Department of Chemistry & Biochemistry School of Integrated Science and Humanities Departmental Seminar Announcement Molecular Analysis at the Nanoscale Dr. Emile A. Schweikert Professor Texas A&M University The importance of characterizing nanosize particles and domains is widely recognized. Yet, measurement techniques for molecular assemblies in dimensions below 50 nm are lagging. Our approach to advance nanoanalysis is based on secondary ion mass spectrometry, sims, with novel methodology and instrumentation. Samples are bombarded with a sequence of individual 1,2+ 4+ “nanoprojectiles,” specifically š¶60 or š“š¢400 (a nanoparticle of ~1.5 nm in diameter). The impact of a single nanoprojectile at hypervelocity (~30 km/s) generates abundant ion emission from a surface volume of 10-15 nm in diameter and ~10 nm in depth. The ejecta from each impact are mass analyzed and recorded individually. Thus, the co-emitted ions originate from molecules co-located within <15 nm. The presentation will describe the custom-built instrumentation, the methodology for data acquisition and processing and the analysis of nanoscale domains and particles. Several examples will be discussed: homogeneity test of a surface of complex composition; characterization of nanoscopic molecular systems; analysis of individual nanoparticles in size <20 nm. Date: Time: Friday, October 31, 2014 11:00 am to 12:00 pm Location: Academic Health Center 3, AHC3-205 – MMC (Live) Marine Sciences Building Room 150 (MSB-150) – BBC (via Polycom) Phone: 305-348-2605 Fax: 305-348-6700 E-mail: chemistry@fiu.edu http://chemistry.fiu.edu