%0 Journal Article %1 Fazio2008 %A Fazio, S. %A Guzman, J. %A Colomer, M. %A Salomoni, A. %A Moreno, R. %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND %D 2008 %I ELSEVIER SCI LTD %J JOURNAL OF THE EUROPEAN CERAMIC SOCIETY %K TiO2; behaviour; colloidal nanopowders; potential zeta %N 11 %P 2171-2176 %R 10.1016/j.jeurceramsoc.2008.02.017 %T Colloidal stability of nanosized titania aqueous suspensions %V 28 %X In this work the colloidal behaviour of three different TiO2 nanopowders in water is studied. A commercial powder of anatase and another of rutile were used for this study. For comparison purposes, a cryogel of anatase synthesised by a particulate sol-gel route and freeze-dried was also studied. All three powders were characterised by scanning electron microscopy, specific surface area measurements and X-ray diffraction. Diluted aqueous suspensions were prepared and characterised in terms of particle size distribution and zeta potential, using dynamic light scattering and laser Doppler velocimetry principles, respectively. All suspensions were prepared using an ultrasounds probe for mixing times ranging from 0 to 5 min. Colloidal stability was studied as a function of pH, type and concentration of dispersants (polyacrylic-based deflocculant and citric acid) and mixing time. Stable suspensions of commercial nanosized powders were obtained with polyelectrolyte contents of 1.0-1.5 wt.\%. No stable suspensions of the cryogel were obtained with polyelectrolyte, requiring in this case the use of citric acid as deflocculant. It was observed that neither the size distribution nor the zeta potential values were affected by the sonication time. (C) 2008 Elsevier Ltd. All rights reserved.

@article{Fazio2008, abstract = {In this work the colloidal behaviour of three different TiO2 nanopowders in water is studied. A commercial powder of anatase and another of rutile were used for this study. For comparison purposes, a cryogel of anatase synthesised by a particulate sol-gel route and freeze-dried was also studied. All three powders were characterised by scanning electron microscopy, specific surface area measurements and X-ray diffraction. Diluted aqueous suspensions were prepared and characterised in terms of particle size distribution and zeta potential, using dynamic light scattering and laser Doppler velocimetry principles, respectively. All suspensions were prepared using an ultrasounds probe for mixing times ranging from 0 to 5 min. Colloidal stability was studied as a function of pH, type and concentration of dispersants (polyacrylic-based deflocculant and citric acid) and mixing time. Stable suspensions of commercial nanosized powders were obtained with polyelectrolyte contents of 1.0-1.5 wt.\%. No stable suspensions of the cryogel were obtained with polyelectrolyte, requiring in this case the use of citric acid as deflocculant. It was observed that neither the size distribution nor the zeta potential values were affected by the sonication time. (C) 2008 Elsevier Ltd. All rights reserved.}, added-at = {2009-02-13T13:09:53.000+0100}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, affiliation = {Fazio, S (Reprint Author), Univ Bologna, DICASM, Viale Risorgimento 2, I-40136 Bologna, Italy. {[}Fazio, S.] Univ Bologna, DICASM, I-40136 Bologna, Italy. {[}Fazio, S.; Salomoni, A.] Ctr Ceram Bologna, I-40138 Bologna, Italy. {[}Guzman, J.; Colomer, M.; Moreno, R.] CSIC, Inst Ceram \& Vidrio, E-28049 Madrid, Spain.}, author = {Fazio, S. and Guzman, J. and Colomer, M. and Salomoni, A. and Moreno, R.}, author-email = {fazio@cencerbo.it}, biburl = {https://www.bibsonomy.org/bibtex/2c1872205feba9f9edb8ba036a5a24ea9/almailer}, cited-references = {BAE HS, 2003, COLLOID SURFACE A, V220, P169, DOI 10.1016/S0927-7757(03)00077-3. BOISVERT JP, 2001, COLLOID SURFACE A, V178, P187. BUENO S, 2004, J EUR CERAM SOC, V24, P2785, DOI 10.1016/j.jeurceramsoc.2003.08.015. CHEN XB, 1998, POWDER TECHNOL, V99, P171. CHENG P, 2005, PROG CHEM, V17, P8. HIDBER PC, 1996, J AM CERAM SOC, V79, P1857. HORN RG, 1990, J AM CERAM SOC, V73, P1117. KEAR BH, 2001, SCRIPTA MATER, V44, P2065. KOSMULSKI M, 2002, ADV COLLOID INTERFAC, V99, P255. LANGE FF, 1989, J AM CERAM SOC, V72, P3. LEWIS JA, 2000, J AM CERAM SOC, V83, P2341. MORENO R, 1992, AM CERAM SOC BULL, V71, P1521. PARKIN IP, 2005, J MATER CHEM, V15, P1689, DOI 10.1039/b412803f. POLUNINA IA, 1999, COLLOID SURFACE A, V160, P141. SIGMUND WM, 2000, J AM CERAM SOC, V83, P1557. VANDYK AC, 1998, J COLLOID INTERF SCI, V206, P381. VASYLKIV O, 2001, J AM CERAM SOC, V84, P2489. WIDEGREN J, 2002, J AM CERAM SOC, V85, P523.}, description = {Initial Import}, doc-delivery-number = {322BI}, doi = {10.1016/j.jeurceramsoc.2008.02.017}, file = {:Fazio2008.pdf:PDF}, interhash = {b61169885dcb5706d730af27a499ee68}, intrahash = {c1872205feba9f9edb8ba036a5a24ea9}, issn = {0955-2219}, journal = {JOURNAL OF THE EUROPEAN CERAMIC SOCIETY}, journal-iso = {J. Eur. Ceram. Soc.}, keywords = {TiO2; behaviour; colloidal nanopowders; potential zeta}, keywords-plus = {TIO2; DISPERSION; CERAMICS; TECHNOLOGY; ADSORPTION; RUTILE}, language = {English}, number = 11, number-of-cited-references = {18}, owner = {s0346678}, pages = {2171-2176}, publisher = {ELSEVIER SCI LTD}, subject-category = {Materials Science, Ceramics}, times-cited = {0}, timestamp = {2009-02-13T13:09:54.000+0100}, title = {Colloidal stability of nanosized titania aqueous suspensions}, type = {Article}, unique-id = {ISI:000257349800007}, volume = 28, year = 2008 }