[en] Surface charging mechanism of YBa2Cu3O7-x (YBCO) particles in water has been investigated in order to understand their colloidal behaviour and stabilise concentrated suspensions. A broad study relating the suspension parameters (pH and zeta potential) vs. the conditions of the suspension performance (atmosphere and time) has been shown and discussed. The zeta potential values remain positive in all the pH range for the highest powder concentration studied (10 g l(-1)), evidencing a large influence of the solid content in the particle charge. The chemistry of YBa2Cu3O7-x in water has been studied through the chemical analysis of the supernatant by inductively coupled plasma (ICP), and the surface analysis of the particles by X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS). The presence of BaCO3, CuO, and the hydrolysed Ba species, such as Ba(OH)(2) and Ba(OH)(+), at the particles surface has been evaluated as a function of the powder concentration. Based on these analyses, the dependence of the colloidal behaviour of YBCO on the presence of Ba soluble species has been determined. A stabilisation mechanism for YBCO particles in aqueous suspension focus on the powders deleterious minimization was proposed. (C) 2009 Elsevier B.V. All rights reserved.
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Dusoulier, Laurent; Royal Military Academy, Brussels, Belgium > CISS Department
Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale - Doyen de la Faculté des Sciences
Vertruyen, Bénédicte ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Garcia-Fierro, Jose L; Instituto de Catálisis y Petroquímica, CSIC, Madrid, Spain
Moreno, Rodrigo; Instituto de Cerámica y Vidrio, CSIC, Madrid, Spain
Ferrari, Begona; Instituto de Cerámica y Vidrio, CSIC, Madrid, Spain
Language :
English
Title :
Interactions in YBa2Cu3O7-x aqueous suspensions
Publication date :
2009
Journal title :
Materials Chemistry and Physics
ISSN :
0254-0584
eISSN :
1879-3312
Publisher :
Elsevier Science
Volume :
116
Issue :
2-3
Pages :
368-375
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Interuniversity Attraction Pole INANOMAT (P6/17)
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique Spanish Science and Education Ministry