Sodium Silicate random network Flashcards

1
Q

What are bridging oxygens?

A

~ oxygens bonded to two Si4+ ions (between two SiO4(4-) tetrahedra)

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2
Q

What are non bridging oxygens?

A

~ oxygen anions ionically bond to Na+, don’t form a bridge between two Si4+ ions

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3
Q

What are network formers?

A

~ Si4+

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4
Q

What are network modifiers?

A

~ Na+
~ these ions cluster together
~ easily rearrange, transforms bridging oxygens into NBO
~ makes manufacturing easier
~ the glass will be fluid at a lower temp

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5
Q

What is a flux?

A

~ Na2O
~ substantially lowers melting temp of silica

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6
Q

Why is Na2O-SiO2 not used as a commercial glass?

A

~ the glass is water soluble
~ Na+ ion exchanges with water, everything falls apart

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