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.jpowsour.2012.12.058
Tailoring of phase composition and morphology of TiO2-based electrode materials for lithium-ion batteries

The mixed titania phases were synthesized via hydrothermal treatment in alkaline environment based on procedure by Yoshida et al. [14]. As starting material TiO2 from Umicore was used which was mixed with NaOH in distilled water. Throughout stirring a homogeneous solution was obtained which was transferred into a Teflon lined autoclave and kept at 150 degC for 72 h. After cooling naturally to ambient temperature the white, sorbet-like product was washed in distilled water to eliminate remaining NaOH before washing in 0.1 M HCl at pH <= 2. In a final washing step the solution was brought to neutrality. Subsequently the product was dried at [?]100 degC, ground and sieved to a 50 μm mesh. In a final preparation step the white powder samples were heat treated in air at 450 degC for 4 h in air. The experimental procedure is shown in a simplified flow chart, see Fig. 1.
[{"arguments": [["titania", "Recipe_Target"], ["environment", "Participant_Material"]], "trigger": "synthesized"}, {"arguments": [["TiO2", "Recipe_Precursor"]], "trigger": "used"}, {"arguments": [["NaOH", "Participant_Material"], ["water", "Solvent_Material"]], "trigger": "mixed"}, {"arguments": [["product", "Participant_Material"], ["water", "Solvent_Material"]], "trigger": "washed"}, {"arguments": [["HCl", "Participant_Material"]], "trigger": "washing"}, {"arguments": [["product", "Participant_Material"]], "trigger": "dried"}, {"arguments": [["powder", "Participant_Material"], ["air", "Atmospheric_Material"]], "trigger": "heat treated"}, {"arguments": [["solution", "Participant_Material"]], "trigger": "stirring"}, {"arguments": [["solution", "Participant_Material"]], "trigger": "brought"}]