You will be shown an abstract from a materials science research paper. Your task is to extract all synthesis operations described in the abstract into a structured JSON format. Your output should be a JSON array. Each entry in the array should be a JSON object describing a single synthesis operation. This object should have the following fields:

- "trigger": A verbal predicate indicating a synthesis operation. This should be a string extracted directly from the abstract.
- "arguments": An array of arguments specifying aspects of the synthesis operation. Each entry in the array should be a length-2 array formatted as [<argument_text>, <argument_type>]. The `argument_text` should be a string extracted directly from the abstract. The `argument_type` should be one of the following types: ["Recipe_Precursor", "Atmospheric_Material", "Participant_Material", "Recipe_Target", "Solvent_Material"].

For instance, suppose an excerpt from the abstract reads:

Tetraethoxysilane (TEOS, 98%) and cetyltrimethylammonium bromide (CTAB, 98%) were purchased from Fluka. The MTTZ-siloxy derivative (triethoxysilyl-propyl-5-mercapto-1-methyl-tetrazole) was synthesized as previously described [38].

This excerpt includes two operations, which could be annotated as follows.

[{"arguments": [["Tetraethoxysilane", "Recipe_Precursor"], ["cetyltrimethylammonium bromide", "Recipe_Precursor"]], "trigger": "purchased"}, {"arguments": [["MTTZ-siloxy derivative", "Recipe_Target"]], "trigger": "synthesized"}]

In your response, please include the JSON and no other text.

Abstract:
10.1016/j.electacta.2014.08.103
Facile synthesis of heterogeneous Ni-Si@C nanocomposites as high-performance anodes for Li-ion batteries

Before the electrical pulse process with Ni wire, Si nanoparticles (0.2, 0.6, and 0.8 g) were first dispersed in 700 mL of OA, and the Si nanoparticles-dispersed suspension was sonicated for 1 h. Then, the electrical wire explosion (NTi-mini P, Nano Tech, Korea) was conducted at a feeding distance of 40 mm and a charge voltage of 320 V in the Si nanoparticles-dispersed suspension. After completing the electrical pulse treatment with Ni wire, the obtained brownish Ni-Si nanocolloidal suspension was sonicated and filtered through a nylon membrane (Durapore, 0.22 mm, Millipore) several times and subsequently dried at 120 degC for 10 h. Finally, the carbon-coated Ni-Si nanocomposites were obtained via carbonization process (heat-treatment) carried out at 500 degC for 5 h in an Ar atmosphere. For comparison, bare Ni nanoparticles were also prepared using the electrical pulse process under the same conditions in a pure OA without any dispersed Si nanoparticles.
[{"arguments": [["OA", "Solvent_Material"], ["Si", "Recipe_Precursor"], ["Ni", "Recipe_Precursor"]], "trigger": "dispersed"}, {"arguments": [["Si", "Recipe_Precursor"]], "trigger": "sonicated"}, {"arguments": [["Si", "Recipe_Precursor"]], "trigger": "conducted"}, {"arguments": [["Ni", "Recipe_Precursor"]], "trigger": "completing"}, {"arguments": [["Ni-Si", "Participant_Material"]], "trigger": "sonicated"}, {"arguments": [["nylon", "Participant_Material"]], "trigger": "filtered"}, {"arguments": [["carbon", "Participant_Material"], ["Ni-Si", "Recipe_Target"]], "trigger": "obtained"}, {"arguments": [["Ar", "Atmospheric_Material"]], "trigger": "carried out"}]