Questions tagged [amorphous-solids]

An amorphous solid is a condensed matter system with the mechanical properties of a solid, but lacking the long-range order characteristic of crystals. Examples of amorphous solids are glasses and gels.

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Solids are crystalline or amorphous. Where do polymers fit in?

Traditionally, solids are classified as being either crystalline (well-ordered, periodic lattice structure at large spatial scales) or amorphous (disordered structure). A well-ordered polymer is a ...
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My candle is growing living crystals

My candle had no wick left, so I put the jar on a coffee warmer to melt the wax and release the scent. It worked great, the house smelled good. Then I forgot about it. 2 days went by and I just ...
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Can amorphous solids have energy bands?

One can understand the formation of energy bands from the Kronig-Penny model which assumes a periodic potential. But I heard that even if the potential is aperiodic, for example in amorphous ...
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Why the first peak in the X-ray diffraction of an amorphous solid has significantly high, in terms of intensity than the second peak?

In the XRD pattern of an amorphous solid we do not observe sharp peaks. Instead we see only diffused peaks. Why these peaks are diffused and more importantly why the first peak is significantly high ...
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Bragg scattering off an array of wiggly lines

I'm currently working through some problems in Chaiken and Lubensky and I found that my understanding of scattering theory is weaker than I thought. So I could use a sanity check on this problem ...
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A metallic container when hammered deforms but a wine glass when falls or hammered breaks. Why?

A wine glass breaks when it falls from hand or is hammered. But when a metallic object (say, a container) is hammered, it only deforms without breaking. Why? Is it somehow related to the fact that ...
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How are sand blocks formed?

My son asked me at the beach how are "sand stones" formed. These are the solid (but fragile) sand conglomerates which you can hold in your hand and which crumble to sand once pressed. I tried some ...
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Is there an upper limit on the band-gap of insulators?

From the tight-binding picture of insulators, the band-gaps arise from the intrinsic energy differences between atomic orbitals energy levels. The largest I have found so far is roughly 10eV (...
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What is glass: amorphous solid or supercooled liquid?

I have read glass is amorphous solid and also supercooled liquid. I know that all solids are frozen liquids. But is it fair to say that everything which is an amorphous solid is also a supercooled ...
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Demystifying jamming in many-body systems

From a theoretical point of view, what has been the most successful approach to understanding jamming phenomena? I understand there's still a lot of debate around this subject, namely whether a ...
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Non-glassy amorphous solids

According to Wikipedia: A glass is any "solid that possesses a non-crystalline (that is, amorphous) structure at the atomic scale and that exhibits a glass transition when heated towards the liquid ...
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Why is amorphous classified solid?

Because it does not have a crystal structure, it is hard to find physical similarities with a solid. Why isn't it then another state other than solid? The physics of amorphous is also quite different ...
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Why polymeric solids are said to be intermediate between crystalline solids and amorphous solids?

Crystalline solids have ordered arrangement and amorphous solids do not. Polymeric solids are simply formed by the joining of some monomeric units. It has nothing to do with ordered or not ordered ...
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What makes Obsidian edges sharper than other glass?

Obsidian is a volcanic glass with a reputation for being extremely sharp. Some surgeons use obsidian scalpels rather than high-quality steel surgical scalpels. At the same time, glass blades are used ...
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Is ice a type of glass?

It's kind of a tricky concept I assume, on one side you got those neat shared vertices of SiO2, on the other (water) you don't really have shared vertices, only kinda (but they still want to align ...
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Glass properties

This is a question about the properties and strength of glass. I know that glass is an amorphous solid but I am not sure if that is relevant to my question. My question is that if there's no physical ...
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Is glass a liquid?

I was told by a condensed matter physicist that glass is a liquid with a very high viscosity (it would be more precise to say that it is a supercooled liquid). The example given was that in cathedral ...
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nature of glass transition

I am reading in some book: "The glass transition is similar in appearance to a second-order phase transition, but it is not a true thermodynamic phase transition. This is because the transition ...
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Why does the d-spacing of a polymer decrease as its crystallinity increases?

I am currently investigating the annealing of a polymer (Parylene-C). In my reading I have found that when the polymer is annealed, there is a decrease in thickness of the film which results from a ...
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Do amorphous metals undergo conchoidal fracture?

Amorphous metals are often referred to as metallic glasses due to their quenched atomic disorder. Do they fracture in the same fashion as silicate glasses? If not, what failure mode(s) do they have?
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Phonons in non-crystalline media

Do sound waves in a gas consist of phonons? What about a glass? Or other non-crystalline materials such as quasicrystals? How does the lack of translational symmetry affect the quantization of the ...