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Method for preparing nano fluorescence thermometer

A nano-fluorescence and thermometer technology, which is applied in the field of preparation of fluorescent nano-thermometers, can solve the problems of limiting the applicability of AIE molecules, limiting internal rotation, and reducing non-radiative transitions.

Inactive Publication Date: 2011-07-06
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is mainly due to the fact that in the aggregated state, the internal rotation of AIE molecules is greatly restricted, the non-radiative transition is greatly reduced, and at the same time, the quantum efficiency of fluorescence is greatly improved.
However, under normal circumstances, AIE molecules can only have good luminescence enhancement properties in macroscopic aggregation states such as polymer films, crystals, and poor solvents. When they are uniformly dispersed in good solvents, almost no fluorescence can be detected, which is severely limited. The applicability of AIE molecules in practical fields

Method used

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  • Method for preparing nano fluorescence thermometer
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Examples

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Embodiment 1

[0021](1) In a reactor containing 185ml of distilled water, weigh 0.5g of NIPAM and add it, and then add 4ml of styrene polymerized monomer after it is completely dissolved, stir vigorously at a speed of 300 rpm at room temperature, and discharge oxygen for 30 minutes with nitrogen gas, Then be warming up to 70 DEG C, then add 15 ml of aqueous solution containing 0.15 g potassium persulfate to initiate polymerization, the solution gradually becomes milky white emulsion from clarification, the reaction is maintained at 70 DEG C, stirred, and carried out for 12 hours, then down to room temperature and filtered with ordinary filter paper, A polymer emulsion is obtained. The polymer emulsion was repeatedly centrifuged and washed with distilled water for 3 times, and diluted with distilled water to finally obtain a 100ml emulsion of polymer nanospheres;

[0022] (2) Disperse all the polymer nanospheres obtained in step (1) into a reactor containing 185ml of distilled water, weigh 4...

Embodiment 2

[0025] (1) In a reactor containing 185ml of distilled water, weigh 2.0g of VCL and add it. After completely dissolving, add 5ml of styrene polymerized monomer. Stir vigorously at room temperature at a speed of 400 r / min. Pass nitrogen to exhaust oxygen for 50 minutes. Then be warming up to 80 DEG C, then add 15 ml of aqueous solution containing 0.20 g ammonium persulfate to initiate polymerization, the solution gradually becomes a milky white emulsion from clarification, the reaction is maintained at 80 DEG C, stirred, and carried out for 15 hours, then down to room temperature and filtered with ordinary filter paper, A polymer emulsion is obtained. Repeatedly centrifuging and washing the product 4 times with distilled water to obtain polymer nanospheres;

[0026] (2) Redisperse all the polymer microspheres obtained in step (1) into a reactor containing 185ml of distilled water, weigh 5.0g of VCL, and add 0.20ml of MA into the reaction vessel, stir vigorously, and remove nitro...

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Abstract

The invention belongs to the field of high polymer materials, and relates to a method for preparing a nano fluorescence thermometer based on thermosensitive controllable nano microspheres with fluorescence property. The method comprises the following steps of: synthesizing core / shell-structured polymer nano microspheres with thermosensitive characteristic; and compounding fluorescent molecules with aggregation-induced emission (AIE) property into the shell layers of the microspheres to realize sudden fluorescence enhancement of the fluorescent molecules so as to obtain the thermosensitive controllable nano hydrogel microspheres with the fluorescence property, wherein the fluorescence intensity of the microspheres is linearly reversibly reduced or enhanced with the rise and reduction of the ambient temperature, and the microspheres have high stability in a range of 2 to 95DEG C. The thermosensitive hydrogel material has high application value and good prospect in the aspects such as nano fluorescence thermometers, nano-biomaterials, multi-response sensors and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a method for preparing a fluorescent nanometer thermometer based on nanometer microspheres with fluorescent properties and temperature sensitivity controllable. Background technique [0002] Smart materials are a new type of functional materials that can perceive external stimuli, judge and process them appropriately, and can be executed by themselves. It is one of the important directions for the development of modern high-tech new materials and will support the development of high-tech in the future. As a soft and wet material in smart polymer materials, polymer gels have attracted extensive attention from researchers in recent years. Among them, environmentally sensitive hydrogels are often called smart hydrogels, which means that they can sense small changes or stimuli in the external environment, such as temperature, pH value, light, electricity, solvent composition, ionic st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/00C09K11/06C08F257/02C08F220/54C08F220/06C08F226/06C08J3/075G01K11/32
Inventor 林权杨旭东姜英男马骋杨柏崔占臣董凤霞
Owner JILIN UNIV
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