Facile synthesis of nanostructured cobalt pigments by Co- A zeolite thermal conversion and its application in porcelain manufacture

Abstract

An innovative and facile synthesis of cobalt based inorganic pigment was carried out by means of a low energy thermal conversion of a cobalt-exchanged zeolite. the na-A [LtA] zeolite was used, since it is a low cost and easily available raw material. the ion exchange mechanism allowed to control, at microscopic level, the composition of the zeolitic precursor. Several chromatic effects could be obtained by varying the treatment temperature and/or the cobalt concentration in the contact solution. the reliability of these new zeolite-based pigments was tested in porcelain manufacture, in collaboration with the institute for the Capodimonte porcelain "Giovanni caselli". the developed cobalt pigments were successfully tested either in the porcelain mixture to obtain a coloured product or in the decoration step (such as ingobbio, colored glazes and "third fire decoration").

Synthesis of zeolite‐derived blue nanopigment and its modification for hydrophobic coating on ceramic tile

“…Importantly, these amorphous phases hold potential as precursors for the creation of innovative ceramics tailored to specific properties 1 . Zeolites, whether in their original cationic state or following appropriate pre‐exchange processes, 2,3 have found utility as precursors in ceramic production 4–7 . The application of high‐temperature firing to zeolitic powders induces structural alterations, yielding either amorphous or crystalline ceramics, contingent on their chemical composition.…”

“…This characteristic facilitates the direct fabrication of colored ceramics or powders that mimic ceramic pigments 12,13 . The even dispersion of these additional cations within the zeolite structure guarantees uniform distribution of coloring centers, thereby achieving a consistent and enduring coloration of the ceramic product subsequent to thermal treatment 4 …”

“…1 Zeolites, whether in their original cationic state or following appropriate pre-exchange processes, 2,3 have found utility as precursors in ceramic production. [4][5][6][7] The application of high-temperature firing to zeolitic powders induces structural alterations, yielding either amorphous or crystalline ceramics, contingent on their chemical composition. This unconventional approach to ceramic manufacturing presents notable advantages, as extensively expounded upon in the existing literature.…”

“…12,13 The even dispersion of these additional cations within the zeolite structure guarantees uniform distribution of coloring centers, thereby achieving a consistent and enduring coloration of the ceramic product subsequent to thermal treatment. 4 In the historical context of colorant pigments that have played a crucial role in human history, 14 one of the particularly fascinating examples is the blue pigment obtained by introducing cobalt into zinc silicate, identified as (Co, Zn) 2 SiO 4 or willemite (Zn 2 SiO 4 ). 15 Willemite exhibits an orthosilicate structure characterized by phenacite symmetry, wherein zinc and silicon ions are situated in distinct tetrahedral (Td) framework sites, each with a fourfold crystallographic arrangement.…”

Synthesis, characterization of Co1-xNixAl2O4 Spinel system and catalytic role in the synthesis of dihydropyrimidinone

“…These materials nd their application in the eld of high-density magnetic recording, microwave devices, applications such as plastics coloring and glass coatings, etc. [1][2][3][4][5]6,7]. The unusual magnetic behavior of FCC structure resulting from geometrical frustration makes it a system of great importance as it is an exemplary system possessing degenerate frustrated ground states which are the result of competition between various exchange interactions and further lead to spin-liquid behavior [8][9][10].…”