NCAT PHYSICS COLLOQUIUM SIRIES
2007/2008
Contact: Dr. Abebe Kebede
336-285 2113 or email abkebede@gmail.com




Space Science

Astronomy and Astrophysics

Dr. Kevin Ivarsen




Atmospheric Physics



Material Science


Dr. K.Roberts

 








  Dr. Kenneth Roberts







Dr. Kenneth L. Roberts
Associate Professor
Department of Mechanical and Chemical Engineering
North Carolina Agricultural and Technical State University
Greensboro, NC

  October 6,, 2008

Marteena Hall, Room 310  Time- 4:00 PM

Nanoscale Polymer Films and Ceramics for Microelectronics and Environmental Catalysis


Abstract
The search for novel, advanced materials has led many researchers to the investigate the unique properties of atomic scale materials, or nanomaterials, and their processing via nanomanufacturing. As material scales are varied from the bulk phase to the nanophase, noticeable variations in characteristics as catalytic, electronic, magnetic, mechanical, and optical properties can be observed. Current research within this group seeks to better understand the properties and performance of nanostructured materials for application in such areas as microelectronics processing, environmental catalysis, and biomedical engineering.
Porous interstitial transition-metal catalysts, such as molybdenum nitride, produced by means of temperature programmed reduction (TPR) have been examined in hydrogenation/dehydrogenation reactions, hydrotreatment reactions, ammonia synthesis/decomposition reactions and ultracapacitor devices.  Porous molybdenum nitride catalytic powders, nanocrystallites, nanoparticles, and with impregnation of zeolites have been synthesized by this group using temperature programmed reduction of molybdenum oxide parent material with reactant feed gases consisting of nitrogen/hydrogen mixtures and characterized using BET surface area analysis, X-ray diffractometry (XRD), room and high temperature X-ray diffractometry (RTXRD & HTXRD), thermal gravimetric analysis (TGA), and scanning tunneling microscopy (STM). The effects of reactant gas concentration, temperature ramping rate, and final synthesis temperature on the kinetics of the temperature programmed nitridation of molybdenum trioxide (MoO3) to γ-molybdenum nitride (γ-Mo2N) will be discussed using the techniques stated previously and predicted using solid-state theory.