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Up-conversion nano material capable of responding to pH value and preparation method thereof

A technology of nano-materials and ph value, applied in the field of nano-materials, can solve the problems of not having micro-environment intelligent response characteristics, etc., and achieve the effects of good water solubility, strong optical signal, and simple preparation method

Inactive Publication Date: 2017-02-15
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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  • Up-conversion nano material capable of responding to pH value and preparation method thereof
  • Up-conversion nano material capable of responding to pH value and preparation method thereof
  • Up-conversion nano material capable of responding to pH value and preparation method thereof

Examples

Experimental program
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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 Applications(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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