Will Gutekunst, associate professor in the School of Chemistry and Biochemistry at Georgia Tech, co-leads the interface of polymer science and wood-based materials initiative along with Blair Brettmann at the Renewable Bioproducts Institute (RBI). Gutekunst’s research explores the design of novel monomers for the design of recyclable polymers for a circular economy, fluxional materials, and 3D-printable ceramics.

Below is a brief Q&A with Gutekunst where he discusses his research focus areas and how they influence the interface of polymer science and wood-based materials initiative at Georgia Tech.

• What is your field of expertise and at what point in your life did you first become interested in this area?

My graduate training is in synthetic organic chemistry, and I focused on basic science problems at that time. Toward the end of my Ph.D., I became interested in applying my skill set to new research directions that could have a more direct impact on society. This led me to pursue postdoctoral research in polymer chemistry, which has been a source of inspiration ever since.

• What questions or challenges sparked your current renewable bioproducts research? What are the big issues facing your research area right now?

My first project in this space was initiated shortly after I arrived at Georgia Tech through RBI funding opportunities, and it has continued to be a theme ever since. One of the critical problems in my research is identifying monomers that can polymerize and depolymerize on command. This involves balancing the driving force of polymerization (enthalpy) with the unfavorable process of confining multiple monomers to a single chain (entropy). While we are making considerable progress in engineering appropriate polymerization enthalpies into monomers, the entropic side of the problem remains a significant challenge.

• What interests you the most in leading the research initiative on the interface of polymer science and wood-based materials? Why is your initiative important to the development of Georgia Tech’s renewable bioproducts research strategy?

The most exciting aspect of the initiative is the ability to bring together multiple strengths of Georgia Tech to work on a central goal. Solving problems at this interface involves the collaborative efforts of researchers in chemistry, processing, separations, and even data science. Identifying and gathering synergistic teams is critical to address this problem and additional goals in renewable bioproducts.

• What are the broader global and social benefits of the research you and your team conduct on the interface of polymer science and wood-based materials?

The goal of this research is to develop materials that are more recyclable and are derived from abundant feedstocks, which are two big problems rolled into one. The eventual product of this research will be access to materials that are more compatible with the environment while also drastically reducing the waste output of society.

• What are your plans for engaging a wider Georgia Tech faculty pool with the broader renewable bioproducts community?

Through the merger of the Georgia Tech Polymer Network with RBI, we can start to forge collaborations across a broader swath of the Georgia Tech community. This includes the organization of workshops, making connections between different student groups, and the development of center grants to tackle grand challenges in the field.

• What are your hobbies? 

In my free time, I enjoy reading (non-science), pottery, and hiking.

• Who has influenced you the most?

My Ph.D. advisor (Phil Baran) and my postdoctoral advisor (Craig Hawker) both stand out in their impact on my scientific career. Through their guidance, I learned how to properly think about science and to always look ahead for the next big problem.

From keeping warm in the winter to doing laundry, heat is crucial to daily life. But as the world grapples with climate change, buildings’ increasing energy consumption is a critical problem. Currently, heat is produced by burning fossil fuels like coal, oil, and gas, but that will need to change as the world shifts to clean energy. 

Georgia Tech researchers in the George W. Woodruff School of Mechanical Engineering (ME) are developing more efficient heating systems that don’t rely on fossil fuels. They demonstrated that combining two commonly found salts could help store clean energy as heat; this can be used for heating buildings or integrated with a heat pump for cooling buildings.

The researchers presented their research in “Thermochemical Energy Storage Using Salt Mixtures With Improved Hydration Kinetics and Cycling Stability,” in the Journal of Energy Storage.

Reaction Redux 

The fundamental mechanics of heat storage are simple and can be achieved through many methods. A basic reversible chemical reaction is the foundation for their approach: A forward reaction absorbs heat and then stores it, while a reverse reaction releases the heat, enabling a building to use it.

ME Assistant Professor Akanksha Menon has been interested in thermal energy storage since she began working on her Ph.D.  When she arrived at Georgia Tech and started the Water-Energy Research Lab (WERL), she became involved in not only developing storage technology and materials but also figuring out how to integrate them within a building. She thought understanding the fundamental material challenges could translate into creating better storage.

“I realized there are so many things that we don't understand, at a scientific level, about how these thermo-chemical materials work between the forward and reverse reactions,” she said.

