Advances in Nanoalumina Ceramic Particle Fabrication Using Sonofragmentation

doi:10.1109/TNANO.2008.2002985

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Advances in Nanoalumina Ceramic Particle Fabrication Using Sonofragmentation

Journal Article•DOI•

Advances in Nanoalumina Ceramic Particle Fabrication Using Sonofragmentation

K.R. Gopi¹, Rajarathinavelu Nagarajan¹•Institutions (1)

Indian Institute of Technology Madras¹

01 Sep 2008-IEEE Transactions on Nanotechnology (IEEE)-Vol. 7, Iss: 5, pp 532-537

TL;DR: In this article, the effects of various parameters such as ultrasonic frequency, feed concentration, sonication time, surfactant, and applied ultrasonic power on sonofragmentation were investigated.

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Abstract: The present study is focused on fabrication of high-purity submicrometer alumina ceramic particles (predominantly in sub-100 nm range) from micrometer-sized feed (e.g., 70-80 mum) using sonofragmentation. The effects of various parameters such as ultrasonic frequency, feed concentration, sonication time, surfactant, and applied ultrasonic power on sonofragmentation were investigated. Sub-100 nm particle production by sonofragmentation was validated via three metrics, i.e., laser particle size analysis, high-resolution transmission electron microscopy, and turbidimetry. There is a significant change in color and shape of alumina ceramic particles as a result of sonofragmentation. Higher size reduction ratios are obtained at lower frequencies and at higher input power. Submicrometer particle generation increases as concentration of the feed particles increases, indicating that attrition by interparticle collision is a significant mechanism. The shape of the particles changes from angular to spherical as sonofragmentation time increases. Probe-type sonication produces fragmentation effects that are less uniform than those induced by tank-type ultrasonics. Surfactant plays a significant role in preventing agglomeration, especially as finer fragments are produced with prolonged sonication.

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Journal Article•DOI•

Sonochemistry: Science and Engineering

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Nimesh Pokhrel¹, Phani Kiran Vabbina¹, Nezih Pala¹•Institutions (1)

Florida International University¹

01 Mar 2016-Ultrasonics Sonochemistry

TL;DR: The individual and mutual effect of important input parameters on the nanomaterial synthesis process as a start to help understand the underlying mechanism is discussed and an objective discussion of the diversely synthesizednanomaterial follows to divulge the easiness imparted by sonochemistry.

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239 citations

Cites background from "Advances in Nanoalumina Ceramic Par..."

...Like power, ultrasound frequency and surfactants affect the process such that low frequency and addition of relevant surfactant enhances cavitation and promotes sonofragmentation [197]....
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...require stabilizers and unnecessary power and post-processing [197]....
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...Sonication of aqueous slurry of micrometer-sized alumina showed a decrease in particle size while increasing power and decreasing frequency, and a uniform size distribution when continued for prolonged time [83][197]....
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Journal Article•DOI•

The Effects of Ultrasound on Crystals: Sonocrystallization and Sonofragmentation

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Hyo Na Kim¹, Kenneth S. Suslick•Institutions (1)

University of Illinois at Urbana–Champaign¹

04 Jul 2018

TL;DR: In this paper, the effects of ultrasound on the crystallization of organic molecules are discussed and the effect of various experimental parameters and empirical products of sonocrystallization have been reported, but the mechanisms of sonomerization and sonofragmentation have not been confirmed clearly.

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Abstract: When ultrasound is applied to a solution for crystallization, it can affect the properties of the crystalline products significantly. Ultrasonic irradiation decreases the induction time and metastable zone and increases the nucleation rate. Due to these effects, it generally yields smaller crystals with a narrower size distribution when compared with conventional crystallizations. Also, ultrasonic irradiation can cause fragmentation of existing crystals which is caused by crystal collisions or sonofragmentation. The effect of various experimental parameters and empirical products of sonocrystallization have been reported, but the mechanisms of sonocrystallization and sonofragmentation have not been confirmed clearly. In this review, we build upon previous studies and highlight the effects of ultrasound on the crystallization of organic molecules. In addition, recent work on sonofragmentation of molecular and ionic crystals is discussed.

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81 citations

Journal Article•DOI•

Ultrasonic coal-wash for de-sulfurization.

