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Dielectric switching materials are prospective candidates for smart electronic/electrical applications, and high dielectric switching ratios are crucial for their practical applications. However, the substantial improvement of the dielectric switching ratio is limited by the available dielectric switching mechanisms, and obtaining high dielectric switching ratios is a major challenge. Here, an unparalleled dielectric switching effect is reported in a water‐in‐oil emulsion system, caused by dual polarization synergy below the dielectric transition temperature in concert with suppression of the electrode polarization above the dielectric transition temperature. The synergistic dielectric switching effect of interfacial polarization and electrode polarization endows the emulsion with unprecedentedly high dielectric switching ratios. The highest room temperature dielectric switching ratio of this emulsion system up to 2.86 × 106 at 20 Hz, is four orders of magnitude higher than the highest switching ratio reported so far. The unparalleled high dielectric switching ratio, reliable cycle stability, good frequency adaptability, and satisfactory scalability make the inorganic salt solution/octadecane emulsions potentially excellent candidates for high‐sensitivity room‐temperature smart switching or sensing devices. [ABSTRACT FROM AUTHOR]

Thermally-triggered electrical switching materials are of urgent demand for developing novel temperature sensors, overheat protection circuits, thermal controllers, battery management systems against overheating, etc. Here, we report a water-in-oil emulsion system with giant electrical switching ratios at room temperature prepared by a simple and efficient method. The temperature-sensitive phase transition process of alkanes as the oil phase causes the formation and collapse of conductive paths in the emulsion, resulting in electrical switching ratios of up to 6 orders of magnitude. The emulsions have good thermal cycle stability, and the switching ratio remains essentially unchanged after 100 cycles. The switching temperature can be easily adjusted by using alkanes of various chain lengths. In addition, the similar electrical switching effect is observed in four emulsions containing different neutral salts, ensuring the tunability and versatility of the system. The electrical switching emulsions offer a promising avenue to developing future high-performance, energy-saving, and low-cost electrical switching systems. [Display omitted] [ABSTRACT FROM AUTHOR]

Keywords: dielectric switching; emulsions; polarization; synergistic effect; temperature response EN dielectric switching emulsions polarization synergistic effect temperature response 1 1 1 07/14/23 20230711 NES 230711 B Dielectric Switching b In article number 2214544, Ming Jiang, Lijie Dong, and co-workers propose a synergistic dielectric switching mechanism. Dielectric switching, emulsions, polarization, synergistic effect, temperature response Unparalleled Dielectric-Switching Effects Caused by Dual Polarization Synergy (Adv. Funct. [Extracted from the article]