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A kind of water-soluble carbon quantum dot sustained-release microcapsules and its preparation method and application

A technology of slow-release microcapsules and carbon quantum dots, applied in microcapsule preparations, microsphere preparation and other directions, can solve the problems of reduced use efficiency, concentration quenching, loss of efficiency, etc., and achieve controllable release, high controllable release, Small particle size effect

Active Publication Date: 2020-08-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the water solubility of carbon quantum dots, spraying them directly on the leaf surface is easy to be lost under the scouring of natural rain outside, and at the same time, it is easily affected by external dust and loses performance.
On the other hand, the large accumulation of carbon quantum dots is prone to concentration quenching, which greatly reduces its use efficiency.

Method used

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  • A kind of water-soluble carbon quantum dot sustained-release microcapsules and its preparation method and application
  • A kind of water-soluble carbon quantum dot sustained-release microcapsules and its preparation method and application
  • A kind of water-soluble carbon quantum dot sustained-release microcapsules and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0048] A preparation method of water-soluble carbon quantum dot sustained-release capsules, comprising the following steps:

[0049] (1) 4mL 0.5mg / mL carbon quantum dot solution, 1mL glutaraldehyde, 1mL3.65wt% dilute hydrochloric acid solution and 0.1mLTween-80 are prepared into the inner water phase; the inner water phase is added dropwise to the oil phase (0.5 mL of Span80 and 10 mL of cyclohexane), emulsified for 20 minutes to form a stable W / O primary emulsion; the formation of the internal water phase and the formation of the primary emulsion were carried out in a water bath at 40 ° C and a stirring rate of 1500 rpm;

[0050] (2) In a water bath at 40°C and a stirring rate of 250rpm, add the primary emulsion into the external water phase (composed of 0.3mL of Tween-80 and 20mL of PVA-1799 aqueous solution, the concentration of the PVA-1799 aqueous solution is 1.5gPVA / 100mL aqueous solution) , forming W / O / W double emulsion; after the addition, continue the cross-linking re...

Embodiment 2

[0053] A preparation method of water-soluble carbon quantum dot sustained-release capsules, comprising the following steps:

[0054] (1) Prepare 4mL 0.3mg / mL carbon quantum dot solution, 0.8mL glutaraldehyde, 1mL3.65wt% dilute hydrochloric acid solution and 0.2mL Tween-80 into the inner water phase; add the inner water phase to the oil phase drop by drop (0.5 mL of Span80 and 10 mL of cyclohexane), emulsified for 20 minutes to form a stable W / O primary emulsion; the formation of the internal water phase and the formation of the primary emulsion were carried out in a water bath at 40 ° C and a stirring rate of 1500 rpm;

[0055] (2) In a water bath at 40°C and a stirring rate of 250rpm, add the primary emulsion into the external water phase (composed of 20mL of PVA-1799 aqueous solution, the concentration of the PVA-1799 aqueous solution is 1.0gPVA / 100mL aqueous solution) to form a W / O / W Double emulsion; after the addition, continue the cross-linking reaction for 3 hours, centr...

Embodiment 3

[0057] A preparation method of water-soluble carbon quantum dot sustained-release capsules, comprising the following steps:

[0058] (1) 4mL 1mg / mL carbon quantum dot solution, 1.2mL glutaraldehyde, 1mL 2wt% dilute hydrochloric acid solution and 0.3g SDBS were prepared into the inner water phase; the inner water phase was added dropwise to the oil phase (0.5mL of Span80 and 10 mL of n-heptane), emulsified for 20 minutes to form a stable W / O primary emulsion; the formation of the internal water phase and the formation of the primary emulsion were carried out in a water bath at 30 ° C and a stirring rate of 1200 rpm;

[0059] (2) In a water bath at 30°C and a stirring rate of 500rpm, add the primary emulsion to the external water phase (composed of 0.3mL of Tween-80 and 20mL of PVA-1788 aqueous solution, the concentration of the PVA-1788 aqueous solution is 0.8gPVA / 100mL aqueous solution) , forming W / O / W double emulsion; after the addition, continue the cross-linking reaction fo...

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Abstract

The invention belongs to the technical field of polymer material synthesis, discloses a water-soluble carbon quantum dot sustained-release microcapsule and a preparation method and application thereof. The water-soluble carbon quantum dot sustained-release microcapsule is composed of a capsule core containing water-soluble carbon quantum dots and a capsule wall. The method is as follows: (1) underthe condition of mixing, a water phase comprising the carbon quantum dots, a crosslinker, a catalyst, a water soluble emulsifier and water is added to an oil phase comprising an oil soluble emulsifier and an organic solvent dropwise for emulsifying to form initial emulsion; and (2) under low-speed stirring, the initial emulsion is added to an outer water phase comprising wall material PVA, a stabilizer and water to form W / O / W multiple emulsion; and the water-soluble carbon quantum dot sustained-release microcapsule is obtained by continued crosslinking reaction, centrifuging, washing anddrying after the completion of the adding. The microcapsule has high fluorescence intensity, high core coating rate, low carbon quantum dot loss, controllable release and high light absorption efficiency, and is used in plant photosynthesis and other fields.

Description

technical field [0001] The invention belongs to the field of polymer material synthesis, and in particular relates to a water-soluble carbon quantum dot slow-release microcapsule and its preparation method and application. Background technique [0002] Solar energy is an abundant natural resource and sustainable energy, and has become an important part of human energy use. In the case of decreasing fossil fuels, it is becoming more and more important to strengthen the conversion and storage of solar energy and improve its utilization efficiency. Green plants are the main converters of solar energy, which convert solar energy into chemical energy through photosynthesis of chlorophyll. However, chlorophyll mainly absorbs blue-violet light and red light. In order to improve the photosynthetic efficiency of chloroplasts, it is a good method to convert ultraviolet light into visible light for chloroplasts to absorb. [0003] Carbon quantum dots have excellent properties such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02
CPCB01J13/025
Inventor 方玉堂毛小萍刘应亮梁向晖汪双凤高学农张正国
Owner SOUTH CHINA UNIV OF TECH
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