Sunlight-energy-storing method

Details Sunlight-energy-storing method Sunlight-energy-storing method

1983-01-25

1984-05-22

Andrews, R. L.

Stoves and furnaces

Tool having fluid fuel burner

Curling iron

204158R, 126900, 126400, 432 1, F24J 302

Patent

active

044495161

ABSTRACT:
This invention is a method for storing light energy using an indigo derivative. Among indigo derivatives capable of storing light energy by the photoisomerization of the molecule from the trans-form to the cis-form, compounds heretofore obtained have been soluble only in expensive solvents such as benzene, toluene, chloroform, carbon tetrachloride and the like and harmful substances.
On the other hand, the indigo derivative of this invention has the form of a pyridinium salt, is soluble in water and/or ethanol, and permits employment of safe and inexpensive water and/or an alcohol as a solvent.
The indigo derivative of this invention converted from the trans-form to the cis-form by irradiation with sunlight and storing sunlight energy liberates the aforesaid stored energy as heat on addition of a catalyst and/or a heat trigger.

REFERENCES:
patent: 3994675 (1976-11-01), Sasse et al.
patent: 4123219 (1978-10-01), Sasse et al.
Chemical Abstracts, vol. 96, 1982, No. 60783.

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