Mass Spectrometry Methods for the Comprehensive Analysis of Emerging Functional Materials

University Of Akron, Akron OH

Investigators

Abstract

In this project, funded by the Chemical Measurement and Imaging Program of the Chemistry Division, Professor Chrys Wesdemiotis and his group at the University of Akron are developing new methods for the characterization of advanced materials used in mechanical, electrical, biomedical, optical, or environmental applications (such as implants, coatings, adhesives, membranes, and "smart surfaces"). The methods are based on mass spectrometry, a powerful tool for characterizing the compositions and structures. They allow accurate and sensitive analysis of the molecular structures of the synthetic macromolecular compounds comprising these materials, enabling meaningful understanding of the relationships between molecular structure and useful properties, thus facilitating the design of better, commercially viable products with desired macroscopic features. The research provides opportunities for undergraduate and graduate students (including students from underrepresented groups) to engage in modern chemical analysis and materials research, two areas with growing employment opportunities that are vital for our nation's technological advancement. A major objective of this research is to integrate mild thermal desorption/degradation with online mass spectrometry for the microstructural characterization of crosslinked polymers and materials with very high molecular weight, such as hydrogels and rubber copolymers. Relatively low temperatures are employed in order to preferentially break weak bonds or to probe sterically crowded sites, yielding oligomeric species that provide molecular connectivity detail as well as insight into crosslinkers and polymer precursors. A further objective concerns the development of surface-layer matrix assisted laser desorption ionization mass spectrometric imaging for the detection of intact molecules within the top 2 nm of synthetic material surfaces. Understanding of the surface composition and detection and characterization of unwanted defects or deliberate surface modifications is imperative for deciding a material?s suitability for a given application, since the surface is the first point of contact with the environment. The Wesdemiotis group uses multidimensional approaches (combining mass analysis, tandem mass spectrometry, and orthogonal separation by polarity and/or shape) to enable sensitive and precise analysis of the composition, structure, and architecture of synthetic macromolecular compounds that are widely employed in industrial, biomedical, and technological applications. They specifically target materials that are challenging to characterize by other methods because of their complexity, size, or topology. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.