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.2014.04.056
Effects of highly crumpled graphene nanosheets on the electrochemical performances of pseudocapacitor electrode materials

The nickel foam was purchased from Shanghai Zhongwei New Material Co., Ltd. The pore size of the nickel foam ranges from 0.1 mm to 10 mm and its volume density is 0.1 to 0.8 g cm-3. All chemicals were of analytical grade and used without further purification. GS was made via a modified Hummers method followed by a thermal exfoliation (at 800 degC for 1 min under a H2/Ar atmosphere with 10 degC/min heating rate). In a typical synthesis process, 5 mg GS and 0.3 g NiCl2*6H2O were dispersed in 20 ml distilled water and subjected to ultrasonic vibration to form a homogeneous suspension, respectively. The two former suspensions were homogeneously mixed with each other and subjected to ultrasonic vibration for a while, and then freeze drying (named as M1). The 1.03 g NaH2PO2*H2O was grinded in a mortar and mixed with M1. Then, the mixture was calcined at 500 degC for 1 h with 2 degC/min heating rate and cooled to room temperature under a flow of Ar (99.999%). The solid obtained was washed thoroughly with distilled water and absolute ethyl alcohol to remove the by-products. After that, the wet products were dried at 80 degC for 12 h in a vacuum oven.
[{"arguments": [["chemicals", "Participant_Material"]], "trigger": "used"}, {"arguments": [["GS", "Recipe_Target"]], "trigger": "made"}, {"arguments": [["H2/Ar", "Atmospheric_Material"]], "trigger": "thermal exfoliation"}, {"arguments": [["GS", "Recipe_Precursor"], ["water", "Solvent_Material"], ["NiCl2*6H2O", "Recipe_Precursor"]], "trigger": "dispersed"}, {"arguments": [["suspension", "Participant_Material"]], "trigger": "ultrasonic vibration"}, {"arguments": [["suspensions", "Participant_Material"]], "trigger": "mixed"}, {"arguments": [["NaH2PO2*H2O", "Recipe_Precursor"]], "trigger": "grinded"}, {"arguments": [["mixture", "Participant_Material"]], "trigger": "calcined"}, {"arguments": [["Ar", "Atmospheric_Material"]], "trigger": "cooled"}, {"arguments": [["solid", "Participant_Material"], ["ethyl alcohol", "Solvent_Material"], ["water", "Solvent_Material"]], "trigger": "washed"}, {"arguments": [["products", "Participant_Material"]], "trigger": "dried"}]