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Article

R. Aghababazadeh, A.R. Mirhabibi, F. Moztarzadeh and Z. Salehpour

In this paper, the synthesis and the application of chromic oxide as a high temperature pigment have been reported. To synthesise chromic oxide, solid‐state reaction using…

Abstract

In this paper, the synthesis and the application of chromic oxide as a high temperature pigment have been reported. To synthesise chromic oxide, solid‐state reaction using sulphur and sodium chromate tetrahydrate was undertaken. Morphology of the pigment synthesised was investigated by scanning electron microscopy. Formation of the chromic oxide was observed at 888°C in an oxidising atmosphere. Thorough washing of the resultant pigment played a vital role in the aggregation of the pigment particles, as demonstrated by a particle size characteristics.

Details

Pigment & Resin Technology, vol. 32 no. 3
Type: Research Article
ISSN: 0369-9420

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Article

R. Aghababzadeh, A.R. Mirhabibi, H. Bastami, E.T. Taheri‐Nassaj and L. Lin

To investigate the effects of the temperature of synthesis and of the thermal treatment of zinc chromate on the properties of the zinc chromate pigments.

Abstract

Purpose

To investigate the effects of the temperature of synthesis and of the thermal treatment of zinc chromate on the properties of the zinc chromate pigments.

Design/methodology/approach

Zinc chromate pigments was prepared using zinc salt solution, sodium hydroxide and potassium dichromate solutions. The reaction temperature was varied in order to evaluate the effect of the reaction temperature on the properties of the pigment synthesised. The pigment obtained was heated to 10°C above the critical temperature in order to investigate the effect of thermal treatment on the pigment properties. SEM, XRD, XFR and STA were employed for the characterisation of the pigments synthesised.

Findings

Reaction temperature had a significant effect on the properties of the resulting pigment. Thermal treatment of the pigment caused the decomposition of the zinc chromate phase to ZnO, ZnCr2O4 and K2CrO4 phases. The glaze containing zinc chromate had satisfactory colour characteristics.

Research limitations/implications

The study focused on the preparation and evaluation of zinc chromate as a substitute for praseodymium zircon in glaze. The study could be extended to investigation of similar inorganic pigment for similar purposes.

Practical implications

The information on the effects of the reaction temperature of pigment synthesis and of thermal treatment of the pigment is useful for industrial production of the pigment of satisfactory properties.

Originality/value

Novel use of zinc chromate as a lower‐cost substitute for praseodymium zircon in glaze and understanding of the effects of the production conditions on the properties of the resulting pigment and the glaze.

Details

Pigment & Resin Technology, vol. 34 no. 3
Type: Research Article
ISSN: 0369-9420

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Article

A.R. Mirhabibi, F. Moztarzadeh, A. Aghajani Bazazi, M. Solati, A. Maghsoudipour and M.H. Sarrafi

Long afterglow Sr2MgSi2O7 (SMS) phosphor was prepared by Douby's methods at high temperature and reductive atmosphere. The excitation and emission spectra of this phosphor…

Abstract

Long afterglow Sr2MgSi2O7 (SMS) phosphor was prepared by Douby's methods at high temperature and reductive atmosphere. The excitation and emission spectra of this phosphor showed that both had broad bands and that the main emission peak at 469 nm was due to 4f‐5d transitions of Eu+2 and implied that the luminescence centres Eu+2 occupied the Sr+2 sites in the Sr2MgSi2O7 host. The phosphor doped only with Eu ions did not demonstrate the long afterglow phenomenon, but when co‐doped with Dy+3 ions in the SMS matrix, significant long afterglow was observed.

Details

Pigment & Resin Technology, vol. 33 no. 4
Type: Research Article
ISSN: 0369-9420

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Article

A.R. Mirhabibi, H. Bastami, E.T. Nassaj, R. Aghababzadeh and L. Lin

Zinc potassium chromate (4Zn·O4CrO3·K2O·3H2O) was prepared using zinc salt solution, sodium hydroxide and potassium dichromate solutions. The pigment synthesised was…

Abstract

Zinc potassium chromate (4Zn·O4CrO3·K2O·3H2O) was prepared using zinc salt solution, sodium hydroxide and potassium dichromate solutions. The pigment synthesised was investigated by various methods. Upon heating, this pigment underwent decomposition to form ZnCr2O4, K2CrO4 and ZnO. The pigment obtained was successfully used in the preparation of glaze and then on a tile. The L*, a* and b* values of the fired glaze were 71.607, 2.695 and 67.327, respectively.

