The Japan Physical and Chemical Research Institute announced that Prof. Aizumi Aida and the colleagues of the University of Tokyo have recently developed semi-permanent drive film actuators that use energy fluctuations in the environment as their energy source.
To achieve sustainable social development, scientists are vigorously developing natural energy conversion and storage technologies that replace fossil energy such as sunlight, wind power, and geothermal energy. However, for mobile devices and wearable devices, it is extremely important to develop a lightweight and compact power source that does not require socket charging. In order to realize such a power source, it is necessary to develop an energy collection technology around the user.
The team’s report published in the “Nature-Materials†online edition stated that the thin-film actuator they developed could sense small changes in humidity and work semi-permanently. This film can be stretched according to the change in the amount of moisture absorbed, sensing changes in humidity. The film developed this time can make large and high-speed telescopic movements with a small change in humidity, and can sense minute changes in humidity that cannot be detected by general hygrometers, thereby efficiently converting local humidity changes into kinetic energy. This film can even convert environmental fluctuations such as light and heat that affect moisture absorption into energy.
Although there have been reports previously on the development of humidity-responsive materials, their flexion and extension reactions are slow, and they require very high humidity conditions and cannot be converted into kinetic energy under normal circumstances. The research team used a polymer film that did not absorb moisture, but the material part was designed with a water-absorbing structure. When the film is made, the polymer is properly aligned, and large-scale telescopic motion can be achieved by absorbing very little moisture. The research team gilded a part of the film and used the humidity fluctuations around the water droplet as a driving force to successfully develop a unidirectional motion actuator. The film can respond to changes in the environment at high speed and can flex, jump at high speed when exposed to strong light.
This achievement is of great significance to the design of energy collection technologies and energy conversion materials. Since the film motion can be efficiently converted into electrical energy, it has practical use value. (Reporter Chen Chao)
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