Electron Microscope Image of 25-micron Salt Crystal Cubes
Rad photo from the Harnett Lab at the University of Louisville – it’s amazing what you can really, really, really close-up!
In an effort to create tiny holes in our molded rubber parts, we made these small salt crystals by adding concentrated saltwater to alcohol, which is a poor solvent for salt. Right away, it starts to snow 25-micron cubes. The cubes are added to liquid rubber, then dissolved out in water, creating voids–an approach that other groups have used successfully with larger particles like sugar, table salt and rock salt. But can you spot something that isn’t a cube? We had some acrylic microspheres show up in this electron microscope sample, the same material that’s used in acrylic manicures. We were checking out this acrylic powder as another type of sacrificial material to make tiny holes. These plastic spheres charge up easily and seem to get everywhere.
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.