Effect of silica, titanium dioxide, and aluminum oxide impurities on the properties and phase composition of zirconium materials stabilized with cerium dioxide

Refractories ◽  
1964 ◽  
Vol 5 (11-12) ◽  
pp. 551-558
Author(s):  
G. Mandal ◽  
N. A. Godina ◽  
�. K. Keler
Keyword(s):  
Titanium Dioxide ◽  
Phase Composition ◽  
Aluminum Oxide ◽  
Cerium Dioxide

scholarly journals Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 112
Author(s):  
Tamás Gyulavári ◽  
Kata Kovács ◽  
Klára Magyari ◽  
Kornélia Baán ◽  
Anna Szabó ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Anatase Phase ◽  
Hollow Spheres ◽  
Rutile Phase ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Carbonate Species ◽  
Determining Factor

Carbon spheres were applied as templates to synthesize titanium dioxide hollow spheres. The templates were purified with either ethanol or acetone, and the effects of this treatment on the properties of the resulting titania were investigated. The photocatalytic activity of the catalysts was measured via the decomposition of phenol model pollutant under visible light irradiation. It was found that the solvent used for the purification of the carbon spheres had a surprisingly large impact on the crystal phase composition, morphology, and photocatalytic activity. Using ethanol resulted in a predominantly rutile phase titanium dioxide with regular morphology and higher photocatalytic activity (r0,phenol = 3.9 × 10−9 M∙s−1) than that containing mainly anatase phase prepared using acetone (r0,phenol = 1.2 × 10−9 M∙s−1), surpassing the photocatalytic activity of all investigated references. Based on infrared spectroscopy measurements, it was found that the carbon sphere templates had different surface properties that could result in the appearance of carbonate species in the titania lattice. The presence or absence of these species was found to be the determining factor in the development of the titania’s properties.

INFLUENCE OF MORPHOLOGY, PHASE COMPOSITION AND CONTENT OF ALUMINUM OXIDE PARTICLES ON RHEOLOGICAL PROPERTIES OF AQUEOUS SUSPENSIONS BASED ON THEM

2021 ◽  
pp. 14-25
Author(s):  
V.A. Voronov ◽  
◽  
A.S. Chainikova ◽  
Yu.E. Lebedeva ◽  
D.M. Tkalenko ◽  
...  
Keyword(s):  
Phase Composition ◽  
Aluminum Oxide ◽  
Aggregate Stability ◽  
Plasma Chemical ◽  
Buffer Solution ◽  
Sedimentation Stability ◽  
Aqueous Suspensions ◽  
Oxide Powders ◽  
Ceramic Samples ◽  
Oxide Particles

This work investigated the chemical and phase composition of aluminum oxide powders obtained by various methods (alkoxide, codeposition, thermal and plasma-chemical). The physicomechanical, thermophysical and thermal properties of ceramic samples based on them have been determined. The effect of the nature of the aluminum oxide powder and the production process parameters on the sedimentation stability of aqueous suspensions based on them has been determined. The influence of the content of particles of aluminum oxide, buffer solution and rheological additives on the viscosity, sedimentation and aggregate stability of aqueous suspensions has been determined.

Enhanced antibacterial activity of anodic aluminum oxide membranes embedded with nano-silver-titanium dioxide

2017 ◽  
Vol 32 (8) ◽  
pp. 874-888 ◽  
Author(s):  
Raad S. Sabry ◽  
Anwar H. Ali Al-fouadi ◽  
Hamed Kadhim Habool
Keyword(s):  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Nano Silver ◽  
Anodic Aluminum ◽  
Oxide Membranes

Effect of TiO2 on Mechanical Properties and Microstructure of Magnesium Aluminate Spinel Refractories

2011 ◽  
Vol 284-286 ◽  
pp. 638-641
Author(s):  
Jun Cong Wei ◽  
Xiao Cui Han ◽  
Chun Hui Gao ◽  
Jian Kun Huang ◽  
Jun Bo Tu
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Titanium Dioxide ◽  
Phase Composition ◽  
High Temperature ◽  
Physical Properties ◽  
Room Temperature ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel

MgO-Al2O3-TiO2 composite refractories were prepared by using magnesium aluminate spinel (MgAl2O4) and titanium dioxide as main starting materials and being sintered at high temperature. The influences of titanium dioxide additions on the room temperature physical properties, phase composition and microstructure were investigated. The phase composition and microstructure were tested by means of XRD and SEM. The results revealed that with increasing TiO2 content, the densification of the composites first increased sand then decreased and maximized at 4% TiO2 loading. This showed appropriate amount of TiO2 could contribute to the sintering of the composites due to the solid solution of TiO2 in magnesium aluminate spinel.