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B. Ambedkar¹, Rajarathinavelu Nagarajan¹, Sreenivas Jayanti¹•Institutions (1)

Indian Institute of Technology Madras¹

01 May 2011-Ultrasonics Sonochemistry

TL;DR: Conventional chemical-based soaking and stirring methods are compared here to ultrasonic methods of de-sulfurization, which have the main advantages of ultrasonic de-Sulfurized over conventional methods, the mechanism involved in ultrasonicDe-solfurization and the difference between aqueous-based and solvent-based (2N HNO(3), 3-volume percentage H(2)O(2)) de-magnifying methods are investigated experimentally.

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58 citations

Journal Article•DOI•

Feasibility of using ultrasound-assisted process for sulfur and ash removal from coal

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B. Ambedkar¹, T.N. Chintala¹, Rajarathinavelu Nagarajan¹, Sreenivas Jayanti¹•Institutions (1)

Indian Institute of Technology Madras¹

01 Mar 2011-Chemical Engineering and Processing

TL;DR: In this article, the authors investigated utilization of ultrasound in reagent-based coal de-ashing and de-sulfurization and derived an empirical model for the prediction of total sulfur removal.

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Abstract: The present work investigates utilization of ultrasound in reagent-based coal de-ashing and de-sulfurization. The coal under study was received from Girald mine, Rajasthan, India. Three different ultrasonic frequencies (25 kHz, Dual (58/192 kHz) and 430 kHz) and three reagents (HCl, HNO 3 and H 2 O 2 ) were used. The study employed a Taguchi fractional-factorial L 27 DOE. Experimental data were used to derive an empirical model for the prediction of total sulfur removal. The model incorporates cavitational intensity, reagent concentration, sonication time, coal particle size and coal concentration as key parameters. Effects of above factors on reagent-based ultrasonic coal-desulfurization are presented here. An optimum set of process parameters are identified and validated. Larger-scale trial with high-ash and high-sulfur coals is strongly recommended.

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45 citations

Journal Article•DOI•

Simple top-down preparation of magnetic Bi0.9Gd0.1Fe1−xTixO3 nanoparticles by ultrasonication of multiferroic bulk material

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M. A. Basith¹, Duc-The Ngo², A. Quader¹, M. A. Rahman¹, Brajalal Sinha, Bashir Ahmmad³, Fumihiko Hirose³, Kristian Mølhave² - Show less +4 more•Institutions (3)

Bangladesh University of Engineering and Technology¹, Technical University of Denmark², Yamagata University³

06 Nov 2014-Nanoscale

TL;DR: This sonication technique may be considered as a simple and promising route to prepare ultrafine nanoparticles for functional applications to synthesize ultra fine nanoparticles directly from bulk multiferroic perovskite powder.

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Abstract: We present a simple technique to synthesize ultrafine nanoparticles directly from bulk multiferroic perovskite powder. The starting materials, which were ceramic pellets of the nominal compositions Bi0.9Gd0.1Fe1−xTixO3 (x = 0.00–0.20), were prepared initially by a solid state reaction technique, then ground into micrometer-sized powders and mixed with isopropanol or water in an ultrasonic bath. The particle size was studied as a function of sonication time with transmission electron microscopic imaging and electron diffraction that confirmed the formation of a large fraction of single-crystalline nanoparticles with a mean size of 11–13 nm. A significant improvement in the magnetic behavior of Bi0.9Gd0.1Fe1−xTixO3 nanoparticles compared to their bulk counterparts was observed at room temperature. This sonication technique may be considered as a simple and promising route to prepare ultrafine nanoparticles for functional applications.

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40 citations

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Journal Article•DOI•

The interaction mechanism between cavitation bubbles and particles of the solid and liquid phases

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Viktor M. Fridman¹•Institutions (1)

Union Institute & University¹

01 Jul 1972-Ultrasonics

TL;DR: In this article, a theory which explains the effects of dispersion and coagulation in a cavitating liquid medium is proposed on the basis of a study of the interaction mechanism of a cavitation bubble and a particle of the material medium.

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22 citations

Journal Article•DOI•

Ultrasonically induced fragmentation and strain in alumina particles

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Michael D. Kass¹•Institutions (1)

Oak Ridge National Laboratory¹

01 Feb 2000-Materials Letters

TL;DR: In this paper, high purity alumina particles were sonicated in distilled water at 20 kHz and a fine particle fraction was produced, which was less than 1 μm in diameter, indicating that the formation and collapse of cavitation bubbles were relatively unaffected by particulate loading levels.

