Ions segregation onto oxide nanopowders surfaces and the influence on the colloidal processing

• Grant number: 13/23209-2
• Support Opportunities: Regular Research Grants
• Start date: June 01, 2014
• End date: May 31, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Douglas Gouvêa
• Grantee: Douglas Gouvêa
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant(s): 15/50443-1 - Interfaces in ceramic processing, AP.R SPRINT

Abstract

The phenomena related to oxide nanoparticles are entirely related to their surfaces . Taking into account that an oxide particles with average size of 5 nm is about 60 % of the atoms on the surface, the general properties could be associated with its surfaces. Colloidal properties are directly related to the chemical composition of the surface and its reaction to the solvent . The study nanomaterial properties by understanding the physical and chemical behavior of surfaces is one of the most promising path to establish the relationship between surface composition and its relation to the stability of particles and colloidal stability of dispersions . This proposal focuses on the study of the phenomena of segregation of additives (cations and anions) at the interfaces of nanomaterials associating the electrokinetic behavior of nanoparticles by measuring the zeta potential and selective solubility of additives in a matrix of an insoluble oxide . The selective solubility is determined by the technique of ion chromatography in colloidal dispersions of oxide nanoparticles prepared by the polymeric precursor technique. The subject has been studied in recent decades by the LPC group and its main intention quantify segregation for understanding the growth of nanoparticles and the stability of crystalline phases as well as their relation to the surface energy . (AU)

Scientific publications

(12)

(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)

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)

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)

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)

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)

CAMARGO, M. T. T.; JACQUES, Q.; CALIMAN, L. B.; MIAGAVA, J.; HOTZA, D.; CASTRO, R. H. R.; GOUVEA, D.. Synthesis of Ca-doped spinel by Ultrasonic Spray Pyrolysis. Materials Letters, v. 171, p. 232-235, MAY 15 2016. (13/23209-2)

D. GOUVÊA; B. H. VIANA; J. MIAGAVA. Segregação superficial de MgO em nanopartículas de TiO2. Cerâmica, v. 62, n. 364, p. 400-404, 2016-12-00. (13/23134-2, 13/23209-2)

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)

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)

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)