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Cobalt sulfide nano particle sensitizing agent and its preparation method and application

A nanoparticle, cobalt sulfide technology, applied in the direction of emulsified silver emulsion, can solve the problem of not being a chemical sensitizer and cannot be effectively adsorbed, and achieve the effect of reducing latent image dispersion, improving sensitivity, and reducing fog.

Inactive Publication Date: 2005-07-27
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

However, such water-dispersible particles are not easy to chemically react with the surface of silver halide crystallites, or cannot be effectively adsorbed on the surface of silver halide grains due to the influence of other substances in the emulsion, so they are not an effective chemical sensitizer

Method used

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  • Cobalt sulfide nano particle sensitizing agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Cubic silver bromide microcrystalline emulsion preparation:

[0037] In a container with a capacity of 3 liters, add 500 milliliters of water, 10 grams of gelatin, and 0.0236 grams of potassium bromide in advance, heat to 65 ° C, and stir at a high speed at a constant temperature within 50 minutes to control the pAg value at about 7.4; 200 milliliters of silver nitrate aqueous solution with a concentration of 3.0 mol / liter and 200 milliliters of an aqueous solution of potassium bromide with a concentration of 3.0 mol / liter were added into the container at a linear speed and reacted simultaneously. After the reaction finishes, cool down to 35°C, add 20 milliliters of 5wt% sodium polystyrene sulfonate aqueous solution for sedimentation, wash 3 to 4 times, add water after adding 65 grams of gelatin until the total weight of the emulsion is 1 kilogram, and the silver content of the emulsion is 0.065 kg silver / kg emulsion. Finally, at about 50°C, stir at a constant temperat...

Embodiment 2

[0042] Preparation of octahedral silver bromide microcrystalline emulsion:

[0043] In a container with a volume of 3 liters, add 500 milliliters of water, 10 grams of gelatin, and 0.2 grams of potassium bromide in advance, heat to 65 ° C, and stir at a high speed at a constant temperature within 50 minutes to control the pAg value at about 8.8; 200 milliliters of silver nitrate aqueous solution with a concentration of 3.0 mol / liter and 200 milliliters of an aqueous potassium bromide solution with a concentration of 3.0 mol / liter were simultaneously added to the container at a linearly variable speed for reaction. After the reaction finishes, cool down to 30°C, add 20 milliliters of 5wt% sodium polystyrene sulfonate aqueous solution to settle, wash 3 to 4 times, add 65 grams of gelatin, add water until the total weight of the emulsion is 1 kilogram, and the silver content of the emulsion is 0.065 kg silver / kg emulsion. Finally, at 50°C, stir at constant temperature for 30 min...

Embodiment 3

[0048] The preparation of T grain silver bromide microcrystalline emulsion is completed:

[0049] In a container with a volume of 3 liters, add 500 milliliters of distilled water, 10 grams of gelatin, and 0.2 grams of potassium bromide in advance, heat to 50 ° C, and stir at a high speed at a constant temperature for 50 minutes to control the pAg value at about 8.8; 200 milliliters of silver nitrate aqueous solution with a concentration of 3.0 mol / liter and 200 milliliters of an aqueous potassium bromide solution with a concentration of 3.0 mol / liter were simultaneously added to the container at a linearly variable speed for reaction. After the reaction finishes, cool down to 35°C, add 20 milliliters of 5wt% sodium polystyrene sulfonate aqueous solution to settle, wash 3 to 4 times, add 65 grams of gelatin, add water until the total weight of the emulsion is 1 kilogram, and the silver content of the emulsion is 0.064 kg silver / kg emulsion. Then, at about 50°C, stir at constan...

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Abstract

The present invention belongs to the field of silver halide photosensitive material technology, in particular, it relates to a cobalt sulfide nano particle sensitizing agent, its preparation method and application. The hydrophilic high molecular compound solution, water soluble cobalt salt solution and water soluble sulfur-contained compound solution are mixed and stirred at 10-100 deg.C 80 as to obtain the invented cobalt sulfide nano particle sensitizing agent. The weight percentage concentration of the hydrophilic high molecular compound is 0.1-10%. Saiod sensitizing agent can be extensively used in silver halide microcrystal emulsion with various crystal forms.

Description

technical field [0001] The invention belongs to the technical field of silver halide photosensitive materials, and in particular relates to a cobalt sulfide nano-particle sensitizer and a preparation method and application thereof. Background technique [0002] Silver halide microcrystalline emulsion needs to go through a series of sensitization treatments in order to achieve ideal sensitivity. The sensitization of emulsion mainly includes chemical sensitization and spectral sensitization. Chemical sensitization can increase the sensitivity of silver halide microcrystals in their intrinsic spectral absorption region, and spectral sensitization can increase the sensitivity of silver halide microcrystals in their extrinsic spectral absorption region. [0003] Some sulfur-containing compounds are usually used as chemical sensitizers. This chemical sensitization process mainly forms chemically sensitized spots with a certain size on the surface of silver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03C1/08
Inventor 唐旻骜李金培王素娥
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI