Potential Student Research Projects

Below is a list of potential research projects for students joining the Bredesen Center. Please note these are only a few of the projects available for students admitted to the program. Please feel free to contact any ESE or DSE faculty researcher with questions.

For more information or to apply to the Bredesen Center follow these application instructions:

Application Info

Dr. Kai Xiao

2D Quantum Materials and Devices Project

In this PhD project you will reveal new properties of novel 2D quantum materials that are composed of atomically-thin layers by advancing their synthesis and processing, performing state-of-the-art methods for their optical and electronic characterization, and fabricating prototype quantum devices. You will be working within a team comprised of experienced postdocs and staff (as well as other students) in the Functional Hybrid Nanomaterials group at the Center for Nanophase Materials Science involved in each aspect of this process, including the growth, characterization, and application of atomically-thin layers of 2D materials such as graphene, boron-nitride, and transition metal dichalcogenides (TMDs, such as MoS₂ , MoSe₂, WS₂, WSe₂, PdSe₂, etc.) as well as 2D topological insulators, and semimetals that are emerging quantum materials. You will explore the growth and properties of new 2D materials, learning and interfacing with experts in in situ diagnostics of growth by chemical vapor deposition and pulsed laser deposition, optical and electron spectroscopy characterization techniques, and device physics including nanofabrication techniques. The overarching goal is the development of quantum devices based on various 2D layered materials and heterostructures by exploring and exploiting their emerging quantum properties, which may include new metallic, semiconducting, magnetic, or superconducting quantum phases based on their quantum confinement or topology. You will learn and develop methods for transferring and combining various quantum materials from bottom-up and top-down assembly techniques in order to explore such novel quantum properties of these materials and their heterostructures for quantum information science, focusing on a particular material and emergent property. You will perform advanced synthesis and characterization experiments in the state-of-the-art laboratories at CNMS, work on novel device fabrication in the modern clean room and collaborate with various groups at ORNL on quantum materials and technology.

Interested students should have a background in Electrical engineering, Materials Science, Physics, Chemistry, or related discipline.

If you have questions, please contact Dr. Kai Xiao at xiaok@ornl.gov.

Dr. Michael Hu

Energy and Transportation Sciences Division at ORNL

We intend to look for a good graduate student candidate to work on our nanomaterials (membranes/adsorbents/catalysts) research for renewable energy and environmental applications. The student will become part of our separations team as well as part of the Bioprocessing Separations Consortium program that involves on-going collaborations among multiple national laboratories. The successful candidate will conduct complex research in membrane/adsorbent materials synthesis and separation/purification process development for thermochemical processing of biomass to biofuels and high-value chemicals. Research will include development of advanced materials including ceramic/polymeric/graphene-based membranes that contain tailor-designed nanostructures and chemical functionalities for enhanced water/ion transport, highly selective organic molecule extraction processes, and separation-enhanced catalytic conversion. These future generations of hybrid or composite membranes may include a variety of functionalized nanomaterials such as nanoporous inorganic (ceramic/metallic) supports, polymer or cross-linked graphene coatings, inorganic composites, and mixed matrix materials. The research spans basic to applied research in in bioenergy, transportation, and energy storage programs. The candidate will be expected to work in multi-disciplinary teams. The Bioprocessing Separations Consortium is a highly collaborative interdisciplinary team of chemical engineers, material scientists, physical chemists, electrochemists and biochemical engineers/scientists working toward advance functional materials for separations and catalytic conversions of biomass and derived intermediates; more information can be found at www.bioesep.org. The candidate will be encouraged to collaborate with the consortium team as well as other ORNL postdocs/researchers and actively present results at team meetings and conferences.

If you have questions, please contact Dr. Michael Hu at hum1@ornl.gov.

Dr. Shih-Chieh Kao

Dr. Kao leads the Hydrologic Systems Analysis Team in the Environmental Sciences Division at Oak Ridge National Laboratory. Dr. Kao’s team carries research related to (1) hydro-climate simulation, (2) extreme precipitation and flood modeling, (3) climate change impact assessment, (4) geographic information system applications, and (5) water availability for energy production.

