Chemicals: All reagents, unless otherwise stated, were obtained from commercial sources (NanoLab Inc, Waltham, MA, USA; Thermo Fisher Scientific Chemicals, MA, USA; Sigma-Aldrich, Darmstadt, Germany; Duksan, Ansan, Korea) and were used without further purification. Specifically, SWNTs (purity > 95%) with an average diameter of 1.5 nm were purchased from NanoLab Inc. (Waltham, MA, USA). Carbon Black (Super P, Conductive 99+% metal basis) was purchased from MTI Corp, CA, USA. Poly(vinylidene fluoride) (PVDF, average Mw~534,000 by GPC, powder), 1-methyl-2-pyrrolidinone (NMP, ReagentPlus®, 99%), sodium sulfate (Na2SO4, ReagentPlus®, 99.0%), and nickel foil (thickness 0.1 mm, 99.98% trace metals basis) were purchased from Sigma-Aldrich. Distilled water was purchased from Duksan. All chemicals were used as received in air.
Distilled water
Manufactured by Duksan Pure Chemicals
Distilled water is a type of high-purity water. It is produced through the process of distillation, which removes impurities and contaminants, resulting in a pure, deionized liquid.
Automatically generated - may contain errors
2 protocols using distilled water
1
Synthesis of SWNT-based Electrodes
2
Silk Fibroin Extraction and Purification
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The raw silk cocoons (Bombyx mori, Uljin silk farm, Korea) were cut into small pieces and degummed two times with 0.3 mM sodium oleate (Junsei, Japan) and 0.5 mM sodium carbonate (OCI, Korea) solution at 103°C for 40 min. Remnant salt was removed by boiling silk in distilled water twice at 100°C for 20 min [25 (link),26 (link)]. The obtained silk fibroin (SF) was rinsed thoroughly with distilled water and dried in a fume hood at room temperature for two days. Dried SF was dissolved in a ternary solvent consisting of calcium chloride (Samchun, Korea), distilled water, and ethyl alcohol (Duksan, Korea) with the molar ratio of 1:8:2. The reaction was continued at 91°C for 3 h. The dialysis was performed with a cellulose membrane tube (MWCO: 12–14 kDa) against distilled water. The distilled water was exchanged seven times every 5 h for 3 days at room temperature. The clear supernatant was collected after centrifugation (9000 rpm for 10 min) and lyophilized (FD8508, IlShinBioBase, Korea). The SF powder was vacuum-packed for long-term preservation.
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