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Method for preparing two-dimensional nano materials through hypergravity coupling

A two-dimensional nanomaterial and two-dimensional material technology, applied in the field of supergravity coupling to prepare two-dimensional nanomaterials, can solve the problems of high impurity content and difficult separation and removal, and achieve low-cost effects

Active Publication Date: 2019-08-30
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large number of experimental results show that the graphene products separated by this method have high impurity content and are difficult to separate and remove.

Method used

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  • Method for preparing two-dimensional nano materials through hypergravity coupling
  • Method for preparing two-dimensional nano materials through hypergravity coupling
  • Method for preparing two-dimensional nano materials through hypergravity coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using isopropanol aqueous solution as stripping solution, graphite as raw material, few-layer graphene material was prepared by supergravity coupling.

[0044] Among them: the specific gravity of the stripping liquid is between 0.955 and 0.956 g / ml, and it begins to freeze below -8°C, and the stripping liquid can completely wet the graphite sheet.

[0045] This embodiment adopts as Figure 5 The shown high-gravity coupled device for preparing two-dimensional nanomaterials is realized. The device includes a cooling cycle system composed of a refrigeration cycle pump 7 and a tube-and-tube heat exchanger 8, a high-gravity cycle stripping system, and a high-gravity cycle concentration system. Gravity circulation stripping system comprises the hypergravity coupling machine I 11 that communicates with the first metering tank 10, the first magnetic pump 9 and the cooling circulation system through pipelines; The second magnetic pump 14 is connected to the supergravity couplin...

Embodiment 2

[0061] During the preparation of graphene, the highest supergravity field levels for one rotation of the separation units of the hypergravity coupling machines I and II are still 3170 g and 4733 g, respectively. The difference between Embodiment 2 and Embodiment 1 is that the flow section of the secondary rotating flow channel in the supergravity coupling machine I is a circle with a diameter of 2 mm, and the radial length is 120 mm. The secondary rotating flow channel in the high gravity coupling machine I The radial dimension of is 1.5 times the radial dimension of the secondary rotating flow channel in the supergravity coupling machine II. The flow ratio of graphite concentrated slurry and low-concentration graphene solution is controlled at 0.5:1; the axial average linear velocity of graphite concentrated slurry reaches 65 m / s. During the stripping process, the temperature was controlled at -4°C; during the concentration process, the temperature was controlled at 1°C. In ...

Embodiment 3

[0063] During the preparation of graphene, the highest supergravity field levels for one rotation of the separation units of the supergravity coupling machine I and II are still 3170 g and 4733 g, respectively. The difference between embodiment 3 and embodiment 1 is: the flow section of the secondary rotating flow channel in the supergravity coupling machine I is a circle with a diameter of 6mm, and the radial length is 120mm, and the secondary rotating flow channel in the high gravity coupling machine I The radial dimension is twice the radial dimension of the secondary rotating flow channel in the supergravity coupling machine II; the flow ratio of the graphite thick slurry and the low-concentration graphene solution is controlled at 2:1; the axial average of the graphene slurry The line speed is 65 m / s. During the stripping process, the temperature was controlled at -3°C; during the concentration process, the temperature was controlled at 2°C. In step (1), the concentratio...

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Abstract

The invention relates to the technical field of nano materials, and provides a method for preparing two-dimensional nano materials through hypergravity coupling in order to solve the problems of low efficiency and high energy consumption, low single layer rate, wide lamellar size distribution, low yield and the like in the traditional two-dimensional nano material preparation process. The method comprises the steps that (1) the temperature of two-dimensional material coarse slurry is reduced to a preset value; (2) large solution circulation is started; (3) the separated two-dimensional nano material dilute solution flows into a circulating concentration system and the coarse slurry is diluted back to the original concentration by a stripping liquid flowing from the circulating concentration system; (4) after the dilute solution flows into the circulating concentration system, the dilute solution flows into a second hypergravity coupling machine, and the separated stripping liquid flowsinto a circulating stripping system; and (5) fine slurry is discharged and the coarse slurry is supplemented. The method for preparing the two-dimensional nano materials through hypergravity couplingcan achieve rapid, efficient, energy-saving, low-cost, large-batch and high-quality production of various two-dimensional layered nano materials.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing two-dimensional nanomaterials through supergravity coupling. Background technique [0002] High-gravity technology is a new technology to strengthen multiphase flow transfer and reaction process. Due to its wide applicability and its small size, light weight, low energy consumption, easy operation, easy maintenance, safety, reliability and The advantages of flexibility and better adaptability to the environment make supergravity technology have broad commercial application prospects in environmental protection, materials, biology, chemical and other industrial fields. The basic principle of high-gravity engineering technology is to use the unique flow behavior of multi-phase flow system under the condition of high-gravity field to strengthen the relative velocity and mutual contact between phases, so as to realize the efficient momentum, mass and heat...

Claims

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Application Information

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IPC IPC(8): B04B5/00B01F9/00B82Y40/00C01B32/19
CPCB04B5/00B82Y40/00C01B32/19B01F23/4146B01F29/15
Inventor 王东光陶亨聪葛志强文建军王玉华
Owner ZHEJIANG OCEAN UNIV
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