Current projects include:

Evaluate the effects of climate change on hydropower generation
Simulation and evaluation of probable maximum precipitation and flood
Application of point precipitation frequency estimates to watersheds
Conterminous US (CONUS) hydrologic modeling
Simulation and validation of extreme flood events using GPU-accelerated high-resolution hydrodynamic models

If you have questions, please contact Dr. Shih-Chieh Kao at kaos@ornl.gov.

Dr. Moetasim Ashfaq

Dr. Ashfaq research focuses on the development of approaches that can reliably identify the dominant mechanisms governing the climate system response at global, regional and hydrologic-basin scales, quantify the model-based uncertainties associated with those physical processes, and create a foundation of a multi-disciplinary Earth System modeling framework that will enable more comprehensive, rigorous investigation of the challenges posed by climate variability and climate change.

Students will participate in the execution of regional earth system model experiments and in the development of robust analytical and modeling strategies to enable 1) a mechanistic understanding of dynamic and thermodynamic drivers of large-scale mesoscale patterns that are associated with multivariate weather and climate extremes (such as droughts, heat waves, wet extremes) at regional to continental scales, and 2) investigation of the impacts of variations in climate extremes on natural and human systems.

Current research activities include:

Design and execution of high-resolution regional earth system modeling experiments over the regions of interest and in the development of new methods for the identification of modeling errors.
Exploration of existing and new methods for the development of analytical metrics to identify atmospheric patterns associated with extremes events and their relationship with local and remote processes.
Development of a model analysis software for Energy Systems.
Investigation of the impacts of climate variability and change on natural and human systems

If you have questions, please contact Dr. Moetasim Ashfaq at mashfaq@ornl.gov.

Dr. Frank Loeffler

The Loeffler research group explores microbial processes in environmental systems that affect the fate and longevity of contaminants and control carbon and nitrogen cycling and associated greenhouse gas (e.g., nitrous oxide, N₂O) emissions. A collaborative project seeks to determine if the abundance and taxonomic diversity of N₂O-reducing bacterial species (phylogenetic diversity), as well as the activity of diverse nosZ gene alleles (genetic diversity), can predict the N₂O reduction rates and N₂O emissions (functional diversity) of representative U.S. terrestrial ecosystems.

Interested students should have a background in microbiology, chemistry and/or
environmental engineering, and a keen interest in advancing fundamental understanding of microbial systems and how they control relevant environmental processes.

If you have questions, please contact Dr. Frank Loeffler at frank.loeffler@utk.edu.

Dr. Chad Duty

Dr. Duty’s research group is investigating new materials that are suitable for 3D printing (additive manufacturing). In contrast to conventional desktop printing of simple thermoplastics, Duty’s group focuses on printing of high temperature reinforced composite materials and novel printing techniques, including Big Area Additive Manufacturing (BAAM) which prints structures on the order of several meter at a rate of 200x faster than conventional techniques. Duty’s research group works closely with ORNL’s Manufacturing Demonstration Facility on projects such as:

“Printability” Model: A viscoelastic model that maps appropriate processing conditions for printing of high performance polymers and reinforced composites.
Liquid Nails: A patent-pending approach for 3D Printing that uses “liquid nails” to improve the bond between printed layers, which has traditionally been the weakest link in 3D printed structures.
Controlling Distortion: As plastic solidifies, it shrinks. For 3D printing, this produces a large amount of distortion, especially for large parts. Duty’s research is working to change the print paths and the local material composition to develop methods for controlling distortion in a printed part.
High Temperature Tooling: Aerospace and automotive companies use large and complex molds (or “tools”) to define the shape of composite parts, which are formed at high temperatures and pressures in an autoclave. In collaboration with ORNL, Duty’s group is using the high temperature materials they’re developing to print and test these tools for production, cutting the time and money required for making components significantly.
Fatigue Life: Several applications where 3D printing of metals is attractive are limited by fatigue behavior. Duty’s group has been investigating how different printing conditions affect the microstructure of the material, and how this in turn affects the fatigue life of high performance titanium parts.

If you have questions, please contact Dr. Chad Duty at cduty@utk.edu.

Dr. Melanie Mayes

Wetland Soil Biogeochemical Cycling Project

This work will focus on soils, geochemistry, and microbial communities. Research topics will be experimental in nature and will be designed to improve the model representation of redox-active microbial functions in tropical wetlands and soils. Expertise or interest in microbial community function, wetland biogeochemistry, greenhouse gas emissions, and redox reactions in subsurface materials is desired. Students will have the flexibility to explore interests in microbial community function, wetland biogeochemistry, greenhouse gas emissions, and redox reactions in subsurface materials.

Students will have the opportunity to interact closely with a team consisting of soil biogeochemists, modelers, and a bioinformaticist to investigate relations between geochemical and microbiological features of wetland soils and greenhouse gas releases. The research will involve lab- and field-scale measurements of greenhouse gas emissions, microbial metagenomics, and soil geochemistry. Students are expected to work closely with modelers who will utilize experimental data and observations to improve and develop microbial models. Research will involve literature review and data analysis. Participation in scientific conferences and publication of results is expected.

Qualities essential for this position are:

A real passion for understanding the natural world
The ability to communicate clearly and effectively, in oral and written forms
Competence in statistical techniques
Self-motivation and goal setting skills
Ability to work in a collaborative environment
BS or MS in Environmental Science, Biogeochemistry, Microbiology, Soil Science, or a related discipline

If you have questions, please contact Dr. Melanie Mayes at mayesma@ornl.gov.

Dr. Bruce Pint

Dr. Pint leads the Corrosion Science and Technology Group in the Materials Science and Technology Division at Oak Ridge National Laboratory. The group covers all forms of corrosion for power generation and transportation but specializes in high temperature issues.

Current projects include:

Molten salt compatibility for concentrated solar power thermal storage and working fluid for nuclear energy. Critical issues remain to be addressed to define economical operating windows for this technology.
Supercritical carbon dioxide compatibility is of interest for concentrated solar power, fossil energy and nuclear energy. This technology offers much higher efficiencies but compatibility with affordable structural alloys is needed to lower the cost.
Development of Integrated Computational Materials Engineering (ICME) models for high temperature oxidation performance. This is a critical missing link in the development of the next generation of high temperature materials for transportation and power generation.
Lifetime performance models are needed in a variety of areas including thin-walled heat exchangers. National laboratories are able to generate longer-term data sets than universities but the key next step is to harness this information into a predictive model for the design of next generation systems for transportation and power generation.

If you have questions, please contact Dr. Bruce Pint at pintba@ornl.gov.

Dr. Arash Shaban-Nejad

Dr. Arash Shaban-Nejad’s lab in the UTHSC-Oak Ridge National Lab (ORNL) Center for Biomedical Informatics at the University of Tennessee Health Science Center offers multiple research assistantship positions to work on projects in medical and public health informatics, epidemiologic surveillance, precision medicine and big-data analytics in healthcare.

Students will find opportunities to tackle real world computational challenges in public health and medicine through the use of tools and techniques from artificial intelligence, natural language processing, machine learning, social media analytics, knowledge representation, and semantic web.

If you have questions, please contact Dr. Arash Shaban-Nejad at ashabann@uthsc.edu.

Dr. Zili Wu

(Center for Nanophase Materials Sciences at ORNL)

Photocatalysis Project

The research project (taking place at CNMS of ORNL) will be focused on converting small molecules such as water, CO₂, and N₂ into useful chemicals and fuels such as H₂, alcohols and NH₃ with the help of low dimensional photocatalysts/photoelectrocatalysts. Desired student may have research background or interest in the area of energy conversion, heterogeneous catalysis, photocatalysis, electrocatalysis, physical chemistry and material chemistry. Interest in in situ/operando spectroscopy characterization of catalysts and surface chemistry is also welcome.

If you have questions, please contact Dr. Zili Wu at wuz1@ornl.gov.