Omar Yaghi, a chemist at the University of California, Berkeley, has spent three decades building materials that shouldn’t exist — at least not according to conventional chemical wisdom. That work earned him a share of the 2025 Nobel Prize in Chemistry, and he believes it may define what comes after the silicon age.
The materials in question are metal-organic frameworks, known as MOFs, and their close relatives covalent organic frameworks (COFs). What makes them remarkable is not what they contain, but how empty they are. In 1999, Yaghi and his team synthesized a zinc-based compound called MOF-5 so riddled with microscopic pores that just a couple of grams held an internal surface area comparable to a football field.
The outside of the material was, in practical terms, far smaller than its inside. That paradox is the point.
Building Matter One Molecule at a Time
Yaghi’s discipline, reticular chemistry, treats molecule assembly the way an architect treats construction. The goal is to link chemical building blocks into ordered, crystalline structures with predictable geometry — something closer to Lego than to conventional mixing.
The problem is that chemistry resists order. When most building blocks are combined, they join in ways that are disordered and difficult to characterize. The laws of physics favor entropy. Creating crystals by design, rather than by accident, meant fighting that tendency directly.
“It’s a bit like asking a room of kids to make a perfect circle,” Yaghi said. “It takes hard work, and when they do it, they can still dissociate or ‘un-hold’ hands.” He compared the challenge to replicating what nature does when it crystallizes diamonds over billions of years — but accomplishing it in a single day.
The breakthrough came from identifying a solvent that could moderate the drift toward disorder during synthesis. That method has since been adopted by thousands of researchers worldwide.
What the Pores Can Do
Because MOFs contain so much accessible internal space, other molecules can be drawn into them. That property opens up a range of practical applications. The materials have shown promise in harvesting water directly from arid desert air, capturing carbon dioxide from the atmosphere, and storing gases at scale.
Yaghi did not set out to solve those problems. “When we started working with MOFs, we didn’t think we would be addressing societal challenges — it was an intellectual challenge,” he said. The utility came after the curiosity.
Once the porosity was understood, the applications became more obvious. “These materials encompass compartments of space where a molecule of water or carbon dioxide or something else can sit,” Yaghi explained. The structure essentially creates a vast number of microscopic traps.
Simplicity as a Design Principle
Yaghi draws a direct line between how he cooks and how he does chemistry. He prefers dishes that require no more than three steps and avoid unnecessary ingredients. That same instinct shapes his lab work: keep the process simple, use only what is needed, and still arrive at something exceptional.
He frames the broader arc of human history in material terms — the Stone Age, the Bronze Age, the silicon age. MOFs and COFs, in his view, are the foundation of what comes next. Whether that claim holds will depend on whether these materials can move from the lab to the scale of the world’s problems. Yaghi, at minimum, is not hedging.
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