Characterization of silica–water nanofluids dispersed with an ultrasound probe: A study of their physical properties and stability
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Otros documentos de la autoría: Mondragon, Rosa; Juliá Bolívar, José Enrique; Barba-Juan, Antonio; Jarque Fonfría, Juan Carlos
Metadatos
Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7033
comunitat-uji-handle3:10234/8618
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INVESTIGACIONMetadatos
Título
Characterization of silica–water nanofluids dispersed with an ultrasound probe: A study of their physical properties and stabilityAutoría
Fecha de publicación
2012Editor
ElsevierISSN
0032-5910Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://ac.els-cdn.com/S0032591012001167/1-s2.0-S0032591012001167-main.pdf?_tid=a ...Versión
info:eu-repo/semantics/draftPalabras clave / Materias
Resumen
The stability and agglomeration state of nanofluids are key parameters for their use in different applications. Silica nanofluids were prepared by dispersing the nanoparticles in distilled water using an ultrasonic ... [+]
The stability and agglomeration state of nanofluids are key parameters for their use in different applications. Silica nanofluids were prepared by dispersing the nanoparticles in distilled water using an ultrasonic probe, which has proved to be the most effective system and gives the best results when compared with previous works. Results were obtained concerning the influence of the solid content, pH and salt concentration on the zeta potential, electrical double layer, viscosity, elastic and viscous moduli, particle size and light backscattering. Measurement of all these properties provides information about the colloidal state of nanofluids. The most important variable is the solid content. Despite the agglomeration due to high concentration, nanofluids with low viscosity and behaving like liquid were prepared at 20% of mass load thanks to the good dispersion achieved with the ultrasonic treatment. The pH of the medium can be used to control the stability, since the nanofluids are more stable under basic conditions far from the isoelectric point (IEP) and settle at pH = 2. Therefore, stable nanofluids for at least 48 h, with high solid content, can be prepared at high pH value (pH > 7) due to the electrostatic repulsion between particles. [-]
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Powder Technology Volume 224, July 2012Derechos de acceso
© 2012 Elsevier B.V. All rights reserved.
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info:eu-repo/semantics/openAccess
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