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Significance Silica particles with a population of nearly free silanols damage cellular membranes and initiate inflammatory reactions. Nearly free silanols are found on the surface of both fractured quartz and amorphous silica particles, and their occurrence initiates the toxicity of silica, thus revisiting the ancient paradigm whereby crystallinity is critical for silica toxicity. This finding resolves the lingering questions about the origin and the variability of the toxicity of silica particles. The discovery of the biological activity of nearly free silanols opens perspectives for the prevention of silicosis through a safer-by-design approach, and will have an impact on other fields that involve interfacial phenomena, including biomaterial design, nanofabrication, and catalysis.

Nearly free surface silanols are the critical molecular moieties that initiate the toxicity of silica particles