Accession Number:

AD0423767

Title:

EYE MELANIN FREE RADICAL KINETICS AND MECHANISM IN RELATION TO THE ROGINSKY-ZELDOVICH (OR ELOVICH) EQUATION AND THE ADSORPTION OF OXYGEN BY SEMICONDUCTORS,

Descriptive Note:

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AVIATION MEDICAL ACCELERATION LAB

Personal Author(s):

• Cope,Freeman W.

Report Date:

1963-09-30

Pagination or Media Count:

17.0

Abstract:

Eye melanin free radical decay was previously shown to conform to an equation derived from a postulate that the rate-limiting step was eletron conduction across the liquid-solid interface at the surface of the melanin particle. It is shown here that this equation closely approxi mates the Roginsky-Zeldovich or Elovich equation for oxygen adsorption on inorganic semiconductor solids, which provides two convenient graphical criteria for this type of kinetics. Because the behavior of charge carriers is essentially similar in liquids and solids, it is believed that this derivation of the RoginskyZeldovich or Elovich equation is also applicable to phenomena at solid-solid interfaces in inorganic semiconductors. The similarity between the kinetics of melanin free radicals and semiconductor oxygen adsorption, together with previous experimental data indicating a dependence of melanin radical concentration on oxygen concentration, suggests that the eye melanin free radical process may involve oxygen adsorption with electron transfer across the surface of the melanin particle. Author

Descriptors:

• (*EYE PIGMENTS
• FREE RADICALS)
• (*OXYGEN
• ADSORPTION)
• SEMICONDUCTORS
• SOLIDS
• LIQUIDS
• KINETIC THEORY

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE