Magnetic and ultrasonic investigations on magnetite nanofluids

Rashin, M. Nabeel; Hemalatha, J.

doi:10.1016/j.ultras.2012.08.005

Cited by 37 publications

(12 citation statements)

References 29 publications

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“…No secondary peaks are detected in the XRD pattern, which ensures the phase purity of Fe 3 O 4 . The average crystallite size obtained using the Debye–Scherrer equation , and the lattice constant ( a ) of Fe 3 O 4 calculated using the inter planar spacing are 10 and 0.84 nm, respectively. The lattice constant is in good agreement with the values of nano Fe 3 O 4 and the bulk Fe 3 O 4 reported earlier.…”

Section: Resultsmentioning

confidence: 99%

Novel Coconut Oil Based Magnetite Nanofluid as an Ecofriendly Oil Spill Remover

Rashin

Kutty

Hemalatha

2014

Ind. Eng. Chem. Res.

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The removal of oil spills from a water surface has huge industrial importance, in view of ecological safety. A novel, ecofriendly coconut oil based magnetite nanofluid is prepared by the coprecipitation method, for removing oil contaminants from water. Magnetic particles with face centered cubic crystal structure and superparamagnetic behavior are prepared and used to get a stable suspension in coconut oil. The superhydrophobicity and superoleophilicity of the nanofluid are examined through contact angle measurements. The fluid offers a contact angle of 166° which is greater than the critical angle of 150°, indicating its superhydrophobic nature. This paper demonstrates the usage of the magnetite–coconut oil nanofluid in the removal of an oil spill from water with 91% efficiency. The mechanism is based on the selective absorbance property of superhydrophobic and superoleophilic nanofluids, which can collect contaminant oil while completely repelling the water molecules. When magnetic nanofluid is added to oil contaminated water, the nonpolar hydrophobic part of the contaminant oil gets attached to the carrier fluid (coconut oil) through London dispersive forces; this is then collected along with the magnetic nanofluid, by applying a magnetic field. The proposed method is an efficient biocompatible one that can be used on a large scale, for the cleanup of oil spills on water surfaces.

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Section: Resultsmentioning

confidence: 99%

Novel Coconut Oil Based Magnetite Nanofluid as an Ecofriendly Oil Spill Remover

Rashin

Kutty

Hemalatha

2014

Ind. Eng. Chem. Res.

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“…In a study by Lopez et al [26], Co (1−x) Zn x Fe 2 O 4 nanoparticles were deposited using cobalt (II) chloride hexahydrate, iron (III) chloride hexahydrate, and zinc sulfate heptahydrate in NaOH water solution at 80 • C. These nanoparticles exhibited fine ferrite nanoparticle behavior in vibrating sample magnetometry and X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) tests. Table 1 presents a summary of the magnetic nanofluid preparation [27][28][29][30][31][32][33][34][35][36][37][38]. Currently, a water-based Fe 3 O 4 nanofluid is widely used, but there has been hardly any research into alternatives.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Experimental Study on the Thermophysical Characteristics of DI Water Based Co0.5Zn0.5Fe2O4 Nanofluid for Solar Thermal Harvesting

2020

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The thermophysical properties of water-based Co0.5Zn0.5Fe2O4 magnetic nanofluid were investigated experimentally. Consequently, the viscosities of 0.25 wt% and 1 wt% Co0.5Zn0.5Fe2O4 nanofluid were 1.03 mPa∙s and 1.13 mPa∙s, each greater than that of the 20 °C base fluid (water), which were increased by 7.3% and 17.7%, respectively. The Co0.5Zn0.5Fe2O4 nanofluid thermal conductivity enhanced from 0.605 and 0.618 to 0.654 and 0.693 W/m·°C at concentrations of 0.25 wt% and 1 wt%, respectively, when the temperature increased from 20 to 50 °C. The maximum thermal conductivity of the Co0.5Zn0.5Fe2O4 nanofluid was 0.693 W/m·°C at a concentration of 1 wt% and a temperature of 50 °C. Furthermore, following a solar exposure of 120 min, the photothermal energy conversion efficiency of 0.25 wt%, 0.5 wt%, 0.75 wt%, and 1 wt% Co0.5Zn0.5Fe2O4 nanofluids increased by 4.8%, 5.6%, 7.1%, and 4.1%, respectively, more than that of water.

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“…Interest in the interaction of the acoustic waves with colloidal media has a long history (Challis et al 2005). The application of the ultrasound techniques to the study of the properties of magnetic fluids started in the late 1970s with the pioneering work of Chung and Isler (1978) and continuing until today (Skumiel et al 2003; Józefczak and Skumiel 2006; Charaziak et al 2008; Hornowski et al 2008; Motozawa et al 2008; Rozynek et al 2011; Rashin and Hemalatha 2012; Kúdelčík et al 2013). The description of magnetic fluids by ultrasound requires formal theoretical basis which relates the properties of the medium to the complex wavenumber governing propagation.…”

Section: Introductionmentioning

confidence: 99%

Acoustic wave in a suspension of magnetic nanoparticle with sodium oleate coating

et al. 2014

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The ultrasonic propagation in the water-based magnetic fluid with doubled layered surfactant shell was studied. The measurements were carried out both in the presence as well as in the absence of the external magnetic field. The thickness of the surfactant shell was evaluated by comparing the mean size of magnetic grain extracted from magnetization curve with the mean hydrodynamic diameter obtained from differential centrifugal sedimentation method. The thickness of surfactant shell was used to estimate volume fraction of the particle aggregates consisted of magnetite grain and surfactant layer. From the ultrasonic velocity measurements in the absence of the applied magnetic field, the adiabatic compressibility of the particle aggregates was determined. In the external magnetic field, the magnetic fluid studied in this article becomes acoustically anisotropic, i.e., velocity and attenuation of the ultrasonic wave depend on the angle between the wave vector and the direction of the magnetic field. The results of the ultrasonic measurements in the external magnetic field were compared with the hydrodynamic theory of Ovchinnikov and Sokolov (velocity) and with the internal chain dynamics model of Shliomis, Mond and Morozov (attenuation).

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Magnetic and ultrasonic investigations on magnetite nanofluids

Cited by 37 publications

References 29 publications

Novel Coconut Oil Based Magnetite Nanofluid as an Ecofriendly Oil Spill Remover

Novel Coconut Oil Based Magnetite Nanofluid as an Ecofriendly Oil Spill Remover

Comprehensive Experimental Study on the Thermophysical Characteristics of DI Water Based Co0.5Zn0.5Fe2O4 Nanofluid for Solar Thermal Harvesting

Acoustic wave in a suspension of magnetic nanoparticle with sodium oleate coating

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