R. Azimirad

Malek Ashtar University of Technology

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S. Safa

Zabol University

Alireza Z. Moshfegh

Sharif University of Technology

Omid Akhavan

Sharif University of Technology

A. Khayatian

University of Kashan

M. Almasi Kashi

University of Kashan

Mohsen Babamoradi

Iran University of Science and Technology

S. Mokhtari

University of Bouira

Mostafa Khajeh

Zabol University

Naimeh Naseri

Sharif University of Technology

S. Javad Hashemifar

Isfahan University of Technology

Cooperative Institutions

Sharif University of Technology

Amirkabir University of Technology

Malek Ashtar University of Technology

Atomic Energy Organization of Iran

Islamic Azad University, Science and Research Branch

Iran University of Science and Technology

University of Tehran

Nuclear Science and Technology Research Institute

University of Kashan

Tarbiat Modares University

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CuO/Cu(OH)2 hierarchical nanostructures as bactericidal photocatalysts

Journal of Materials Chemistry (2011)

Omid Akhavan R. Azimirad S. Safa Elham Hasani

Various morphologies of CuO/Cu(OH)2 nanostructures with different adsorbed –OH contents were synthesized on an acid-treated Cu foil through variation of NaOH concentration from 0 to 50 mM with an in situoxidation method. X-ray diffractometry and X-ray photoelectron spectroscopy (XPS) indicated formation of CuO on the Cu(OH)2 crystalline phase at a growth temperature of 60 °C for 20 h. Antibacterial activity of the nanostructures against Escherichia coli bacteria was studied in the dark and under light irradiation. The nanostructures grown at a NaOH concentration of 30 mM showed the highest surface area and the strongest antibacterial activity among the samples. After elimination of the contribution of the effective surface area of the nanostructures to the antibacterial activity, it was found that the surface morphology and chemical composition of the nanostructures were the other most important parameters in the antibacterial activity of the nanostructures. Using XPS analysis, the better photocatalytic activity per surface area of the nanostructures prepared at higher NaOH concentrations was substantially attributed to the amount of adsorbed OH bonds on the surface of the nanostructures.

10.1039/c0jm04364h

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ZIF-8 derived porous carbon material with improved specific surface area for supercapacitor application

Chemical Physics Letters (2025)

Vahid Najafi M.H. Ehsani R. Azimirad

Specific surface area

Carbon fibers

10.1016/j.cplett.2025.141954

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AFM stochastic analysis of surface twisted nanograin chains of iron oxide: a kinetic study

Journal of Physics D Applied Physics (2009)

Omid Akhavan R. Azimirad

We have studied the stochastic parameters of surface iron oxide nanograin chains, 97 nm in diameter and 2.4 µm in length, prepared at different annealing temperatures, using atomic force microscopy (AFM) spectral analysis. In this regard, the roughness of the thin films including self-assembled twisted nanograin chains has been analysed and characterized using the height–height correlation function, the roughness exponent as well as the power spectrum density of the AFM profiles and their gradient, for the different annealing temperatures. The tip convolution effect on the stochastic parameters under study has also been investigated. The kinetics of the formation of nanograins on the film surface has been obtained using the AFM spectral analysis of the profiles and their gradient. The activation energy needed for the formation of surface nanograin chains was found to be 0.55 eV. It has been shown that the tip–surface interaction affects mainly the diffusion parameters obtained by using the surface roughness analysis of the profiles, while use of the surface roughness analysis of the gradient of the profiles results in a nearly independent tip convolution effect on the diffusion parameters. Hence, this work also provides a method for calculating the required activation energy for the formation of self-assembled nanostructures affecting the roughness of a surface.

10.1088/0022-3727/42/6/065404

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Visible light photoinactivation of bacteria by tungsten oxide nanostructures formed on a tungsten foil

Applied Surface Science (2015)

Fariba Ghasempour R. Azimirad Abbas Amini Omid Akhavan

Nanorod

Tungsten Oxide

10.1016/j.apsusc.2015.01.217

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Low temperature self-agglomeration of metallic Ag nanoparticles on silica sol–gel thin films

Journal of Physics D Applied Physics (2008)

