Lec 21 | MIT 3.091 Introduction to Solid State Chemistry Engineered Glasses: Network Formers, Network Modifiers, Intermediates Properties of Silicate Glasses Metallic Glass View the complete course at: ocw.mit.edu License: Creative Commons BY-NC-SA More information at ocw.mit.edu More courses at ocw.mit.edu
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Lec 22 | MIT 3.091SC Introduction to Solid State Chemistry, Fall 2010 Lecture 22: Engineering Glass Properties; Introduction to Kinetics Instructor: Donald Sadoway View the complete course: ocw.mit.edu License: Creative Commons BY-NC-SA More information at ocw.mit.edu More courses at ocw.mit.edu
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 from a local welding store. Most of the cost is in the cylinder itself, since a refill costs only $20 to $30. You may find a welding supply shop that will rent the cylinder. Getting the TMOS is difficult since chemical suppliers are generally unwilling to sell to individuals. The process to make aerogel is 1. Mix TMOS, methanol, and ammonium hydroxide. Pour this mixture into molds, and wait for a gel to form. 2. Submerge the gel in methanol, and wait a day for the remaining water in the gel to diffuse into the methanol. 3. Discard the methanol, and replace with fresh methanol. Wait a day, and repeat. Repeat this process a few times over three days. 4. Transfer the gel into the supercritical drying chamber, and fill the chamber with methanol. 5. Add liquid CO2, then open the chamber's bottom valve to remove the methanol. Make sure the gels are always covered with liquid CO2. 6. Wait a day for methanol to diffuse into the liquid CO2. 7. Open the bottom valve and remove more methanol. 8. Repeat the ...
fayalite.avi This video shows the fayalite (ferrous orthosilicate Fe2SiO4)-water interface from a molecular dynamics simulation with a water model capable of breaking up into OH- and H+ ions. This is in the early stages of hydroxylation, representing about 0.25 nanoseconds of real time. Silicons are blue, oxygens are red, protons are white and irons are brown. Solvent waters are rendered partially transparent. Note that waters in the hydration layer are becoming incorporated into the olivine. made with VMD
Forsterite Powder / Synthetic Forsterite / Natural Forsterite from Reade Forsterite is a stoichiometric Magnesium Orthosilicate utilized for applications requiring a high coefficient of thermal expansion. It is calcined and milled under controlled conditions and can be modified to meet priority specifications. It is a member of the Olivine Group.
Creating aerogel with supercritical methanol In previous videos, I used supercritical CO2 to dry my homemade aerogels. This time, I soaked the aerogel in methanol, then raised the temperature and pressure of the methanol itself to make it supercritical. This allows the gels to be dried without an additional solvent exchange into CO2. The downside is that it requires a chamber full of methanol at 460*F and over 1200 psi, which is a much bigger hazard than using CO2. The aerogels dried with methanol shrank less than the ones dried with CO2, but there was still a lot of cracking, and I have yet to create a high-quality monolith.