Making silica aerogel at home

I followed instructions in the silica TMOS recipe from and successfully produced some small pieces of aerogel in my home shop. The two main difficulties are: 1. Getting TMOS or TEOS (the key chemical ingredient), and 2. Building a supercritical drying chamber. The components for the chamber can be bought from or another source of industrial pipe fittings. You’ll also need a supply of liquid carbon dioxide. I used a 20-lbs cylinder, which I bought