A kind of cellulose nanocrystal-rare earth complex-polyvinyl alcohol composite hydrogel fluorescent probe and its preparation method and application
A technology of rare earth complexes and composite hydrogels, applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of lack of mechanical properties, achieve good mechanical properties, excellent fluorescent properties, biocompatibility and easy degradability Effect
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Embodiment 1
[0070] Example 1 Preparation of cellulose nanocrystal-rare earth complex-polyvinyl alcohol composite hydrogel fluorescent probe PB-CNC-Eu 3+ -I (CNC concentration 0.5wt%, Eu 3+ 0.001g)
[0071] Step 1, the cellulose is prepared into CNC by chemical and mechanical treatment, and the specific method steps include:
[0072] (1) Chemical treatment method:
[0073] 1) preparing a sulfuric acid solution with a mass fraction of 60% for subsequent use;
[0074] 2) Stable the temperature of the prepared sulfuric acid solution oil bath to 45°C and keep stirring;
[0075] 3) When the sulfuric acid temperature is constant, carefully add the cotton fiber to the sulfuric acid at a mass ratio of 1:20, and keep stirring during this process; during the process of adding the cotton fiber, be careful not to pour the cotton fiber on the cup wall and the stirring paddle to prevent impurities from being produced during the subsequent transfer process; after adding cotton fibers, continue heatin...
Embodiment 2
[0088] Example 2 Preparation of cellulose nanocrystal-rare earth complex-polyvinyl alcohol composite hydrogel fluorescent probe PB-CNC-Eu 3+ -Ⅱ (CNC concentration 0.5wt%, Eu 3+ 0.006g)
[0089] Step 1, the cellulose is prepared into CNC by chemical and mechanical treatment, and the specific method steps include:
[0090] (1) Chemical treatment method:
[0091] 1) preparing a sulfuric acid solution with a mass fraction of 60% for subsequent use;
[0092] 2) Stable the temperature of the prepared sulfuric acid solution oil bath to 45°C and keep stirring;
[0093] 3) When the sulfuric acid temperature is constant, carefully add the cotton fiber to the sulfuric acid at a mass ratio of 1:20, and keep stirring during this process; during the process of adding the cotton fiber, be careful not to pour the cotton fiber on the cup wall and the stirring paddle to prevent impurities from being produced during the subsequent transfer process; after adding cotton fibers, continue heatin...
Embodiment 3
[0106] Example 3 Preparation of cellulose nanocrystal-rare earth complex-polyvinyl alcohol composite hydrogel fluorescent probe PB-CNC-Eu 3+ -Ⅲ (CNC concentration 0.5wt%, Eu 3+ 0.01g)
[0107] Step 1, the cellulose is prepared into CNC by chemical and mechanical treatment, and the specific method steps include:
[0108] (1) Chemical treatment method:
[0109] 1) preparing a sulfuric acid solution with a mass fraction of 60% for subsequent use;
[0110] 2) Stable the temperature of the prepared sulfuric acid solution oil bath to 45°C and keep stirring;
[0111] 3) When the sulfuric acid temperature is constant, carefully add the cotton fiber to the sulfuric acid at a mass ratio of 1:20, and keep stirring during this process; during the process of adding the cotton fiber, be careful not to pour the cotton fiber on the cup wall and the stirring paddle to prevent impurities from being produced during the subsequent transfer process; after adding cotton fibers, continue heating...
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