Method for preparing near-infrared silver sulfide quantum dots by high-gravity reactor

A high-gravity reactor and silver sulfide technology, which is applied in the interdisciplinary fields of chemical industry, materials and photonics, can solve the problems of poor controllability of quantum dots, and achieve the effects of narrow particle size distribution, good near-infrared fluorescence performance, and high product purity

Active Publication Date: 2019-11-01
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silver sulfide quantum dots prepared in the past mostly use traditional stirred tank reactors, the nucleation an

Method used

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  • Method for preparing near-infrared silver sulfide quantum dots by high-gravity reactor
  • Method for preparing near-infrared silver sulfide quantum dots by high-gravity reactor
  • Method for preparing near-infrared silver sulfide quantum dots by high-gravity reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Measure 42.5ml of octadecene, 5ml of oleylamine, and 2.5ml of oleic acid into a 100ml beaker, add 0.168g of silver acetate, stir the solution at room temperature until it becomes clear, and record it as solution A. Measure 50ml of ultrapure water into a 100ml beaker, add 0.12g of sodium sulfide nonahydrate, 1ml of Tween 20, shake to dissolve, and record it as solution B. Adjust the rotation speed of the external circulation high gravity rotating packed bed to 1000rpm, pass the A and B solutions into the external circulation high gravity rotating packed bed through the peristaltic pump, set the feed flow rate of the A solution and the B solution to 1:1, The feeding rate of the peristaltic pump is 20rpm. After all the raw material solution is passed into the outer circulation supergravity rotating packed bed, the discharged solution is collected, washed 5 times by centrifugal washing with absolute ethanol, and the obtained product is placed in a drying box for 60 °C for 8...

Embodiment 2

[0027] Measure 42.5ml of octadecene, 5ml of oleylamine, and 2.5ml of oleic acid into a 100ml beaker, add 0.168g of silver acetate, stir the solution at room temperature until it becomes clear, and record it as solution A. Measure 50ml of ultrapure water into a 100ml beaker, add 0.12g of sodium sulfide nonahydrate, 1ml of Tween 20, shake to dissolve, and record it as solution B. Adjust the rotation speed of the external circulation high gravity rotating packed bed to 1000rpm, pass the A and B solutions into the external circulation high gravity rotating packed bed through the peristaltic pump, set the feed flow rate of the A solution and the B solution to 1:1, The feeding rate of the peristaltic pump is 70rpm. After all the raw material solution is passed into the outer circulation supergravity rotating packed bed, the discharged solution is collected, washed 5 times by centrifugal washing with absolute ethanol, and the obtained product is placed in a drying box for 60 °C for 8...

Embodiment 3

[0029] Measure 42.5ml of octadecene, 5ml of oleylamine, and 2.5ml of oleic acid into a 100ml beaker, add 0.168g of silver acetate, stir the solution at room temperature until it becomes clear, and record it as solution A. Measure 50ml of ultrapure water into a 100ml beaker, add 0.12g of sodium sulfide nonahydrate, 1ml of Tween 20, shake to dissolve, and record it as solution B. Adjust the rotation speed of the external circulation high gravity rotating packed bed to 1000rpm, pass the A and B solutions into the external circulation high gravity rotating packed bed through the peristaltic pump, set the feed flow rate of the A solution and the B solution to 1:1, The feeding rate of the peristaltic pump is 120rpm. After all the raw material solution is passed into the outer circulation supergravity rotating packed bed, the discharged solution is collected, washed 5 times by centrifugal washing with absolute ethanol, and the obtained product is placed in a drying box for 60 °C for ...

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Abstract

The invention discloses a method for preparing near-infrared silver sulfide quantum dots by a high-gravity reactor, belonging to the cross technical fields of chemical engineering, materials and photonics. Microscopic mixing and mass transfer process strengthening are achieved by using the high-gravity technology. In the method, silver acetate and sodium sulfide nonahydrate are adopted as reactionprecursors; oleic acid and oleylamine are used as stabilizers; a precursor solution is fed into the high-gravity reactor for nucleation and growth, and finally, centrifugal separation is performed with absolute alcohol to obtain oil-soluble silver sulfide quantum dots the fluorescence-emission peak of which is in the near-infrared range and the dimension of which is 2-10 nm. The method does not need high-temperature high-pressure reaction conditions or protective gas and can be performed at room temperature, and discharging can be achieved in seconds by utilizing a high-gravity rotating packed bed, thus greatly shortening the reaction time, ensuring product uniformity and good repeatability among products of different batches. The production process is simple and the method has unique advantages for large-scale industrial production.

Description

technical field [0001] The invention belongs to the interdisciplinary technical fields of chemical industry, material and photonics, and relates to a method for preparing near-infrared silver sulfide quantum dots through a supergravity reactor. Background technique [0002] Quantum dots are nano-scale semiconductors. By applying a certain electric field or light pressure to this nano-semiconductor material, they will emit light of a specific frequency, and the emission wavelength will change with changes in size and composition. Compared with organic fluorescent dyes, quantum dots have the advantages of narrow emission peak, broad absorption peak, high optical stability, and good biocompatibility. Currently used in biological diagnosis, display, lighting, electronic devices, etc. The fluorescence emission peak of near-infrared quantum dots is located in the second infrared region, which has a deeper penetration depth and a higher signal-to-noise ratio, and has unique advant...

Claims

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Application Information

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IPC IPC(8): C01G5/00C09K11/58B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01G5/00C01P2002/72C01P2002/80C01P2002/85C01P2004/04C01P2004/64C09K11/582
Inventor 蒲源刘晴王丹曾晓飞王洁欣
Owner BEIJING UNIV OF CHEM TECH
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