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Cadmium sulfide nanometer particle sensitizing agent, preparation method and uses thereof

A technology of nano-particles and cadmium sulfide, which is applied in emulsified silver emulsions, etc., can solve the problems of reduced probability of latent image formation, dispersion, and difficulty in increasing the sensitivity, so as to reduce fog, increase sensitivity, and reduce latent image dispersion. Effect

Inactive Publication Date: 2004-06-16
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, since there are many active sites on the surface of the silver halide crystallite, the adsorption sites of the water-soluble sensitizer compound on the surface of the silver halide crystallite tend to be scattered, and the positions of the sensitized spots generated on the particle surface are also scattered, resulting in latent images. The probability of formation becomes smaller and dispersed, and it is difficult to increase the sensitivity

Method used

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  • Cadmium sulfide nanometer particle sensitizing agent, preparation method and uses thereof
  • Cadmium sulfide nanometer particle sensitizing agent, preparation method and uses thereof
  • Cadmium sulfide nanometer particle sensitizing agent, preparation method and uses thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Preparation of sensitizer: In a 2.5L glass container, add 0.7L of distilled water and 20g of gelatin, dissolve it under stirring at 50°C, then add 0.31g of Cd(NO 3 ) 2 4H 2 O to dissolve and stir well; add 0.24 g of Na to 0.3 L of distilled water 2 S·9H 2 O is made into a solution, and slowly added to the above-mentioned solution stirred in a constant temperature water bath at 50°C and stirred at a high speed, and then stirred for 5 minutes after adding, to prepare a cadmium sulfide nanoparticle sensitizer with a particle size of 1 to 30 nanometers .

[0043] Preparation of cubic silver bromide microcrystalline emulsion: In a 50-liter container equipped with a high-speed stirring device, add 10 liters of water, 0.2 kg of gelatin, and 0.0011 kg of potassium bromide in advance, heat to 60 ° C, stir at constant temperature, and control pAg at about 7.5 , within 300 minutes, 2 liters of 3.0 mol / liter silver nitrate aqueous solution and 2 liters of 3.0 mol / liter potassiu...

Embodiment 2

[0046] The cadmium sulfide nanoparticle sensitizer of Example 1 was used.

[0047] Sulfur-gold synergistic sensitization of cubic silver bromide microcrystalline emulsion: Accurately weigh two parts of 1 kg of cubic silver bromide emulsion, add them to two 1.5L containers respectively and let them melt; and accurately measure the above-mentioned preparation 20mL of cadmium sulfide nanoparticle sensitizer, added to one of the containers containing the emulsion, and then measured 1 × 10 -4 Add 10mL of moL / L gold trichloride hydrochloride solution into the emulsion; accurately measure 20mL of pre-configured 0.001mol / L sodium thiosulfate, add it to another container containing the emulsion, and then Measure 1×10 -4 Add 10 mL of moL / L gold trichloride hydrochloride solution to the emulsion. Carry out chemical sensitization in a constant temperature water bath at 65°C, and then coat the emulsion on the polyester film base at different time intervals, the amount of silver coated is...

Embodiment 3

[0049] The cadmium sulfide nanoparticle sensitizer of Example 1 was used.

[0050] Sensitize cubic silver bromide microcrystalline emulsion at different temperatures: Accurately weigh two parts of 1 kg of cubic silver bromide microcrystalline emulsion, add them to two 1.5L containers and place them in 65°C and 75°C containers respectively. Melt it in a constant temperature water bath; accurately measure two parts of the cadmium sulfide nano-particle sensitizer 20mL prepared above, add to two containers containing the emulsion respectively and carry out chemical sensitization for 80 minutes; then apply the emulsion on the On the polyester film base, the amount of silver coated is 0.012 kg / square meter, cooled, dried at room temperature, exposed with a special exposure instrument, developed, fixed, dried, and tested. The obtained results are shown in Table 3.

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Abstract

The invention relates to a cadmium sulfide nano particle sensibilizer, process for making and use thereof, wherein the process comprises, dispersing the water soluble cadmium compound solution and water soluble sulfur-containing compound into water soluble macromolecular compound, mixing under the temperature of 10-100 deg.C, stirring, thus obtaining the sensibilizer comprising cadmium sulfide nano particles, water-soluble inorganic substance and water-soluble macromolecular compound. The silver sulfide hypersensitizing speckle distribution formed by the sensibilizer according to the invention is easy to control, thus can reduce latent image dispersion, improve luminous sensitivity and contrast.

Description

technical field [0001] The invention belongs to the technical field of silver halide photosensitive materials, and in particular relates to a cadmium sulfide nano particle sensitizer, a preparation method and application thereof. Background technique [0002] The sensitization of silver halide microcrystalline emulsion mainly includes chemical sensitization and spectral sensitization. Chemical sensitization is mainly to increase the sensitivity of silver halide microcrystalline emulsion in its intrinsic spectral region, and spectral sensitization is mainly to increase the sensitivity by increasing the indirect absorption rate of silver halide microcrystalline in its extrinsic spectral region. [0003] Through chemical sensitization processes such as sulfur sensitization, gold sensitization, and sulfur-plus-gold sensitization, a certain size and a certain number of chemically sensitized spots can be formed on the surface of silver halide crystallites...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03C1/09
Inventor 李金培许春华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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