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Researchers from MIT's D-Lab program provided hands-on experience with simple devices they have designed to speed corn shelling and, in background, to make charcoal briquettes from agricultural waste, by compressing the charred material in a mold, using a hammer.
The hydrogel mixture was loaded to a surface-treated PDMS mold using a pipette or a syringe.
Molds with different tip shapes were manufactured by mechanically milling the metallic mold using a micro end mill.
As the polymer film is pressed onto the heated mold using a roller, it becomes softened (or molten stage), where it will fill in the mold cavities under the given pressure.
The membrane pattern was transferred to the negative photoresist SU-8 2025 (MicroChem Corp., MA, USA), thus forming a positive relief mold, using a standard UV lithography technique.
The sleeve and plug were removed and a boric acid (Fischer, Madison, WI) base was then formed by pouring the boric acid over the bottom and sides of the sample and applying 40,000 psi of pressure to the 40×40 mm mold using a Carver Autopellet Press (Wabash, IN).
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If you notice rust or mold, use a cleanser that is specially formulated to deal with these issues.
Two-base component epoxy or polyurethane resins were mixed and put into the molds using a Pasteur pipette.
To make the cocktail boats, Lisa Burton and Nadia Cheng — at the time, graduate students in mechanical engineering — fabricated silicone molds using a 3-D printer.
High-speed molding of continuous carbon fiber-reinforced composites was carried out by thermoplastic resin transfer molding using a very-low-viscosity thermoplastic monomer.
Lotus leaf-like polyurethane/Pluronic® F-127 surface was fabricated via replica molding using a natural lotus leaf as the template.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com