So, a Chemist at the National University of Lesotho (NUL), Khauhelo Masoebe, figured out a simple and cheap way to build the smallest materials that can help repair broken bones, among other things. The materials are called Calcium Phosphate Nanoparticles!
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Brought to you by NUL Innovation Hub (Where Academia Meets Industry) & MILCO (a store that sells only Lesotho products at Sefika Complex). MILCO was founded by NUL Innovation Hub

Today we’re going to plunge into a little bit of Chemistry. Prepare popcorn. It will be a soft ride!

So what’s his secret in creating the material? It’s using little droplets of oil and water as tiny factories. This specific method is known as a microemulsion system. Think of it as creating a perfectly mixed, clear salad dressing that never separates, but on a scale so small it’s hard to imagine.

Here’s how he built his nano-factories from the ground up. First, he created two separate water-in-oil mixes, each in its own flask. In Mixture A, the tiny water droplets were filled with calcium ions. In Mixture B, the water droplets contained phosphate ions. Both were suspended in heptane (the oil) and stabilized by a chemical (surfactant) called sodium dioctyl sulfosuccinate (AOT)….that’s the “soap” that stops the water and oil from separating, forming billions of small, nanodroplets.

By tweaking just one key ingredient—the water-to-surfactant ratio, or ω (omega); he could precisely control the size of these nanodroplets. This was the master dial for the whole operation. A small ω meant tiny, cramped droplets; a larger ω meant bigger, more relaxed ones.

The real magic started when he slowly combined Mixture A and Mixture B and let them stir. This is where the “factories” got to work.

The surfactant membrane surrounding each water droplet is like a sieve, allowing the calcium and phosphate ions to slowly go through, meet at the oil-water interface, and begin their chemical reaction. The droplet’s size, dictated by ω, directly controlled the “workspace” for the growing crystals. A small, cramped factory (low ω) only had space to produce tiny, perfect nanospheres. A bigger factory (higher ω) gave the particles the room they needed to explore more complex shapes like cubes, rods, or plates.

“At just the right setting, something really cool happened: the cubes started lining up in rings all by themselves,” he revealed. Well, it’s the kind of surprise that makes a scientist lean back and say, “Huh, that’s neat.”

But the story gets even more interesting. These particles aren’t static; they change over time, almost like they’re growing up. Masoebe didn’t just look at them once; he kept checking over days and weeks in a process called aging. He watched as cubes, once formed, slowly stretched into rods as the internal structure reorganized. Rods, in turn, could flatten into thin sheets. It turns out these materials have their own little life cycles, changing based on time and temperature.

Speaking of temperature, turning up the heat made everything happen in fast-forward, with shapes that usually took days appearing in minutes, as if the particles were impatient to form. But letting things unfold slowly at lower temperatures revealed a whole hidden world of transitions. It’s a great reminder that sometimes, the best science doesn’t rush.

So why should we care?
Because these custom-shaped particles are a big deal for medicine. They’re the same stuff our bones are made of, so the body knows and likes them. They can help repair bone, make implants less creepy to our bodies, deliver drugs right where they’re needed, and help grow new tissue. And different jobs need different shapes; a cube works differently than a sphere.

The best part? His method is green, affordable, and doesn’t need a million-dollar lab. It’s the kind of smart, accessible science that can make a real difference all over the world.

In the end, Masoebe’s work shows sometimes the biggest advances come from just understanding the small stuff…like how to guide the growth of invisible crystals in a droplet of water, using little more than oil, water, and a whole lot of patience.
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Brought to you by NUL Innovation Hub (Where Academia Meets Industry) & MILCO (a store that sells only Lesotho products at Sefika Complex). MILCO was founded by NUL Innovation Hub