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Browse Prior Art Database

Displays from Polyelectrolytic Gels

IP.com Disclosure Number: IPCOM000085579D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR [+2]

Abstract

Polyelectrolytic gels are known to undergo reversible dilation and contraction by changing the state of the ionization of the polymeric network. This can be accomplished by changing the pH or the ionic concentration of the solution in which these gels are suspended. [1]

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Displays from Polyelectrolytic Gels

Polyelectrolytic gels are known to undergo reversible dilation and contraction by changing the state of the ionization of the polymeric network. This can be accomplished by changing the pH or the ionic concentration of the solution in which these gels are suspended. [1]

One such polyelectrolytic gel is poly glutamic acid (PGA) cross-linked by glycerol, which is reportedly undergoing chemomechanical changes as mentioned. [2] In confirming those observations as by preparing a PGA gel cross-linked with 1,6-hexanediamine, it was found that the resultant material had additional properties which are useful for fabrication of information displays:

At pH 7.6 the film seemed to be isotropic from the optical point of view. It did not change the polarization of a beam of light that passed through it. Thus, when viewed through cross polarizers, it appeared dark. As the pH was changed to 4 the material rearranged and assumed a structure that is known as "the helix structure". It returned to a phase that resembles a liquid crystalline phase (though the material was still a solid like gel), a state that the parent polymer poly glutamic acid (PGA) possessed before it was cross-linked. When viewed through cross polarizers, the material appeared bright, since, as any randomly oriented liquid crystal would do, it twisted the polarization of the passing light.

It was reported [3] that the pH of a solution can be changed by passing electric current...