Porcelain containing anatase and rutile nanocrystals

Bouzidi, Nedjima; Bouzidi, A.; Gaudon, Pierre; Merabet, Djoudi; Blanchart, Philippe

doi:10.1016/j.ceramint.2012.06.053

Cited by 15 publications

(10 citation statements)

References 23 publications

(30 reference statements)

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“…On the other hand, the mullite formation encapsulates and isolates sub-micron rutile crystals due to the very limited rutile reaction with mullite. The formation of elongated mullite crystals and the presence of rutile phase are confirmed by the results of Bouzidi et al 30 and Hong and Messing. 31 They found that titania-doped mullite samples contained both equiaxial and elongated grains.…”

Section: Resultssupporting

confidence: 72%

Novel porous Al₂O₃-SiO₂-TiO₂bone grafting materials: Formation and characterization

et al. 2013

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The present article deals with the development of 3D porous scaffolds for bone grafting. They were prepared based on rapid fluid infiltration of Al 2 O 3 -SiO 2 sol into a polyethylene non-woven fabric template structure. Titanium dioxide in concentration equal to 5 wt% was added to the Al 2 O 3 -SiO 2 mixture to produce Al 2 O 3 -SiO 2 -TiO 2 composite scaffolds. The prepared scaffolds are characterized by means of X-ray diffraction, scanning electron microscopy and three-point bending test techniques. The bioactivity of the produced bodies is discussed, including the in vitro and in vivo assessments. The produced scaffolds exhibit mean total porosity of 66.0% and three-point bending strength of 7.1 MPa. In vitro studies showed that MG-63 osteoblast-like cells attach and spread on the scaffolds surfaces. Furthermore, cells grew through the scaffolds and start to produce extra-cellular matrix. Additionally, in vivo studies revealed the ability of the porous scaffolds to regenerate bone tissue in femur defects of albino rats 5 months post surgery. Histological analysis showed that the defect is almost entirely filled with new bone. The formed bone is characterized as a mature bone. The produced bone grafts are intended to be used as bone substitute or bone filler as their degradation products caused no inflammatory effects.

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Section: Resultssupporting

confidence: 72%

Novel porous Al₂O₃-SiO₂-TiO₂bone grafting materials: Formation and characterization

et al. 2013

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“…39% of the by-products are considered as siliceous coarse sand and can be used in the field of glass as reinforced glass fiber. 20 The rest of the by-products (41 wt%) are considered as fine sands divided in two grades Bp1 and Bp2. Refractory material used in this study is obtained by mixing 30 wt% of Bp1 and 70 wt% of kaolin marketable product named MK1.…”

Section: Methodsmentioning

confidence: 99%

“…Whereas quartz and mullite grains are clearly visible since they do not enter in solution in the glassy matrix. 28 The microstructure of the refractory fired at 1200 o C shows pores surrounded by amorphous phases (Fig. 6a).…”

Section: Xrd and Microstructure Of Refractory Materialsmentioning

confidence: 99%

“…4) besides glassy and quartz phases ( r = 7 and 5.4 respectively). 28 The increased permittivity is obtained by natural encapsulation of anatase nanocrystals 18,28 within phyllosilicate layers in the raw materials (TiO 2 = 0.40 wt%).…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…The samples fired at 1400 o C have larger dielectric losses, which are probably due to pores, which exhibit a significant relaxation process in the 10 5 -10 6 Hz interval. 28 Besides, the boundaries between mullite crystals are considered to be the paths that allow dissipation of current from the sample. 34,35 Longer mean-free paths are formed by bigger mullite crystals.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

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Mechanical and Dielectric Properties of High Temperature Coating Insulators Based on By-Product of Algerian Kaolin

Bouzidi

Bouguermouh

et al. 2014

Transactions of the Indian Ceramic Society

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The main objective of this work is to study the mechanical and dielectric properties of high temperature coating insulators based on the by-product resulted from the raw kaolin treatment; this by-product represents about 21 wt% of the kaolin as commercial products. During sintering, the mineralogical phases are mainly mullite, quartz and vitreous silica besides rutile phase which is identified only at 1200 o and 1500 o C. The sample porosity decreases from 21% to 16%. Mechanical properties carried out by Young's modulus values are enhanced during calcinations from 54 to 57 GPa. Dielectric properties, in the frequency range of 10 5 -10 9 Hz, of the samples fired at 1400 o and 1500 o C show that they can be considered as insulators since they exhibit a high relative permittivity ( exp ) varying from 6.95 to 7.89 respectively. These parameters depend on glassy, quartz and mullite phases besides porous structures. Porosity affects considerably both the corrected relative permittivity ( c ) considering the large difference between  exp ,  c and the dielectric loss of the samples.

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Effect of chemico‐mineralogical composition on color of natural and calcined kaolins

Bouzidi

Aissou

Concha-Lozano

et al. 2013

Color Research & Application

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A total of six washed French and Algerian kaolins were studied. Kaolinite, halloysite, muscovite, feldspars, anatase, rutile, gibbsite, goethite, and todorokite were present. The thermal behavior of the samples was studied and the transformation heats were determined and quantified by differential thermal analysis. Calcined samples from 900°C to 1400°C are studied by X‐ray diffraction, the results show that the crystallite sizes of mullite rises as the temperature rises. The calcined samples showed an inverse correlation of L* and the crystallite sizes of mullite due to the incorporation of chromophore elements (Fe3+, Ti4+, and Mn2+) in its structure. Muscovite and rutile phases decreased lightness and increased chromaticity. The reduction state of Fe3+/Fe2+ and Mn4+/Mn2+ at 1400°C enhanced lightness leading to the diminution of the b* parameter. The CIELAB color parameters were significantly affected with mineralogy and chemical compositions of the samples. Lightness of the natural kaolins is decreased (L* < 59) when organic matters beside manganese and iron oxides are present. L* was not affected when only iron (Fe2+) is present in the kaolin; however, the chromaticity is increased (b* > 22). Whiteness and tint indices (W10, Tw,10) revealed that only one kaolin could be considered white (limits of CIE Colorimetry, 1986), though upon calcination, this number is enhanced to two. © 2013 Wiley Periodicals, Inc. Col Res Appl, 39, 499–505, 2014

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Porcelain containing anatase and rutile nanocrystals

Cited by 15 publications

References 23 publications

Novel porous Al₂O₃-SiO₂-TiO₂bone grafting materials: Formation and characterization

Novel porous Al₂O₃-SiO₂-TiO₂bone grafting materials: Formation and characterization

Mechanical and Dielectric Properties of High Temperature Coating Insulators Based on By-Product of Algerian Kaolin

Effect of chemico‐mineralogical composition on color of natural and calcined kaolins

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Porcelain containing anatase and rutile nanocrystals

Cited by 15 publications

References 23 publications

Novel porous Al2O3-SiO2-TiO2bone grafting materials: Formation and characterization

Novel porous Al2O3-SiO2-TiO2bone grafting materials: Formation and characterization

Mechanical and Dielectric Properties of High Temperature Coating Insulators Based on By-Product of Algerian Kaolin

Effect of chemico‐mineralogical composition on color of natural and calcined kaolins

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Novel porous Al₂O₃-SiO₂-TiO₂bone grafting materials: Formation and characterization

Novel porous Al₂O₃-SiO₂-TiO₂bone grafting materials: Formation and characterization