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, UV-Vis spectroscopy and atomic force microscopy. The effect of iron addition on their photocatalytic activity under visible light irradiation was investigated by the degradation of methyl orange. Results showed that for the nanostructured coating of pure titanium dioxide prepared by the above method, both anatase and rutile have been observed. While for iron doped nanostructured coatings the anatase phase has been stabilized and rutile phase has been completely excluded. Also, the addition of iron at concentrations less than 1 mole percent increases the TiO2 photocatalytic properties, while higher concentrations decrease the photocatalytic properties. These results are in good agreement wirh the predictions of the absorption edge data and X-ray diffraction pattern of samples. As a result it was found that the optimum amount of iron ions doped in nanostructured titanium dioxide coatings prepared by polymeric precursor spin coating method was determined to be 0.3 mole percent to achieve the best photocatalytic activity.

Rutile

Titanium Dioxide

Methyl orange

Spin Coating

Visible spectrum

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Distribution of Eu ions in Y₂O₃:Eu nanopowders prepared by solution combustion method

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics (2010)

Yadolah Ganjkhanlou Fereydoun Alikhani Hessari Mahmood Kazemzad Ghader Darbandi

Abstract Y 2 O 3 :Eu nanopowder was prepared by urea solution combustion method. The samples were then characterized by X‐ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The XRD patterns of samples were investigated by Warren‐Averbach method in order to determine crystallite size and strain distribution. An innovative method was developed for prediction of dopant ion distribution in host lattice using Warren‐Averbach method and micro‐strain distribution. Analyzing of Y 2 O 3 :Eu nanopowder by this method revealed that the Eu ions preferentially accumulated in near the grain boundaries more than the inner parts of crystallites. The good match between the crystallite size distribution prediction by Warren‐Averbach method and distribution calculated from HRTEM image was obtained (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

10.1002/pssc.200983795

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Citations (3)

In Situ Investigation of the Deactivation Mechanism in Ni-ZSM5 During Ethylene Oligomerization

Topics in Catalysis (2017)

Yadolah Ganjkhanlou Gloria Berlier Elena Groppo Elisa Borfecchia Silvia Bordiga

Carbocation

10.1007/s11244-017-0845-6

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Citations (9)

The effect of vanadium content and speciation on the activity of VOx/ZrO2 catalysts in the conversion of ethanol to acetaldehyde

Applied Catalysis A General (2018)