Abstract
Molybdenum blue dispersions were synthesized by reducing an acidic molybdate solution with glucose, hydroquinone and ascorbic acid. The influence of the H/Mo molar ratio on the rate of formation of molybdenum particles was established. For each reducing agent, were determined the rate constant and the order of the particle formation and were established the conditions for the formation of aggregative stable dispersion with the maximum concentration of particles. The dispersed phase is represented by toroidal molybdenum oxide nanoclusters, which was confirmed by the results of UV/Vis, FTIR, XPS spectroscopy and DLS.
Highlights
Molybdenum-oxygen nanoclusters represent a large class of polyoxometalates (POM) [1,2,3,4,5]
Disperse phase of molybdenum blue dispersions is presented by giant clusters, which are formed as a result of self-assembly from the original building blocks, which are Mo1, Mo2, Mo8, etc. [13,14,15,16]
It is known that the formation of clusters of molybdenum blue occurs as a result of self-organization of molybdenum complexes [33]
Summary
Molybdenum-oxygen nanoclusters represent a large class of polyoxometalates (POM) [1,2,3,4,5]. POMs, in particular molybdenum oxide nanoclusters, are characterized by a small particle size of the order of 3 nm, are formed spontaneously under certain conditions and have an amazing resistance to the action of electrolytes. By their behavior, dispersions of molybdenum blue are close to micellar solutions of surfactants, classical representatives of associated colloids [8,10,17,18,19]. Polyoxometalates exhibit remarkable physicochemical properties, structural versality and high reactivity. These systems are considered as the most promising precursors for production of hybrid materials, drug delivery systems, nanoreactors and catalytic materials [20,21,22,23]
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