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.
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 ﬂuorescence 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.
Applications of ZnO dispersion
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.
- Rubber tires: zinc oxide dispersion for silicon rubber, boots, rubber gloves and other labor products, it can greatly extend the life of the products, and improve their appearance and color. It is irreplaceable in by other traditional carbon black surfactant in the use of clear or colored rubber products. Zinc oxide dispersion can also greatly improve products wear resistance and sealing effect.
- Paint coating: zinc oxide dispersion can make coating with UV shielding to absorb infrared rays and sterilization Antifungal and improve paint with stain resistance, resistance to artificial aging, water-alkali resistance, abrasion resistance, hardness and adhesion, and other traditional mechanical properties.
- Pottery field: ZnO dispersion sinters the temperature which can be reduced 40-60 centigrade in pottery field.
- Fiber and textile: ZnO dispersion effectively protects the fiber and clothes from the ultraviolet radiation and infrared ray.
- Sun proof cosmetic: Zinc Oxide is used in cosmetics primarily as a skin protectant and for UV attenuation. It is ideal for formulating mild or hnypoallergenic sun care products for UVA/UVB protection for babies and people with sensitive skin. Zinc Oxide is available in a wide range of primary particle sizes and varying optical properties. Notwithstanding, zinc oxide is not supplied as individual grains, but as aggregates of primary particles. The degree of aggregation is a function of the primary particle size and manufacturing process, similar to the case with TiO2. These large aggregates may reduce the protection of the formula against UV light, and likewise scatter visible light, increasing whitening when sun care products are applied on skin.
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