The effect of ph on the properties of silica nanoparticles / Halawati Othman

• Main Author: Othman, Halawati
• Format: Student Project
• Language: English
• Published: 2020
• Subjects: Spectroscopy; Inorganic chemistry
• Online Access: http://ir.uitm.edu.my/id/eprint/41734/1/41734.PDF; http://ir.uitm.edu.my/id/eprint/41734/

In this project, silica particles have been successfully produced by using adjusted StOber method. Tetraethyl orthosilicate (TEOS) was used as source of silica, Sodium Hydroxide (NaOH) as catalyst, and Cetyl Trimethylammonium Bromide (CTAB) as pore-forming agent and surfactants. In order to study the effect of pH on the properties of silica particles, the amount of NaOH has been adjusted to find the different value of pH. The samples were analysed by using EDX, SEM, FTIR, UV-Vis, and XRD. According to SEM, the size of silica particles produced is about 0.423 micrometer. From UV-Vis spectroscopy, the direct energy band gap has been analysed by using Tauc plot. The energy band gap has been estimated for SO.10, SO.15, SO.20, SO.25 and SO.30 samples are 3.9184, 3.9554, 3.8679, 3.9939 and 4.0695 eV respectively. Increase of energy bandgap shows the decrease of particles size. XRD pattern shows several sharp peaks for sample SO.1 and SO.2 that defined as crystalline structure. While, for SO.30 sample show broad peak which determine amorphous pattern state of silica. The reaction parameters should be carefully adjusted in order to produce high quality silica particles which suitable for application in drug delivery