تحضير جسيمات ثنائي اوكسيد التيتانيوم النانوية بطريقة الصول - جل باستخدام الازالة بالليزر وتطبيقاته كاصباغ نانوية == Synthesis of TiO2 Nanoparticles by Sol - Gel Method using Laser Ablation for Nano Paint Application
Author name:
زينب ناصر جميل
Supervisor name:
سمر يونس طه | عدوية جمعة حيدر
General topic:
Physics
Specific topic:
Laser Physics and Electro-optics
Degree:
Doctorate
University:
University of Baghdad - College Of Science For Girls - Physics Department
Language:
English
University location:
Baghdad
First pages:
26T1604 - p.pdf
Abstract:
Titanium dioxide (TiO2) nanoparticles (NPs) have been widely investigated to employ in the paint fields due to its importance as pigments. Therefore, TiO2 particles are perfect candidates in the paint industry. In addition to use nanoparticles for enhancing the local coating properties in our country.In this work, the sol - gel technique employed to prepare TiO2 nanoparticles with two procedures and two precursors (TIP and TiCl4), the obtained two phases of TiO2 (anatase and rutile), nanopaticles colloid irradiated by pulse laser ablation (PLA) for minimizing particle size. It has been fabricated a laboratory paint (TiO2/SiO2 hybrid sol - gel). Nanoparticles characterization has been carried out by different devices to study properties such as morphology, structure and optical properties, Transmission Electron Microscope (TEM) and Dynamic Light Scattering (DLS) demonstrated the size and shape of nanoparticles in the range of (3 - 40) nm spherical for anatase, while the rutile results were around (50 - 70) nm with ellipsoidal shape. Scanning Electron Microscopy (SEM), which was confirmed the results of TEM and DLS. Zeta - potential (ζ) results which were indicated the colloid stability, surface charge for the first procedure and the second procedure, anatse and rutile (+39.02, +25.68,+41.31 and+34.33) mV, respectively. The structural characteristics of TiO2 nano - powder investigated by X - ray Diffraction(XRD) to define the phases of TiO2, anatase at 500˚C , rutile at 900˚C, and Raman Spectroscopy to distinguish between crystalline phases, Raman shift resulted for anatase about (142.1,411.1,547.4 and 669.6) cm - 1, rutile (190,272,452 and 616) cm - 1. The optical properties measured by UV - Vis. Spectrophotometer to compute the energy band gap for both phases at (3.8 eV) for anatase and (3.4 eV) for rutile.The nanoparticles were mixed with coating solution (i.e. hybrid sol - gel and organosilicate nanoparticles (OSNP) in different concentrations (1%wt and 10%wt) for both anatase and rutile. Films were prepared by spin coating method which has been studied by the Energy Dispersive X - ray Spectroscopy (EDS) / Scanning Electron Microscope to define the components of concentrations, additionally, the films were studied the thickness and refractive index (n) by Spectroscopic Ellipsometry(SE) for nano - anatase (1%wt and10%wt) films thickness (128,382)nm and n equal (2.25,3.32), for nano - rutile films thickness (313.5,645.2) nm and n equal (2.5,2.8). Profilometer investigated the coating topography to demonstrate the Root Mean Square (RMS) toidentify the roughness which increased by increasing particle size. Fourier Transform Infrared (FTIR) analysis showed the strong bonds of the nanoparticles in frequency region between (400 - 1000) cm - 1 corresponds to Ti - O - Ti, also the bands at 793 and 1100cm - 1 were for a symmetric Si - O - Si stretching and vibration, respectively.Self - cleaning tests on the films were performed using Rhodamine B (RhB) as a pollution indicator. The effect of UV - irradiation on the films and contact angle measurements were studied. Anatase and rutile incorporated as a mixture with different ratios (1%.1.5% and 2%) in the local paint measurements, such as a washability and contrast test.Antibacterial activity in 10 - 5 and 10 - 3 TiO2 concentrations exhibited superior antibacterial activity with two types of bacteria, Escherichia coli (E - coli) and Staphylococcus aurous (S. aureus), respectively. TiO2 nanoparticles were more efficient as antibacterial agents with Staphylococcus aurous as compared with E - coli.
