A method for wrapping mesoporous silica on the surface of black phosphorus nanoparticles
A mesoporous silica and nanoparticle technology, applied in the field of biomedicine and nanomaterials, can solve the problems of affecting performance, black phosphorus easy to agglomerate and unstable, and achieve low cost, ease the characteristics of easy agglomeration, and easy drug loading.
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Embodiment 1
[0031] A preparation method for coating mesoporous silica on the surface of black phosphorus nanoparticles, comprising the following steps:
[0032] Weigh 0.2g of black phosphorus powder with a precision electronic scale, suspend it in 25mL of ultrapure water, and shake well. The dispersion was subjected to ice-bath probe ultrasonication for 60 minutes in a probe ultrasonic machine with a power of 300w. In order to prevent excessive heat generation, the mode of the ultrasonic machine was adjusted to ultrasonic for 5 seconds, and then stopped for 2 seconds, and so on for 60 minutes. Change the ice cubes every half hour. After the probe sonication, the dispersion was ultrasonicated in an ice-water bath for 9 hours. The power of the water-bath ultrasonic machine was 300w. In order to prevent excessive heat generation, the ice was changed every 0.5 hours. After the ultrasonication in the water bath, centrifuge with a centrifuge for 2 hours at a speed of 7000 rpm, and set the temp...
Embodiment 2
[0035]The product obtained in Example 1 was subjected to fluorescence lifetime imaging, and the instrument model used was FV1200 / PicoquantFLIM / FCS. A 637nm laser source was used to excite the black phosphorus nanoparticles centrifuged under the conditions of centrifuge parameters of 5000rpm and 40min, and the measured average fluorescence lifetime was 0.788ns. Using a 637nm laser source to excite black phosphorus nanoparticles coated with mesoporous silica and centrifuge them at 5000rpm for 40min, the measured average fluorescence lifetime is 0.289ns, which means that the mesoporous silica is wrapped. The average fluorescence lifetime of silicon oxide black phosphorus nanoparticles is 3.67 times longer than that of uncoated black phosphorus nanoparticles. The black phosphorus nanoparticles used in the fluorescence lifetime imaging in Example 2 and the black phosphorus nanoparticles wrapped with mesoporous silica were all prepared and left for one month before imaging. It can b...
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