Two different flexibles substrates were used for the fabrication of the electrochemical capacitors, Kapton® HN films with a thickness of 75 μm from DuPont Corporation (Wilmington, DE, USA) and Polyethylene Terephthalate (PET) foils with a thickness of 160 µm from ColorGATE Digital Output Solutions GmbH (Hannover, Germany). Graphene Oxide at a concentration of 0.4 wt% was acquired from Graphenea (San Sebastián, Spain). The electrolyte was prepared using poly(vinyl alcohol) (PVA, Mw 31,000–50,000, 98%–99% hydrolyzed) and phosphoric acid (H3PO4, product name: 1005731000), both acquired from Sigma-Aldrich (St. Louis, MO, USA). Electrical access to the capacitive devices was printed using a silver-based conductive paint from RS PRO (RS Components, Corby, UK).
Pva mw 31 000 50 000
Manufactured by Merck Group
Sourced in United States
PVA, Mw 31,000–50,000 is a type of polyvinyl alcohol (PVA) with a molecular weight range of 31,000 to 50,000. PVA is a synthetic, water-soluble polymer that is commonly used in various industrial and laboratory applications.
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2 protocols using pva mw 31 000 50 000
1
Flexible Supercapacitors using Graphene Oxide
2
Synthesis of Elastomeric Skin Equivalents
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The materials used for the synthesis of the ESE are PDMS from Dow Corning (Sylgard kit 184; USA), PVA (Mw 31,000-50,000) from SigmaAldrich (USA), Glutaraldehyde (GA) 50% solution reagent grade from AMRESCO (USA), H 2 SO 4 96% solution in water for analysis from Acros Organics (USA), Sodium Chloride (NaCl) from SigmaAldrich (USA). Three commercial artificial skin samples used in this study were: Lorica from Lorica (Italy), Cutinova Hidro from Smith & Nephew plc (UK) and Silicone Skin L7350 supplied by Maag Technic AG, (Switzerland). In addition, pure PDMS and pure PVA cross-linked with Glutaraldehyde 50% solution reagent from VWR International (USA) were also used for comparison.
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