Light-induced quantum friction of carbon nanotubes in water

Carbon nanotubes exhibit light-induced quantum friction in water, a phenomenon where exciton interactions impede nanoscale motion. This discovery, published in Nature on June 10, 2026, allows for optical control over diffusion and fluid dynamics at the nanoscale. The research specifically observed this effect in near-infrared fluorescent carbon nanotubes. Quantum friction arises from the interaction between the nanotube's electronic excitations, known as excitons, and the surrounding water molecules. When illuminated, these excitons become excited and interact with the water's molecular structure, creating a drag force that is significantly amplified by quantum mechanical effects. This light-induced friction can be modulated by adjusting the intensity and wavelength of the incident light, offering a novel method for manipulating the movement of nanoparticles in liquid environments. The findings suggest potential applications in areas such as targeted drug delivery, microfluidic devices, and advanced materials science, where precise control over nanoscale particle behavior is crucial. The study provides a fundamental understanding of quantum effects at the interface of nanomaterials and liquids, opening new avenues for research in quantum mechanics and nanotechnology.