The Superior Salt

The reactions Menon works with use salt. Each salt molecule can hold a certain number of water molecules within its structure. To instigate the chemical reaction, the researchers dehydrate the salt with heat, so it expels water vapor as a gas. To reverse the reaction, they hydrate the salt with water, forcing the salt structure’s expansion to accommodate those water molecules. 

It sounds like a simple process, but as this expansion/contraction process happens, the salt gets more stressed and will eventually mechanically fail, the same way lithium-ion batteries only have so many charge-discharge cycles. 

“You can start with something that's a nice spherical particle, but after it goes through a few of these dehydration-hydration cycles, it just breaks apart into tiny particles and completely pulverizes or it overhydrates and agglomerates into a block,” Menon explained. 

These changes aren’t necessarily catastrophic, but they do make the salt ineffective for long-term heat storage as the storage capacity decreases over time. 

Menon and her student, Erik Barbosa, a Ph.D. student in ME, began combining salts that react with water in different ways. After testing six salts over two years, they found two that complemented each other well. Magnesium chloride often fails because it absorbs too much water, whereas strontium chloride is very slow to hydrate. Together, their respective limitations can mutually benefit each other and lead to improved heat storage.

“We didn't plan to mix salts; it was just one of the experiments we tried,” Menon said. “Then we saw this interactive behavior and spent a whole year trying to understand why this was happening and if it was something we could generalize to use for thermal energy storage.”

The Energy Storage of the Future

Menon is just beginning with this research, which was supported by a National Science Foundation (NSF) CAREER Award. Her next step is developing the structures capable of containing these salts for heat storage, which is the focus of an Energy Earthshots project funded by the U.S. Department of Energy’s (DOE) Office of Basic Energy Sciences.

A system-level demonstration is also planned, where one solution is filling a drum with salts in a packed bed reactor. Then hot air would flow across the salts, dehydrating them and effectively charging the drum like a battery. To release that stored energy, humid air would be blown over the salts to rehydrate the crystals. The subsequently released heat can be used in a building instead of fossil fuels. While initiating the reaction needs electricity, this could come from off-peak (excess renewable electricity) and the stored thermal energy could be deployed at peak times. This is the focus of another ongoing project in the lab that is funded by the DOE’s  Building Technologies Office.

Ultimately, this technology could lead to climate-friendly energy solutions. Plus, unlike many alternatives like lithium batteries, salt is a widely available and cost-effective material, meaning its implementation could be swift. Salt-based thermal energy storage can help reduce carbon emissions, a vital strategy in the fight against climate change.

“Our research spans the range from fundamental science to applied engineering thanks to funding from the NSF and DOE,” Menon said. “This positions Georgia Tech to make a significant impact toward decarbonizing heat and enabling a renewable future.”

When Blair Brettmann was a sophomore at the University of Texas at Austin, her advisor told her about the National Science Foundation’s Research Experience for Undergraduates (REU) program. The summer program enables undergraduates to conduct research at top institutions across the country. Brettmann spent the summer of 2005 at Cornell working in a national nanotechnology program — a defining experience that led to her current research in molecular engineering for integrated product development. 

“I didn't know for sure if I wanted to attend grad school until after the REU experience,” Brettmann said. “Through it, I went to high-level seminars for the first time, and working in a cleanroom was super cool.” 

Her experience was so positive that the following summer, Brettmann completed a second REU at the Massachusetts Institute of Technology, where she eventually earned her Ph.D. Now an associate professor in Georgia Tech’s School of Chemical and Biomolecular Engineering and School of Materials Science and Engineering and an Institute for Matter and Systems faculty member and an initiative lead for the Renewable Bioproducts Institute, Brettmann is an REU mentor for the current iteration of the nanotechnology program — now taking place at Georgia Tech. 

Brettmann’s mentee this summer, Marissa Moore, is having a similarly positive experience. A rising senior in chemical engineering at the University of Missouri-Columbia (Mizzou), Moore was already familiar with Georgia Tech because her father received his chemical engineering Ph.D. from the Institute; she hopes to do the same. Her passion for research began as she grew up with her sister, who had cerebral palsy and epilepsy. 

“We spent a lot of time in hospitals trying out new devices and looking for different medications that would help her, so I knew I wanted to make a difference in this area,” she said. 

