Gauthier Deblonde

Gauthier Deblonde’s scientific journey explores the unknown edges of the periodic table, where rare, toxic, and elusive elements hold the keys to new materials for national security. As a Staff Scientist at Lawrence Livermore National Laboratory (LLNL), Deblonde synthesizes new compounds containing radioactive elements and heavy metals, pioneering strategies to harness their unique chemical properties. His work sits at the intersection of radiochemistry, biochemistry, and geochemistry, fields that shape our understanding of nuclear materials, environmental safety, and advanced purification technologies.

Path to Livermore

Deblonde’s story begins in a small town in France, where the population was a fraction of LLNL’s workforce and English was rarely spoken. “I grew up in France, in a pretty small town. The number of inhabitants was about one fifth of the Laboratory’s current population, and the number of English-speaking inhabitants was about zero,” he recalls. His academic ambitions led him to Paris, where he earned a double major in nuclear chemistry at Chimie ParisTech–PSL University, France’s most selective chemical engineering college. As a first-generation engineer and scientist, Deblonde broke new ground for his family by being the first to travel to the United States, arriving weeks after defending his PhD in physical and analytical chemistry.

California became the next chapter in his journey, where he started a postdoctoral appointment at Lawrence Berkeley National Laboratory. In 2019, Deblonde joined LLNL, drawn by Livermore’s reputation for world-class science and its mission-driven focus on serving the nation. “I always wanted to have a career at an institution that has a bigger purpose, something that helps society. The excellent science reputation of Livermore Lab naturally drove me towards it,” he says. Since 2020, he has served as a Staff Scientist, expanding his research and strengthening United States security through science and technology and by mentoring the next generation of nuclear chemists.

Mission-Driven Research and Collaboration

Deblonde’s research revolves around the chemistry of heavy metals and a diverse array of molecules, from inorganic minerals and nanoclusters to small organic molecules and proteins. “My team’s research is at the intersection of radiochemistry, biochemistry, and geochemistry,” he explains. The applications of his work are far-reaching: from advancing our understanding of nuclear materials to developing detection methods for elusive elements, innovating separation and purification technologies, and studying the interactions of heavy metals with the environment.

A significant portion of Deblonde’s work focuses on a class of radioactive elements known as actinides—the row of elements at the bottom of the periodic table that includes uranium and plutonium. “In a nutshell, I do chemistry at the edge of the periodic table,” he says. These elements are not only rare and difficult to study, but they are also essential to national security. Deblonde emphasizes the importance of maintaining a workforce skilled in radiochemistry: “Doing research on actinides is imperative for national security. If we look back in time, the inception of NNSA and the US nuclear enterprise was when scientists (including Dr. Glenn T. Seaborg) about 80 years ago were doing fundamental research and discovered a way to create plutonium and expanded the periodic table beyond the natural elements found on Earth. This literally changed the world.”

Looking forward, Deblonde notes that there is still much to learn about actinides. “There is still so much we don’t know about the chemical properties of actinides,” he says. Radiochemistry is critical not only for weapons and nuclear energy, but also for a range of applications that often go unnoticed by the general public. “You don’t really want to slow down progress and disrupt supply chains because there is a shortage of radiochemists; we must maintain this skillset domestically.”

What Drives Discovery

The path of a scientist is rarely straightforward, and Deblonde is candid about the challenges. “Being a scientist is tough; there is no manual or roadmap for this type of career. Scientists are not expected to just do world-class science, but also to manage projects, people, and resources,” he says. But the moments of discovery keep him motivated. “What keeps me going is those small moments in the lab when you make, discover or understand something new. For example, when our team succeeds in making new materials with actinide elements, like plutonium or americium, we know that we are the first ones to ever lay eyes on such materials. This has a very particular feeling, which is hard to describe, but these ‘a-hah moments’ are the best part of being a scientist.”

Working with radioactive and “difficult-to-study” materials brings unique challenges. “Imagine a sample that is the size of a grain of salt,” poses Deblonde. “Now imagine you only have one sample like this, and it costs a few thousand dollars and lots of paperwork to get it. Now imagine this sample is also super toxic and, if it touches you, you would be contaminated for life and have an increased risk of developing a cancer. That’s the kind of samples we are dealing with when we talk about elements like heavy actinides.”

To advance his research, Deblonde sees the need for increased funding, a larger team, and advanced facilities. “More funding and a bigger team always helps,” he says. The foundation is already strong, with LLNL’s interdisciplinary expertise and resources in place. “We just need to put the pieces together and LLNL could become a national hub for radiochemistry and heavy element chemistry research.”

Vision for the Future

The future of actinide chemistry holds vast potential, and Deblonde is optimistic about the breakthroughs on the horizon. “There is still a lot we don’t know about actinide elements. For example, if we compare plutonium to something more classic like iron, the number of publications available is about 100 times lower, and the number of plutonium compounds that have been discovered is ~500 times lower than for iron,” he notes. He anticipates that the gap will close as researchers become more efficient at synthesizing new materials and studying their chemistry. “By combining more efficient chemistry techniques, better research instruments, and advanced computing methods like AI and surpercomputing, we will certainly see exponential growth in terms of the knowledge on actinide elements.”

Deblonde’s work at LLNL exemplifies the power of curiosity, resilience, and collaboration in pushing the boundaries of scientific knowledge. His contributions not only advance the field of radiochemistry but also reinforce the Laboratory’s ability to safeguard national security through world-class science and technology. As Deblonde and his colleagues continue to explore the farthest reaches of the periodic table, their discoveries will shape the future of materials science, environmental safety, and nuclear technology.

Recognitions and Impact

Deblonde’s achievements have not gone unnoticed. He was named a 2024 “American Chemical Society Rising Star” and received a Department of Energy Early Career research award in 2023, highlighting his leadership in the field and future innovations in mission-driven research. His contributions have also been recognized with the Laboratory with two Director’s Awards: the Deputy Director's S&T Excellence in Publication Award in 2022 and a Science and Technology Award in 2025. 

As LLNL continues to build its capabilities in radiochemistry and heavy element science, Deblonde’s vision and expertise will be central to its efforts. “The best is still to come,” he says.