Molecular Communication Across Time (MCAT) explores how information can be encoded in chemical traces that persist and “tell their story” hours or days after they are released. Instead of sending data through radio waves, a transmitter places tiny droplets or scent marks whose molecular mixtures evaporate and degrade at known rates. By sampling the remaining ratios later, a receiver can estimate when the mark was laid—opening the door to time-stamped chemical trails for robot-following, environmental monitoring, or wildlife studies.

Our project develops (1) a physics-based MCAT model covering evaporation, air transport, and sensing; (2) estimators that turn concentration readings into precise release-time predictions; and (3) an optimized “molecular alphabet” of substances with complementary lifetimes. A future lab demo will validate the concept. Join us in redefining how machines read the chemical memories of their surroundings!