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Method for measuring water content in organic solvent through utilization of upconversion nanometer particles

A technology of organic solvents and nanoparticles, which is applied in the field of conversion of luminescence on rare earth nanoparticles, can solve the problems of weak anti-interference ability, poor stability, and non-reusable organic luminescent molecules, achieve good photostability, and detect changes in water content Effect

Inactive Publication Date: 2016-11-16
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the detection sensitivity is high, organic light-emitting molecules cannot be reused, and the anti-interference ability under ultraviolet excitation is weak
Due to the poor photostability of UV-excited organic light-emitting molecules, it is not suitable for in-situ or long-term real-time water detection.

Method used

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  • Method for measuring water content in organic solvent through utilization of upconversion nanometer particles
  • Method for measuring water content in organic solvent through utilization of upconversion nanometer particles
  • Method for measuring water content in organic solvent through utilization of upconversion nanometer particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] By testing NaYF when organic solvents contain different water contents 4 : The emission spectrum of Yb / Er nanoparticles is used to fit the relative light intensity change curve with water content, taking N,N-dimethylformamide as an example.

[0026] (1) Configure the sample to be tested

[0027] NaYF 4 : Yb / Er nanoparticles dispersed in N, N-dimethylformamide with water content of 0.008, 0.024, 0.108, 0.308, 0.808, 1.508, 3.008, 8.008, 10, 50, 100% (volume ratio), and to be The assay system contained the same concentration of nanoparticles (0.1 mg / mL).

[0028] (2) Acquisition of emission spectra of up-conversion nanoparticles

[0029] The up-conversion emission spectrum was collected on a fluorescence spectrophotometer connected to an external power-adjustable 980 nm laser ( image 3 ). The scanning range is 400nm to 700nm, the scanning speed is 240nm / min, the excitation and emission grating widths are both 10nm, and the gain voltage is 800V. The selected 980nm i...

Embodiment 2

[0036] By testing NaYF when organic solvents contain different water contents 4 : The emission spectrum of Yb / Er nanoparticles is used to fit the curve of relative light intensity changing with water content, taking dimethyl sulfoxide as an example.

[0037] (1) Configure the sample to be tested

[0038] NaYF 4 : Yb / Er nanoparticles are dispersed in dimethyl sulfoxide with water content of 0.008, 0.024, 0.108, 0.308, 0.808, 1.508, 3.008, 8.008, 10, 50, 100% (volume ratio), and the system to be tested contains the same Concentration of nanoparticles (1mg / mL).

[0039] (2) Acquisition of emission spectra of up-conversion nanoparticles

[0040] The up-conversion emission spectrum was collected on a fluorescence spectrophotometer connected to an external power-adjustable 800 nm laser ( Figure 5 ). The scanning range is 400nm to 700nm, the scanning speed is 240nm / min, the excitation and emission grating widths are both 10nm, and the gain voltage is 800V. The selected 800nm ​...

Embodiment 3

[0047] By testing NaYF when organic solvents contain different water contents 4 : The emission spectrum of Yb / Er nanoparticles is used to fit the relative light intensity change curve with water content, taking ethanol as an example.

[0048] (1) Configure the sample to be tested

[0049] NaYF 4 : Yb / Er nanoparticles are dispersed in ethanol with water content of 0.008, 0.024, 0.108, 0.308, 0.808, 1.508, 3.008, 8.008, 10, 50, 100% (volume ratio), and the system to be tested contains the same concentration of nanoparticles (2 mg / mL).

[0050] (2) Acquisition of emission spectra of up-conversion nanoparticles

[0051] The up-conversion emission spectrum was collected on a fluorescence spectrophotometer connected to an external power-adjustable 1500 nm laser ( Figure 5 ). The scanning range is 400nm to 700nm, the scanning speed is 240nm / min, the excitation and emission grating widths are both 10nm, and the gain voltage is 800V. The selected 1500nm is the optimal excitation w...

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Abstract

The invention provides a method for measuring the water content in an organic solvent through utilization of upconversion nanometer particles excited by near infrared laser based on a phenomenon that an energy quenching effect happens in upconversion nanometer particles containing water. The method comprises: dispersing nanometer particles in an organic solvent with known water content, measuring the emission spectrum of the nanometer particles, making a standard curve corresponding to a log value of a water content based on a ratio of an emission spectrum integral area to the emission spectrum integral area with 100% of a water content, and calculating the water content according to the emission intensity of a unknown sample. Market-oriented upconversion nanometer particles are adopted to achieve long-term stable illumination and can be recycled. The near-infrared laser excitation high in interference resistance and fast in response is used to detect the water content in an organic solution. The detection can reach a ppm degree, and the method is easy to popularize.

Description

technical field [0001] The invention relates to the field of up-conversion luminescence of rare earth nanoparticles, in particular to a method for detecting water content in an organic solvent by using rare earth nanoparticles under the irradiation of a near-infrared laser. Background technique [0002] Water is an essential component of living organisms and is essential for the survival of all life. However, even a small amount of water in crude oil, organic solvents, electrical devices, and medicinal materials will have adverse effects on their storage and use. For example, the water content of commercial crude oil is greater than 1%. From the perspective of pipeline transportation and vehicle and ship transfer, transporting crude oil with high water content will not only consume more power and heat energy, but also bring troubles to refinery processing. Therefore, water detection is not only of great significance in basic research, but also has great prospects in the fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63G01N21/64
Inventor 闾敏谢小吉郭少红黄维黄岭
Owner NANJING TECH UNIV
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