But Moore wasn’t interested in being a doctor. Instead, she wanted to develop the materials that could be a solution for someone like her sister. Her undergraduate research focuses on materials and biomaterials for medical applications, and Georgia Tech is enabling her to deep-dive into pure materials science. 

“What I'm working on at both universities is biodegradable polymers, but at Mizzou I’m developing that polymer from the ground up, and at Tech I’m using the properties of the polymer and finding how to make them,” she explained. 

Having the opportunity to work in nanotechnology through the Institute for Materials and use Georgia Tech’s famous cleanroom made this REU stand out for Moore. 

“I had never been in the cleanroom before, so that was one of the most eye-opening experiences,” she said. “It was cool to gown up and learn all of the safety precautions.” 

For Brettmann, hands-on research experiences like this make the REU program unique — and crucial — for potential graduate students. 

“Having your experiments fail, or even having things not turn out as you expect them to is an important part of the graduate research experience,” she said. “One of the best things about REU is it can be a first experience for people and help them decide what to do in grad school later on.”

The Bark Rhythms exhibit continues at the Robert C. Williams Museum of Papermaking through August. It features historical examples of hand-beaten bark papers, barkcloths, and traditional beaters, paired with the work of contemporary artists from global communities who use bark fiber materials and techniques. Photos taken June 24 by Joya Chapman.

Chaouki Abdallah, Georgia Tech's executive vice president for Research (EVPR), has been named the new president of the Lebanese American University in Beirut.  

Abdallah, MSECE 1982, Ph.D. ECE 1988, has served as EVPR since 2018; in this role, he led extraordinary growth in Georgia Tech's research enterprise. Through the work of the Georgia Tech Research Institute, 10 interdisciplinary research institutes (IRIs), and a broad portfolio of faculty research, Georgia Tech now stands at No. 17 in the nation in research expenditures — and No. 1 among institutions without a medical school.  

Additionally, Abdallah has also overseen Tech's economic development activities through the Enterprise Innovation Institute and such groundbreaking entrepreneurship programs as CREATE-X, VentureLab, and the Advanced Technology Development Center. 

Under Abdallah's strategic, thoughtful leadership, Georgia Tech strengthened its research partnerships with historically Black colleges and universities, launched the New York Climate Exchange with a focus on accelerating climate change solutions, established an AI Hub to boost research and commercialization in artificial intelligence, advanced biomedical research (including three research awards from ARPA-H), and elevated the Institute's annual impact on Georgia's economy to a record $4.5 billion.  

Prior to Georgia Tech, Abdallah served as the 22nd president of the University of New Mexico (UNM), where he also had been provost, executive vice president of academic affairs, and chair of the electrical and computer engineering department. At UNM, he oversaw long-range academic planning, student success initiatives, and improvements in retention and graduation rates. 

A national search will be conducted for Abdallah's replacement. In the coming weeks, President Ángel Cabrera will name an interim EVPR. 

 

Students in the Pulp and Paper Certification Program at Georgia Tech had real-world experiences outside the classroom this spring. Over 30 students taking the Emerging Technologies in the Manufacture of Forest Bioproducts course (CHBE/ME 4730/8803) took field trips to Greif’s Austell location and GranBio’s Thomaston facility in Georgia. The course is taught by Chris Luettgen, professor of the practice and initiative lead for the process efficiency & intensification of pulp paper packaging & tissue manufacturing initiative at Georgia Tech's Renewable Bioproducts Institute. 

At the Sweetwater Mill, one of Greif’s three paper mills in Austell, students saw the pressure cylinder machine, a pre-coater that smoothens the board for printability, and a curtain coater that makes value-added products such as one-sided chipboard packaging for retail displays. The mill runs 100% recycled fiber into stock cores, gypsum board liners, and chipboard packaging. The tour included converting the machine roll (called a parent roll) into smaller rolls that will be further converted at downstream customers’ locations. 

At the GranBio’s facility in Thomaston, Tech students were able to see a biorefinery at work where a wide variety of lignocellulosic feedstocks, including wood chips, were getting converted into multiple bioproducts. They had a firsthand look at the SEW (sulfur dioxide, ethanol, and water) process, which was quite different from the traditional kraft pulping process. It creates a highly acidic mush, with a high pH, instead of fiber, which could then be used to make biofuels and other value-added products. In addition, they were able to discuss the recent DOE award to scale their process to a 100 ton/day biomass to Sustainable Aviation Fuel (SAF).  The company explained that they were still in site selection and would be hiring engineers in the near future.