Details

Pigment & Resin Technology, vol. 33 no. 6
Type: Research Article
ISSN: 0369-9420

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Article

M. Rabiee, A.R. Mirhabibi, F. Moztar Zadeh, R. Aghababazadeh, E. Mohaghegh Pour and L. Lin

The purpose of this paper is to develop a new method for biomolecular recognition based on light scattering of ZnS:Mn nano‐particle functionalised with biotin.

Abstract

Purpose

The purpose of this paper is to develop a new method for biomolecular recognition based on light scattering of ZnS:Mn nano‐particle functionalised with biotin.

Design/methodology/approach

ZnS:Mn nano‐particles was successfully synthesised from quaternary water‐in‐oil micro‐emulsion system. The addition of biotin and the subsequent specific binding events alter the dielectric environment of the nano‐particle, resulting in a spectral shift of the particle plasmon resonance. Cyclohexane was used as oil, Triten X‐100 as surfactant, n‐hexanol as a co‐surfactant and mercaptoethanol for the best linking of biological part to nano‐particle. Measurement of the content of avidin was achieved by detecting the Department of Biomedical Engineering change in the excited emission. For qualitative and quantitative analyses of this product, scanning electron microscopy, transmission electron microscopy, energy dispersive X‐ray spectroscopy and spectrograph techniques were used.

Findings

It was observed that with reducing particle size, emission shifted to the lower wave lengths. In addition, with conjugation between avidin and biotin by mercaptoethanol in biologic media, spectral emission decreased.

Practical implications

The method developed could be utilised for synthesis of a variety of ZnS:Mn nano‐particles for a wide range of diagnostic applications.

Originality/value

The method for biomolecular recognition based on light scattering of ZnS:Mn nano‐particle functionalised with biotin developed was novel.

Details

Pigment & Resin Technology, vol. 37 no. 4
Type: Research Article
ISSN: 0369-9420

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Article

A.R. Mirhabibi, M. Rabiee, R. Aghababazadeh, F. Moztarzadeh and S. Hesaraki

ZnS:Cu phosphors were prepared by co‐precipitating Cu along with ZnS using H2S and thiourea. Phosphors giving luminescence at around 530 nm were prepared. The difference…

Abstract

ZnS:Cu phosphors were prepared by co‐precipitating Cu along with ZnS using H2S and thiourea. Phosphors giving luminescence at around 530 nm were prepared. The difference in the characteristic properties among the samples prepared appeared to be due to the formation of nanoparticles during the preparation of the samples by different methods.

Details

Pigment & Resin Technology, vol. 32 no. 6
Type: Research Article
ISSN: 0369-9420

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Article

Mohammad Bagher Askari, Mohammad Reza Bahrampour, Vahid Mirzaei, Amir Khosro Beheshti Marnani and Mirhabibi Mohsen

The aim of this paper is to apply a watery infrared filter for silicon solar cell efficiency enhancement in Kerman province of Iran as a talent region for solar energy production.

Abstract

Purpose

The aim of this paper is to apply a watery infrared filter for silicon solar cell efficiency enhancement in Kerman province of Iran as a talent region for solar energy production.

Design/methodology/approach

With this research, the water is applied as a filter for silicon solar cells in different volumes and thicknesses.

Findings

The obtained results showed that using various amounts of water could be a suitable choice for increasing the efficiency of silicon solar cells.

Originality/value

Other wavelength regions just cause the increase in the entropy and decrease in the efficiency. With this research, the water is applied as a filter for silicon solar cell in different volumes and thickness. The obtained results showed that using different thicknesses of water could be suitable choice for increasing the efficiency of silicon solar cell.

Details

World Journal of Engineering, vol. 14 no. 5
Type: Research Article
ISSN: 1708-5284

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Article

Mohammad Reza Bahrampour, Mohammad Bagher Askari, Vahid Mirzaei Mahmoud Abadi, Mohsen Mirhabibi and Mahdi Tikdari

This paper aims to study the Lut desert, also known as the Dasht–e–Lut, starting with a summary of its location as a large salt desert in southeastern Kerman, Iran, as…

Abstract

Purpose

This paper aims to study the Lut desert, also known as the Dasht–e–Lut, starting with a summary of its location as a large salt desert in southeastern Kerman, Iran, as well as its climate, being one of the world’s driest places. Next, a statistical analysis is performed based on a reasonable minimum level of 10 per cent. The computation of electric energy produced by sunlight in the studied region is, then, provided using a number of high-efficiency and suitable solar cells. Finally, the authors will compare the production of electrical energy to the consumption energy in Iran and Kerman province.