Solid Solution of Titanium Dioxide in Aluminum Oxide

1966 ◽  
Vol 49 (12) ◽  
pp. 634-637 ◽  
Author(s):  
E. R. WINKLER ◽  
J. F. SARVER ◽  
IVAN B. CUTLER
Keyword(s):  
Solid Solution ◽  
Titanium Dioxide ◽  
Aluminum Oxide

scholarly journals Features of the structure and phase composition of materials based on aluminum oxide and chromium borides obtained under conditions of SHS and free SHS compression

2020 ◽  
Vol 10 (2) ◽  
pp. 135-140
Author(s):  
Andrey Chizhikov ◽  
Pavel Bazhin ◽  
Alexander Stolin
Keyword(s):  
Phase Composition ◽  
Aluminum Oxide

scholarly journals THEORETIC AND EXPERIMENTAL SUBSTANTIATION OF A COMPOSITION OF A CREAM WITH CERIUM DIOXIDE NANOPARTICLES

2019 ◽  
Vol 15 (1-2) ◽  
pp. 3-11
Author(s):  
G.V. Zaychenko ◽  
M.O. Liapunov ◽  
V.S. Iefanov ◽  
O.P. Bezuhla ◽  
A.M. Liapunova ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Skin Temperature ◽  
Guinea Pigs ◽  
Cerium Dioxide ◽  
Negative Impact ◽  
Pharmacological Study ◽  
Histamine Level ◽  
Control Group ◽  
Post Exposure ◽  
Experimental Substantiation

Relevance. Cutaneous malignancies are one of the most widespread form of cancer with increasing prevalence and Ukraine and worldwide. A negative impact of ultraviolet radiation is one of the risk factors of this pathology, and it can be prevented by photoprotectors. It is expedient to develop a new effective and safe sunscreen with cerium dioxide nanoparticles, which is deprived of photocatalytic properties and has prominent photoprotective and antioxidant action. Objective: theoretic and experimental substantiation of a composition of a cream with cerium dioxide nanoparticles by the means of a screening of photoprotective action on a model of a photodynamic injury in guinea pigs with further identification of a leader cream. Material and methods. A photodynamic injury in guinea pigs was modeled with ultraviolet emitter with an exposition of 5 minimal erythema doses. Twenty minutes prior to exposure a cream with 0.1%, 0.25% or 0.5% cerium dioxide nanoparticles or a comparator cream with 3% titanium dioxide was applied topically. A leader cream was then chosen based on the following criteria: photoprotective action, skin temperature, blood leukocyte count, and serum histamine level. Results. The cream with 0.25% cerium dioxide nanoparticles was identified as a leader cream, because its photoprotective action was 43.6%, compared to 23.1% and 35.9% for 0.1% and 0.5% creams, respectively. After an application of the cream with 0.25% cerium dioxide nanoparticles there were less ulcers and deep skin lesions and 17.4% less leukocytosis than in pathology control group; the lowest increase (0.16 °С) in skin temperature was observed in comparison with other test creams; no increase in serum histamine level was detected. The cream with 0.25% cerium dioxide nanoparticles was more effective than a comparator. Four hours post-exposure there was 57.1% less pronounced erythema in the leader cream group than in the cream with 3% titanium dioxide group. photoprotective action of a comparator was only 23.1%. Skin temperature in a comparator group 4 hours post-exposure was 0.26 °С higher than in the cream with 0.25% cerium dioxide nanoparticles group. Moreover, 8.6% more pronounced leukocytosis was observed in the cream with 3% titanium dioxide group, compared to the leader cream group. Conclusions. The cream with cerium dioxide nanoparticles 0.25% was recognized as the leading sample and recommended for choosing technology and final composition of the finished dosage form, for further in-depth pharmacological study by totality of studied parameters.

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