scholarly journals Features of Surface Structures of Alumina and Titanium Dioxide Nanoparticles Produced Using Different Synthesis Methods

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Vyacheslav Syzrantsev ◽  
Evgenii Paukshtis ◽  
Tatyana Larina ◽  
Yuriy Chesalov ◽  
Sergey Bardakhanov ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Surface Properties ◽  
Titanium Dioxide Nanoparticles ◽  
Energy Shift ◽  
Synthesis Methods ◽  
Diffuse Reflection Spectroscopy ◽  
X Ray Diffraction ◽  
Significant Difference ◽  
Luminescence Characteristics ◽  
Comprehensive Study

A comparative study of the scope and surface properties of alumina (Al2O3) and titanium dioxide (TiO2) nanoparticles, synthesized using different methods, was carried out using Fourier-transform infrared spectroscopy (FTIR), ultraviolet UV-Vis diffuse reflection spectroscopy (UV-Vis DRS), and Raman spectroscopy, as well as X-ray diffraction methods. It is shown that the differences in the synthesis methods can change the surface properties of the nanoparticles, while maintaining the phase composition of the material. The nanoparticles of each material are shown to exhibit unexpected properties. In particular, the special luminescence characteristics of TiO2, a photon-energy shift from the rutile region into that region typical for the anatase, and a significant difference in the Lewis center concentration values for the alumina γ-phase were observed. This variation in the properties indicates the necessity to involve a wider range of analysis techniques and the importance of precisely characterizing the surface properties. To identify those nanoparticle functional properties that determine their interactions with other materials, a comprehensive study of their phase compositions and surface properties must be completed.

Effect of Sonication Time and Calcination Temperature on Physical Properties of Titanium Dioxide Synthesized via Sonochemical-Assisted Process

2013 ◽  
Vol 802 ◽  
pp. 252-256 ◽  
Author(s):  
Chokchai Kahattha ◽  
Naratip Vittayakorn ◽  
Wisanu Pecharapa
Keyword(s):  
Titanium Dioxide ◽  
Electron Microscope ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Titanium Isopropoxide ◽  
Treatment Temperature ◽  
Sonication Time ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
Transmission Electron

Titanium dioxide nanoparticles (TiO2) were successfully synthesized via a sonochemical-assisted process using titanium isopropoxide as the titanium sources and calcination process at 300-500 °C. The effect of sonication time and heat treatment temperature on structural and nanostructure properties of the nanoparticles were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM) and transmission electron microscope (TEM). The XRD and Raman results indicated that the crystalline of as-sonochemically synthesized TiO2 nanoparticles corresponded to anatase phase of TiO2 after sonication for 30 mim. The high quality crystalline anatase phase and increasing of crystalline size can be obtained after calcinations process.

Photoconversion of CO2 using copper-modified titanium dioxide nanoparticles

2011 ◽  
Vol 76 (11) ◽  
pp. 1335-1346 ◽  
Author(s):  
Jing Wei ◽  
Xin Tan ◽  
Tao Yu ◽  
Lin Zhao
Keyword(s):  
Titanium Dioxide ◽  
Photoelectron Spectroscopy ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Chemical Properties ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Illumination ◽  
One Step

A series of copper-modified titanium dioxide (Cu/TiO2) nanoparticles were synthesized via one-step sol-gel method. The crystal structure and chemical properties were characterized using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Cu/TiO2nanoparticles were applied to CO2photoconversion and the yield of formaldehyde was used to evaluate the photocatalytic performance. The optimum amount of copper modifying was 0.6 wt.% and the yield of formaldehyde was 946 μmol/gcatunder UV illumination for 6 h. 20 wt.% Cu/TiO2also performed a high photocatalytic activity, which yielded 433 μmol/gcatformaldehyde under UV illumination for 6 h.

scholarly journals Synthesis and Characterization of Anatase Titanium Dioxide Nanoparticles Using Egg White Solution via Sol-Gel Method

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Samira Bagheri ◽  
Kamyar Shameli ◽  
Sharifah Bee Abd Hamid
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Egg White ◽  
Gelling Agent ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Egg White Proteins

Anatase titanium dioxide nanoparticles (TNPs) are synthesized by a simple and cost-effective process with and without freshly water-soluble egg white proteins (albumin) via sol-gel method. The main advantage of using egg white proteins as a gelling agent is that it can provide long-term stability for nanoparticles by preventing particles agglomeration. The X-ray diffraction and FTIR results indicate that the synthesized nanoparticles have only the anatase structure without the presence of any other phase impurities. Additionally, the TNPs are characterized by a number of techniques such as thermogravimetric analysis (TGA), X-ray diffraction analysis (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and ultraviolet visible spectra (UV-vis). The sizes of titanium dioxide nanoparticles with and without using egg white solution are12.55±3.42 nm and21.45±4.21 nm, respectively. The results indicate that egg white solution is a reliable and cheap green gelling agent that can be used as a matrix in the sol-gel method to synthesis tiny size TNPs.

