Normally, a solid is heated to a certain temperature and turns into a liquid state. When the liquid is cooled to a certain temperature, it becomes a solid. However, a solid material newly developed by Japanese scientists will become liquid under ultraviolet irradiation, and then it will be able to change back to solid after being irradiated with visible light without changing the ambient temperature.
This kind of photoreactive new material, which can be liquefied and cured by light irradiation at room temperature, was developed by scientists from the Department of Nanosystems Research of the Japan Industrial Technology Research Institute and is the first in the world.
According to a press release issued by the Japan Industrial Technology Research Institute, this powdered material is a liquid crystalline material in which a sugar alcohol is used as a skeleton and a plurality of azo groups are combined. Because azobenzene is a known substance that can change its shape under light irradiation, researchers use azo groups as photoreactive sites for new materials. The new material is irradiated with ultraviolet rays centered at a wavelength of 365 nanometers. The material gradually changes from yellow to orange and slowly liquefies, eventually becoming completely liquid. When irradiated with visible light with a center wavelength of 510 nm, the color of the liquid will return to yellow and solidify at the same time. This liquefaction and curing can be repeated.
According to the communique, new materials are expected to have a variety of uses, one of which is a light-reactive adhesive that can be repeatedly bonded and detached. The researchers sandwiched the liquefied new material between two glass plates. The glass was cured by visible light irradiation. After that, the tensile shear strength test showed that each square centimeter of adhesive surface was resistant to about 5 kilograms of tensile force. The ultraviolet ray was used to liquefy the adhesive and it was found that the tensile shear strength decreased to less than the original six-sixths.
The relevant research papers of this study have been published in the online version of the German scientific journal Advanced Materials.
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