Saturday, November 29, 2014

SEM data files and image generation script

I've posted some sample data files from my SEM, and also the MATLAB/Octave script that I use to convert them into images:

Let me know if you have any questions.

This is the support structure underneath a single DLP mirror.  The width of each mirror is about 10 microns.

Ben answers your questions #1

I experiment with zinc oxide in a vacuum chamber, and answer your questions from the previous video.  If this format is successful, I'll do another Q/A session in the future.

Monday, November 10, 2014

Color-changing Zinc Oxide -- and submit your questions for Ben

Submit your questions for Ben in the comments section for a Q and A session next week.

Heating zinc oxide with a blow torch causes it to turn from a white powder into a golden yellow.  The process reverses when the substance cools back down to room temperature.  The heat drives out some oxygen from the ZnO lattice, cause some locations to have a Zinc metal ion.  This disruption in the lattice is able to absorb more blue and violet light, causing the overall substance to look yellow.

Monday, November 3, 2014

How a Crookes radiometer works

A Crookes radiometer is driven by a thermal gas effect, and not "light pressure" as often thought.  I demonstrate the radiometer in a vacuum chamber and explain its optimal running pressure.