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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Is it safe to use borosilicate lab glass as an autoclave?
I'm attempting to do a one-pot synthesis that requires autoclaving the chemical mixture. I thought this process would be greatly simplified by using the lab glass itself as the autoclave in situ ...
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Why don't oils use plastic droppers?
As shown in the picture, most cosmetic oils and serums make use of glass droppers. However in the chemistry lab, scientists often also use reusable plastic droppers as well. My question was that, ...
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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 ...
user145192
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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, "...
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Can any compound form into an amorphous solid?
I am curious whether it is possible or not to make any solution of a specific compound into a crystal lattice or into an amorphous solid? I know that crystals form under specific conditions but seem ...
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Are there distinct phases of amorphous ice?
Amorphous ice is a solid phase of water that lacks crystal structure. It is stable below about 150K, above which it converts to crystalline ice.
There are four phases of amorphous ice: low medium, ...
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67
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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 ...
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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 ...
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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
$$
...
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How to estimate the mobility constant and the surface energy parameter in the Cahn-Hilliard equation?
As a mathematician, I want to simulate phase separations with the Cahn-Hilliard equation
$$
\frac{\partial c}{\partial t} = M \Delta \bigg(\frac{\partial \mu}{\partial c} - \kappa \Delta c \bigg),
$$
...
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Computing the molar volume for a 2D-simulation of phase separation
I am a mathematician and I want to simulate phase separation that occurs in a sodium silicate glass ($12.5\,\text{Na}_2\text{O}\cdot 87.5\,\text{SiO}_2$) at $T = 923\ \text{K}$ as it was done, for ...
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How to define a chemical bond computationally?
I'm working with an amorphous system. With oxygen, my system has both covalent and ionic bond forming cations. I utilise the Wannier centre to define a covalent bond, and my theory is that if the ...
1
vote
1
answer
195
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Understanding Cahn-Hilliard Equation in terms of Units
The Cahn-Hilliard equation may be formulated as
$$
\frac{\partial c}{\partial t} = M \nabla^2 \left(\frac{\partial \hat f}{\partial c}\right),
$$
where $c : \Omega \to [0,100]$ describes the ...
- 193
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Understanding the molar free energy to simulate phase separations (Na2O-SiO2)
I am a mathematician and I want to understand the molar free energy model given in Kim and Sanders (2020) Equation (1), that is,
\begin{equation}
f(c,T) = RT \big(c \log(c) + (1-c) \log(1-c)\big) + \...
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How should you report measurements and uncertainty for a measuring cylinder with 0.5 mL graduations?
I understand that a common convention is to report the uncertainty of an analogue instrument as plus or minus half of the smallest scale division.
By this logic, a measuring cylinder with $\pu{0.5 mL}$...
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