Pigments based on Cr and Sb doped TiO 2 prepared by microemulsion-mediated solvothermal synthesis for inkjet printing on ceramics

Abstract

Nanoparticles of the ceramic pigment with composition Ti 0.97 Cr 0.015 Sb 0.015 O 2 were prepared by microemulsion-mediated solvothermal method at 180 ºC. Anatase or rutile single phase was obtained depending on the synthesis conditions. Scanning electron microscope analysis showed the formation of nanospheres with particle size around 600 nm. The anatase to rutile transformation temperature was determined by Raman spectroscopy. The evolution of the colour was studied, and it was related with the polymorphic transition. Yellow nanopigments were obtained at low temperature and huge orange colour was observed at high temperature. Nanopigments prepared at 180 ºC were tested with an industrial frit. Similar chromatic coordinates of an industrial orange ceramic pigment obtained at high temperatures were observed. -potential values of the nanoparticles were  -57 mV. The size, shape, colour and electrostatic stability of these nanoparticles make them potential candidates to be applied in glazes or inkjet printers as orange ceramic pigments.

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

“…69) [430,431]. First-principle calculations showed the appearance of new energy levels in the band gap, which is in agreement with the experimentally observed decrease of apparent band gap and coloration of TiO 2 [432,433]. Based on the enhanced absorption in the visible spectrum thus one may expect that transition metal doped TiO 2 materials in general have better photocatalytic activity than the corresponding pristine TiO 2 .…”

Cr- and Sb-containing TiO 2 inorganic orange nano-pigments prepared by a relative long hydrocarbon chain polyol

“…Thus, Jovani et al prepared Cr 0.015 Sb 0.0015 Ti 0.97 O 2 by a microemulsion-mediated solvothermal via and tested its potential use for inkjet printing on ceramics (10) Taking into account both the current basic knowledge on the Cr-and Sb-codoped TiO 2 ceramic pigmenting system and the actual industrial need of availability of nanopigments, there are still some issues in the Cr,Sb-codoped TiO 2 nano-pigments subject that need further research. Thus, it seems interesting to search the feasibility of using as solvent relatively long hydrocarbon chain polyols and the structural and spectroscopic properties of the prepared nano-pigments in a wide range of compositions, i. e. with greater dopant loads, as well as the dependence of the chromatic coordinates on both the content of dopants and the crystallite size of the nanoparticles.…”

Characteristics of pigments, modification, and their functionalities

“…138 Various methods employed in pigment modification include microemulsion synthesis, self-assembling, mechanochemical processing, spray pyrolysis and drying, thermal decomposition of organic precursor, sol-gel technique, supercritical-water processing, hydrothermal processing, sonochemical or microwave-assisted synthesis, direct/homogeneous precipitation, and co-precipitation. 10,45,[141][142][143][144][145][146][147] In addition, some pigments and their method of surface modification undertaken by researchers have been tabulated in Table 3.…”