Influence of phonon confinement, surface stress, and zirconium doping on the Raman vibrational properties of anatase TiO2 nanoparticles

2011 ◽  
Vol 42 (11) ◽  
pp. 2026-2035 ◽  
Author(s):  
Christian Lejon ◽  
Lars Österlund
Keyword(s):  
Tio2 Nanoparticles ◽  
Surface Stress ◽  
Anatase Tio2 ◽  
Vibrational Properties ◽  
Phonon Confinement ◽  
Zirconium Doping

scholarly journals Green synthesis of mesoporous anatase TiO2 nanoparticles and their photocatalytic activities

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48083-48094 ◽  
Author(s):  
Sunderishwary S. Muniandy ◽  
Noor Haida Mohd Kaus ◽  
Zhong-Tao Jiang ◽  
Mohammednoor Altarawneh ◽  
Hooi Ling Lee
Keyword(s):  
Low Temperature ◽  
Green Chemistry ◽  
Visible Light ◽  
Green Synthesis ◽  
Tio2 Nanoparticles ◽  
Soluble Starch ◽  
Anatase Tio2 ◽  
Photocatalytic Activities ◽  
Visible Light Active

Mesoporous anatase TiO2 nanoparticles are produced by employing a facile green chemistry approach at low temperature with soluble starch as the template in this work. The obtained TiO2 photocatalyst is visible-light active with good photocatalytic activities.

TiO2 Nanotubes Transformation Into 4nm Anatase Nanoparticles

2021 ◽  
pp. 810-830
Author(s):  
Celeste Yunueth Torres López ◽  
Jose de Jesus Perez Bueno ◽  
Ildefonso Zamudio Torres ◽  
Maria Luisa Mendoza López ◽  
Abel Hurtado Macias ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Organic Contaminants ◽  
Tio2 Nanotubes ◽  
Anatase Tio2 ◽  
Organic Media ◽  
Final State ◽  
Active Electrode ◽  
Anatase Nanoparticles ◽  
Modified Layer ◽  
Experimental Findings

The scope of this work shows novel experimental findings on preparing anatase TiO2 nanoparticles, first anodizing titanium into an organic media for obtaining TiO2 nanotubes, and using these as a photocatalytic active electrode in treating water polluted with organic contaminants. The substrates were grit blasted to obtain mechanical fixation of the generated nanotubular TiO2 structure. This was successfully achieved without diminishment of the nanotubes order and with a self-leveling of the outer surface. A new phenomenon has been investigated consisting of the process of oxidation of the nanotubes in water after anodizing. Along this process, methyl orange added to the aqueous solution was discolored as part of the redox reaction involved. The final state of the modified layer was composed of conglomerates of almost completely crystalline TiO2 nanoparticles, around 4 nm in size, consisting of anatase. SEM and TEM images show the transition of the amorphous nanotubes (atomic disorder/nanometric order) to crystalline disordered particles (atomic order/nanometric disorder).

scholarly journals First-Principles Modeling of Oxygen-Deficient Anatase TiO2 Nanoparticles

2020 ◽  
Vol 124 (43) ◽  
pp. 23637-23647
Author(s):  
James. A. Quirk ◽  
Vlado K. Lazarov ◽  
Keith P. McKenna
Keyword(s):  
Tio2 Nanoparticles ◽  
First Principles ◽  
Anatase Tio2

Stresses exerted by ZnO, CeO2 and anatase TiO2 nanoparticles on the Nitrosomonas europaea

2010 ◽  
Vol 348 (2) ◽  
pp. 329-334 ◽  
Author(s):  
Xiaohua Fang ◽  
Ran Yu ◽  
Bingquan Li ◽  
Ponisseril Somasundaran ◽  
Kartik Chandran
Keyword(s):  
Tio2 Nanoparticles ◽  
Nitrosomonas Europaea ◽  
Anatase Tio2

Molecular Dynamics Study of Anatase TiO2 Nanoparticles in Water and Vacuum Environments

2012 ◽  
Author(s):  
George Okeke ◽  
Robert B. Hammond ◽  
S. Joseph Antony
Keyword(s):  
Molecular Dynamics ◽  
Surface Tension ◽  
Surface Energy ◽  
Tio2 Nanoparticles ◽  
Anatase Tio2 ◽  
Particle Sizes ◽  
Metallic Oxides ◽  
Wide Range ◽  
Enhanced Properties ◽  
Dynamics Simulations

Nanoparticles are nanometer sized metallic oxides which possess enhanced properties that are desirable to a wide range of industries. In this study, we investigate structural and surface properties of anatase TiO2 nanoparticles in vacuum and water environments using molecular dynamics simulations. The particle sizes ranged from 2 to 6 nm and simulations were performed at 300 K. Surface energy of the particles in vacuum was seen to be higher than that of the particles in water by about 100% for the smaller particles (i.e. 2 and 3nm) and about 60% for the larger particles (i.e. 4 to 6 nm). Surface energy of the particles in both environments, is seen to increase to a maximum (optimum value) as the particle size increases after which no further significant increase is observed. In vacuum, studies carried out at temperatures ranging from 300–2500 K showed a high dependence of surface energy on temperature. The estimated surface tension of water is seen to agree quite well with that of experiments.

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