Nanostructured films: on the influence of the architecture on Photoactivity properties of films with phosphotungstate and nanoparticles

• Grant number: 11/08120-0
• Support type: Regular Research Grants
• Duration: April 01, 2012 - August 31, 2014
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal researcher: Ubirajara Pereira Rodrigues Filho
• Grantee: Ubirajara Pereira Rodrigues Filho
• Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

This porposal aims to understand the relationship between chemical composition-strucutre-morphology and photochemical reactivity of nanostrucutred thin films. The photoactive compounds studied are semiconducting oxides (TiO2 and ZnO) and the polyoxometalate phosphotugstate. A second approach is intending to use shell@core TiO2@SiO2 nanoparticles as photoactive element, instead the TiO2 or ZnO. This approach allows us to tune the energy of the border level of the conduction band of the semiconductor by controlling the thickness of the TiO2 shell. Such control is intending to result on higher efficiency of Reactive Oxygen Species generation, such as hydroxyl radical, as well as result on higher photochromic activity. The photoactive compounds are going to be dispersed in two different solid matrix: Ormosils and Electrostactic Layer-by-Layer films. The multilayered films are going to be build by dip coating using poyphoshates are polyeelectrolytes. The photo-reactivity is going to be evaluatyced by recording the photochromic behavior and their photocatalytic activity for degradation of lipids and s-triazines. Their photocatalytic activity is going to be evaluated by studying their photochromic activity and their their photocatalytic activity toward N-Oxide-5,5-Dimethyl-1-Pirroline, methylene blue and violet crystal. These chemicals were chosen due to their recognized reactivity toward OH radicals generated by the photocatalytic species. Moreover, the ormosis photoreactivity is going to be essayed toward s-triazines, melamine and atrazina. New class II hybrid Materials with poly(dimethylsiloxane) and silicate interpenetrating network chemically bonded through urethane bond will be prepared aiming higher mechanical, chemical and photochemical stability as matrices to the photoactive materials, phosphotungstate and TiO2 and ZnO. (AU)

Scientific publications

(11)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GUNTHER, FLORIAN; LIMA, ELTON F. S.; ROSSI DE AGUIAR, KELEN M. F.; BEARZI, JEFFERSON R.; SIMOES, MATEUS B.; SCHNEIDER, RICARDO; BINI, RAFAEL A.; RIBEIRO, SIDNEY J. L.; CHI MAN, MICHEL WONG; RISCHKA, KLAUS; AGUIAR, FLAVIO H. B.; PEREIRA, RENATA; MAINARDI, MARIA DO CARMO A. J.; ROCHA, MARINA C.; MALAVAZI, IRAN; PASSETI, TANIA A.; SANTOS, MARCIO L.; IMASATO, HIDETAKE; RODRIGUES-FILHO, UBIRAJARA PEREIRA. PDMS-urethanesil hybrid multifunctional materials: combining CO2 use and sol-gel processing. Journal of Sol-Gel Science and Technology, v. 95, n. 3, SI AUG 2020. Web of Science Citations: 0.

ROSSI DE AGUIAR, KELEN M. F.; NASCIMENTO, V, MATHEUS; FACCIONI, JULIANO L.; NOESKE, PAUL-LUDWIG M.; GAETJEN, LINDA; RISCHKA, KLAUS; RODRIGUES-FILHO, UBIRAJARA P. Urethanes PDMS-based: Functional hybrid coatings for metallic dental implants. Applied Surface Science, v. 484, p. 1128-1140, AUG 1 2019. Web of Science Citations: 1.

DE AGUIARA, KELEN R.; RISCHKA, KLAUS; GAETJEN, LINDA; NOESKE, PAUL-LUDWIG MICHAEL; CAVALCANTI, WELCHY LEITE; RODRIGUES-FILHO, UBIRAJARA P. Biomimetic PDMS-hydroxyurethane terminated with catecholic moieties for chemical grafting on transition metal oxide-based surfaces. Applied Surface Science, v. 427, n. B, p. 166-175, JAN 1 2018. Web of Science Citations: 3.