Omid Akhavan R. Azimirad Alireza Z. Moshfegh

A facile sol–gel synthesis for self-agglomeration of metallic silver nanoparticles, with fcc crystalline structure, on the silica surface in a low annealing temperature has been introduced. X-ray photoelectron spectroscopy (XPS) revealed initial agglomeration (∼30 times greater than the nominal concentration of Ag) of the nanoparticles on the surface of the dried film (100 °C) and also their oxidation as well as easy diffusion (with 0.08 eV required activation energy) into the porous silica thin films, by increasing the annealing temperature (200–400 °C). By raising the Ag concentration from 0.2 to 1.6 mol% in the sol, the average size of the Ag nanoparticles increased from ∼5 to 37 nm corresponding to a redshift of the optical plasmon resonance absorption peak from 404 to 467 nm. The high concentration of Ag (1.6 mol%) in the sol resulted in a rough surface containing compact nanoparticles. Using power spectral density analysis of the atomic force microscopy images, we have found that the highest contributions in the surface roughness of the dried silica films were caused by the particles ranging from ∼62 to 159 nm. The particles smaller than ∼39 nm did not show any detectable contributions in the surface roughness of the dried silica film. Based on the XPS analysis, a mechanism has also been proposed for the self-agglomeration of the Ag nanoparticles on the surface of the aqueous sol–gel silica thin films.

10.1088/0022-3727/41/19/195305

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Hydrophilicity variation of WO₃ thin films with annealing temperature

Journal of Physics D Applied Physics (2007)

R. Azimirad Naimeh Naseri Omid Akhavan Alireza Z. Moshfegh

The influence of annealing temperature on the hydrophilic property of WO3 thin films deposited by thermal evaporation and sol–gel dip-coating methods was studied and compared for the first time. The thermal evaporated WO3 thin films annealed at 400 °C showed a nearly super-hydrophilic property without UV and visible illumination. By analysing the O(1s) core level peak of XPS spectra, the amount of oxygen contributed at various bonds (including O2−, OH− and H2O) on the surface of the annealed samples at different temperatures were measured. In addition, a correlation between the hydrophilicity and the concentration of chemisorbed water on the film surface was suggested, independent of the thin film deposition method.

10.1088/0022-3727/40/4/034

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Citations (98)

Graphene quantum dots incorporated UiO-66-NH2 as a promising photocatalyst for degradation of long-chain oleic acid

Chemical Physics Letters (2020)

S. Safa Mostafa Khajeh Ali Reza Oveisi R. Azimirad

10.1016/j.cplett.2020.138129

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PHOTOLUMINESCENCE PROPERTIES OF CADMIUM TUNGSTATE SYNTHESIZED BY HYDROTHERMAL METHOD

Mohammad Taghi Tourchi Moghadam M Babamoradi R. Azimirad

Tungstate

Hydrothermal Synthesis

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How CdS nanoparticles can influence TiO 2 nanotube arrays in solar energy applications?

Applied Catalysis B Environment and Energy (2014)

Mohammad Qorbani Naimeh Naseri Omran Moradlou R. Azimirad Alireza Z. Moshfegh

Photocurrent

Chemical bath deposition

Titanium Dioxide

Cadmium sulfide

Anodizing

Absorption edge

10.1016/j.apcatb.2014.06.053

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Citations (65)

Construction of a Gauge Symmetry in N - 2 Level of Open String

Indian Journal of Science and Technology (2017)

Esmaiel Pourjafarabadi R. Azimirad

Objectives: We construct new gauge symmetry in second level of open string and predict that it corresponds to a new gauge particle with same properties as photon. Methods: In literature, using a special state called spurious state has known for describing gauge symmetry in first excited level. We generalize this prescription into second excited level . Since this method is based on the fact that adding spurious state to the spectrum leads no physical consequences, it allows us to attribute gauge invariance property to the level of spectrum such that we can call this freedom gauge symmetry. Findings: In first excited state of string theory, photons associates to a symmetry called gauge symmetry. We generalize this situation to second level of spectrum. This leads us to predict that there exists a new particle which has spin 2 and act like photon i.e. it carries electromagnetic force. This new particle lives in a high energy scale which makes its detection not easy to experimentalists. We also propose that one can generalize this procedure to higher excited levels of string theory to obtain more new particles which live in open string theory energy scale. Applications/Improvements: But if someday we detect it, we can use it as a new alternative way for producing electromagnetic waves which includes a large number of applications for it for example, in telecommunication industry, medical sciences and etc. Keywords: Field Theory, Gauge Symmetry, Gauge Particles, Massive Levels, Open String, Spurious State

Spurious relationship

10.17485/ijst/2017/v10i32/113842

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