Negin Bouzari found a hidden opportunity while reading an academic paper—one sentence that changed everything. The chemical engineering PhD candidate at the University of Waterloo realized that a research idea everyone had discussed for years had never been applied to the material system her team was working with. What followed was a breakthrough that could reshape how soft robots move.
Working with her supervisor Dr. Hamad Shahsavan and a small team of undergraduates—chemistry student Melanie Bouzanne, nanotechnology engineering student Micahel Ali, biomedical engineering student Nrushanth Suthaharan, and nanotechnology engineering student Edward Hong—Bouzari developed a simpler way to program tissue-like hydrogels that act as artificial muscles. The interdisciplinary collaboration, made possible through Waterloo's co-op program, brought together students who could contribute different expertise to solve a complex problem.
Hydrogels are soft, biocompatible materials with enormous potential for biomedical applications. Imagine tiny robots delivering medicine directly to the gastrointestinal tract or performing delicate procedures in the human body without invasive surgery—hydrogels make that vision possible. But the challenge has always been controlling how these materials move and change shape. Previous methods required multiple fabrication steps to create a hydrogel capable of bending and twisting. The Waterloo team found something simpler.
Their insight came from understanding hydrogel chemistry differently. Most molecules that form hydrogels have no electrical charge, but some carry both negative and positive charges. By combining these two types of molecules in water and placing the solution between two glass slides—one neutral and one electrically charged—the team discovered they could control how the material organized itself. Molecules attracted to charge moved toward the charged slide, while others moved toward the uncharged one. A burst of UV light then solidified the solution into a film with asymmetrical properties: one side soft, the other stiff. Suddenly, the glass slides themselves became the programming tool.
This creates hydrogels that can bend and change shape when exposed to environmental triggers like pH changes or salinity shifts—precisely the properties needed for artificial muscles in robots. The material even has self-healing capabilities, meaning pieces can be cut and reassembled into different shapes for different applications. Their work, published recently in the Journal of Materials Chemistry A, represents a meaningful advance in materials science achieved entirely by students learning while doing.
Edward Hong, a third-year nanotechnology engineering student on the team, emphasized why the collaboration mattered. "Interdisciplinary research brings complementary tools and viewpoints together, leading to creative, high-impact solutions," he said. More than innovation emerged from the partnership—students developed communication and adaptability skills that will serve them in industry and academia alike.
Dr. Shahsavan sees the project as evidence of what happens when students are genuinely trusted and supported to tackle challenging research. By bringing undergraduates into meaningful work early, by pairing them with graduate student mentors, and by encouraging curiosity sparked from reading a single sentence in an academic paper, universities create the conditions for discovery. The Waterloo team's simpler method for programming artificial muscles suggests that sometimes the most elegant solutions come from asking whether conventional wisdom might be incomplete.