Plasma-Based Dielectric Barrier Discharge Systems for Air and Aerosol Decontamination and Activation

Background

Airborne pathogens and pollutants present a significant challenge to public health, especially in densely populated indoor environments such as hospitals, offices, and residential buildings. The field of air purification and decontamination has grown rapidly in response to concerns over infectious disease transmission, allergen exposure, and environmental contaminants. Traditional methods, such as mechanical filtration, ultraviolet (UV) irradiation, and chemical disinfectants, are commonly employed to reduce airborne risks. However, the emergence of highly transmissible respiratory viruses, antibiotic-resistant bacteria, and persistent organic pollutants has underscored the need for more effective, continuous, and adaptable air and aerosol decontamination technologies. The demand is particularly acute in healthcare settings, where vulnerable populations are at heightened risk, and in public spaces where large numbers of people congregate.

Despite the widespread use of existing air purification systems, several limitations hinder their effectiveness. Mechanical filters, such as HEPA filters, physically trap particulates but do not neutralize viruses or bacteria, and their efficacy diminishes as filters become saturated. UV-based systems require precise exposure times and line-of-sight access, making them less effective for moving aerosols or in shadowed areas. Chemical disinfectants can leave harmful residues, require manual application, and may not reach all contaminated surfaces or air volumes. Furthermore, many current approaches are energy-intensive, generate heat, or require frequent maintenance, limiting their scalability and integration into existing infrastructure. These shortcomings highlight the need for a low-power, non-thermal, and continuously operating solution capable of safely and efficiently decontaminating air and aerosols in a variety of settings.

Technology

This technology leverages cold plasma generated by dielectric barrier discharge (DBD) elements to decontaminate gases and aerosols efficiently. The core device consists of a housing with an opening for airflow, where a DBD element—configured as a conductive plate and grounded mesh separated by a thin dielectric, a mesh of conductive wires with dielectric coatings, or high aspect ratio fiber electrodes—produces plasma as air or aerosol passes through. This plasma generates reactive oxygen and nitrogen species (RONS), such as hydrogen peroxide, which actively disinfect the passing medium. The system is highly flexible and scalable, supporting integration with power supplies, filters, fans, and heating or cooling elements. It can be adapted for use in portable devices, medical nebulizers, or large-scale HVAC systems, providing continuous air or aerosol treatment for environments ranging from personal respiratory devices to entire buildings.

What differentiates this technology is its unique combination of safety, adaptability, and efficacy. Unlike traditional thermal or chemical disinfection methods, the cold plasma generated by DBD elements operates at low power and near-room temperature, ensuring that sensitive surfaces and tissues are not damaged during treatment. The modular design allows for various DBD configurations—such as flexDBD, plasma weave, and plasma velvet—enabling the device to fit curved surfaces, line air ducts, or be integrated into existing medical and environmental systems. Its ability to generate potent disinfectant species directly within the airflow, without the need for added chemicals or noble gases, results in high decontamination rates for pathogens like HSV and SARS-CoV-2. The technology’s scalability, low operational cost, and compatibility with recycling loops for enhanced exposure further distinguish it as a versatile solution for healthcare, agricultural, and environmental hygiene applications.

Benefits

• Effective decontamination of gases and aerosols by generating reactive oxygen and nitrogen species (RONS), including hydrogen peroxide, to reduce bacteria and viruses such as HSV and SARS-CoV-2.
• Non-thermal, safe operation at near-room temperatures, preventing damage to sensitive surfaces and tissues.
• Flexible and scalable device designs (e.g., flexDBD, plasma weave, plasma velvet) adaptable to various shapes, sizes, and integration into existing systems like nebulizers and HVAC.
• Low power consumption with options for battery-powered portable units or fixed installations for continuous air treatment.
• Versatile applications including medical nebulizers for respiratory disinfection, oncological therapies, agricultural seed treatment, and large-scale air purification in residential and commercial environments.
• Ability to generate plasma-activated mist (PAMI) for enhanced delivery of disinfectant species to complex surfaces and biological tissues.
• Integration capability with filters, fans, heating/cooling elements, and air recirculation systems to optimize treatment efficacy and environmental control.
• Compact, cost-effective, and modular design enabling easy deployment and customization across diverse settings.

Applications

• Medical nebulizer disinfection
• HVAC air purification
• Plasma-activated mist oncological therapy
• Agricultural seed treatment
• Surface decontamination in healthcare

Additional info

A plasma generation system employs dielectric barrier discharge (DBD) elements to produce cold plasma, decontaminating gases or aerosols. Configurable DBD elements (e.g., conductive plate/mesh, coated wires, high aspect ratio fibers) generate reactive oxygen and nitrogen species (RONS). This low-power, non-thermal, flexible, and scalable technology integrates into air treatment units, including nebulizers and HVAC systems, for continuous medium activation.