Effect of silicon dioxide on the formation of the phase composition and pore structure of titanium dioxide with the anatase structure

2009 ◽  
Vol 50 (5) ◽  
pp. 760-767 ◽  
Author(s):  
G. A. Zenkovets ◽  
V. Yu. Gavrilov ◽  
A. A. Shutilov ◽  
S. V. Tsybulya
Keyword(s):  
Titanium Dioxide ◽  
Phase Composition ◽  
Silicon Dioxide ◽  
Pore Structure ◽  
Anatase Structure

Impact of medical titanium implant surface on the efficiency of fibrointegration

2020 ◽  
pp. 50-55
Author(s):  
T. R. Davydova ◽  
А. I. Shaikhaliev ◽  
D. A. Usatov ◽  
G. A. Gasanov ◽  
R. S. Korgoloev
Keyword(s):  
Surface Roughness ◽  
Titanium Dioxide ◽  
Rough Surface ◽  
Soft Tissues ◽  
Titanium Implant ◽  
Implant Surface ◽  
Anatase Structure ◽  
Bioactive Coating ◽  
Cell Structures ◽  
Titanium Alloy Ti6al4v

The aim of this study was to study the effect of surface branching of titanium endoprostheses on the efficiency of fibrointegration. The object of the study was samples of titanium alloy Ti6Al4V in the form of disks with a diameter of 5 mm and a thickness of 1 mm with various surface treatments: 1) samples with a rough surface after sandblasting; 2) samples with a rough surface after sandblasting with a bioactive coating of titanium dioxide TiO2 with anatase structure. The study of surface roughness was carried out by profilometry. Evaluation of the spreading and proliferation of cells on the surface of test samples, as well as evaluation of the effectiveness of fibrointegration was carried out according to standard methods using scanning electron microscopy. During the experiments, mesinchymal stem cells were sown on test samples and the test samples were introduced into the soft tissues of experimental animals. Based on the results obtained, it was concluded that the technology of forming rough surfaces by sandblasting does not provide high uniformity and reproducibility in the nanometer range and, apparently, another method for obtaining a rough surface should be chosen. The application of a bioactive coating of titanium dioxide TiO2 with the anatase structure to the surface of titanium endoprostheses increases the efficiency of fibrointegration, however, primarily the fibrointegration of titanium endoprostheses depends on their surface roughness, which determines the concentration of cell structures, the intensity of their adhesion and the ability to fibrointegrative process.

The study of crystal-phase composition and pore structure for Dicaoqing-Zisha compared with porcelain and pottery

2020 ◽  
Author(s):  
Chunrui Yang ◽  
Jianyi Kong ◽  
Jiajing Yang ◽  
Chengliang Chu ◽  
Xingdong Wang ◽  
...  
Keyword(s):  
Phase Composition ◽  
Pore Structure ◽  
Crystal Phase

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.

Study of the Zirconium and Silicon Homovalent Dopants Insertion on the Structure and Bandgap Energy of Titanium Dioxide Powders

2018 ◽  
Vol 930 ◽  
pp. 67-72
Author(s):  
Hiana Muniz Garcia ◽  
Eduardo Felipe de Carli ◽  
Natali Amarante da Cruz ◽  
Jusinei Meireles Stropa ◽  
Lis Regiane Vizolli Favarin ◽  
...  
Keyword(s):  
Phase Transition ◽  
Titanium Dioxide ◽  
Performance Enhancement ◽  
Thermal Analyses ◽  
Rutile Phase ◽  
Bandgap Energy ◽  
Structural Effects ◽  
Structural Refinement ◽  
Anatase Structure ◽  
Atomic Coordinates

The reconstructive transformation occurring during the anatase-to-rutile phase transition can be observed through adequate techniques such as Thermal Analyses and Z-ray diffractometry followed by structural refinement. The typical photonic properties of titanium dioxide photocatalysts depend on the anatase structure and how the modifiers can provide their performance enhancement. In the present work, we investigate the structural effects caused by the simultaneous homovalent modification on the anatase structure in order to understand the mechanisms of the anatase-to-rutile phase transition in terms of the atomic coordinates and the lattice parameters. The refined structures along the calcination temperature from 500 to 900 oC suggest the oxygen bonds are strongly affected in unmodified anatase in order to destroy and rebuilt the crystal structure and lead to the rutile phase formation above 700 oC, unless some modifier pairs stabilize them.

scholarly journals Deposition of gold nanoparticles from colloid on TiO2 surface

2017 ◽  
Vol 68 (6) ◽  
pp. 487-491
Author(s):  
Vlastimil Rehacek ◽  
Ivan Hotovy
Keyword(s):  
Gold Nanoparticles ◽  
Titanium Dioxide ◽  
Silicon Dioxide ◽  
Coupling Agent ◽  
Oxide Surface ◽  
Tio2 Surface ◽  
Metal Oxide Surface ◽  
Colloidal Gold Nanoparticles ◽  
Titanium Dioxide Surface ◽  
Silicon Silicon

AbstractIn this paper, experimental results are presented on the deposition of colloidal gold nanoparticles on the surfaces of TiO2prepared on silicon/silicon dioxide. Important procedures, such as titanium dioxide surface hydrophilization as well as functionalization by an organosilane coupling agent (3-aminopropyl) trimethoxysilane and (3-mercaptopropyl) trimethoxysilane were investigated in order to obtain a metal oxide surface with the most convenient properties for immobilization of gold nanoparticles having a dense and uniform distribution. TiO2nanotips prepared by reactive ion etching of oxide surface covered with self-mask gold nanoparticles are demonstrated.

Nano-Additives Based on Titanium Dioxide and Silicon Dioxide for Self-Cleaning Concretes

2021 ◽  
pp. 47-53
Author(s):  
V.V. TYUKAVKINA ◽  
E.A. SHCHELOKOVA ◽  
K.A. POZHIVINA ◽  
A.G. KASIKOV
Keyword(s):  
Titanium Dioxide ◽  
Silicon Dioxide ◽  
Nano Additives ◽  
Self Cleaning

scholarly journals Design of gold nanoparticles-decorated SiO2@TiO2 core/shell nanostructures for visible light-activated photocatalysis

RSC Advances ◽  
2017 ◽  
Vol 7 (13) ◽  
pp. 7469-7475 ◽  
Author(s):  
Ryeri Lee ◽  
Yogeenth Kumaresan ◽  
Sei Young Yoon ◽  
Soong Ho Um ◽  
Il Keun Kwon ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Silicon Dioxide ◽  
Au Nanoparticles ◽  
Core Shell ◽  
Photocatalytic Reaction ◽  
Shell Nanostructures ◽  
Visible Light Driven

In this study, we designed core/shell nanostructures (CSNs) of silicon dioxide (SiO2)/titanium dioxide (TiO2), which were decorated with gold (Au) nanoparticles (NPs), to activate the visible light-driven photocatalytic reaction.

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