Design/methodology/approach

According to calculations of the present study and the analyses of the tables and charts provided, the use of solar energy and the amount of energy used in different areas was discussed. Lut desert in Iran is one of the touristic attractions of Kerman province: while only a very small area of this desert known as the Kalut is of interest to tourists, the vast remaining area of this desert is currently left without use. Lut and its surrounding towns and villages are not suitable for agricultural due to the lack of water in the region, and relatively poor people live within the area. The findings of this study showed that throughout the region, there is a very high potential for energy supply of Kerman and Iran.

Findings

The practical use of Lut desert potential in the production of electric energy from solar energy, besides its significant role in cost reductions, can also positively affect the living standards of local residents as well as job and income creation for the country. Efficient use of only 10 per cent of the area of Lut desert, via using its solar energy, can produce a considerable amount of energy for the region and for the country in large. Although the present study only investigated the solar energy of the region, it also has a high potential in wind energy and geothermal optimum use. The research team will, hence, continue its work on calculating the amount of energy generated from all types of renewable energy in this area. This paper showed that application of solar cells in this region is appropriate for providing a magnificent amount of electric-energy requirements of Kerman province and of Iran.

Originality/value

In recent years, Iran’s nuclear, oil and natural-gas industries have been the subject of intensifying sanctions from certain international communities. Now, the country wants to develop a sector in which it has more leeway, i.e. the renewable energy; wind and solar energies are always available, and no one can put sanctions on them. Also, to provide household electricity in remote areas (which are not connected to the mains electricity grid), energy storage is required for use of renewable energy. Usually, however, renewable energy is derived from the main electricity grid, and this means that as the mains electricity grid is organized so as to produce the exact amount of energy being consumed at that particular moment, the energy storage is mostly not applied. Energy production on the mains electricity grid is always set up as a combination of renewable-energy plants, as well as other power plants (e.g. the fossil-fuel power plants and nuclear power). This combination, nevertheless, is essential for this type of energy supply (i.e. the wind turbines, solar power plants, etc).

Details

World Journal of Engineering, vol. 13 no. 3
Type: Research Article
ISSN: 1708-5284

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Article

Mirhabibi Mohsen, Askari Mohammad Bagher, Bahrampour Mohammad Reza, Mirzaei Mahmoud abadi Vahid and Tikdari Mahdi

Regarding the renewable energies, the cost of producing electricity and the remaining reserves from fossil fuels in Iran is compared with the same in other countries…

Abstract

Regarding the renewable energies, the cost of producing electricity and the remaining reserves from fossil fuels in Iran is compared with the same in other countries. Several advantages of renewable energies are studied in the present research with emphasis on solar energy; the Lut desert in Iran is introduced as a high potential for supplying the country’s energy. Various effects of such generation of energy on economy, environment, and public health are also studied.

Details

World Journal of Engineering, vol. 12 no. 6
Type: Research Article
ISSN: 1708-5284

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Article

Monica Malhotra, Vaishali Sahu, Amit Srivastava and Anil Kumar Misra

The purpose of this study is to investigate the effect of presence of buried flexible pipe on the bearing capacity of shallow footing. First, a model study is performed…

Abstract

Purpose

The purpose of this study is to investigate the effect of presence of buried flexible pipe on the bearing capacity of shallow footing. First, a model study is performed where shallow footing model is tested for its load settlement behavior, with and without the existence of buried PVC pipe lying vertically below the base of the footing.

Design/methodology/approach

The experimental set-up consisted of a steel box filled with sand at two different relative density values [RD = 50 per cent (medium dense) and RD = 80 per cent (dense sand)] and vertical load was applied on the model footing through hydraulic jack and reaction frame arrangement connected with a proving ring. Test results are verified numerically using commercially available finite element code PLAXIS 2D. With due verification, a parametric study has been conducted, numerically, by varying the range of input parameters, such as unit weight, angle of internal friction, diameter of buried conduit and the Elastic modulus of the soil to assess the pre cent reduction in the capacity of the foundation soil because of the presence of underlying buried flexible pipe.

Findings

Results show that for each footing, there exists a critical depth below which the presence of the buried conduit has negligible influence on the footing performance. When the conduit is located above the critical depth, the bearing capacity of the footing varies with various factors, such as geotechnical parameters of soil and location and diameter of the buried conduit.

Originality/value

It is an original paper performed to assess the presence of buried flexible pipe on the bearing capacity of the shallow footing.

Details

Journal of Engineering, Design and Technology , vol. 18 no. 3
Type: Research Article
ISSN: 1726-0531

Keywords

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