Ultrastable, Magnet-Insensitive Perfluoropolyether-Based Oleogel for Reliable Sensing in Magnetic Resonance Imaging

In a strong magnetic field environment like Magnetic Resonance Imaging (MRI), traditional electronic conductors may interfere with imaging, whereas ionic conductors exhibit superior interference resistance, because the ion migration is minimally affected by the Lorentz force. Here, we developed a perfluoropolyether-based oleogel (PFOG) with ionic conductivity. As the major component in the network, perfluoropolyether endows PFOG with excellent biological, physical, and chemical stability, ensuring its compatibility in diverse environments. Additionally, the PFOG-based sensor is capable of effectively monitoring human physiological signals during long-term continuous MRI scans in a strong magnetic field (1.5 T) without compromising imaging quality. This strategy paves the way for the development of advanced sensor technology for the environment of a strong magnetic field.