DE AGUIAR, K. M. F. ROSSI; FERREIRA-NETO, E. P.; BLUNK, S.; SCHNEIDER, J. F.; PICON, C. A.; LEPIENSKI, C. M.; RISCHKA, K.; RODRIGUES-FILHO, U. P. Hybrid urethanesil coatings for inorganic surfaces produced by isocyanate-free and sol-gel routes: synthesis and characterization. RSC ADVANCES, v. 6, n. 23, p. 19160-19172, 2016. Web of Science Citations: 6.

ROSSI DE AGUIAR, K. M. F.; SPECHT, U.; MAASS, J. F.; SALZ, D.; PICON, C. A.; NOESKE, P. -L. M.; RISCHKA, K.; RODRIGUES-FILHO, U. P. Surface modification by physical treatments on biomedical grade metals to improve adhesion for bonding hybrid non-isocyanate urethanes. RSC ADVANCES, v. 6, n. 53, p. 47203-47211, 2016. Web of Science Citations: 8.

ULLAH, SAJJAD; FERREIRA-NETO, ELIAS P.; PASA, ANDRE A.; ALCANTARA, CARLOS C. J.; ACUNA, JOSE J. S.; BILMES, SARA A.; RICCI, MARIA L. MARTINEZ; LANDERS, RICHARD; FERMINO, TAINA ZAMPIERI; RODRIGUES-FILHO, UBIRAJARA P. Enhanced photocatalytic properties of core@shell SiO2@TiO2 nanoparticles. APPLIED CATALYSIS B-ENVIRONMENTAL, v. 179, p. 333-343, DEC 2015. Web of Science Citations: 64.

GONCALVES, LIDIANE PATRICIA; FERREIRA-NETO, ELIAS PAIVA; ULLAH, SAJJAD; DE SOUZA, LUCIANA VALGAS; ELGUERA YSNAGA, ORLANDO ARMANDO; DOS SANTOS, MOLIRIA VIEIRA; LIMA RIBEIRO, SIDNEY JOSE; RODRIGUES-FILHO, UBIRAJARA PEREIRA. Enhanced photochromic response of ormosil-phosphotungstate nanocomposite coatings doped with TiO2 nanoparticles. Journal of Sol-Gel Science and Technology, v. 76, n. 2, p. 386-394, NOV 2015. Web of Science Citations: 4.

FERREIRA-NETO, ELIAS P.; ULLAH, SAJJAD; DE CARVALHO, FLAVIO L. S.; DE SOUZA, ADRIANO L.; DE OLIVEIRA, JR., MARCOS; SCHNEIDER, JOSE F.; MASCARENHAS, YVONNE P.; JORGE, JR., ALBERTO M.; RODRIGUES-FILHO, UBIRAJARA P. Preparation, characterization and photochromic behavior of phosphotungstic acid-ormosil nanocomposites. Materials Chemistry and Physics, v. 153, p. 410-421, MAR 1 2015. Web of Science Citations: 11.

FERREIRA-NETO, ELIAS PAIVA; ULLAH, SAJJAD; ELGUERA YSNAGA, ORLANDO ARMANDO; RODRIGUES-FILHO, UBIRAJARA PEREIRA. Zn2+ doped ormosil-phosphotungstate hybrid films with enhanced photochromic response. Journal of Sol-Gel Science and Technology, v. 72, n. 2, SI, p. 290-300, NOV 2014. Web of Science Citations: 4.

AGUIAR, K. R.; SANTOS, V. G.; EBERLIN, M. N.; RISCHKA, K.; NOESKE, M.; TREMILIOSI-FILHO, G.; RODRIGUES-FILHO, U. P. Efficient green synthesis of bis(cyclic carbonate) poly(dimethylsiloxane) derivative using CO2 addition: a novel precursor for synthesis of urethanes. RSC ADVANCES, v. 4, n. 46, p. 24334-24343, 2014. Web of Science Citations: 20.

FERREIRA-NETO, ELIAS P.; DE CARVALHO, FLAVIO L. S.; ULLAH, SAJJAD; ZOLDAN, VINICIUS C.; PASA, ANDRE A.; DE SOUZA, ADRIANO LOPES; BATTIROLA, LILIANE C.; RUDOLF, PETRA; ALDABE BILMES, SARA; RODRIGUES-FILHO, UBIRAJARA P. Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils. Journal of Sol-Gel Science and Technology, v. 66, n. 3, p. 363-371, JUN 2013. Web of Science Citations: 9.

Filed patent(s) as a result of this research project