POSITRON CHEMISTRY OF THE DEVELOPMENT MECHANISM

doi:10.7517/j.issn.1674-0475.2000.01.18

Imaging Science and Photochemistry ›› 2000, Vol. 18 ›› Issue (1): 18-24.DOI: 10.7517/j.issn.1674-0475.2000.01.18

POSITRON CHEMISTRY OF THE DEVELOPMENT MECHANISM

GONG Zhufang¹, ZHANG Yiheng^1,2,3, JIANG Zhiquan^1,2,3, XU Xuguo^1,2,3, YAN Tiantang^1,2,3, YU Shuqin², ZHUANG Siyong⁴, PENG Bixian⁵

1. Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026;
2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026;
3. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026;
4. Institute of Fine Chemical Industry, East China University of Science and Technology, Shanghai 200237, P. R. China;
5. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China

Received:1999-02-05 Revised:1999-06-02 Online:2000-02-20 Published:2000-02-20

Abstract

Abstract: The mechanism of action of free volume holes in photographic gelatin in developing processes was investigated by Positron Annihilation Technique(PAT) for the first time. In this work, a new mechanism has been proposed to account for the formation of silver thread in development. The application of PAT has introduced a new research technology and method into photographic science. The results showed that the average radius of free volume holes maintained constant on the whole in development. The free volume holes in gelatin may restrain the process of the silver ion to be reduced to silver atom in the space of the different electron cloud density, therefor the production and deposition of silver atom occurred in filamentary form. The free volume holes distributed over photographic gelatin macromolecule confusedly because of the complexity in structure and component. It is probably the confusion that leads to loose spatial structure of silver needle twisting into balls.

Key words: photographic gelatin, free volume hole, development process, positron annihilation technology

GONG Zhufang, ZHANG Yiheng, JIANG Zhiquan, XU Xuguo, YAN Tiantang, YU Shuqin, ZHUANG Siyong, PENG Bixian. POSITRON CHEMISTRY OF THE DEVELOPMENT MECHANISM[J]. Imaging Science and Photochemistry, 2000, 18(1): 18-24.

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POSITRON CHEMISTRY OF THE DEVELOPMENT MECHANISM

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