Formation and Coloring Mechanism of Typical Aluminosilicate Clay Minerals for CoAl2O4 Hybrid Pigment Preparation

Abstract

Different kinds of aluminosilicate minerals were employed to fabricate CoAl2O4 hybrid pigment for studying its formation and coloring mechanism. It revealed that the color of the obtained hybrid pigments was determined by the content of Al2O3 and lightness of clay minerals. The higher the Al2O3 content and the lightness of clay minerals, the better the color parameters of hybrid pigments. During the preparation of hybrid pigments, CoAl2O4 nanoparticles were confined to be loaded on the surface of the aluminosilicate minerals, which effectively prevented from the aggregation and the size increase of CoAl2O4 nanoparticles. What's more, aluminosilicate mineral might be an ideal natural aluminum source to compensate the aluminum loss due to the dissolution of Al(OH)3 at alkaline medium during precursor preparation, keeping an optimum molar ratio of Co2+/Al3+ for formation of spinel CoAl2O4 pigments in the process of high-temperature crystallization.

Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds

“…For the intercalation compounds, some obvious characteristic peaks such as the band at 1,388 and 1,468 cm −1 belong to the C-H bending mode of -CH 3 and -CH 2 , respectively. A new vibration band at 3,334 cm −1 was observed which is due to the stretching mode of the N-H stretching vibration (Griffiths and De Haseth, 2007 ; Zhang et al, 2018 ). The new vibration band at 2,956 cm −1 was observed and usually assigned to the C-H asymmetric stretching band of the terminal methyl groups (Cheng et al, 2016 ).…”

Development of a β-LiAlSi2O6:Cr-based Ceramic Pigment by Proteic Sol-Gel Process Using Gelatin: Synthesis and Characterization

“…The production of pigments based on the structure of silicates and aluminosilicates as novel raw material alternatives has increased significantly [6][7][8][9] , mainly due to its high availability, in contrast to others scarce materials. Among the materials capable of forming ceramic pigments is LiAlSi 2 O 6 (spodumene), which is a mineral of importance in the extraction of lithium and has also been obtained synthetically for several applications [10][11][12][13][14][15] .…”

Optimal Synthesis of Environment-Friendly Iron Red Pigment from Natural Nanostructured Clay Minerals

“…Based on natural silicate clay minerals, some high-performance pigments have also been synthesized [ 9 ]. The incorporation of natural clay minerals into the pigments effectively reduced the production cost, avoided the agglomeration of chromophores, and improved significantly the stability and applicability of pigments [ 10 , 11 ].…”

“…In other words, the same types of functional composites prepared from different types of clay minerals may have different structures and properties. For example, in the preparation process of clay mineral-supported nanocomposites such as hybrid materials [ 10 , 11 , 16 , 17 ], catalysts [ 18 , 19 ], or composite adsorbents [ 20 , 21 , 22 , 23 , 24 ], the metal ions were firstly deposited on the surface of clay minerals by electrostatic attraction, ion-exchange, chemical complexing or other interactions, and subsequently the precursors were treated by heating or hydrothermal process to generate final products. The formation of precursors and final products is highly dependent on the surface charges and activity of surface groups, so that the types of clay minerals would have great influence on the properties of products.…”