Home» ZnO Dispersion (Zinc Oxide Dispersion)
ZnO Dispersion: A stable colloidal dispersion is expected to remain without sedimentation even after prolonged periods of storage. The settling behavior of dispersions depends mainly on the size and density of the dispersed particles. Dispersion of nanopowders into liquids is a challenging task. The high surface area and surface energy which are responsible for the beneficial effects of Nanomaterials cause agglomeration of particles which leads to poor quality dispersions.
Stabilization of metal oxide nanoparticles are extensively studied over the past few years. As a promising semiconductor material, ZnO finds lot of applications in optoelectronic devices, photo catalysts, cosmetics, pigments, paints, ceramics, solar cells, varistors, sensors etc. The properties of ZnO can be tailor made by reducing the size, whereby the specific surface area gets increases which increases the chemical activity.
Zinc oxide in a dispersed form is used in a number of formulations which contain Water. Such formulations include sun screening preparations, cosmetics and veterinary products. The preparation of these formulations is greatly eased if the Zinc oxide is available in the form of an aqueous dispersion which can be readily incorporated into the formulation. However, stable dispersions of Zinc oxide are difficult to prepare and the Zinc oxide may dissolve at low or high pH values.
Zinc Oxide Dispersion
In particular, the unique properties and utility of nanoparticles also arise from a variety of attributes, including the similar size of nanoparticles and biomolecules such as proteins and polynucleic acids. Additionally, nanoparticles can be fashioned with a wide range of metals and semiconductor core materials that impart useful properties such as ?uorescence and magnetic behavior. Moreover, unlike their bulk counterparts, nanoparticles have reduced size associated with high surface/volume ratios that increase as the nanoparticles size decreases. As the particle size decreases to some extent, a large number of constituting atoms can be found around the surface of the particles, which makes the particles highly reactive with prominent physical properties. Nanoparticles of particular materials have unique material properties, hence, manipulation and control of the material properties via mechanistic means is needed.
Dispersing property: Additives can improve the degree of zinc oxide dispersion in a given medium and prevent reagglomeration of the aggregates. A 1-3% addition (in reference to zinc oxide) of polyacrylic acid (sodium salt; MW 2100) performs well for dispersion stabilization in most aqueous systems.
Zinc oxide (ZnO) nanopowders are available as powders and dispersions. These nanodispersions exhibit antibacterial, anti-corrosive, antifungal and UV filtering properties. Zinc is a Block D, Period 4 element while Oxygen is a Block P, Period 2 element. Some of the synonyms of zinc oxide nanoparticles dispersions are oxydatum, zinci oxicum, permanent white, ketozinc and oxozinc.
The zinc oxide dispersions can be used as a UV-absorber, for catalytic applications, electronic applications, production of antifungal or antibacterial materials, sensors, actuators, photovoltaic devices, conductive coatings, among other applications.