Nonlinear Self-Excited Oscillation of a Synthetic Ion-Channel-Inspired Membrane

摘要

Nonlinear phenomena are crucially important in future science and engineering. Some researchers have achieved nonlinear oscillations such as the Belousov-Zhabotinskii reaction,[1] chemical reactions on catalysts,[2] rhythmic swelling phenomena of hydrogels,[3] permeation phenomena of membranes,[4], [11] swinging motions of lipids,[5] fluorescence oscillation of quantum dots,[6] synthetic metabolators,[7] and rhythmic drug-delivery systems.[8] We have developed a synthetic ion-channel-inspired biomembrane, which we call a molecular recognition ion-gating membrane.[9] This membrane could control both hydrostatic pressure-driven flow[9b],[c] and osmotic pressure[9a] in response to Ba2+ ions. Herein, we report that our gating membrane generated nonlinear self-excited oscillation in response to Ba2+ ions (see Figure 1) by combining these two functions of the membrane.