In a revolutionary breakthrough in the fight against viral transmission on everyday surfaces, researchers from RMIT University have developed a thin, flexible plastic film capable of physically destroying viruses on contact. This innovative material harnesses meticulously engineered nanotextured surfaces, known as nanopillars, which exert mechanical force to rupture viral particles, ushering in an era of antiviral surfaces that do not depend on chemical agents. This advancement can significantly reduce the risk of pathogen transfer through frequently touched objects, such as mobile phones and medical equipment, by deploying a scalable, cost-effective solution.
The antiviral mechanism underlying this novel plastic film operates through mechanical disruption rather than chemical inactivation. The acrylic surface is textured with ultra-fine nanopillars—three-dimensional nanostructures with precise spatial configuration—designed to latch onto a virus’s outer envelope. Upon contact, these nanopillars stretch and deform the viral membrane to the extent that it ruptures, leading to viral inactivation. This mechano-virucidal action represents a paradigm shift from traditional antiviral surfaces, which commonly use metals like copper or silicon-based nanospikes that kill viruses mainly through chemical and oxidative stress.
Central to the efficacy of this design is the spacing of the nanopillars. The RMIT team discovered that the proximity between these nanostructures is far more critical than their height for maximizing antiviral performance. When nanopillars are densely packed, with inter-pillar distances of roughly 60 nanometres, multiple nanopillars can latch simultaneously onto a single virus particle, effectively stretching its lipid envelope beyond its physical capacity and causing mechanical failure. Conversely, wider spacing exceeding 100 nanometres drastically diminishes the antiviral effect, and at around 200 nanometres, the virucidal activity is virtually nullified.
Testing was carried out using the human parainfluenza virus 3 (hPIV-3), an enveloped virus that causes respiratory diseases such as bronchiolitis and pneumonia. Laboratory assays demonstrated that exposure to the nanopatterned acrylic surface resulted in approximately 94% of virus particles being irreversibly damaged or physically destroyed within just one hour. This substantial reduction in viable virus presents a highly promising prospect for interrupting viral transmission chains, especially in clinical and high-traffic public environments.
Another compelling aspect of the RMIT research is its scalability and practicality. By leveraging flexible acrylic that can be manufactured in continuous rolls akin to plastic wrap, the antiviral films can be produced in large quantities using existing roll-to-roll fabrication technologies. This scalable manufacturing approach addresses a critical barrier in bringing nanostructured antiviral coatings to mass markets, distinguishing this technique from less practical rigid or metal-based surfaces that are difficult to integrate seamlessly with everyday products.
From a fabrication perspective, the research underscores the utility of precision nanofabrication tools to tailor the nanoarchitecture. Adjusting parameters such as pillar height and spacing allows optimization of virucidal effectiveness without sacrificing material flexibility or transparency. Such control paves the way for customization of antiviral films for diverse applications, including smartphone screens, keyboards, hospital surfaces, and public transit handrails, which demand clear, durable coating solutions compatible with user interaction.
The distinction between enveloped and non-enveloped viruses adds another layer of complexity. Enveloped viruses possess a fragile lipid membrane susceptible to mechanical stretching and rupture by nanopillars, whereas non-enveloped viruses have a proteinaceous capsid lacking such a membrane, rendering them more resistant to mechanical assault. The RMIT team plans subsequent investigations to explore the antiviral spectrum of their nanostructured surfaces against a broader range of viral types, including smaller and non-enveloped viruses, to evaluate the universal applicability of this mechano-virucidal approach.
Importantly, the study also comments on the performance of nanopillars with blunt tips versus sharp nanospikes. Contrary to prior beliefs that sharpness was paramount, it was shown that blunt nanopillars densely arranged can achieve similar or enhanced levels of viral inactivation. This insight “democratizes” the design requirements, potentially simplifying fabrication processes and reducing production costs while maintaining robust antiviral action.
The researchers acknowledge challenges that remain. One significant factor for future development is the adaptation of nanopillar spacing for curved or irregular surfaces where uniform nanopillar proximity might be difficult to maintain. Curvature can alter spacing at the nanoscale, potentially diminishing virucidal efficiency if not carefully engineered. Addressing this involves advanced nanomanufacturing techniques and flexible substrate engineering to maintain consistent nanoscale parameters on three-dimensional surfaces.
Beyond the immediate public health benefits, the development of mechanical virus-killing coatings presents an environmentally friendly alternative to chemical disinfectants, which often pose toxicity and sustainability concerns with frequent use. By eliminating or reducing the need for harsh chemicals, these nanopatterned films offer safer, long-lasting antiviral protection compatible with sensitive applications in healthcare, food handling, and consumer electronics.
The team behind this research expresses strong interest in collaborating with industry partners to optimize and commercialize these nanostructured acrylic surfaces on a large scale. Given the enormous global demand for effective infection control solutions, particularly in light of the COVID-19 pandemic, this innovation holds potential for rapid adoption and widespread public impact if integrated effectively into manufacturing pipelines.
In summary, RMIT’s mechanistically designed, antiviral acrylic surfaces mark a crucial advancement in preventing viral spread on commonly touched surfaces. By employing nanopillars as mechanical disruptors that stretch and rupture the delicate viral envelope, this technology combines scientific ingenuity with practical scalability. The work opens a promising avenue toward everyday materials that self-sterilize through engineered physical properties rather than relying solely on chemical disinfection, offering a compelling tool in the global effort to control infectious diseases.
Subject of Research: Cells
Article Title: Designing Scalable Mechano-Virucidal Nanostructured Acrylic Surfaces for Enhanced Viral Inactivation
News Publication Date: 13-Feb-2026
Web References: http://dx.doi.org/10.1002/advs.202521667
References: DOI: 10.1002/advs.202521667
Image Credits: RMIT University
Keywords: antiviral surfaces, nanopillars, mechano-virucidal, viral inactivation, flexible acrylic film, nanopatterned coating, human parainfluenza virus 3, nanofabrication, enveloped virus, scalable manufacturing, infection control, nanotechnology
