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In a development that could reshape how industries inspect pipelines and how doctors diagnose internal conditions, researchers at the Massachusetts Institute of Technology have engineered a sprayable aerosol packed with microscopic sensors capable of detecting specific chemicals in their environment. The work, published Monday in the journal Nature Nanotechnology, introduces a method for deploying these tiny devices over large areas or through complex systems, potentially eliminating the need for manual inspections.

The sensors, often referred to as nanobots, are each composed of two key components. The first is a colloid—an exceptionally small particle that remains suspended in air or liquid indefinitely because the constant molecular collisions around it outweigh the pull of gravity. This property allows the sensors to travel through air or fluids without settling. The second component is a circuit built from a two-dimensional material, such as graphene, which includes a chemical detector. When this detector encounters a target chemical, its electrical conductivity changes, signaling the presence of that substance. A built-in photodiode converts ambient light into electricity, powering the circuit's data collection and memory functions.

By grafting these circuits onto colloids, the researchers gave the sensors the ability to move through environments where traditional devices would fail. The combination was then aerosolized, creating a spray that can be released into a pipeline or other confined space. Lead author Michael Strano explained in a news release that the colloid substrate is essential: “The circuits can’t exist without a substrate. We need to graft them to the particles to give them mechanical rigidity and to make them large enough to get entrained in the flow.”

From Pipeline Inspection to Medical Diagnostics

The MIT team demonstrated the technology by designing sensors to detect ammonia, a toxic chemical often found in industrial settings. In their experiment, they sprayed the sensors into one end of a sealed pipe and collected them at the other using a piece of cheesecloth. Analysis of the sensors revealed that they had encountered ammonia, with the data stored in their memory confirming the contact.

In real-world applications, this approach could spare inspectors from manually examining entire pipeline lengths from the outside. Instead, they could release the aerosol into the system, let it travel through, and then retrieve the sensors to check for any chemical anomalies that might indicate a leak or contamination. The ability to detect foreign chemicals could serve as an early warning system for structural issues.

Beyond industrial use, the researchers envision a future where similar sensors travel through the human digestive tract, collecting data and relaying it to medical professionals. This could enable non-invasive diagnostics for a range of conditions, providing a more comfortable and efficient alternative to current procedures. Strano described the paper as “the introduction of a new field [in robotics],” suggesting that the potential applications extend far beyond what has been demonstrated so far.

The study adds to a growing body of research into cell-sized robots and their potential uses. While the technology is still in its early stages, the ability to deploy sensors via a simple spray could have significant implications for both infrastructure maintenance and healthcare, offering a cost-effective and scalable solution to monitoring challenges.