Accession Number : ADD016532

Title :   Control of Continuous Phase PH Using Visible Light to Activate PH-Dependent Fibers and Gels in a Controlled and Reversible Manner.

Descriptive Note : Patent, Filed 27 Aug 92, patented 2 Aug 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Zirino, Albert

Report Date : 02 Aug 1994

Pagination or Media Count : 11

Abstract : A transparent polyelectrolyte fiber or gel, such as crosslinked polyacrylic acid, which contracts and expands upon the addition of an acid or base to an aqueous medium solution, is placed in the same solution with a pH dependent dye, a colored photochromatic indicator dye. The dye preferably has a pAa value that is the same as the pH at a null contraction point of the fiber. By irradiating the solution with light of a wavelength of the absorption band of either the acid or base form of the dye, the solution pH is made to change, and the fiber is made to expand or contract, depending upon the wavelength. Thus, light energy is readily converted to work energy and may be used to power a pump, for example or an artificial muscle can be powered via an optical fiber.

Descriptors :   *FIBERS, *GELS, *PATENTS, *CONTROL, *CONTINUOUS PROCESSING, *PH FACTOR, *VISIBLE SPECTRA, ABSORPTION, CONTRACTION, DYES, ENERGY, INDICATORS, LIGHT, MUSCLES, POLYELECTROLYTES, POWER, PUMPS, PHASE, ACTIVATION, REVERSIBLE, CROSSLINKING(CHEMISTRY), EXPANSION, BASES(CHEMISTRY), SOLUTIONS(MIXTURES), OPTICS, PHOTOCHROMIC MATERIALS, POLYMERS

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE