Author/Authors :
Safaei-Naeini، Y. نويسنده Department of Material, Majlesi Branch, Islamic Azad University, Majlesi, Iran. , , Aminzare، M. نويسنده School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran. , , Golestani-Fard، F. نويسنده - Department of Materials Engineering, Iranian University of Science and Technology (IUST), Tehran, Iran Golestani-Fard, F. , Khorasanizadeh، F. نويسنده School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran. , , SALAHI، E. نويسنده ,
Abstract :
Ultraviolet–Visible (UV–Vis) spectroscopy was used, in the current investigation, to explore the dispersion
and stability of titania nanoparticles in an aqueous media with different types of dispersants. Hydrochloric and nitric
acids as well as ammonia were used to determine the stability of the suspension in the acidic region (pH=2.5) and
basic area (pH=9.5), respectively. In addition, for measuring sustainability of suspension and creating steric, and
electrosteric repulsive forces, ethylene glycol and ethylene glycol plus ammonia were employed, respectively. UV–V is
spectrometry was applied to realize the effect of nano titania concentrations and different types of dispersants of
samples containing different amounts of nano titania and different types of dispersants on stability of TiO2-containing
suspensions. In addition, the stability of dispersion could be evaluated in colloidal mixtures containing ethylene glycol
plus ammonia. It was demonstrated that the mixtures containing ethylene glycol plus ammonia were stable over a
period of 4 days. To support the UV–Vis results, other techniques such as atomic force microscopy (AFM) and scanning
electron microscopy (SEM) were employed to study the degree of agglomeration of titania nanoparticles in terms of
morphology and size.
