Rheological and optical properties in systems containing TiO2 nanoparticles
In order to follow the sol-gel transition in systems containing TiO2 nanoparticles rheological and optical measurements were performed. Samples were prepared adding titanium(IV) butoxide (hydrolysis and condensation processes) to water/AOT/isooctane microemulsions. We prepared different systems at c...
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todo:paper_09277757_v183-185_n_p595_Romano2023-10-03T15:47:06Z Rheological and optical properties in systems containing TiO2 nanoparticles Romano, S.D Acosta, E.O Dürrschmidt, T. Kurlat, D.H Kerr effect Light scattering Rheology Sol-gel transition TiO2 nanoparticles Condensation Hydrolysis Light scattering Microemulsions Nanostructured materials Rheology Sol-gels Tungsten compounds Viscoelasticity Water Optical measurements Titanium oxides nanoparticle titanium dioxide article energy flow kinetics gel hydrolysis light scattering microemulsion phase transition physical phase polymerization priority journal viscosity In order to follow the sol-gel transition in systems containing TiO2 nanoparticles rheological and optical measurements were performed. Samples were prepared adding titanium(IV) butoxide (hydrolysis and condensation processes) to water/AOT/isooctane microemulsions. We prepared different systems at constant Wo=[H2O]/[AOT] while varying R=[H2O]/[Ti(BuO)4] to study the behaviour of viscoelastic parameters (G′, G′′ and η*) as a function of time at different frequencies as well as to analyse the Kerr constant (B) as a function of R. This work discusses the application of different theoretical approaches: scaling theory, 'fractal growth model' and 'nearly linear growth model'. These experiments were complemented with light scattering measurements. Either static and dynamic optical determinations show an abrupt increase in the size of scattering particles. A significant increase in B values was observed for concentrations below gelification point when they were compared with those determined by light scattering. Copyright © 2001 Elsevier Science B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09277757_v183-185_n_p595_Romano |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Kerr effect Light scattering Rheology Sol-gel transition TiO2 nanoparticles Condensation Hydrolysis Light scattering Microemulsions Nanostructured materials Rheology Sol-gels Tungsten compounds Viscoelasticity Water Optical measurements Titanium oxides nanoparticle titanium dioxide article energy flow kinetics gel hydrolysis light scattering microemulsion phase transition physical phase polymerization priority journal viscosity |
| spellingShingle |
Kerr effect Light scattering Rheology Sol-gel transition TiO2 nanoparticles Condensation Hydrolysis Light scattering Microemulsions Nanostructured materials Rheology Sol-gels Tungsten compounds Viscoelasticity Water Optical measurements Titanium oxides nanoparticle titanium dioxide article energy flow kinetics gel hydrolysis light scattering microemulsion phase transition physical phase polymerization priority journal viscosity Romano, S.D Acosta, E.O Dürrschmidt, T. Kurlat, D.H Rheological and optical properties in systems containing TiO2 nanoparticles |
| topic_facet |
Kerr effect Light scattering Rheology Sol-gel transition TiO2 nanoparticles Condensation Hydrolysis Light scattering Microemulsions Nanostructured materials Rheology Sol-gels Tungsten compounds Viscoelasticity Water Optical measurements Titanium oxides nanoparticle titanium dioxide article energy flow kinetics gel hydrolysis light scattering microemulsion phase transition physical phase polymerization priority journal viscosity |
| description |
In order to follow the sol-gel transition in systems containing TiO2 nanoparticles rheological and optical measurements were performed. Samples were prepared adding titanium(IV) butoxide (hydrolysis and condensation processes) to water/AOT/isooctane microemulsions. We prepared different systems at constant Wo=[H2O]/[AOT] while varying R=[H2O]/[Ti(BuO)4] to study the behaviour of viscoelastic parameters (G′, G′′ and η*) as a function of time at different frequencies as well as to analyse the Kerr constant (B) as a function of R. This work discusses the application of different theoretical approaches: scaling theory, 'fractal growth model' and 'nearly linear growth model'. These experiments were complemented with light scattering measurements. Either static and dynamic optical determinations show an abrupt increase in the size of scattering particles. A significant increase in B values was observed for concentrations below gelification point when they were compared with those determined by light scattering. Copyright © 2001 Elsevier Science B.V. |
| format |
JOUR |
| author |
Romano, S.D Acosta, E.O Dürrschmidt, T. Kurlat, D.H |
| author_facet |
Romano, S.D Acosta, E.O Dürrschmidt, T. Kurlat, D.H |
| author_sort |
Romano, S.D |
| title |
Rheological and optical properties in systems containing TiO2 nanoparticles |
| title_short |
Rheological and optical properties in systems containing TiO2 nanoparticles |
| title_full |
Rheological and optical properties in systems containing TiO2 nanoparticles |
| title_fullStr |
Rheological and optical properties in systems containing TiO2 nanoparticles |
| title_full_unstemmed |
Rheological and optical properties in systems containing TiO2 nanoparticles |
| title_sort |
rheological and optical properties in systems containing tio2 nanoparticles |
| url |
http://hdl.handle.net/20.500.12110/paper_09277757_v183-185_n_p595_Romano |
| work_keys_str_mv |
AT romanosd rheologicalandopticalpropertiesinsystemscontainingtio2nanoparticles AT acostaeo rheologicalandopticalpropertiesinsystemscontainingtio2nanoparticles AT durrschmidtt rheologicalandopticalpropertiesinsystemscontainingtio2nanoparticles AT kurlatdh rheologicalandopticalpropertiesinsystemscontainingtio2nanoparticles |
| _version_ |
1807316146699894784 |