About the Pulp and Paper Certification

The College of Engineering at Georgia Tech offers a certificate program in pulp and paper. The certificate consists of 12 credit hours focused on forest bioproduct topics, including lecture- and laboratory-based courses. Since its inception in 1990, more than 100 students have completed their certification.

The foundational course in the program introduces students to the history of pulp and paper manufacturing from its origins and covers the forest bioeconomy, wood structure, chemistry, and fiber morphology, and goes through the unit operations utilized to transform lignocellulosic feedstocks into value-added products, including chemical and mechanical pulping, recycled fiber operations, chemical recovery, bleaching, stock preparation, and papermaking.

The emerging technologies course focuses on the future of bioproducts industries. Case studies on the use of biomass in the production of value-added products are covered. Included are fluff pulp and dissolving pulps, alternative fibers, specialty papers, packaging, and printed electronics, biorefining technologies, nanocellulose and bio composites, and renewable polymers.

The pulp and paper laboratory course introduces students to pulping operations, bleaching, hand sheet formation, pulp and paper physical properties, and recycled fiber. The final course allows students to pursue research on special problems under supervision from an RBI-affiliated faculty.

Blair Brettmann, associate professor, Solvay Faculty Fellow, and Raymond and Stephanie Myers Faculty Fellow in the School of Chemical and Biomolecular Engineering, co-leads the interface of polymer science and wood-based materials initiative with Will Gutekunst at Georgia Tech’s Renewable Bioproducts Institute. 

Brettmann’s current research focuses on developing technologies that enable multicomponent, rapidly customizable product design, with a specific focus on polymer systems. 

Brettmann received her Ph.D. in chemical engineering at MIT in 2012 working with the Novartis-MIT Center for Continuous Manufacturing under Bernhardt Trout. Later, she worked on polymer-based wet coatings and dispersions for various applications at Saint-Gobain Ceramics and Plastics. She went on to serve as a postdoctoral researcher in the Institute for Molecular Engineering at the University of Chicago with Matthew Tirrell. Below is a brief Q&A with Brettmann in which she discusses her research focus areas and how they influence the interface of polymer science and wood-based materials research at Georgia Tech.

• What is your field of expertise and at what point in your life did you first become interested in this area?

My expertise is in polymer science and materials design for manufacturability. I got excited about this area after my Ph.D. when I worked for Saint-Gobain and saw firsthand the challenges of bringing new products to market, especially those made of complex mixtures of materials. 

• What questions or challenges sparked your current renewable bioproducts research? What are the big issues facing your research area right now?

Sustainability of materials and process is a top priority right now across many industries, and renewable bioproducts research is helping to improve this. But it is still tough to design and scale up products made with these materials because of the heterogeneity of the raw bio-based materials and recycled materials that now serve as the raw materials. Engineers are essential to design systems that can be robust despite the heterogeneities and still produce consistent, high-quality products.

• What interests you the most in leading the research initiative on the interface of polymer science and wood-based materials? Why is your initiative important to the development of Georgia Tech’s Renewable Bioproducts research strategy?

One of the most promising directions to decrease the impact of plastics on the environment is to replace some of the synthetic plastic materials with natural products, such as cellulose from wood. My initiative aims to build better connections between polymer scientists working to design improved plastics and experts in bio-based materials to seed research that can work toward this goal. Polymers also serve as important tools to improve the properties of cellulose and wood-based products and can enable new materials with increased functionality that still have sustainable materials at their core.

• What are the broader global and social benefits of the research you and your team conduct on the interface of polymer science and wood-based materials?

We work to improve the sustainability of material products while addressing specific challenges related to manufacturing and scale-up, which can speed up the adoption of these more sustainable products in industry. We take a wide view of the problem and have even worked on a project to understand consumer choices in recycling: If people don’t recycle the material, our efforts to make recyclable products will not have an impact!

• What are your plans for engaging a wider Georgia Tech faculty pool with the broader renewable bioproducts community?

Using symposia, social events, and student-centered networking, I will bring the broad Georgia Tech Polymer Network community together with the RBI community.

• What are your hobbies?

Water polo and swimming. I train with the Atlanta Rainbow Trout, who practice at the Georgia Tech pool.

• Who has influenced you the most?

 I’m constantly learning from people around me!