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Thermo-sensitive fluorescent carbon nano composite material and preparation method thereof

A composite material, carbon nanotechnology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of limited application, environmental and human health threats, semiconductor quantum dots containing toxic metal ions, etc., to achieve a wide range of applications, coating Good sex, non-toxic effect in the synthesis process

Inactive Publication Date: 2013-07-17
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluorescent quantum dots currently mainly used have some shortcomings that cannot be ignored. For example, semiconductor quantum dots (CdSe, CdTe, CdS, etc.) generally contain toxic metal ions, which pose a potential threat to the environment and human health and limit their applications in biomedicine and Applications in food safety and other fields

Method used

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  • Thermo-sensitive fluorescent carbon nano composite material and preparation method thereof
  • Thermo-sensitive fluorescent carbon nano composite material and preparation method thereof
  • Thermo-sensitive fluorescent carbon nano composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1. Preparation of carbon quantum dot solution:

[0028] Take 1g of egg white and raise the temperature to 250°C at a rate of 10°C / min under a nitrogen atmosphere, keep it warm for 2 hours, and cool it down to room temperature naturally to obtain a black powder. Dissolve 0.1 g of the black powder in 10 g of deionized water, stir magnetically for 30 min, and then centrifuge at 10,000 rpm for 20 min. Take the centrifuged supernatant and filter it three times with a 200 nm ultrafiltration membrane. The carbon quantum dot solution with a concentration of 1 wt % is set aside.

[0029] 2. Preparation of poly N-isopropylacrylamide (PNIPAM) solution:

[0030] Dissolve 1.5g of PNIPAM monomer and 0.0225g of MBA in 150ml of deionized water, then blow in nitrogen gas, and stir at room temperature for 30min. Will K 2 S 2 o 8 solution (0.068g K 2 S 2 o 8 dissolved in 30ml deionized water) was added to the above solution, and the temperature was raised to 70° C. under a nitrogen...

Embodiment 2

[0038] 1. Preparation of carbon quantum dot solution:

[0039]Take 1g of egg yolk and heat it up to 250°C at a heating rate of 10°C / min under a nitrogen atmosphere, keep it warm for 2 hours, and cool it down to room temperature naturally to obtain a black powder. Dissolve 0.1 g of the black powder in 10 g of absolute ethanol, centrifuge at 10,000 rpm for 20 min after magnetic stirring for 30 min, take the centrifuged supernatant and filter it three times with a 200 nm ultrafiltration membrane, and use a carbon quantum dot solution with a concentration of 1 wt % for future use.

[0040] 2. The preparation method of poly-N-isopropylacrylamide (PNIPAM) solution is the same as in Example 1.

[0041] 3. Preparation of temperature-sensitive fluorescent carbon nanocomposites:

[0042] Dissolve 0.89g of acrylamide (AAm) in 30mL of deionized water, add 138mg of N,N-methylenebisacrylamide (MBA), mix well and add 3mL of carbon quantum dot solution with a concentration of 1wt% and a conc...

Embodiment 3

[0044] 1, the preparation method of carbon quantum dot solution is the same as embodiment 1:

[0045] 2. The preparation method of poly-N-isopropylacrylamide (PNIPAM) solution is the same as in Example 1.

[0046] 3. Preparation of temperature-sensitive fluorescent carbon nanocomposites:

[0047] Dissolve 0.94g of acrylamide (AAm) in 30mL of deionized water, add 138mg of N,N-methylenebisacrylamide (MBA), mix well and add 5mL of carbon quantum dot solution with a concentration of 1wt% and a concentration of 0.98 Add 3mL of wt% polyisopropylacrylamide solution, then dropwise add 13mg of tetraethylethylenediamine (TEMED), after it is completely dissolved, finally add 4mL of 28mmol / L potassium thiosulfate solution, and let it stand at room temperature After 6 hours, the temperature-sensitive fluorescent carbon nanocomposite material can be obtained.

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Abstract

The invention belongs to the field of a composite intelligent fluorescent material, and in particular relates to a thermo-sensitive fluorescent carbon nano composite material and a preparation method thereof. The fluorescent material is prepared by the steps of adding N,N-methylene bisacrylamide in an acrylamide water solution, and mixing; adding 0.3-3wt% of a carbon quantum dot solution, 0.5-2.5wt% of a poly N-isopropyl acrylamide solution and tetraethylethylenediamine in mixing liquid, adding an initiator after dissolving, and standing by for 3-8 hours to obtain the fluorescent material. The initiator is either thiosulfate or persulfate. According to the fluorescent material disclosed by the invention, with the addition of the carbon quantum dot, the fluorescence of the composite material is guaranteed, by introducing the N-isopropyl acrylamide, the composite material is thermo-sensitive, and by adding the acrylamide, the mechanical strength of the semi-interpenetrating network structure of the composite material is enhanced; and the composite is free from toxicity, environment-friendly and good in stability; and the thermo-sensitive fluorescent carbon nano composite material is simple in preparation process, low in raw material price, and free from toxicity and pollution in a synthesis process.

Description

technical field [0001] The invention belongs to the field of composite intelligent fluorescent materials, in particular to a temperature-sensitive fluorescent carbon nanocomposite material and a preparation method thereof. Background technique [0002] In recent years, smart materials are emerging high-tech cutting-edge materials, which are a new type of materials that respond to environmental perception and have functional execution capabilities. Temperature-sensitive smart materials in smart materials have been paid attention to because they can sense small changes or stimuli in the external environment temperature. In 1984, Tanaka reported that poly N-isopropylacrylamide (PNIPAM) hydrogel has temperature-sensitive characteristics, and its side chain contains both clear water groups and hydrophobic groups, while the hydrophilic and hydrophobic groups There is a hydrophilic / hydrophobic balance between the groups under the influence of temperature, and PNIPAM hydrogel has a...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/54C08F2/44C08K3/04C08L33/24C09K11/65
Inventor 李盼盼黄磊
Owner SHANGHAI NORMAL UNIVERSITY
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