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.

Read more.


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.

Join 27,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — To make it through a tough business cycle, layoffs should be a last resort

Wearables — Hot glue’s undo button

Electronics — Servo Pulses

Python for Microcontrollers — Python on Microcontrollers Newsletter: The Adafruit Learn System Project Bundle, and more! #Python #Adafruit #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — ESP Earrings, RP2040 WiFi, and more!

Microsoft MakeCode — Mechanical Coin Bank

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — NEW PRODUCT – NeoPixel Mini 3535 RGB LEDs w/ Integrated Driver Chip – Black – Pack of 100

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.