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Novel preparation method of nano-silica microcapsule

A nano-silica and microcapsule technology, applied in the directions of silica and silica, can solve the problems of agglomeration of silica hollow microspheres, different particle sizes, complicated preparation process, etc. The effect of short reaction time and strong reaction controllability

Active Publication Date: 2019-09-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is important to find a novel method for preparing nano-silica microcapsules to overcome the complex, time-consuming preparation process of the prior art, the agglomeration of the obtained hollow silica microspheres, and different particle sizes. research significance

Method used

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  • Novel preparation method of nano-silica microcapsule
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  • Novel preparation method of nano-silica microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 0.8953g disodium hydrogen phosphate and 0.0164g sodium hydroxide in 6ml deionized water to prepare Na 2 HPO 4 12H 2 O-NaOH buffer solution, measure Na 2 HPO 4 12H 2 Add 3ml of O-NaOH buffer solution and 50ml of absolute ethanol into a 100ml round bottom flask at the same time, adjust the speed of the magnetic stirrer to 400-600r / min, and stir for 20min. Add 1ml tetraethyl orthosilicate to the above solution, adjust the speed of the magnetic stirrer to about 1200r / min, stir for 3min, and restore the speed to 400-600r / min, after stirring for 5 hours, the reaction is complete, stop stirring. Pour the completed solution into a centrifuge tube, centrifuge at 10,000r / min for 15min, remove the supernatant, add water and sonicate, repeat several times, wash with water until pH = 7, and obtain a particle size of 310nm and a capsule thickness of 18.5nm nano-SiO 2 Microcapsules.

Embodiment 2

[0032] Dissolve 0.8953g disodium hydrogen phosphate and 0.0444g sodium hydroxide in 6ml deionized water to prepare Na 2 HPO 4 12H 2 O-NaOH buffer solution, measure Na 2 HPO 4 12H 2 Add 3ml of O-NaOH buffer solution and 50ml of absolute ethanol into a 100ml round bottom flask at the same time, adjust the speed of the magnetic stirrer to 400-600r / min, and stir for 20min. Add 1ml tetraethyl orthosilicate to the above solution, adjust the speed of the magnetic stirrer to about 1200r / min, stir for 3min, and restore the speed to 400-600r / min, after stirring for 5 hours, the reaction is complete, stop stirring. Pour the solution that has completed the reaction into a centrifuge tube, centrifuge at a speed of 10,000r / min for 15 minutes, remove the supernatant, add water and sonicate, repeat several times, wash with water until pH = 7, and obtain a particle size of 248nm and a capsule thickness of 14nm. nano-SiO 2 Microcapsules.

Embodiment 3

[0034] Dissolve 0.8953g disodium hydrogen phosphate and 0.0164g sodium hydroxide in 6ml deionized water to prepare Na 2 HPO 4 12H 2 O-NaOH buffer solution, measure Na 2 HPO 4 12H 2 Add 6ml of O-NaOH buffer solution and 50ml of absolute ethanol into a 100ml round bottom flask at the same time, adjust the speed of the magnetic stirrer to 400-600r / min, and stir for 20min. Add 1ml tetraethyl orthosilicate to the above solution, adjust the speed of the magnetic stirrer to about 1200r / min, stir for 3min, and restore the speed to 400-600r / min, after stirring for 5 hours, the reaction is complete, stop stirring. Pour the solution that has completed the reaction into a centrifuge tube, centrifuge at a speed of 10,000r / min for 15 minutes, remove the supernatant, add water and sonicate, repeat several times, wash with water until pH = 7, and obtain a particle size of 391nm and a capsule thickness of 31nm. nano-SiO 2 Microcapsules.

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Abstract

The invention relates to a novel preparation method of a nano-silica microcapsule, and belongs to the field of inorganic nano-materials. The SiO2 microcapsule is prepared by a solution gel technology using a Na2HPO4.12H2O-NaOH buffer solution as a catalyst. The obtained nano-silica microcapsule has a diameter of 200-450 nm and a capsule thickness of 10-35 nm, and especially the dimension of microcapsule is monodisperse or narrowly dispersed. The method has the characteristics of simplicity and easiness in operation, short reaction time, controllable form, regular morphology, uniform and small wall thickness and large cavity structure. The nano-silica microcapsule of the invention can be widely used in the fields of biomedicines, electronics, catalyst carriers, biological materials, engineering materials and the like as a carrier.

Description

technical field [0001] The invention relates to a preparation method of nano-silica microcapsules, especially the thickness of the capsule wall, the diameter of the microcapsule and the shape of the microcapsule are controllable, which can achieve narrow dispersion or monodispersion, and belongs to the field of inorganic nanometer materials. Background technique [0002] As a member of the nanomaterial family, nano-silica material has potential application value in the field of scientific and industrial research, so its development and research have important practical significance. Among them, nano-silica microcapsules are a kind of hollow spherical shell-like nanoscale materials with a spherical shape, also known as silica hollow microspheres. Because of its controllable morphology, good chemical and physical properties, large surface area, strong hydrophilicity and easy chemical modification, it is widely used in the fields of catalysis, bioimaging, drug and gene loading[...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2004/64C01P2004/04C01P2004/62C01P2004/34
Inventor 李筱晗刘巍朱晓莲李春明
Owner TIANJIN POLYTECHNIC UNIV
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