How does the addition of Boric acid change Q1,Q2--- structure of silicate glass in the given figure below?
what are red balls and blue balls? label properly. Otherwise answer would be just guesswork.
I suspect blue balls are B or Si (with 3 or 4 atoms attached) and red balls O (2 atoms attached). More blue balls are attached with red balls as Q1Q2 becomes Q3Q4. This means either more B or Si are coming to be attched with otherwise incomplete-valency-from-one-side O atoms. This means more free tetrahedra and smaller tetrahedra chain are being linked to larger tetrahedra chains by addition of boric acid.
Now, boric acid has octate-deficient boron as well as hydroxyl groups. The hydroxyl groups (as well as water decomposion product as boric acid converts to metaboric acid HBO2) can act as network-breaker , or the octate deficient boron can accept some lone pairs of oxygen- acting as network former/modifier. The second case is likely happening here. While oxygen has valency of 2, it can be connected to more than 2 cations (as we can see in spinel structure, or H-tunnelable water ice structure). At lower concentration, the network-former role would be prominent, and at higher concentration, network-cutter role would be more prominent
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