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20 citations

"Advances in Nanoalumina Ceramic Par..." refers background in this paper

...Some work on the fragmentation of alumina particles and the effect of sonication time and power level on the fragmentation process are reported elsewhere [7]....
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...Fragmentation by conventional attritional means such as grinding or milling is reported widely in literature, but contamination from the milling material, as well as energy efficiency, are definite drawbacks [2]–[6]; comminution by high-intensity ultrasound has also been studied [7]–[14], but to a lesser extent....
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...Due to ultrasonication, lattice strains [7] are induced in the ceramic particle which, in turn, help to reduce the sintering temperature....
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...Published literature only addresses particle size reduction to the 1-μm-size range [7]....
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...Experimental investigation about the effect of low-frequency ultrasound (20 kHz, 88 W) for fragmenting alumina ceramic particles of feed size 90 μm in a given volume of water (250 mL) is reported in reference [7]....
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Journal Article•DOI•

Magnetic resonance imaging of acoustic streaming: absorption coefficient and acoustic field shape estimation.

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Guillaume Madelin¹, Daniel Grucker², Jean-Michel Franconi¹, Eric Thiaudière¹•Institutions (2)

University of Bordeaux¹, Centre national de la recherche scientifique²

01 Jul 2006-Ultrasonics

TL;DR: This MRI method could be used to assess the acoustic field and time-average power of ultrasonic transducers in water (or other liquids with known physical properties), after calibration of a geometrical parameter that is dependent on the experimental setup.

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19 citations

"Advances in Nanoalumina Ceramic Par..." refers background in this paper

...It is due to transfer of momentum and energy of the acoustic field to the medium, through its attenuation coefficient [18]....
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Journal Article•DOI•

Effects of Surface Active Properties on the Cavitational Degradation of Surfactant Contaminants

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Gim-Yang Pee¹, and James F. Rathman¹, Linda K. Weavers¹•Institutions (1)

Ohio State University¹

03 Jul 2004-Industrial & Engineering Chemistry Research

TL;DR: In this paper, the influence of surfactant properties on the sonochemical degradation of organic compounds was investigated in a 20-kHz probe reactor and a dual-frequency 16-and 20kHz near-field acoustical processor (NAP).

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Abstract: The influence of surfactant properties on the sonochemical degradation of organic compounds was investigated in a 20-kHz probe reactor and a dual-frequency 16- and 20-kHz near-field acoustical processor (NAP). The initial sonochemical degradation rates of 4-octylbenzene sulfonic acid (OBS) and t-octylphenoxy polyethoxyethanol (OPE) in the NAP as a function of concentration resulted in complicated but similar trends to catalysis. At concentrations above the critical micelle concentration, the formation of micelles created additional weak spots in solution that acted as additional nucleation sites for the formation of cavitation bubbles. In comparing the degradation of surfactants to that of nonsurfactants, enhanced degradation of surfactants in the NAP was attributed to the accumulation of surfactants on cavitation bubble surfaces, resulting in localization of contaminants at the site of highest temperature and hydroxyl radical concentration, [•OH]. The lack of enhanced degradation of surfactants in the pr...

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17 citations

"Advances in Nanoalumina Ceramic Par..." refers background in this paper

...Surfactant addition to a cavitating liquid alters the surface tension of the solution, which in turn has an effect on bubble growth and dynamics [16]....
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...Addition of surfactant [16] to the cavitating liquid at concentrations above the critical micelle...
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Book•

Nanostructured Silicon-based Powders and Composites

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Andre Pierre Legrand, Christiane Senemaud

17 Apr 2007

TL;DR: Theoretical Investigations of Si/C/N Based Alloys as discussed by the authors Theoretically, the structure of some Nanopowders and Micro/Nano Composites by Transmission Electron Microscopy.

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Abstract: Objectives and State-of-the-Art Nanocomposites. Laser Synthesis of Nanosized Powders. Thermal Behavior of AS-Formed Silicon-Based Nanopowders. Structure of Some Nanopowders and Micro/Nano Composites By Transmission Electron Microscopy. From Short to Long Range Order: Structural Organization of Silicon-Based Nanopowders. Conductivity and dielectric Properties of Si/C Nanopowders. Processing and Tailoring of Based Nanocomposites. Mechanical Properties. Theoretical Investigations of Si/C/N Based Alloys.

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14 citations

"Advances in Nanoalumina Ceramic Par..." refers background in this paper

...Fragmentation by conventional attritional means such as grinding or milling is reported widely in literature, but contamination from the milling material, as well as energy efficiency, are definite drawbacks [2]–[6]; comminution by high-intensity ultrasound has also been studied [7]–[14], but to a lesser extent....
[...]