Synthesis and thermal stability of ZrO₂@SiO₂ core–shell submicron particles

Abstract

Silica encapsulation dramatically enhances the thermal stability of zirconia submicron particles by grain growth inhibition and tetragonal phase stabilization.

Influence of restorative material translucency on the chameleon effect

“…The refractive indices of these monomers fall in the range of 1.49–1.56 29 . The conventional and flowable resin composites also share the same fillers: non-aggregated silica (refractive index 1.47), zirconia (refractive index 2.15) 30 , and aggregated silica-zirconia clusters. However the flowable resin composite has larger silica particles (75 nm, compared to 20 nm for conventional resin composite) and a smaller total amount of fillers (65% by weight or 55% by volume, compared to 78.5% by weight or 63.3% by volume for conventional resin composite).…”

Surface Modification of ZrO2 Nanoparticles with TEOS to Prepare Transparent ZrO2@SiO2-PDMS Nanocomposite Films with Adjustable Refractive Indices

“…In addition to the surface modification of ZrO 2 with organic materials, Vossmeyer et al and Xu et al reported the surface modification of ZrO 2 with inorganic materials, such as SiO 2 . However, they did not show the fabrication of transparent nanocomposite films [21,22]. To the best of our knowledge, there have been no reports on the fabrication of transparent nanocomposite film with adjustable refractive indices utilizing ZrO 2 NPs surface-modified with only a SiO 2 layer.…”

“…The agglomerate formation in NPs can cause strong light scattering [14]. Several studies have reported methods for the strengthening of chemical affinity or for the conforming of stable chemical bonds between NPs and polymers to avoid agglomeration [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

“…Due to their high refractive index and transparency in the visible region, ZrO 2 NPs have been used in the development of transparent nanocomposite films with high refractive indices [25][26][27][28][29]. Many studies investigating the surface modification of ZrO 2 with organic molecules or polymers in order to avoid ZrO 2 agglomeration and achieve stable dispersion in the polymer matrix have been published [21][22][23][24][25][26][27][28][29]. A typical example of such materials is a commercial product from Pixelligent Technologies LLC (Baltimore, MD, USA) that uses ZrO 2 NPs 5-20 nm in size functionalized with organic molecules.…”

Encapsulation of Metal Nanoparticles (MNPs) as Catalyst

“…In addition, it has significant heat stability that is suitable for a high thermal catalytic reaction to encapsulate and support the MNPs. Although it has low thermal conductivity and is utilized Encapsulation of Metal Nanoparticles (MNPs) as Catalyst DOI: http://dx.doi.org/10.5772/intechopen.103184 as thermal barrier coatings, it has a high refractive index, which is well-suited for various optical applications [34].…”