Kinetic Sand Through the Microscope and FTIR Spectra скачать в хорошем качестве

Kinetic Sand Through the Microscope and FTIR Spectra

Hooke College of Applied Sciences • Exploring Kinetic Sand Through the Microscope Read the full article here: https://www.mccrone.com/mm/sand-galle... NOTE: This video has no audio. Kinetic Sand® comes in a wide variety of colors and the company’s website claims that the product is made up of 98% sand and 2% magic. That naturally intrigued us, so we investigated the sand and the magic part a bit further by looking at it through a stereomicroscope. If you visit the Kinetic Sand website they don’t mention how they get the sand to stick together, which gives it a similar feel and texture to wet sand. Searching a bit more online you’ll find that this particular product uses polydimethylsiloxane (PDMS) to coat the grains of sand to impart its “hard to put down” quality. PDMS is also used in the iconic product Silly Putty® giving the product it characteristic viscoelastic properties. Looking at Kinetic Sand through a stereomicroscope you can see the sand grains almost “magically” connecting with each other with colorless material coating the sand and holding everything together. When pulled apart, the sand grains slowly separate with the fine, colorless strands of this magical material stretching between. The colorless strand will eventually break into sections, with each piece snapping back to its nearest sand grain. We have captured this in the video below. These fine strands are really difficult to sample directly, and after a few frustrating attempts, a sample of the Kinetic Sand was placed on a glass microscope slide and a small drop of hexane was added to rinse off some of the material coating from all the individual sand grains, otherwise known as the “bit of magic.” At the end of the video we have included some FTIR spectra confirming the presence of PDMS.