Related Papers
Materials and Design
On the study of phase and dimensionally controlled titania nanostructures synthesis at sub-zero temperatures
2016 •
devika laishram
The present studies are about surfactant free simple synthesis for titania (TiO 2) nanostructures, by which morphology and phase can be tuned through temperature variation. The formation of oval shaped nanocrystals and nanorods at different temperatures are attributed to the phase transformation between anatase and rutile by one-step chemical reaction involving titanium tetraisopropoxide and aqueous ethyl alcohol. Categorically, two different morphologies of TiO 2 were observed with respect to variation in temperature with nanorods formation at −20°C and − 10°C and oval shape formation at − 40°C and − 30°C with higher surface area. Crystalline nature and size of nano-TiO 2 were determined by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The energy gap of TiO 2 nanoparticles were determined by optical absorption measurement and found to be in the range of~2.92 to 3.02 eV with an indirect band nature.
Nanoscale
Polymorphic phase transition among the titania crystal structures using a solution-based approach: from precursor chemistry to nucleation process
2014 •
R C GIRISH Kumar
Materials Research Bulletin
Surface and related bulk properties of titania nanoparticles recovered from aramid–titania hybrid films: A novel attempt
2012 •
Mohamed Zaki, Fakhreia Al-sagheer
A Modified Thermal Treatment Method for the Up-Scalable Synthesis of Size-Controlled Nanocrystalline Titania
A Modified Thermal Treatment Method for the Up-Scalable Synthesis of Size-Controlled Nanocrystalline Titania
2016 •
Dr. Aysar S . Al Nidawi
Considering the increasing demand for titania nanoparticles with controlled quality for various applications, the present work reports the up-scalable synthesis of size-controlled titanium dioxide nanocrystals with a simple and convenient thermal treatment route. Titanium dioxide nanocrystals with tetragonal structure were synthesized directly from an aqueous solution containing titanium (IV) isopropoxide as the main reactant, polyvinyl pyrrolidone (PVP) as the capping agent, and deionized water as a solvent. With the elimination of the drying process in a thermal treatment method, an attempt was made to decrease the synthesis time. The mixture directly underwent calcination to form titanium dioxide (TiO 2) nanocrystalline powder, which was confirmed by FT-IR, energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) analysis. The control over the size and optical properties of nanocrystals was achieved via variation in calcination temperatures. The obtained average sizes from XRD spectra and transmission electron microscopy (TEM) images showed exponential variation with increasing calcination temperature. The optical properties showed a decrease in the band gap energy with increasing calcination temperature due to the enlargement of the nanoparticle size. These results prove that direct calcination of reactant solution is a convenient thermal treatment route for the potential large-scale production of size-controlled Titania nanoparticles.
Modelling Nano-Oxide Materials with Technological and Environmental Relevance: Silica, Titania and Titanosilicates
2018 •
Andy Cuko
Es bien sabido que las propiedades de los nanomateriales dependen del tamano y son muy diferentes de las del correspondiente cristal, o bulk. Tal comportamiento, que depende fuertemente del sistema y de la estructura, permite ajustar las propiedades del material variando sus dimensiones. Esta flexibilidad abre muchas posibilidades en nanotecnologia para la fabricacion de materiales con propiedades adaptadas para aplicaciones especificas. Por lo tanto, comprender las propiedades dependientes del tamano de las nanoparticulas y los mecanismos que tienen lugar a escala nanometrica es fundamental para la mejora de los materiales existentes, disenandolos mas eficientes y optimizados. Sin embargo, la sintesis de nanomateriales y su caracterizacion experimental es dificil, especialmente para tamanos muy pequenos. Aqui, la modelizacion teorica juega un papel fundamental en la caracterizacion de pequenas nanoparticulas, tanto para ayudar a la interpretacion experimental como para predecir mat...
Characterization of Nanostructured Titania and Titanate Materials
Khairul Anuar Mat Amin, Nur Arifah Ismail, Mohd Hasmizam Razali
In this research, the effect of different hydrothermal treatment temperature (100, 150, and 200 °C) on the products obtained by hydrothermal method was studied. Various characterization techniques was carried out such as X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy dispersive of x-ray spectroscopy (EDX) and fourier transform infrared spectroscopy (FTIR). XRD analysis shows that titanate phase was formed at 150 and 200 °C hydrothermal treatment. On the other hand, at 100 °C anatase TiO2 phase structured was gained which is similar with the TiO2 precursor. Morphological study using FESEM revealed that nanofibers and nanorods samples obtained at 150 °C and 200 °C, respectively. At 100°C, irregular shaped particle was attained similar with TiO2 precursors. FTIR spectra for the all studied sample displayed three main broad peaks at the range of 3700-2800, and 1800-1400 assigned to –OH stretching and deformation mode due to H2O molecules and M-O stretching mode at 900-400 cm-1 assigned to Ti-O bond
Materials Research Bulletin
surface and related bulk properties of titania nanoparticles reocved from aramid-titania hybrid films: A novel attempt
2012 •
Sara Alomani
GROWTH OF RUTILE CRYSTALLITES DURING THE INITIAL STAGE OF ANATASE-TO-RUTILE TRANSFORMATION IN PURE TITANIA AND IN TITANIA-ALUMINA NANOCOMPOSITES
Padmakumar Nair
Cheminform
ChemInform Abstract: Nanostructuring Titania: Control over Nanocrystal Structure, Size, Shape, and Organization
2010 •
Abdelkrim Chemseddine
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Materials Science Forum
Hydrothermal Synthesis of Nanostructured Titania
2010 •
walter kenji yosh*to
