Chain-bead-shaped silicon carbide nano material and preparation method and application thereof
A technology of nanomaterials and silicon carbide, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., to achieve the effects of short process cycle, improved mechanical properties, and low requirements for preparation conditions
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[0050] Example 1
[0051] The present embodiment provides a preparation method of a one-dimensional SiC nanomaterial with a chain bead hierarchical structure, and the preparation method is as follows:
[0052] S1. Configuration of the pre-spinning solution
[0053] S1-1. Solute configuration
[0054] (1) Carbon source: polyacrylonitrile (PAN): 4.1 wt% (mass percentage);
[0055] (2) Silicon source: Polycarbosilane (PCS): 9.8 wt% (mass percentage).
[0056] S1-2. Solvent configuration:
[0057] Pre-spinning solvent content (the remaining part of the total solution, the solvent here is the mixed solvent of solvent 1 and solvent 2, the percentage is the percentage of each solvent formula, not the percentage of the total solution)
[0058] The solvent content is divided into two parts:
[0059] (1) Solvent 1: N,N-Dimethylformamide (N,N-Dimethylformamide, DMF) is a carbon source solvent: 10wt% (mass percentage); xylene is a silicon source solvent: 90 wt% (mass percentage) ; ...
Example Embodiment
[0070] Example 2
[0071] Example 2 is basically the same as Example 1, except that the content of polyacrylonitrile is adjusted to 3%, and the content of polycarbosilane is adjusted to 12%, that is, the ratio of silicon source to carbon source is increased.
[0072] Among them, S1-2. Solvent configuration:
[0073] Pre-spinning solvent content (the remaining part of the total solution, the solvent here is the mixed solvent of solvent 1 and solvent 2, the percentage is the percentage of each solvent formula, not the percentage of the total solution)
[0074] The solvent content is divided into two parts:
[0075] (1) Solvent 1: N,N-Dimethylformamide (N,N-Dimethylformamide, DMF) is a carbon source solvent: 10wt% (mass percentage); xylene is a silicon source solvent: 90 wt% (mass percentage) ;
[0076] (2) Solvent 2: This solvent is a solubilizer, which is a mixed solvent of Tween 80 and high-purity ethanol, and the ratio of the two is 1:5;
[0077] The solvent 1 and solvent...
Example Embodiment
[0080] Example 3
[0081] Example 3 is basically the same as Example 1, except that the content of polyacrylonitrile is adjusted to 5.2%, and the content of polycarbosilane is adjusted to 8.3%, that is, the ratio of silicon source to carbon source is reduced. The final microscopic appearance of its products is as follows: Figure 5 As shown in the figure, it can be seen that the structure is also in the shape of a chain bead, but compared with Example 1, the connection between the chain beads is wider and thicker, and the phenomenon of agglomeration and agglomeration of the chain beads exists at the same time.
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