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Chemical sensitiveness enhancing method for nano silver halide granular emulsion

A chemical sensitization and silver halide technology, applied in the field of photosensitive materials, can solve the problems of limited sensitization efficiency, unsuitable ripening temperature, and easy to cause ash

Inactive Publication Date: 2006-04-12
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Sensitizer type Types of Sensitization Methods Sensitization effect references pinacols (Pinaflavol) as a halogen acceptor Sensitization efficiency is not high Hospital wastewater advanced treatment system
(1), (2) Hydroquinones as an antioxidant or Halogen acceptor Sensitization efficiency is not high, and prone to ash fog
(1) Thiogagold conventional chemical sensitization Ripe temperature is not suitable High (<40℃), time It should not be long, so increase Sensitive efficiency is limited

Method used

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  • Chemical sensitiveness enhancing method for nano silver halide granular emulsion
  • Chemical sensitiveness enhancing method for nano silver halide granular emulsion
  • Chemical sensitiveness enhancing method for nano silver halide granular emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1 (by weight percentage)

[0015] 1) Preparation of nanometer silver bromine iodide particle emulsion: in the feedback type double-injection instrument controlled by microcomputer, add 4000ml water, gelatin (gelatin content is 5.5%) and polyvinylpyrrolidone (content is 0.75%), potassium iodide ( Content is 1% of total silver amount) and 0.08% citric acid, inject concentration to be respectively 800ml of silver nitrate and potassium bromide solution of 0.58mol / L and 0.54mol / L simultaneously in the reactor under the condition of 40 ℃, inject The time is 2 to 5 minutes. After the reaction, it is cooled rapidly and frozen below -10°C. The average diameter of the obtained emulsion particles was 14 nm. The particle size distribution is as figure 1 shown.

[0016] Then cut the frozen emulsion into strips, wash with water to desalt, and then remove water, and finally remelt the emulsion by heating, and adjust the pAg value to 9.0 before freezing. A nanometer silv...

Embodiment 2

[0018] Embodiment 2 (by weight percentage)

[0019] 1) Preparation of nanometer silver bromine iodide particle emulsion: in the feedback type double-injection instrument controlled by microcomputer, add 4000ml water, gelatin (gelatin content is 5.5%) and polyvinylpyrrolidone (content is 0.75%) and potassium iodide ( content is 1% of the total silver content), inject 800ml of silver nitrate and potassium bromide solutions with concentrations of 0.58mol / L and 0.54mol / L into the reactor at the same time at 40°C, and the injection time is 2 to 5 Minutes, cooled rapidly after the reaction, and frozen below -10°C, then cut into strips, washed with water to remove salt, and then removed water, and finally remelted the emulsion by heating, and adjusted the pAg value to 9.5 before freezing. A nanometer silver bromide iodide grain emulsion is obtained.

[0020] 2) Chemical maturation of the emulsion by dimethylamine borane: add dimethylamine borane chemical sensitizer at a constant tem...

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Abstract

The method adds methylamine borine compound as sensitizer into nanoemulsion of silver bromoiodide at constant temperature of 45-48 degree C in quantity of 1X10 to the power -5 - 1X10 to the power 7 mol / mol Ag for maturing of 40-60 minute and then fast freezing with low temperature. The sensitivity of matured silver halides emulsion nanoparticle is increased by five times than that of product obtained with conventional method.

Description

technical field [0001] The invention belongs to the technical field of photosensitive materials, and in particular relates to an efficient chemical sensitization method for nanometer size silver halide grain emulsion. Background technique [0002] Nano-silver halide grain emulsion refers to a photosensitive substance composed of silver halide crystallites with a particle size between 10 and 100nm and other chemical components. It is the core functional component for manufacturing high-resolution silver halide information recording materials. Only photosensitive materials made of silver halide grain emulsions with nanoparticle size can record information resolutions above thousands of lines per millimeter, which can be applied to holographic films (including general holography and synthetic holography), Microfilm, ultrafine dry plate (or film) and many other special fields. However, the intrinsic sensitivity of the extremely small nano-silver halide g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03C1/08G03C1/005
Inventor 赵文芳姚林辉郑彤夏培杰史瑶
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI