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A kind of up-conversion nano-material that can respond to pH value and its preparation method

A nanomaterial and ph value technology, applied in the field of nanomaterials, can solve the problem of not having the intelligent response characteristics of the microenvironment, and achieve the effects of good water solubility, strong optical signal, and simple preparation method.

Inactive Publication Date: 2018-06-29
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing up-conversion nanomaterials already have good optical properties, they still do not have the characteristics of intelligent response to the microenvironment

Method used

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  • A kind of up-conversion nano-material that can respond to pH value and its preparation method
  • A kind of up-conversion nano-material that can respond to pH value and its preparation method
  • A kind of up-conversion nano-material that can respond to pH value and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Upconversion Nanomaterials Responsive to pH Values ​​with a Response Value of pH 5.0

[0035] (1) Weigh LuCl 3 (0.2251g), YbCl 3 (0.0503g) and ErCl 3 (0.0055g), as well as oleic acid (6mL) and octadecene (15mL), in a three-necked flask at 40°C for vacuum deoxygenation, filled with nitrogen, heated to 70°C and then vacuumed; heated to 120°C, reacted for 40min; Finally, the temperature was raised to 160°C and maintained for 5 minutes, then the temperature was naturally lowered to 40°C; NH was added 4 After F (4mmol) and NaOH (2.5mmol), vacuum deoxidize at 40°C, fill with nitrogen, heat up to 70°C and then vacuum; after reacting at 300°C for 60min, cool down to 40°C naturally; put the reaction solution at 12000r / min Centrifuge at a rotating speed, pour off the supernatant, add cyclohexane and ethanol with a volume ratio of 1:1, and ultrasonically disperse. The final product is dispersed with 6mL of cyclohexane, packed into a sample bottle, and obtained by tra...

Embodiment 2

[0042] (1) Weigh YCl 3 (0.0976g), YbCl 3 (0.0503g) and ErCl 3 (0.0055g), and oleic acid (6mL) and octadecene (15mL), deoxidized at 40°C, filled with nitrogen, heated to 70°C and then vacuumed; heated to 130°C, reacted for 60min; heated to 160°C and maintained for 10min Cool down naturally to 40°C; add 0.1481g NH 4 F. After 0.1g NaOH, deoxidize at 40°C, fill with nitrogen, heat up to 70°C and then vacuumize; after reacting at 300°C for 60 minutes, cool down to 40°C naturally; centrifuge the reaction solution at 12000r / min, pour it out To the supernatant, add cyclohexane and ethanol at a volume ratio of 1:1, ultrasonically disperse, and disperse the final product with 9 mL of cyclohexane to elute oleic acid to obtain upconversion nanomaterials that can be dissolved in aqueous solution;

[0043] (2) Weigh hydroquinone (0.0494g), triethylamine (4.3382g), N,N'-diethylethyl alcohol (6.2402g) and tetrahydrofuran (50mL) in sequence, and place in a three-necked flask at 56°C Reflux...

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Abstract

The invention discloses an up-conversion nano material capable of responding to pH value and a preparation method thereof. The method includes: synthesizing a pH-sensitive high molecular material; subjecting the pH-sensitive high molecular material and oleic acid protected up-conversion nanoparticles to ligand exchange to obtain the up-conversion nano material. The up-conversion nano material is used as a substrate and combined with polytertiary amine pH responding polymer to realize pH responding performance of an anti-Stokes shift optical material. In a low-pH water solution, under excitation of near infrared laser, the nano material emits light weakly; after being higher than a specific pH value, light intensity of the nano material can be enhanced by 20 times relative to that when pH value is low; pH conversion interval is only 0.3 pH interval, in other words, the light intensity of the up-conversion nano material can be enhanced by 20 times by only changing proton concentration in a water solution by 2 times. The intelligent-responding up-conversion nano material prepared by the method has high water solubility, high optical signal intensity, low toxicity and sensitive responding performance to pH value of environment.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and specifically relates to an upconversion nanomaterial capable of responding to a pH value and a preparation method thereof. A novel smart upconversion biomarker material that responds to pH in water microenvironments. Background technique [0002] For the field of biomedicine, multifunctional nanomaterials have been extensively studied due to their ability to combine good water solubility, spectral characteristics, and response to external stimuli. [0003] Rare earth-doped upconversion nanomaterials are nanoparticles based on the anti-Stokes shift mechanism that converts long-wavelength laser light into short-wavelength emitted light through a two-photon or multi-photon mechanism. It is used in infrared detection, light-emitting diodes, solar cells, and biomarkers. , in vivo imaging, drug therapy and other fields have a wide range of applications. [0004] Although the existing up-con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/34C08F220/06C08F8/42
CPCC08F8/42C08F220/34C08F220/06
Inventor 黄潇楠李坡刘黎
Owner CAPITAL NORMAL UNIVERSITY
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