Effect of ultrasound on synthesis of spherical silica

Enomoto, Naoya; Koyano, Tomohiro; Nakagawa, Zenbe-e

doi:10.1016/1350-1477(96)00004-w

Cited by 49 publications

(24 citation statements)

References 6 publications

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“…The advantages of the ultrasound-assisted sol-gel technique over conventional routes of nanomaterials synthesis include shortening the synthesis duration due to faster hydrolysis, leading to more uniform particle size distribution, higher surface area, better thermal stability, and improved phase purity [4]. Examples of successful ultrasound-assisted sol-gel synthesis of metal oxide nanostructures include TiO 2 [8][9][10], ZnO [11][12][13], MoO 3 [14], In 2 O 3 [15], ZrO 2 [16], SiO 2 [17][18][19], etc. It was shown that in a number of cases, sonochemically prepared materials demonstrate better characteristics than those synthesized by conventional methods.…”

Section: Introductionmentioning

confidence: 99%

Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Gubanova

Baranchikov

Kopitsa

et al. 2015

Ultrasonics Sonochemistry

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In the present work, we have studied for the first time the combined effect of both sonication and precipitation pH on the structure of amorphous zirconia gels synthesized from zirconium(IV) propoxide. The techniques of small-angle neutron and X-ray scattering (SANS and SAXS) and low temperature nitrogen adsorption provided the integral data on the changes in the microstructure and mesostructure of these materials caused by ultrasonic treatment.Amorphous ZrO 2 ·xH 2 O synthesized under ultrasonic treatment was found to possess a very structured surface, characterized by the surface fractal dimension 2.9-3.0, compared to 2.3-2.5 for the non US-assisted synthesis, and it was also found to possess a higher specific surface area, while the sizes of the primary particles remain unchanged.

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Section: Introductionmentioning

confidence: 99%

Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Gubanova

Baranchikov

Kopitsa

et al. 2015

Ultrasonics Sonochemistry

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“…Further investigations may be carried out to conclude the aforementioned. Ultrasound enhanced high intensity collisions occurring between particles dispersed in the solution may lead to water condensation reaction as reported by Enomoto et al [34] and Frost et al [35]. The observation of higher weight loss in the case of US synthesized sample could be due to this phenomenon as well.…”

Section: Thermogravimetric Analysismentioning

confidence: 74%

“…Also, we are further investigation the role of ultrasound on the reaction time and yields of the products when compared to the conventional method. For sonochemical synthesis technique, the ultrasound was generated with the help of a horn type ultrasonic instrument set up [34]. The schematic of the setup is given in Fig.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound and Conventional Synthesis of Ceo<sub>2</sub>/Zno Nanocomposites and Their Application in the Photocatalytic Degradation of Rhodamine B Dye

Shah¹,

Bhangaonkar²,

Pinjari³

et al. 2017

JAN

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Abstract. CeO 2 /ZnO composite nanoparticles are synthesized by using in-situ precipitation method, without any stabilizers, via conventional i.e. non-ultrasound (NUS) and ultrasound-assisted processing technique (US). The structure, morphology, particle size and % weight loss of the synthesized nanoparticles were analyzed by using X-ray powder diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) to establish the formation of core shell type nanomaterials with an average particle size under 15 nm. The effectiveness of the synthesized core shell morphology of CeO 2 /ZnO (catalyst) for the photocatalytic degradation of Rhodamine B (RhB) dye has also been investigated. It has been observed that the catalysts prepared by sonochemical method exhibit higher photocatalytic activity as compared to the catalysts prepared by the conventional method. It was also found that the ultrasound-assisted technique is an energy efficient method as it saves more than 80% of energy along with a substantial reduction in reaction time, as compared to conventional synthesis technique.

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“…A única diferença provável entre as matrizes obtidas pelo método clássico e sob ultra-som foi sua porosidade que modifica as propriedades ópticas do material 26 . Partículas esféricas de sílica preparadas sob energia ultrasônica, a partir de TEOS, NH 3 e H 2 O (método Stöber) 27 , apresentam aumento do tamanho de partícula com o aumento da intensidade ultra-sônica. No entanto, o aumento da intensidade de sonificação, a 20 kHz, induz a aglomeração das esferas.…”

Section: Sonogéisunclassified

O efeito do ultra-som em reações químicas

Martines¹,

Davolos²,

Júnior³

2000

Quím. Nova

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Recebido em 2/2/99; aceito em 16/6/99 THE ULTRASOUND EFFECT ON CHEMISTRY REACTIONS. Unusual chemical phenomenon associated with ultrasound is on account of cavitation effect. The ultrasound increase the rate and yield of chemical reaction on account of its ability to emulsify liquids. When the ultrasound is used in metallic catalyst reaction the activity of catalyst is increased because the ultrasound clean the surface of catalyst. Sonogels have a fine porosity and large specific surface improving different properties. This paper deals with ultrasound phenomenon and gives some examples of reactions and properties where this radiation takes an important role.

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Effect of ultrasound on synthesis of spherical silica

Cited by 49 publications

References 6 publications

Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Ultrasound and Conventional Synthesis of Ceo<sub>2</sub>/Zno Nanocomposites and Their Application in the Photocatalytic Degradation of Rhodamine B Dye

O efeito do ultra-som em reações químicas

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