This section will give a list of items that are used in this project with selected links to suppliers. You can download a more detailed Bill of Materials sheet here.
Note: Many of the items listed are just examples and you can use your own discretion to substitute parts which are easier or cheaper to obtain.
Mold Components
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| Top Mold | Acryllic plate and Transparency film |
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| Bottom mold (mold, top plate and transparency shown) |
Click here to download the .STL files needed to 3D print the molds for this sensor.
Click here to download the .DXF files needed to laser cut the transparencies and plates.
If you would like to modify the molds click here to download the SolidWorks part files.
Polymer Materials
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Soft silicone rubber (EcoFlex 0030, Shore OO-30 hardness, E = 30 kPa) |
Stiff silicone rubber (SORTA Clear 40, Shore A-40 hardness, E = 1.3 MPa) |
Mold Release (Ease Release 200 works well) |
Other Materials
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Velcro material, Loop 3008 type* |
Eutectic indium gallium alloy (EGaIn). Need ~100 uL per sensor though it depends on channel geometry. |
Silpoxy silicone adhesive |
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Transparency film |
Acrylic (1/4" thick) |
*Type selected because it is very thin (low profile)
Tools & Hardware
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Tongue Depressors |
Tweezers | Weights |
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2 small syringes (1.5-3 mL) |
2 needles (27 gauge) |
Electrical wire** |
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Wire Strippers
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**Smaller diameter is better. Here we use 36 AWG copper wire.
Equipment
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Vacuum chamber |
Laser cutter |
Mass scale |
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Lab oven |
Centrifugal mixer |
Mixing cups |
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3D Printer*** |
Spin-coater |
Multimeter |
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Microscope (optional) |
***Minimum need 10x better than dimensions of your structure. i.e. object spatial res. On micron level, but smallest features are 100 microns. Same for FDM. Aim for few hundred microns wide/tall
 | SRT_EGaIn3DPrinterFiles.zip | 1.24 MB |
| SRT_EGaInLaserCutterfiles.zip | 9 KB |
| SRT_EGaInMoldModel.zip | 2.1 MB |
 | EGaIn Detailed BOM.xlsx | 13 KB |