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Design of Novel Reducing Agents for Direct Thermographic Materials

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We describe the systematic design and evaluation of new phenolic reducing agents (developers) for dry-processed, silver-based direct thermographic (TG) black-and-white films for medical diagnostic imaging. In TG media, heat exposure as short as 7 ms/pixel is used to induce development, thus highly active developers are needed. Our approach to this problem combined synthesis, coating evaluation, and electronic structure calculations to provide insights into the TG development mechanism. The computed highest occupied molecular orbital (HOMO) energy of the neutral developer did not correlate with maximum image density Dmax. Rather, the best developers (high Dmax, low fog) had relatively low phenol O-H deprotonation energies and high-lying phenolate anion HOMO energies, implying that, in the TG process, silver is reduced primarily by phenolate ion. This information allowed discovery of new categories of potentially useful TG developers, including ortho-aminophenol, para-aminophenol, halophenol, and resorcinol derivatives.

Document Type: Research Article


Affiliations: 1: University of Rochester Medical Center, Rochester, New York 14642 2: Eastman Kodak Company, 1999 Lake Avenue, Rochester, New York 14650-2112 3: Eastman Kodak Company, 1 Imation Way, Oakdale, Minnesota 55128 4: Mendota Heights, Minnesota 55120

Publication date: May 1, 2007

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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