Interfaces in ceramic processing

• Grant number: 15/50443-1
• Support Opportunities: Regular Research Grants
• Start date: June 01, 2016
• End date: May 31, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Agreement: University of California, Davis (UC Davis)
• Mobility Program: SPRINT - Projetos de pesquisa - Mobilidade
• Principal Investigator: Douglas Gouvêa
• Grantee: Douglas Gouvêa
• Principal researcher abroad: Alexandra Navrotsky
• Institution abroad: University of California, Davis (UC Davis), United States
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 13/23209-2 - Ions segregation onto oxide nanopowders surfaces and the influence on the colloidal processing, AP.R

Abstract

The main difference between nanoparticles and bulk materials is the high fraction of atoms located at the interface region. While this is key for numerous applications, the Gibbs energy is conversely increased by the interface term, such that ∆G = ƴ.∆A, where ƴ is the interface energy and A is the molar surface area), making the small particles highly unstable and prone to grownth to decrease the total energy of the system. Size stabilization is possible when growth is hindered by controlling two main variables: diffusion and interface energy. Therefore, low synthesis temperatures, reduction in the point deffects and low interface energy are possible strategies to stabilize nanoparticles. The association of the calorimetric and surface excess data can give a complete and more general view of the segregation process and consequent energetic modification of oxide nanoparticles. This is key for the development of novel compositions with high stability for applications in agriculture, catalysis for water cleaning, and energy generation. In addition to the scientific goals, this project will bring cultural exchange to benefit UC Davis and USP students and professors by expanding the diversity of thoughts. New breakthroughts are expected by the simple mingle of the diverse team. This project will start a series of discussions and experiments on critical problems regarding nanostability of oxides. Through the exchange of people and ideas, new horizons will be the understanding of nanomaterials. In practical terms, we will seek larger funding opportunities, such as the National Science Foundation - World Materials Network, to grow this collaboration in a more solid program. (AU)

Scientific publications

(10)

(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)

GOUVEA, DOUGLAS; DO ROSARIO, DEISE C. C.; CALIMAN, LORENA B.. Surface and grain-boundary excess of ZnO-doped SnO2 nanopowders by the selective lixiviation method. Journal of the American Ceramic Society, v. 100, n. 9, p. 4331-4340, SEP 2017. (13/23209-2, 15/50443-1)

DA SILVA, ANDRE L.; MUCHE, DERECK N. F.; CALIMAN, LORENA B.; BETTINI, JEFFERSON; CASTRO, RICARDO H. R.; NAVROTSKY, ALEXANDRA; GOUVEA, DOUGLAS. TiO2 Surface Engineering to Improve Nanostability: The Role of Interface Segregation. Journal of Physical Chemistry C, v. 123, n. 8, p. 4949-4960, FEB 28 2019. (13/23209-2, 15/50443-1)

BERNARDES, ANDRE A.; CALIMAN, LORENA B.; DA SILVA, ANDRE L.; BETTINI, JEFFERSON; GUIMARAES, KLEBER L.; GOUVEA, DOUGLAS. Li2O-doped MgAl2O4 nanopowders: Energetics of interface segregation. Journal of the American Ceramic Society, v. 103, n. 4, DEC 2019. (13/23209-2, 14/50279-4, 15/50443-1)

MUCHE, DERECK N. F.; DA SILVA, ANDRE L.; NAKAJIMA, KIMIKO; GOUVEA, DOUGLAS; CASTRO, RICARDO H. R.. Simultaneous segregation of lanthanum to surfaces and grain boundaries in MgAl2O4 nanocrystals. Applied Surface Science, v. 529, NOV 1 2020. (15/50443-1, 13/23209-2)

DA SILVA, ANDRE LUIZ; WU, LILI; CALIMAN, LORENA BATISTA; CASTRO, RICARDO H. R.; NAVROTSKY, ALEXANDRA; GOUVEA, DOUGLAS. Energetics of CO(2)and H2O adsorption on alkaline earth metal doped TiO2. Physical Chemistry Chemical Physics, v. 22, n. 27, p. 15600-15607, JUL 21 2020. (13/23209-2, 15/50443-1, 14/50279-4)

DE OLIVEIRA, RAPHAEL A. M. P.; DA SILVA, ANDRE L.; CALIMAN, LORENA B.; GOUVEA, DOUGLAS. Interface excess on Li2O-doped gamma-Al2O3 nanoparticles. CERAMICS INTERNATIONAL, v. 46, n. 8, p. 6-pg., 2020-06-01. (13/23209-2, 15/50443-1)

DE OLIVEIRA, RAPHAEL A. M. P.; DA SILVA, ANDRE L.; CALIMAN, LORENA B.; GOUVEA, DOUGLAS. Interface excess on Li2O-doped gamma-Al2O3 nanoparticles. CERAMICS INTERNATIONAL, v. 46, n. 8, A, p. 10555-10560, JUN 1 2020. (15/50443-1, 13/23209-2)

NEVES, DEBORA C. O. S.; DA SILVA, ANDRE L.; DE OLIVEIRA ROMANO, ROBERTO CESAR; GOUVEA, DOUGLAS. Fe2O3-doped SnO2 membranes with enhanced mechanical resistance for ultrafiltration application. Journal of the European Ceramic Society, v. 40, n. 15, p. 5959-5966, DEC 2020. (15/50443-1, 13/23209-2)

CALIMAN, L. B.; MUCHE, D.; SILVA, A.; OSPINA, C. A. R.; MACHADO, I. F.; CASTRO, R. H. R.; GOUVEA, D.. Effect of segregation on particle size stability and SPS sintering of Li2O-Doped magnesium aluminate spinel. Journal of the European Ceramic Society, v. 39, n. 10, p. 3213-3220, AUG 2019. (13/23209-2, 15/50443-1)

GANDELMAN, HENRY; DA SILVA, ANDRE L.; CALIMAN, LORENA BATISTA; GOUVEA, DOUGLAS. Surface and grain boundary excess of ZnO-doped TiO2 anatase nanopowders. CERAMICS INTERNATIONAL, v. 44, n. 10, p. 11390-11396, JUL 2018. (13/23209-2, 15/50443-1)