What do we do?
Data Science Integrated with Chemistry, Modeling and Simulation – Applied to Study Solutions and Their Interfaces
What do we value?
“We pursue scientific truth.” (Dan Pope, PhD student)
The Clark lab recognizes that pursuit of truth goes hand in hand with the just and honorable treatment of all people. We are lifelong learners that do not do not become complacent in our knowledge. Recognizing our individual strengths and weaknesses, we seek to teach our colleagues our strengths and learn from others to grow from our weaknesses. We are honest and forthright, challenging each other to grow as scientists and human beings. Our group is diverse, accepting, and respectful of each other and our personal and cultural backgrounds. We all succeed when we support each other as a team and as individuals.
A Window Into Our Projects
1) Graphs, Topology and Geometry – The Integration of Applied Mathematics and Chemistry
Simulation data contains much more information than we often consider. Why not use the patterns and shapes of data from simulation to explore and generate new knowledge that we might miss using chemical intuition alone? Our group develops graph theory techniques based upon networks of chemical interactions to identify complex correlations of behavior across time and length scales. We apply techniques of topological data analysis and geometry to identify hierarchically organized structures in complex chemical systems and to probe the energy landscapes that underpin chemical transformations.
A Geometric Measure Theory Approach to Identify Complex Structural Features on Soft Matter Surfaces, Journal of Chemical Theory and Computation, 2020, ASAP article. DOI: 10.1021/acs.jctc.0c00260.
PageRank as a Collective Variable to Study Complex Chemical Transformations and Their Energy Landscapes, The Journal of Chemical Physics, 2019, 150, 134102. DOI: 10.1063/1.5082648
2) Complex Multicomponent Solutions
Solutions that contain more than 1 solute type are pervasive, underpinning chemical synthesis (catalysis), purification, and the cleanup of contaminated sites that affect human health. There are many transcending characteristics of complex solutions, for example their properties cannot be described without many body effects. They also exhibit close coupling of different length and timescale behavior. In multicomponent systems the degrees of freedom are increased dramatically: local organization of solutes into a supramolecular assembly can then create a percolated network of aggregated assemblies that in turn supports a phase transition. Or, in a concentrated electrolyte, the local motions of water are coupled to longer length scale dynamics of evolving ion solvation networks. The collective organization of the solution across different length scales and the dynamic motion across time-scales, challenges study of the features of the underlying free energy landscape (minima and barriers) that directs reaction outcomes, kinetics of motion and reactions, and phase behavior. To truly understand multicomponent complex solutions our group takes a holistic view to understand and create both a local and global description from state-of-the-art simulations.
Servis, M. J.; Martinez-Baez, E.; Clark, A. E. Hierarchical Phenomena in Multicomponent Liquids: Methods, Analysis, Chemistry. Physical Chemistry Chemical Physics 2020, 22, 9850-9874. DOI: 10.1039/D0CP00164C.
Martinez-Baez, E.; Pearce, C.; Schenter, G.; Clark, A. E. 27Al NMR chemical shift of Al(OH)4– calculated from first principles: Assessment of error cancellation in chemically distinct reference and target systems. Journal of Chemical Physics. 2020. 152, 134303. DOI: 10.1063/1.5144294
3) Complex Liquid Interfaces
Liquid/liquid interfaces support a number of important chemical processes, from enhanced reactivity, to transport phenomena associated with chemical purification. Although they are highly heterogeneous, we use modeling and simulations to create a molecular-scale understanding of the balance of forces that tune their reactivity. We elucidate mechanisms of reactions, changes to speciation, and the formation of hierarchically organized structures that cause unique microenvironment for transport. These efforts are currently focused upon optimizing transport in solvent extraction for chemical purification and environmental cleanup.
Liu, Z.; Clark, A. E. An Octanol Hinge Opens the Door to Water Transport, Chemical Science, 2021, Advance Article, DOI: 10.1039/D0SC04782A
Kumar, N. ; Servis, M. J.; Liu, Z.; Clark, A. E. Competitive Interactions at Electrolyte/Octanol Interfaces – A Molecular Perspective. Journal of Physical Chemistry C. 2020, 124, 10924–10934 DOI: 10.1021/acs.jpcc.0c00302
PhD Positions: Join our team and develop new data science methods in chemistry, or inspire a new understanding of complex solution and their interfaces. You PhD will be the foundation of a successful career at a National Laboratory, in industry, or in academia. A number of fellowships are available, including the WSU-PNNL Distinguished Graduate Research Program, and US citizens are eligible for fellowships as part of a NNSA sponsored Enabling Technologies Consortium. Interested students are encouraged to email Prof. Clark!
- Congrats to Zhu Liu for his publication in Chemical Science on the molecular hinge mechanism of solute transport in octanol/water interfaces!
- Postdoc Michael Servis in joining the staff at Argonne National Laboratory within the Chemical Separations Group
- PhD ’16 alum Dr. Chun-Hung Wang will be starting as an Assistant Professor at Northland Pioneer College in the Fall of 2020
- Congrats to Nitesh Kumar for passing his written preliminary exam and on his first publication (with supplementary cover art!) DOI: 10.1021/acs.jpcc.0c00302
- Congrats to Will Smith for advancing to PhD candidacy!