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Aluminum foil

Manufactured by Thermo Fisher Scientific
Sourced in United States, Germany

Aluminum foil is a thin, flexible sheet of aluminum metal typically used for various purposes in a laboratory setting. It serves as a versatile material that can be used to cover, wrap, or line surfaces as needed.

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5 protocols using aluminum foil

1

Protein Content Determination by Dumas Combustion

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Protein content was determined by an automatic elemental analyzer (Rapid N exceed, Elementar Analysensysteme GmbH, Hanau, Germany), the factor of 5.83 was used to convert measured nitrogen into protein according to Dumas combustion method [36 ]. About 20 mg samples were separately prepared in aluminum foil (50 × 50 mm, Alfa Aesar, Fisher Scientific, Waltham, MA, USA) and covered tightly for analysis. Ash and moisture were examined by AOAC methods [32 ].
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2

Butterfly Wing Reflectance Spectroscopy

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Reflectance spectra were measured from a 250 µm 2 region of the surface of intact wing sections, and thus represent the combined reflectance of cover scales, underlying ground scales, and wing membrane (Stavenga et al., 2014) (link). Reflectance measurements were taken using a custom-built microspectrophotometer (20/20PV, CRAIC Technologies, Inc., San Dimas, CA, United States) equipped with a 5× UV-vis objective (LMU-5X-NUV, Thorlabs, Inc., Newton, NJ, United States). Samples were illuminated with a xenon arc lamp (XBO 75 W/2, OSRAM GmbH, Munich, Germany), with the light path oriented normal to the wing surface and coaxial with the axis of light collection. Reflectance spectra were calculated in relation to a high-reflectivity specular reflectance standard (STAN-SSH-NIST, Ocean Optics, Inc., Dunedin, FL, United States). For each scale type, individual spectra were the average of 25 spectra measured consecutively (integration time: 200-350 ms, total measurement time per average spectra: 5-8.75 s). In order to provide a familiar point of comparison, measurements were also taken on the polished and dull side of aluminum foil (0.018 mm, Fisherbrand), and resulted in spectra consistent with other studies (Vukusic et al., 2008; Pozzobon et al., 2020) (link).
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3

Fabrication of Hydrophobic Demolding Reagents

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Aluminum foil (99.99%) was obtained from Alfa Aesar (Karlsruhe, Germany). Perchloric acid (70%), ethyl alcohol anhydrous (99.9%), oxalic acid (99.5%), chromium oxide (Ⅳ) (99%), phosphoric acid (99.5%), and acetone (99.5%) were purchased from Daejung Chemicals (Siheung, Korea). The fluorine hydrophobic demolding reagent, UV-curing polyurethane acrylate resins, and additives were synthesized by referring to the recent report [30 (link)].
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4

Fabrication of PTFE Membrane with Nanoparticles

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PTFE membrane was purchased from DuPont. Aluminum foil (0.025 mm thick, 99.45%) was purchased from Alfa Aesar. PTFE nanoparticle (Kontaflon 85) was purchased from Kontakt Chemie.
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5

Aluminum Foil Annulus Structure

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We used 0.25 mm aluminum foil (Alfa Aesar, Ward Hill, MA) made into a concentric annulus structure, as shown in Figure 1b. To ensure the two layers of Al foil could fit into the 1.8 ml cryovial (Fisher), the height of the aluminum foil hollow cylinder was made to be 13 mm. For the outer Al foil layer, the outer diameter was 9 mm, and we built the inner layer annulus structures with different diameters to ensure the arteries of different thicknesses could fit in the space between the two layers.
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