Scott K. Shaw
analytical chemistry, interface science, intermolecular forces, vibrational spectroscopy, electrochemistry, probe microscopy, surface science, PMIRRAS, SFG, VSFG, Raman, Ellipsometry, Polymer Films, Urban Films, CO2 Recyling, Ionic Liquid, RTIL, Biofilm, Adhesion, ultra-smooth surfaces, nano
Research in the Shaw group combines modern analytical techniques with materials and physical chemistry to create new understanding of the molecular-level behavior at interfaces. Current and start-up projects span chemical systems that are both fundamentally intriguing and extremely relevant to current needs of our technology-driven society. Advances in these areas will allow predictive design of new, improved devices in a range of applications including energy production, polymeric materials, corrosion science, environmental remediation, microfluidics, and biomedical implanted devices. A few selected projects are outlined below. Experimental techniques encompass surface-sensitive optical spectroscopies, non-linear spectroscopies, probe microscopies, electrochemical methods, tensiometry, and novel sample preparation techniques, all targeted at revealing the interfacial properties of otherwise opaque chemical systems.
Research Area 1: Intermolecular Interactions of Solvent with Soft-Material Interfaces
This project aims to develop the understanding of complex chemical interactions between solvent molecules and surfaces, and will impact fundamental surface science as well as applied materials chemistry. Employing the novel sampling geometry, dynamic dewetting, thin fluid layers are created on a carefully selected set of surfaces. The thin fluid films are examined to reveal chemical information specific to the interfacial environment. By tuning the ratio of surface-fluid and fluid-fluid interactions, the role of van der Waals forces, hydrogen bonding, micro-viscocity, and other chemical phenomena can be more adequately understood and applied to challenges in chemistry and materials science.
Research Area 2: Ionic Liquids as Advanced Materials
Ionic liquids are incredibly interesting and useful materials, and advanced study on their surface and interfacial properties is just beginning. At an interface, ionic liquids can self-assemble into very large domains of ordered materials, which could be useful as sensors, energy storage devices, or electronic materials. The Shaw group uses advanced spectroscopic techniques and sampling geometries to exclusively examine the interfacial regions on device relevant materials including metals, oxides, and graphene. A primary goal of this work is the implementation of ionic liquids in the remediation of atmospheric carbon dioxide and subsequent electrochemical reduction of CO2 to useful materials such as ethylene or methane.
Research Area 3: Environmental Surface Filmsl Imacts on Air and Water Quality
Biogenic and anthropogenic emissions enter the Earth’s atmosphere at a rate of millions of tons per day. After varying residence times, these emissions return to Earth’s surfaces in the form of complex environmental films, commonly recognized as window grime. These films can grow to thicknesses of 10’s of microns and act as environmental sponges, collecting persistent environmental pollutants within their volumes across vast urban and suburban landscapes. The Shaw group is actively researching the chemical profile and dynamics of these films. We hope to understand the role of the films’ chemical and physical morphology in the fate and transport of airborne pollutants.
Rural Scholars Program:
For details on the rural scholars program and a few of the participating students, please follow this link - https://shawgroup.lab.uiowa.edu/rural-scholars-research-program
Lucio, L. J., Shaw, S. K. (2018). Capacitive Hysteresis at the 1-Ethyl-3-methylimidazolium Tris(pentafluoroethyl)-trifluorophosphate – Polycrystalline Gold Interface. Journal of Analytical and Bioanalytical Chemistry, 1-12. Article in Forefront
Anaredy, R. S., Shaw, S. K. Developing Distinct Chemical Environments in Ionic Liquid Films. Journal of Physical Chemistry C. Accepted/In Press 2018.
Lucio, A. J., Shaw, S. K., Zhang, J., Bond, A. M. (2018). Double-Layer Capacitance at Ionic Liquid−Boron-Doped Diamond Electrode Interfaces Studied by Fourier Transformed Alternating Current Voltammetry. Journal of Physical Chemistry C, (122).
Lucio, A. J., Shaw, S. K. Effects and Controls of Capacitive Hysteresis in Ionic Liquid Electrochemical Measurements. Analyst. Accepted/In Press 2018
Nania, S. L., Wrona, J., Shaw, S. K. Effects of Fluid Confinement and Temperature in Supported Acetophenone Films. Journal of Physical Chemistry C. Accepted/In Press 2018 Cover Article
Durgaprasad, G., Luna, J. A., Spielvogel, K. D., Haas, C., Shaw, S. K., Daly, S. R. (2017). Ru(II) Complexes with a Chemical and Redox-Active S2N2 Ligand: Structures, Electrochemistry, and Metal−Ligand Cooperativity. Organometallics, 36(20), 4020–4031.
Hu, G., Pandey, G. P., Liu, Q., Anaredy, R. S., Ma, C., Liu, M., Li, J., Shaw, S. K., Wu, J. (2017). Self-Organization of Ions at the Interface between Graphene and Ionic Liquid DEME-TFSI. ACS Applied Materials and Interfaces, 9(40), 35437–35443.