Liquid crystal cholesteric material and sensitizing agent composition and method for detecting electromagnetic radiation

Claim 2

The composition of claim 2 wherein said dye is selected from the group consisting of brilliant green, methyl orange, black azo dyes, Heliogen Blue BK powder, Heliogen Green GA powder, gasoline dyes, aminoazobenzene derivatives, beta-naphthol derivatives, triphenylmethane dyes, diphenylmethane dyes, acridine dyes, and indigo dyes.

Claim 3

A composition of Matter as defined in claim 1, characterized in that said agent is a material responsive to radiation in the frequency range of 1014 to 1015 cycles per second and comprises a phototropic material selected from the group consisting of the anils, hydrazones, osazones, semicarbazones, stilbene derivatives, and fulgides.

Claim 4

A composition of matter as defined in claim 1, characterized in that said agent is responsive to electromagnetic radiation in the frequency range of 1015 to 1017 cycles per second and is selected from the group consisting of beta-carotene, cholesteryl p-phenylazophenyl carbonate, and azobenzene compounds capable of undergoing rapid cis-trans isomerization in response to electromagnetic radiation.

Claim 5

A composition of matter as defined in claim 1, characterized in that said cholesteric-phase liquid-crystal material consists essentially of a mixture comprising 60 weight-percent of oleyl cholesteryl carbonate, and 40 weight-percent of cholesteryl nonanoate.

Claim 6

A composition as defined in claim 6, characterized in that said agent is responsive to electromagnetic radiation in the frequency range of 1012 to 1014 cycles per second and comprises a dye selected from the group consisting of brilliant green, methyl orange, National azo oil black, Heliogen Blue BK powder, Heliogen Green GA powder, green gasoline dye, blue gasoline dye, yellow gasoline dye, aminoazobenzene derivatives, beta-naphthol derivatives, triphenylmethane dyes, diphenylmethane dyes, acridine dyes, and indigo dyes.

Claim 7

A composition as defined in claim 6, characterized in that said agent is a material responsive to radiation in the frequency range of 1014 to 1015 cycles per second and comprises a phototropic material selected from the group consisting of the anils, hydrazones, osazones, semicarbazones, stilbene derivatives, and fulgides.

Claim 8

A composition as defined in claim 6, characterized in that said agent is responsive to electromagnetic radiation in the frequency range of 1015 to 1017 cycles per second and is selected from the group consisting of beta-carotene, cholesteryl p-phenylazophenyl carbonate, and azobenzene compounds capable of undergoing rapid cis-trans isomerization in response to electromagnetic radiation. 10. A method of detecting electromagnetic radiation in the frequency range of 1012 to 1017 cycles per second, said method comprising preparing a composition as defined in claim 1 in the form of a stratum having a thickness of about 0.25 to 50 microns, exposing said film, and examining said film to detect a color change therein indicative of its having been exposed to said radiation.

Claim 9

A method as defined in claim 10, characterized in that said method serves to detect electromagnetic radiation in the frequency range of 1012 to 1014 cycles per second and in that said composition being further characterized in that said agent is responsive to electromagnetic radiation in the frequency range of 1012 to 1014 cycles per second and comprises a dye selected from the group consisting of brilliant green, methyl orange, National azo oil black, Heliogen Blue BK powder, Heliogen Green GA powder, green gasoline dye, blue gasoline dye, yellow gasoline dye, aminoazobenzene derivatives, beta-naphthol derivatives, triphenyl methane dyes, diphenylmethane dyes, acridine dyes, and indigo dyes.

Claim 10

A method as defined in claim 10, further characterized in that said method serves to detect electromagnetic radiation in the frequency range of 1014 to 1015 cycles per second, said composition being further characterized in that said agent is a material responsive to radiation in the frequency range of 1014 to 1015 cycles per second and comprises a phototropic material selected from the group consisting of the anils, hydrazones, osazones, semiCarbazones, stilbene derivatives, and fulgides.

Claim 11

A method as defined in claim 10, said method serving to detect electromagnetic radiation in the frequency range of 1015 to 1017 cycles per second, said composition being further characterized in that said agent is responsive to electromagnetic radiation in the frequency range of 1015 to 1017 cycles per second and is selected from the group consisting of beta-carotene, cholesteryl p-phenylazophenyl carbonate, and azobenzene compounds capable of undergoing rapid cis-trans isomerization in response to electromagnetic radiation.

Claim 12

A homogeneous composition of matter capable of exhibiting a visual change in response to exposure to electromagnetic radiation comprising, in combination, a cholesterogenic material having liquid-crystal properties and a substance exhibiting phototropic behavior.

Claim 13

The composition of claim 14 wherein the phototropic substance is an azobenzene compound capable of undergoing rapid cis-trans isomerization in response to electromagnetic radiation.

Claim 14

A homogeneous composition of matter capable of exhibiting a visual change in response to exposure to electromagnetic radiation comprising, in combination, a cholesterogenic material having liquid-crystal properties and an oil-soluble dye capable of absorbing radiation.