Nano-to-macroporous TiO2 (anatase) by cold sintering process. Issue 7 (July 2019)

• Record Type: Journal Article
• Authors: Medri, Valentina; Servadei, Francesca; Bendoni, Riccardo; Natali Murri, Annalisa; Vaccari, Angelo; Landi, Elena
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 7(2019)
• Page Start: 2453
• Page End: 2462
• Publication Date: 2019-07
• Subjects: Titanium oxide -- Anatase -- Cold sintering process -- Porous ceramics -- Nanopowders; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.02.047
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Cold Sintering Process (CSP) was applied on commercial nanopowders to produce nanostructured TiO2 anatase with nano-to-macro porosity. Nanoporous TiO2 based materials were obtained by applying CSP at 150 °C and pressures up to 500 MPa on three TiO2 nanopowders with different specific surface area (s.s.a. = 50, 90 and 370 m 2 /g), using water as transient aqueous environment. Although TiO2 is insoluble in water, a density of 68% and s.s.a. = 117 m 2 /g were achieved from the powder with the highest specific surface area. A post annealing process at 500 °C increased the density up to 73% with a s.s.a. = 59 m 2 /g, and the crystallites dimensions passed from 110 Å in the powder to 130 Å in CSP material and 172 Å after post annealing. Finally, macroporosity was produced by using thermoplastic polymer beads as sacrificial templates within TiO2 nanopowder during CSP, followed by a debonding at 500 °C.