Search results for: M.C. Amiri

Items from 1 to 10 out of 10 results

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A novel method to synthesize copper oxide nanoparticles by using colloidal gas aphrons

S.S. Banifatemi, H. Mohammadifard, M.C. Amiri

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2016 > 497 > C > 35-40

There is a great interest to synthesize copper oxide nanoparticles (CuO NPs) because of their wide usage in various applications such as manufacturing antibacterial materials, solar cells, gas sensors, photovoltaic cells; as well as drag reduction, and catalysis. Different techniques such as sol–gel, microwave irradiation, microemulsion, and thermal decomposition of precursors have been developed...

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A new stability index for characterizing the colloidal gas aphrons dispersion

H. Sadeghialiabadi, M.C. Amiri

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2015 > 471 > Complete > 170-177

Aphrons are surfactant stabilized microbubbles with thick soapy shells. Stability is a key feature of microbubbles. Colloidal gas aphrons (CGAs), with an average diameter of 50μm, offer particular advantages where the stability of microbubbles is of interest. Various factors that affect on CGA stability such as surfactant type, concentration, and processing parameters have been extensively studied...

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Evaluating the stability of colloidal gas aphrons in the presence of montmorillonite nanoparticles

M.C. Amiri, H. Sadeghialiabadi

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2014 > 457 > Complete > 212-219

To block rock pores in aphron drilling operation, colloidal gas aphrons (CGAs) stability is a key factor to minimize formation damage. Although the synergistic stabilization of aqueous foam by solid particles and surfactants has been extensively studied, there are few references for synergistic stabilization of CGAs. In this experimental study, stability of CGAs has been investigated in the presence...

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An innovative simultaneous glucoamylase extraction and recovery using colloidal gas aphrons

A. Zad Zidehsaraei, M. Moshkelani, M.C. Amiri

Separation and Purification Technology > 2009 > 67 > 1 > 8-13

Recovery and purification of biological products generally involve complicated processes that cost even up to 70% of final product price. Because of many commercial applications of glucoamylase, its innovative purification methods are still desired. In this paper, colloidal gas aphrons, generated with cationic and anionic surfactants at their critical micelle concentration (CMC), have been used to...

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Electrical conductivity as a novel technique for characterization of colloidal gas aphrons (CGA)

M. Moshkelani, M.C. Amiri

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2008 > 317 > 1-3 > 262-269

Colloidal gas aphron (CGA) characterization demands further investigation for exploring its potential ability in separation processes. In this paper, both integrated and differentiated electrical conductivity (EC) of CGA dispersion was measured and compared with surfactant concentration. They confirm each other well. The range of concentration of anionic surfactant for producing CGA was chosen from...

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Enhancing permeate flux in a RO plant by controlling membrane fouling

M.C. Amiri, M. Samiei

Desalination > 2007 > 207 > 1-3 > 361-369

Concentration polarization near the membrane surface increases local trans-membrane osmotic pressure and solute passage. It is governed by solute properties, membrane properties and hydrodynamics. Increasing the feed velocity confines the affected area to a thinner layer and usually results in reducing membrane fouling and scaling phenomena. Higher feed velocity reduces scaling and fouling. The results...

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On reduction in the surface tension of water due to magnetic treatment

M.C. Amiri, Ali A. Dadkhah

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2006 > 278 > 1-3 > 252-255

Water treatment by magnetic field (MF) or physical water treatment (PWT) is an attractive but still controversial issue. The main purpose of the present study was to investigate whether or not a physical water treatment reduces the surface tension of water as reported in some scientific literature. In this paper PWT phenomenon was studied by measuring surface tension of treated and untreated waters...

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Efficient separation of bitumen in oil sand extraction by using magnetic treated process water

M.C. Amiri

Separation and Purification Technology > 2006 > 47 > 3 > 126-134

Extraction is a complex and also a key unit operation for separating and recovery of bitumen in oil sand industry. It has been reported that calcium and magnesium ions cause reduction in bitumen recovery. Experimental evidences showed that hardness ions in water act as a binder between montmorillonite clay particles and bitumen droplets (hetero-coagulation process), resulting in a coating layer of...

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Effect of gas transfer on separation of whey protein with aphron flotation

M.C. Amiri, K.T. Valsaraj

Separation and Purification Technology > 2004 > 35 > 2 > 161-167

The efficiency of conventional flotation sharply reduces when the diameter of dispersed particles are less than 10μm and it fails completely for particles less than 1μm. Colloidal gas aphron (CGA) bubbles, offer particular advantages in the removal of ultra-fine particles. Aphron flotation can be considered for separation of whey protein because of its submicron size. As the characteristics of aphron...