Volume 3 Issue 1
Polymer-Mediated Of Nano-Sized Alumina (Al2O3) As Catalyst Prepared By CoPrecipitation Method
Majid Farahmandjou1*and Nazafarin Golabiyan1
Alumina (Al2O3) is a very interesting material with broad applicability as a support for various catalytically active phases and ceramic materials. Aluminium oxide (Al2O3) Nanoparticles were synthesized by aluminium chloride hexahydrate as precursor and polyvinylpyrrolydon (PVP) as surfactant and polymer agent. The samples were characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electron dispersive spectroscopy (EDS). XRD pattern exhibited gamma-Al2O3 to alpha- Al2O3 structural phase transition in the samples. The mean diameter of sphere-like as-prepared nanoparticles was around 26 nm and mean diameter of annealed sample was around 10 nm as estimated by XRD technique and direct HRTEM observation. The surface morphological studies from SEM depicted the size of alumina decreases with increasing annealing temperature. The effect of PVP surfactant on the morphology of the alumina nanoparticles has been investigated. EDS showed peaks of aluminium and oxygen in prepared Al2O3.
Indirect Resin Composite Restorations- A Narrative Review
Limly Bal T1*, Dhanavel Chakravarthy1, Padmaraj SN1, Vijayaraja S1,Ambily Jayadevan1 and Nandini Dimple1
Esthetic dentistry is a global phenomenon that continues to grow and expand over the past 30 years many have called it a revolution, but this denotes sudden monumental change. In today’s world looking good is a prime concern. Appearance is closely linked to social acceptance and professional success. Newer technologies are being harnessed for this purpose and advanced research is being undertaken. The focus of dentistry in the present times is not only on prevention and treatment of disease but on meeting the demands for better esthetics. Thus, dentistry has evolved from a curative to a creative science in a very short span.