Titanium dioxide (titania) nanomaterials have been extensively studied for various applications. It is mainly applied as white pigment to provide whiteness and opacity to different kinds of products such as coatings, paints, foods and etc. Titania nanomaterials can be produced using various methods, as such the optimization of methods used is the key to produce nanomaterials with desired properties. The objective of the work is to study the hydrothermal growth parameters, such as the effect of treatment time and sodium hydroxide concentration (NaOH) on the nanomaterials produced. Titania P25 (Degussa, Germany) and concentrated NaOH were treated hydrothermally under various conditions. Hydrothermal treatment for 12 and 24 h at 150°C produced nanoparticles, while treatment for 48 h at 150°C produced nanotubes. Analysis of nanomaterials formed shows nanoparticles are in the range of 80 to 120 nm. The results further indicate the formation of hydrous titanate molecule. This work allows for better understanding of the parameters that control the growth of the titania nanomaterials. This is very important as it can be used to produce titania nanomaterials with various surface morphology for all kinds of applications. © 2011 Asian Network for Scientific Information.