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Morphology regulation and control and preparation method of nano silicon dioxide powder

A nano-silicon dioxide and powder technology, applied in the directions of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems of cumbersome steps, long cycle, and high requirements for hard templates, and achieves green and clean methods, simple preparation methods, and high efficiency. simple effect

Inactive Publication Date: 2020-09-04
张雪原
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN108128781A uses plasma DC transfer arc as a heating source to heat silicon raw materials to form silicon vapor with uniform composition, and the silicon vapor is cooled by carrier gas to form silicon droplets to cool and produce spherical nano-silicon dioxide, but it has high energy consumption and cannot be processed. For the problem of morphology control, Geng et al. controlled the concentration of sodium sulfate aqueous solution and used the hard template method to prepare a series of nano-silica with controllable morphology, such as rice, cube and capsule. Although the hard template is in the shape It is more advantageous in control, but there are cumbersome steps, long cycle time, and the preparation process has high requirements for hard templates, and the structure is prone to collapse and instability after removing the templates. Zhang et al. used double templates to prepare curved rods and straight rods by changing the ratio. Nano-SiO2, and many scientists have also studied the formation of nano-morphology through changes in temperature, reaction time and pH, but the mechanism of shape-controlled synthesis is still unclear and systematic

Method used

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  • Morphology regulation and control and preparation method of nano silicon dioxide powder
  • Morphology regulation and control and preparation method of nano silicon dioxide powder
  • Morphology regulation and control and preparation method of nano silicon dioxide powder

Examples

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Effect test

Embodiment 1

[0024] A preparation method of silica nanopowder:

[0025] (1) Add 15 mg of absolute ethanol to 220 mg of distilled water, and ultrasonically oscillate evenly to obtain solution 1;

[0026] (2) Under ultrasonic vibration, add 11 mg tetraethyl orthosilicate (TEOS) into solution 1, and ultrasonically oscillate for 30 minutes to obtain solution 2;

[0027] (3) Adjust the pH value of solution 2 to 10 with 0.1M ammonia water, then add 121mg polyvinylpyrrolidone (PVP), 33mgNaBr and 11mgNaNO 3 , and the obtained reaction system was stirred and reacted at a reaction temperature of 70° C. for 4 hours to obtain a solution 3;

[0028] (4) Solution 3 is centrifugally washed with absolute ethanol, then washed with water, and vacuum-dried for 20 hours to obtain a nano-silica powder with a flaky shape. Since the length of the pore of the flaky shape is relatively shorter than that of the traditional spherical The particles are shorter and have better application in the field of catalysts, ...

Embodiment 2

[0030] A preparation method of silica nanopowder:

[0031] (1) Add 15 mg of absolute ethanol to 220 mg of distilled water, and ultrasonically oscillate evenly to obtain solution 1;

[0032] (2) Under ultrasonic vibration, add 11 mg tetraethyl orthosilicate (TEOS) into solution 1, and ultrasonically oscillate for 30 minutes to obtain solution 2;

[0033] (3) Adjust the pH value of solution 2 to 10 with 0.1M ammonia water, then add 121mg polyvinylpyrrolidone (PVP), 11mgNaBr and 33mgNaNO 3 , and the obtained reaction system was stirred and reacted at a reaction temperature of 70° C. for 4 hours to obtain a solution 3;

[0034] (4) The solution 3 was centrifuged and washed with absolute ethanol, then washed with water, and vacuum-dried for 20 hours to obtain a nano-silica powder with rod-like morphology. Because the silica pore length of rod-shaped shape is relatively long with respect to the flaky powder pore channel of traditional spherical powder and embodiment 1 (as figure ...

Embodiment 3

[0036] A preparation method of silica nanopowder:

[0037] (1) Add 15 mg of absolute ethanol to 220 mg of distilled water, and ultrasonically oscillate evenly to obtain solution 1;

[0038] (2) Under ultrasonic vibration, add 11 mg tetraethyl orthosilicate (TEOS) into solution 1, and ultrasonically oscillate for 30 minutes to obtain solution 2;

[0039] (3) Adjust the pH value of solution 2 to 10 with 0.1M ammonia water, then add 121mg polyvinylpyrrolidone (PVP), 22mgNaBr and 22mgNaNO 3 , and the obtained reaction system was stirred and reacted at a reaction temperature of 70° C. for 4 hours to obtain a solution 3;

[0040] (4) The solution 3 was washed by centrifugation with absolute ethanol, then washed with water, and vacuum-dried for 20 hours to obtain a nano-silica powder with a transitional morphology of rods and sheets, thus proving that Br - and NO 3 - The relative addition amount is the key to inducing the formation of silica with flake or rod-like morphology.

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Abstract

The preparation method provided by the invention is simple; water is mainly used as a solvent; the method is simple, green and clean; silicon dioxide nano-powder with two morphologies can be obtainedthrough regulation and control by a simple means; effective support is provided for morphology regulation and control of silicon dioxide; the flaky nano silicon dioxide is synthesized for the first time; the morphology of the nano silicon dioxide is accurately controlled by regulating and controlling the proportion of two anions, so that the flaky and rodlike mutual conversion is realized, an unexpected technical effect is achieved, and the nano silicon dioxide with different morphologies can be applied to various fields of catalytic reaction, drug sustained release and the like due to different pore lengths of the nano silicon dioxide.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic nano-materials, in particular to a method for controlling the morphology of nano-silica powder and preparing and producing it. Background technique [0002] Nano-silica material is a kind of nano-material prepared from inorganic silane. It has low toxicity, small particle size, high purity, good biocompatibility and stable physical and chemical properties. It also has nano-small size effect and surface effect. It is used in drug delivery, Adsorption materials, catalytic conversion, cellular uptake, luminescent properties and sensing have a wide range of applications. Nowadays, the preparation and application research of nano-silica powder has become a hot spot in the field of inorganic materials. [0003] The production method of silica powder has gone through decades of history, mainly divided into two types of preparation methods: dry method and wet method. -Gel method, microe...

Claims

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Application Information

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IPC IPC(8): C01B33/18B82Y40/00
CPCB82Y40/00C01B33/18C01P2004/03C01P2004/04C01P2004/16C01P2004/20
Inventor 张雪原
Owner 张雪原
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