Material is a general term for a chemical substance or a mixture of substances with certain, well defined physical properties.

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What determines the elastic limit of a substance?

from what I know, the elastic limit of a substance is the maximum amount of stress/force/pressure (a bit of confusion on my behalf here) a substance can withstand and still return to its original ...
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15 views

What role does carbon fiber reinforced polymer play in wing flex? [closed]

Could someone please explain how CFRP helps a wing flex (on a molecular level) so as to make clear some of its properties?
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1answer
30 views

How to calculate mass of nanomaterial grown on a substrate

I'm growing graphene on copper substrates and need to know the mass. The graphene is grown via chemical vapor deposition; amounts of reactants are not completely known. The best approach I've thought ...
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2answers
475 views

Why are so many ionic compounds brittle?

Even when ionic compounds are strong (e.g. rubies and sapphires), they are neither malleable nor ductile in the slightest, and if sufficient stress is put on them, they will shatter, not bend. Why is ...
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50 views

Palladium Nanocube

What is the relative permittivity and relative permeability of a palladium nanocube? If I change the size of this $\ce{Pd}$ nanocube, will these values be changed or remain the same?
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25 views

What is “Steel Reinforced Epoxy”

No, it's not epoxy for reinforcing steel. It's "steel reinforced epoxy." http://www.jbweld.com/products/j-b-weld-twin-tube How in the world does steel reinforce epoxy? I can understand how carbon ...
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1answer
32 views

How are piezoelectric crystals made?

I want to know how the powdered formed of piezoelectric material is converted to crystal like used in quartz watches. I know that some more chemicals are mixed with the material and then it is pressed ...
12
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1answer
160 views

What happens if a polymer's length is equal to its persistence length?

So, I've been looking into polymer chemistry to model breaking polymers for a biological model, and I've been a bit stumped by the concept of persistence length. I know that if a polymer is ...
2
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0answers
22 views

How to distinguish open-pored polymer foam and foam with closed pores?

I was looking at two foam materials, where I had expected one to have closed pores. Unfourtunately, the microscope was showing the upper layer of cut cells the same in both cases with no indication ...
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48 views

Will fire corrode stainless steel?

Thinking of making a stove out of stainless steel. Stainless because it will have a double outer jacket to pass water through and heat it. Will a wood fire sitting directly on stainless steel corrode ...
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1answer
129 views

Jahn-Teller Metal : The new state of matter

Recently it came in the news that scientists have discovered a new state of matter called Jahn-Teller metal. I tried reading up on it but couldn't understand it clearly. Please explain in simple ...
2
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0answers
42 views

change in state (sublimation and deposition)

I am slightly confused as to how Ii should think of changes in state (especially sublimation and deposition). Should I think of sublimation and deposition as skipping the liquid phase (fig 1) or ...
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1answer
33 views

Is there an otherwise liquid material that has angle of repose?

I wonder whether there is a material which consists from individual molecules (that is, fluid), which has its angle of repose thus exhibiting propertes of a powder?
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1answer
78 views

What is the world's finest powder substance?

What is the world's finest powder substance that has the smallest granules but remains solid?
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1answer
132 views

What chemical characteristics give types of steel their properties?

I am a mechanical engineer, and just like everyone else I had classes on the crystal structure of metals, phase diagrams, and the various heat treatments. However, even after diving back into that ...
9
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1answer
481 views

Why does sunlight cause colors to fade?

If you leave something outside, its colors seem to inevitably fade or bleach due to exposure. Is this due to UV absorption? What sort of mechanism causes this - is it that man-made dyes deform on a ...
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0answers
40 views

Is there a porous thin material that will cool a stream of air passed through it to an even cooler temperature on the other side?

Is there a porous thin material (e.g. filter paper, membrane) that will cool a stream of air passed through it to an even cooler temperature on the other side? If this material is absorbent, could ...
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1answer
51 views

Chemical compatibility of polycarbonate and carbonate esters

I am designing a battery box to house lithium ion batteries in an electric vehicle. These batteries use an electrolyte which probably contains carbonate esters (eg. ethylene carbonate, dimethyl ...
2
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1answer
54 views

What does “NADH (sodium salt)” mean?

