Method for preparing nanometer silver halide colloids

A silver halide and nanotechnology, which is applied in the field of preparation of nanometer silver halide colloids, can solve the problems of difficulty in product purification, increased cost, complicated methods, etc., and achieves the effects of uniform microscopic morphology and size, stable dispersion, and simple and controllable steps.

Active Publication Date: 2011-09-28
JIANGSU NADN SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the above-mentioned methods are relatively complicated, and all kinds of surfactants and dispersants need to be added, which undoubtedly increases the cost, and also brings difficulty to product purification, and more importantly, it is not conducive to environmental protection.

Method used

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  • Method for preparing nanometer silver halide colloids
  • Method for preparing nanometer silver halide colloids
  • Method for preparing nanometer silver halide colloids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 10 g of solid paraffin, put it into 200 mL of deionized water heated to 70° C., control the temperature, and stir to completely melt the paraffin. Weigh a certain amount of KI and AgNO 3 , were formulated with a concentration of 0.06mol·L -1 The aqueous solution, using the method of double drops, is added to the above-mentioned paraffin / water microemulsion at a speed of 15 drops / min, temperature control, stirring, so that the system is uniformly dispersed, and kept for 20 minutes after the end of the dropwise addition, then stop the temperature control Stir, let the resulting mixed microemulsion stand, and cool to room temperature naturally. As the temperature decreases, the microemulsion will be stratified, and the paraffin will condense into blocks on the water surface. Take out the wax block completely, and add polyethylene to the remaining microemulsion. Pyrrolidone dispersant, continue to stir for 30 minutes to obtain a light yellow AgI colloid, which does n...

Embodiment 2

[0032] Weigh 10 g of solid paraffin, put it into 250 mL of deionized water heated to 90° C., control the temperature, and stir to completely melt the paraffin. Weigh a certain amount of KCl and AgNO 3 , were formulated with a concentration of 0.03mol·L -1 The aqueous solution of the above-mentioned paraffin wax microemulsion is added into the above-mentioned paraffin microemulsion at a rate of 10 drops / minute by double-drop method, temperature controlled, stirred to make the system uniformly dispersed, and kept for 10 minutes after the dropwise addition, then stop the temperature control and stir, Gained microemulsion is left to stand, naturally cooled to room temperature, along with the reduction of temperature, microemulsion stratification occurs, and paraffin coagulates into a block on the water surface, the wax block is taken out completely with tweezers, and 2g carboxymethyl is added in the remaining microemulsion Sodium sulfonate dispersant, continue to stir for 30 minu...

Embodiment 3

[0036] Weigh 10 g of solid paraffin, put it into 220 mL of deionized water heated to 80° C., control the temperature, and stir to completely melt the paraffin. Weigh a certain amount of KBr and AgNO 3 , were formulated with a concentration of 0.05mol·L -1 The aqueous solution of the above-mentioned paraffin wax microemulsion is added into the above-mentioned paraffin microemulsion with a speed of 18 drops / min by the method of double drops, and the temperature is controlled and stirred to make the system uniformly dispersed. The obtained microemulsion was allowed to stand, and naturally cooled to room temperature. As the temperature decreased, the microemulsion layered, and the paraffin wax coagulated into a block on the water surface. The wax block was completely taken out, and 1g of alkylphenol was added to the remaining microemulsion. Polyoxyethylene ether dispersant, continue to stir for 30 minutes to obtain milky white AgBr colloid, which does not decompose when exposed t...

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Abstract

The invention discloses a method for preparing nanometer silver halide colloids. The method comprises the following steps: placing solid paraffin into de-ionized water with temperature of 70-100 DEG C for stirring to obtain paraffin / water microemulsion; adding metal halide salts with the molar concentration of 0.01-0.1 mol / L and AgNO3 aqueous solution to the paraffin / water microemulsion by using a double-dipping method, keeping the temperature and stirring to obtain uniformly dispersed mixed microemulsion; standing and naturally cooling to the room temperature, taking out a paraffin mass condensed on a water surface after oil-water separation occurs in the mixed microemulsion , adding a small amount of dispersing agent to the remaining microemulsion, and continuously stirring to obtain a silver halide colloid with stable dispersion. In the invention, the whole reaction process by using the solidification and melting of paraffin, is simple and easy to control, green and environmental friendly, and the paraffin can be recycled, thereby the invention is particularly suitable for industrial production. The microcosmic shape and appearance of nano particle in the prepared product has the characteristics of uniform size, excellent dispersing stability and non-decomposition when exposing to light.

Description

technical field [0001] The invention relates to a preparation method of nano-silver halide colloid, which belongs to the field of preparation of inorganic nano-materials. Background technique [0002] Silver halide nanomaterial is a very important photosensitizer, which has been used in the manufacture of photochromic glass and medical devices. As one of the preferred materials for infrared crystal fiber, it has great development prospects in infrared sensors, infrared image transmission, infrared laser energy transmission, etc.; as an optical information carrier, it has the function of recording and preserving optical information. Its unique Photosensitivity has made it occupy an important position in the field of imaging science. In the past two decades, the rapid development of nanoparticle chemistry and physics has had an inestimable impact on the advancement of imaging science and technology. The preparation and properties of nanometer superfine silver halide are very ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G5/02
Inventor 王作山郑敏杨泸
Owner JIANGSU NADN SCI TECH CO LTD
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