scholarly journals Influence of TiO2Nanoparticles on Growth and Phenolic Compounds Production in Photosynthetic Microorganisms

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Mattia Comotto ◽  
Alessandro Alberto Casazza ◽  
Bahar Aliakbarian ◽  
Valentina Caratto ◽  
Maurizio Ferretti ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Phenolic Compounds ◽  
Haematococcus Pluvialis ◽  
Titanium Dioxide Nanoparticles ◽  
Arthrospira Platensis ◽  
Significant Inhibition ◽  
Antioxidant Compounds ◽  
Significant Difference ◽  
Photosynthetic Microorganisms ◽  
Significant Growth Inhibition

The influence of titanium dioxide nanoparticles (pure anatase and 15% N doped anatase) on the growth ofChlorella vulgaris,Haematococcus pluvialis, andArthrospira platensiswas investigated. Results showed that pure anatase can lead to a significant growth inhibition ofC. vulgarisandA. platensis(17.0 and 74.1%, resp.), while forH. pluvialisthe nanoparticles do not cause a significant inhibition. Since in these stress conditions photosynthetic microorganisms can produce antioxidant compounds in order to prevent cell damages, we evaluated the polyphenols content either inside the cells or released in the medium. Although results did not show a significant difference inC. vulgaris, the phenolic concentrations of two other microorganisms were statistically affected by the presence of titanium dioxide. In particular, 15% N doped anatase resulted in a higher production of extracellular antioxidant compounds, reaching the concentration of 65.2 and68.0 mg gDB-1forH. pluvialisandA. platensis, respectively.

Titanium Dioxide Nanoparticles and Cetylpyridinium Chloride Enriched Glass-Ionomer Restorative Cement: A Comparative Study Assessing Compressive Strength and Antibacterial Activity

2019 ◽  
Vol 43 (1) ◽  
pp. 42-45
Author(s):  
Nida Hamid ◽  
Ravishankar Lingesha Telgi ◽  
Amit Tirth ◽  
Vaibhav Tandon ◽  
Smita Chandra ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Tio2 Nanoparticles ◽  
Titanium Dioxide Nanoparticles ◽  
Cetylpyridinium Chloride ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Significant Difference

Objective: To evaluate the addition of titanium dioxide (TiO2) nanoparticles and cetylpyridinium chloride (CPC) on the compressive strength and antibacterial activity of conventional glass-ionomer cement (GIC). Study design: TiO2 nanoparticles enriched GIC was prepared by adding 3% TiO2 nanoparticles (w/w) into the powder component of conventional GIC. CPC containing GIC was developed by incorporating 1% CPC (w/w) into conventional GIC powder. Samples were segregated into three groups: GIC with 3% TiO2 nanoparticles, GIC with 1% CPC and unmodified conventional GIC. Compressive strength was assessed using the universal testing machine on cylindrical specimens made from each material. Antibacterial activity was assessed by measuring inhibition zones on Mitis Salivarius Bacitracin (MSB) agar inoculated with pure strain of Streptococcus mutans (S. mutans). Results: GIC containing TiO2 nanoparticles exhibited significantly greater compressive strength as compared with CPC and conventional GIC groups (P < 0.01). However, there was no significant difference between the compressive strengths of CPC and conventional GIC group (P >0.05). Antibacterial activity was significantly greater for TiO2 group than conventional GIC (P <0.05). CPC increased the antibacterial activity of conventional GIC, though not significantly. Conclusion: The addition of 3% TiO2 nanoparticles improves the compressive strength of GIC as well as its antibacterial activity against S. mutans.

scholarly journals Synthesis and Characterization of Titanium Dioxide Nanoparticles under Different pH Conditions

2018 ◽  
Vol 25 (1) ◽  
pp. 40-50
Author(s):  
Basma Abbas Abdulmajeed ◽  
Sameera Hamadullah ◽  
Fadhil Abed Allawi
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Ammonium Hydroxide ◽  
Titanium Isopropoxide ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Size Growth ◽  
Ph Level

Ethanol as a solvent, a precursor of titanium isopropoxide and a stabilizer of either hydrochloric acid or ammonium hydroxide was used to prepare a titanium dioxide aqueous solution. The aqueous solutions with different values of pH and the morphology of the resultant reaction of the nanoparticles of titanium dioxide were investigated. The X-ray diffraction showed that at low temperatures and with acidic solutions, rutile structures are more favorable to grow on titanium dioxide synthesized, while at low and average temperatures and with base solutions, anatase phase is more pronounced. The crystalline form and the re-confirmation of the crystallite size growth were observed by the scanning electron microscopy. The atomic force microscopy was used to confirm the relation between the roughness and thickness with the pH level.  

scholarly journals A comprehensive review on green synthesis of titanium dioxide nanoparticles and their diverse biomedical applications

2022 ◽  
Vol 11 (1) ◽  
pp. 44-63
Author(s):  
Suresh Sagadevan ◽  
Shahla Imteyaz ◽  
Baranya Murugan ◽  
Jayasingh Anita Lett ◽  
Nanthini Sridewi ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Metal Oxide ◽  
Biomedical Applications ◽  
Titanium Dioxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Cost Effective ◽  
Biological Synthesis ◽  
Synthesis Methods ◽  
Environmental Friendliness ◽  
Environmentally Safe

Abstract Metal oxide nanoparticles (NPs) have found a variety of applications in numerous industrial, medical, and environmental fields s, attributable to recent advances in the nanotechnology field. Titanium dioxide nanoparticles (TiO2-NPs) have gained importance as metal oxide NPs due to their potential in various fields, particularly nanomedicine and other biomedicine fields. Several studies have confirmed that NPs produced via the biosynthesis route using natural resources have significant advantages such as fewer toxic contaminants, less subsequent complex chemical synthesis, environmental friendliness, cost-effectiveness, and stability when compared to NPs produced by conventional methods, and its production with controlled shapes and sizes. Therefore, considerable effort is being expended to implement biological synthesis methods with these proven advantages. TiO2-NPs can be made using a variety of biological, chemical, and physical methods. Physicochemical methods are costly, emit high levels of toxic chemicals into the atmosphere, and consume a lot of energy. On the other hand, the biological approach is an environmentally safe, cost-effective, dependable, convenient, and easy way to synthesize TiO2-NPs. In this review, the bio-mediated synthesis, as well as various biomedical applications of TiO2-NPs, were discussed.

scholarly journals Titanium Implants Coated with a Bifunctional Molecule with Antimicrobic Activity: A Rabbit Study

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3613 ◽  
Author(s):  
Antonio Scarano ◽  
Francesco Carinci ◽  
Tiziana Orsini ◽  
Luca Valbonetti ◽  
Erda Qorri ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Titanium Implants ◽  
P Value ◽  
Implant Surface ◽  
Bone Implant ◽  
Bifunctional Molecule ◽  
Significant Difference ◽  
Bone Implant Contact ◽  
Antimicrobic Activity

Background: Various surface treatments have been tested for titanium implants aiming at increasing their surface biocompatibility and their biological characteristics, but also the efficiency of the implant surface will have to be improved to drastically decrease peri-implantite and mucosite. In fact, the peri-implantitis and peri-implant mucositis have a high incidence in clinical practice. The nanofabrication techniques that offer the possibility to achieve the implant surface that reduces bacterial colonization could influence the osteointegration. The aim of this research was to evaluate the bone response to titanium implants coated with a bifunctional molecule with antimicrobic activity consisting of a combination of silver ions covalently bound to titanium dioxide nanoparticles. Methods: A total of 36 implants were inserted into 18 older New Zealand white male rabbits. They had two different surfaces. The implants Control group was characterized by an acid-etched and sandblasted surface treatment, and the Test implants had an acid-etched and sandblasted surface coated with a silver ion covalently bound to titanium dioxide nanoparticles in the solution. Results: No statistically significant difference of the bone density was evidenced between Control and Test implants at two weeks (p-value = 0.623), four weeks (p-value = 0.339), and eight weeks (p-value = 0.461). Moreover, no statistically significant difference of the bone-implant contact percentage was evidenced between Control and Test implants at two weeks (p-value = 0.938), four weeks (p-value = 0.307), and eight weeks (p-value = 0.294). The effectiveness of the present investigation demonstrated no adverse effects on osseointegration, and no statistically significant differences were observed in the bone density and percentage of bone-implant contact between Test and Control implants at all the experimental time points (two, four, and eight weeks). Conclusions: Titanium implants coated with the silver-anatase solution bind very well to the bone and did not have an adverse effect on the bone tissue in a rabbit model. These facts suggest possible clinical applications for the silver composition.

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