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Photochromic hybrid films on flexible substrate obtained by sol gel process deposited by inkjet printer


The purpose of this project is focused on the synthesis and characterization of photochromic organic-inorganic hybrid (HOI) materials containing tungsten (PWA) and molybdenum polyoxometalates (PMo) by sol gel process on polyethylene terephtalate (PET) flexible substrate by using inkjet technique. Hybrids so-called di and tri-ureasils containing different polymer chain length and concentration of polyoxometalates will be prepared in order to evaluate the effect of these parameters on photochromic properties with potential application in totally flexible devices. Physical chemical parameters such as viscosity and surface tension of the HOI sols and printing conditions such as waveform, drop velocity and also drop spacing will be determined in order to obtain the best printing conditions. In addition, surface treatment by using modified alkoxides (amino, epoxy and fluoralkoxides) will be performed on PET to obtain good wettability between substrate and HOI. (AU)

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Scientific publications (5)
(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)
ESPINDOLA, A.; GONCALVES, N. S.; NALIN, M.; RIBEIRO, S. J. L.; BARUD, H. S.; MOLINA, C. Casting and inkjet printable photochromic films based on polymethylmethacrylate - Phosphotungstic acid. Optical Materials, v. 96, OCT 2019. Web of Science Citations: 0.
CAVALCANTE, C. T.; MOLINA, C.; MARTINS, T. S. Synthesis and characterization of ordered mesoporous silica containing di-ureasil hybrid/phosphotungstic acid and Eu3+. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, v. 30, n. 18, SI, p. 16903-16909, SEP 2019. Web of Science Citations: 0.
SANTOS, THAYS C. F.; RODRIGUES, REBECA R.; CORREIA, SANDRA F. H.; CARLOS, LUIS D.; FERREIRA, RUTE A. S.; MOLINA, CELSO; PERES, LAURA O. UV-converting blue-emitting polyfluorene-based organic-inorganic hybrids for solid state lighting. Polymer, v. 174, p. 109-113, JUN 12 2019. Web of Science Citations: 0.
CRUZ, R. P.; NALIN, M.; RIBEIRO, S. J. L.; MOLINA, C. Photochromic dynamics of organic-inorganic hybrids supported on transparent and flexible recycled PET. Optical Materials, v. 66, p. 297-301, APR 2017. Web of Science Citations: 4.
OBARA, P. A.; SARMENTO, V. H. V.; RIBEIRO, S. J. L.; NALIN, M.; MOLINA, C. PWA-diureasils organic-inorganic hybrids. Photochromism and effect of the organic chain length. Optical Materials, v. 46, p. 64-69, AUG 2015. Web of Science Citations: 3.

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