Mayur Sundararajan, graduate student in Physics & Astronomy, presented twice at the May 17-21, 2015, joint meeting of Deutsche Glastechnische Gesellschaf of the German Society of Glass Technology (DGG) and the Glass & Optical Materials Division of the American Ceramic Society (ACerSGOMD.)
This conference is the second of a two-year experiment to combine the American and German annual conferences in an effort to strengthen ties between U.S. and European glass researchers.
Sundararaajan’s presenstation on “Structure and Mechanical Properties of Nanoporous Glasses Characterized by X-ray Scattering” was co-authored by Ohio University graduate student Chandrasiri Ihalawel and Dr. Gang Chen, Associate Professor of Physics & Astronomy.
Structure and Mechanical Properties of Nanoporous Glasses Characterized by X-ray Scattering
Abstract: Nanoporous glasses have very interesting structure and properties due to their large specific surface area that can easily exceed 1000 m2 /g. The large surface area leads to a high fraction (as high as one third) of atoms on the surface. Therefore, nanoporous glasses are prototypical materials for studying structure and properties of ultrathin glasses. In this talk, we report an application of small-angle and wide-angle X-ray scattering to the study of structure and mechanical properties of periodic mesoporous silica. The short-range, medium-range, and nanoscale structure of the nanoporous glasses have been characterized. It has been found that pore walls of the nanoporous glasses are highly strained, which originates from the anisotropic structure between the surface and bulk of the glasses. Mechanical properties such as Young’s modulus and Poisson’s ratio have also been characterized using small-angle and wide-angle X-ray scattering in conjunction with in situ capillary condensation. A significant enhance of the Young’s modulus of the nanoporous glasses has been observed after an increase of thermal annealing temperature by merely 100 Celsius degrees. The structure-property relationship behind this observation will be discussed. (GOMD-S3-049-2015) Structure and Mechanical Properties of Nanoporous Glasses Characterized by X-ray Scattering M. Sundararajan1 ; C. A. Ihalawela1 ; G. Chen*1 ; 1. Ohio University, USA
Stress Manipulation of Mesoporous Titanium Phosphate Glass
Chen co-authored “Stress Manipulation of Mesoporous Titanium Phosphate Glass.” Sundararajan also co-authored a poster on “Growth Mechanism of Amorphous Sb2Te3 Thin Films and Nanowires Prepared by Electrochemical Deposition.”
Abstract: Titanium Phosphate (TiPO4) is a known photocatalyst with an optical band gap in the visible light region. One possible way to modify the optical band gap of a material is through stress manipulation. In our previous study, we have demonstrated that the pore walls of mesoporous glasses are highly stressed, which opens a way to manipulate optical properties of such materials. In this study, we synthesized mesoporous TiPO4 through a sol-gel method. The atomic and nanoscale structure of the mesoporous glass was characterized by small and wide angle X-ray scattering as well as N2 gas-sorption. The effect of thermal annealing on the structure and residual stresses of the material was examined, and its relation to the optical band gap of the material was established. Our study demonstrated a new physical method to modify the optical band gap of amorphous photocatalysts. (GOMD-S5-053-2015) Stress Manipulation of Mesoporous Titanium Phosphate Glass M. Sundararajan 1 ; G. Chen1 ; 1. Ohio University, USA
Comments