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Most people know matter in three familiar forms: solid, liquid and gas. Far fewer are aware of a fourth state, plasma, even though it is arguably the most abundant form of matter in the universe and, closer to home, one of the most industrially useful. From the smartphone screen you are reading this on to the sterilised instruments used in Bahrain’s hospitals, plasma technology quietly touches daily life across the Gulf in ways that rarely get noticed.
What exactly is plasma? Plasma forms when a gas is heated to very high temperatures or subjected to a strong electric field, causing its atoms to split into free electrons and charged ions. This electrically conductive, highly reactive state is what makes up stars, lightning and the auroras. In laboratories and factories, engineers generate much cooler, controlled versions of plasma and put its unique properties to work across an unusually wide range of industries.
Electronics and semiconductor manufacturing: The most economically significant use of plasma today is in the electronics industry. Plasma is used to etch microscopic circuit patterns onto silicon wafers with nanometre-scale precision, and to deposit the ultra-thin metallic and insulating films that make up modern microchips. Techniques such as magnetron sputtering and ionised physical vapour deposition rely on plasma to control exactly how atoms are stripped from a source material and guided onto a surface, a level of precision that conventional heating or chemical methods simply cannot match.
Medicine and sterilisation: Cold atmospheric plasma, which operates near room temperature, is increasingly used in healthcare. It can sterilise surgical instruments and packaging without the heat or chemical residues associated with traditional methods, and ongoing research is exploring its use in wound healing, disinfecting skin, and even selectively targeting cancer cells while sparing healthy tissue.
Energy and environmental applications: Plasma plays a central role in the pursuit of nuclear fusion, where hydrogen isotopes are heated into a plasma state hot enough to fuse and release energy, mimicking the process that powers the sun. On a smaller scale, plasma is also used to treat industrial exhaust gases, breaking down pollutants before they are released into the atmosphere, and to improve the efficiency of solar cells through precision surface treatments.
Aerospace and propulsion: Plasma thrusters, which accelerate ionised gas using electric or magnetic fields rather than chemical combustion, are now standard equipment on many satellites. They deliver far less thrust than a conventional rocket engine, but sustain it efficiently over long periods, making them well suited to keeping satellites in position or propelling deep-space probes on long journeys using a fraction of the propellant a chemical engine would need.
Everyday materials and coatings: Plasma treatment is used to modify the surface properties of plastics, textiles and metals, making them more receptive to printing, adhesives or paint, more resistant to wear and corrosion, or water-repellent. Many of the durable coatings on tools, packaging films and even sportswear owe their performance to a brief pass through a plasma chamber during manufacturing.
Why this matters: What ties these applications together is the same underlying advantage: plasma offers a level of control over atoms, ions and surfaces that few other tools can match – whether the goal is building a computer chip a few atoms thick, sterilising a scalpel, or propelling a satellite. As industries continue to demand smaller, cleaner and more efficient technologies, plasma-based techniques are likely to become only more central to how things are made.
Bahrain’s own contribution to plasma research: This is not purely an overseas story. The University of Bahrain has its own footprint in the field: a study recently published in the peer-reviewed journal Plasma presented a radio-frequency air plasma system, operating at just a few millibars of pressure and requiring no special gases, that was tested for its ability to inactivate Escherichia coli bacteria on surfaces.
The work, carried out at the university’s Department of Physics in collaboration with the Department of Biology and Salmaniya Medical Complex, showed that bacteria placed directly within the plasma discharge were rapidly and effectively inactivated, in some cases within seconds, while samples placed just centimetres away, outside the active plasma region, were barely affected at all. The findings highlight both the strong sterilising power of plasma and how precisely it can be targeted, pointing to future uses in low-cost, chemical-free decontamination of surfaces and medical equipment – a reminder that this cutting-edge science has a home base right here in the kingdom.
Dr Mahmood Nasser
Department of Physics
University of Bahrain
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