The Production of Dispersible Zirconia Nanocrystals: A Recent Patent Review

Author(s): Anthony Shiaw-Tseh Chiang

Journal Name: Recent Innovations in Chemical Engineering
Formerly: Recent Patents on Chemical Engineering

Volume 7 , Issue 2 , 2014

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Graphical Abstract:


Zirconia nanocrystals are the best materials to combine with various resins into a transparent high-index composite. Such composite is crucial for the manipulation or enhancement of light in devices such as Organic-Light-Emitting-Diode (OLED) or Liquid- Crystal-Displays (LCD) that surrounds us today. To make a transparent composite, the nanocrystals have to be small (<10nm), un-agglomerated and fully dispersed in resins. They must also be crystalline to provide a better refractive index. Furthermore, since the index of a composite is determined by the volume fraction of the constituents, a substantial increase can only be achieved with a high zirconia loading, usually more than 50wt%. Consequently, the price of zirconia nanocrystals should not be too expensive compared to that of common resins. This requirement excludes many synthesis methods reported in the scientific literatures that employ delicate chemicals or require elaborate procedures. On the other hand, many simpler and large-scale processes for the production of dispersible zirconia nanocrystals have been patented by different companies. A review of the latest development is presented in this paper. Focus is placed particularly on the size, crystalline phase and the dispersibility of the products, as well as on their associated cost.

Keywords: Dispersion, hydrothermal, sovothermal, nano-composite, nanocrystal, refractive index, zirconia.

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Article Details

Year: 2014
Page: [76 - 95]
Pages: 20
DOI: 10.2174/2405520407666150425003612
Price: $65

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PDF: 17