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Questions tagged [glass]

This tag is for questions relating to glass materials and properties. DO NOT use this tag for questions about glassware.

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4 votes
0 answers
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How can glycerol make glass objects 'disappear'?

There's a famous experiment that uses glycerol (glycerin) to make glass objects 'disappear'. A glass object becomes nearly invisible when filled with glycerol and immersed in a container of the same ...
Nitrogen-8's user avatar
4 votes
0 answers
110 views

How to estimate the mobility constant and the surface energy parameter in the Cahn-Hilliard equation?

As a mathematician, I want to simulate phase separations with the Cahn-Hilliard equation $$ \frac{\partial c}{\partial t} = M \Delta \bigg(\frac{\partial \mu}{\partial c} - \kappa \Delta c \bigg), $$ ...
Henning's user avatar
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3 votes
0 answers
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Remove sticky PDMS from glasses slides

I prepared some PDMS mixing a Sylgard 186 (elastomer) and a curing agent with 10:1 ratio. I sucked all the bubbles and I sandwiched the PDMS between two glass slides to get flat surfaces. Finally I ...
Mickey Martini's user avatar
3 votes
0 answers
383 views

Does soda-lime glass contain carbon?

Soda-lime glass is made by melting together soda (sodium carbonate), lime (calcium oxide), dolomite (calcium magnesium carbonate), silica (silicon dioxide), alumina (aluminum oxide), and small ...
Metamorphic's user avatar
2 votes
0 answers
69 views

Diffusion vs mobility and the Einstein relation

This former question is about the mobility constant $M>0$ in the Cahn-Hilliard equation. To determine the value of such a mobility for a simulation study, Kim and Sanders (2020) use the formula $$ ...
Henning's user avatar
  • 193
2 votes
0 answers
92 views

Appropriate ways to remove aluminum from the surface of glass?

I'm looking for a way to treat the surface of borosilicate glassware such that it won't contaminate solutions of puriss reagents in conditions that pure $\ce{SiO2}$ wouldn't, yet keep the bulk ...
Hans's user avatar
  • 1,097
2 votes
0 answers
35 views

Non-conducting substance with a glass transition temperature around 400 to 600 °C?

Am looking for a substance to seel two pieces of ceramic that will have molten plastics flowing between at 300+ °C however silver solder circuit traces inside the device prevent me from going much ...
norlesh's user avatar
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2 votes
0 answers
227 views

Hexafluorosilicid acid attacks glass?

When HF meets glass, Hexafluorosilic acid is formed (assuming some water is present). It appears that Hexafluorosilic acid and further attack glass? How is this so, considering that all F atoms are "...
Kevin Kostlan's user avatar
1 vote
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49 views

Alkali-rich lead glass with working range at room temperature

I understand that the glass transition temperature (above which it is considered a super-cooled liquid) is quite far below the liquidus of the corresponding crystalline mixture. In the paper, "...
user145034's user avatar
1 vote
0 answers
62 views

Permanent water marks etched onto glass

We are noticing some permanent marks etched onto various glass parts we use in lighting products that cannot be removed. These appear regardless of the type of water (tap, DI etc. Our DI water is ...
nickc's user avatar
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1 vote
0 answers
69 views

Do Boron and Silicon form metallic-type bonds in alloys?

For context I am a physics student currently doing a project that involves metallic glasses. I am trying to figure out if you can get Ionic bonds inside an alloy with metalloids. More specifically, I ...
Disgusting's user avatar
1 vote
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72 views

Is the width of a Soxhlet Condenser Inherent to its Function?

Soxhlet extractors are often coupled to a specifically designed condenser with a very large lower joint. Is this inherent to it's function as a condenser in the apparatus or only because the Soxhlet ...
Hans's user avatar
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1 vote
0 answers
442 views

Copper Mirror Reaction

I would like to create a copper mirror on a plate of sandblasted glass. I know that a reaction exists: $$\ce{CuSO4 + N2H2 -> Cu + N2 + H2SO4}$$ I know that such a plate of copper is very weak. ...
Sean's user avatar
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1 vote
0 answers
62 views

Manufacturing coloured crystal glass using gold nanoparticles

I came across this video which shows how a crystal chandelier is made. I recommend that anyone reading this post should watch it; it is quite fascinating. Anyway, at about the 2:15 mark, the video ...
getafix's user avatar
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1 vote
0 answers
323 views

Why molten lithium burns through the glass but sodium not?

It's well-known in laboratory practice that one shouldn't melt lithium in a glass equipment and there isn't such rule about other alkali metals. You may damage the glass with sodium but lithium will ...
GilAlexander's user avatar
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68 views

How to define a chemical bond computationally?

I'm working with an amorphous system. With oxygen, my system has both covalent and ionic bond forming cations. I utilise the Wannier centre to define a covalent bond, and my theory is that if the ...
Raghvender's user avatar
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20 views

Does the process of chemically strengthening glass change its volume?

The process of chemically strengthening glass replaces sodium ions in the glass's surface with potassium ions through a process that uses a potassium nitrate bath solution. These potassium ions are ...
Kenneth Moore's user avatar
0 votes
0 answers
763 views

Highly concentrated NaOH solution at high temperature vs borosilicate glassware and cellulose?

I've read here on stack-exchange that NaOH will react with glass through the following reaction: 4 NaOH + SiO2 ⤑ Na4SiO4 + 2 H2O I would like to briefly heat a highly concentrated NaOH solution to ...
Hans's user avatar
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