From what I understand, NADH does not contain any sodium, so why is it being referred to as a sodium salt? Were sodium ions added to NADH? If so, why were they added? On a related note, why is its ...
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1answer
49 views

Interaction between metalic nanoparticles and aggregation

I can't find any publication to deal with aggregation of colloidal metalic nanoparticles. What type of interaction(s) is/are there between aqeous metalic nanoparticles which give(s) rise to ...
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1answer
48 views

What is the process or material that can enhance the conductivity of the graphene oxide?

I am doing a research and experiment on using Graphene oxide for deicing. My purpose is to coat graphene oxide on the surface of the ship in the north and south pole where large amount of large size ...
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0answers
17 views

transparent plate that hardened resin won't stick to

What kind of materials are there available that will be transparent (at least 80% light should pass through) for 365 nm UV that would not stick to hardened resin? I am building a 3D printer that ...
3
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0answers
62 views

Chemistry of Stripper Poles: How much weight can different materials support? [closed]

I'm looking to create a light up dancing pole. This requires a translucent material that is strong enough to support the weight and force of a human being, even when it's hollowed out to so LEDs can ...
2
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1answer
77 views

Why are 720 nm LEDs so uncommon?

Disclaimer: Potentially more of a physics question, but this area is muddy. I'm trying to find 720 nm LEDs but they're proving to be very uncommon. In fact, there seems to be a gap between 660 nm up ...
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1answer
114 views

How does epoxy stick to stuff?

According to Wikipedia what gives epoxy its holding power is apparently "ionic" interactions between the epoxy and the surface. But I thought that epoxy was overall neutral when cured. How can it ...
2
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1answer
52 views

How does “breathable” siloxane water sealant work?

(This is an interdisciplinary question, between molecular chemistry, materials science & construction. I think Chemistry SE is the right fit, but please move it if needed.) Silane/siloxane ...
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1answer
27 views

Etching a Screen Protector Film

I have to etch a pattern on a plastic film similar to the ones used to protect phone screens. I want a very thin etch, one that is only visible on close inspection. How can I get that done?
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137 views

Safety in handling of concentrated ammonium fluoride

I recently saw a protocol for extracting organic materials that are bound in the silica matrix formed by diatoms. The extraction protocol used 10 molar ammonium fluoride ($\ce{NH4F}$). I briefly ...
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1answer
48 views

Permanent Balloon?

Is it possible to create a container for helium that it can't permeate through, like a permanent balloon? Or, if not, what kind of material would have the lowest permeability for that application? I ...
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2answers
34 views

which method can be applied to separate ferrofluid liquid from oil?

I am 2nd year mechanical engineer student. Wanna know is there any substance,liquid or any other stuff to separate ferrofluid from oil after mixing them... Please give me answers..
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1answer
167 views

What does delta letter mean in some ceramics chemical material formula?

Here is a given chemical formula for ceramic material: La0.6Sr0.4Fe0.8Ni0.2O3-δ There is a letter δ. What does it stand for? I guess it is something about oxygen vacancies in crystal lattice.
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1answer
92 views

How to take water-dispersed PEDOT:PSS and disperse it in an organic solvent?

I am doing a science fair project on OLEDs. I am testing whether polypyrrole can be used as an emissive layer in a 2-layer OLED. The polypyrrole I am synthesizing is water soluble, and will be ...
4
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1answer
249 views

What type of organic compounds are used in OLED technology?

I know that there are organic compounds that exhibit electroluminescence, and are those types of materials difficult to synthesize?
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33 views

How do I obtain PDF/ICDD/JCPDS?

I'm having trouble finding JCPDS of a material. I'm specifically looking for Na-titanate.
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145 views

What's wool made of?

For example, silk is made of fibroin. But what's wool made of?
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71 views

What material is an Inkjet transparent printing film (slide) made of?

I don't mean photographic film/film base but rather the A4/Letter sheets of transparent film that were used in slide projectors during lectures. For example see this.
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What is Nano Zinc Oxide?

First of all, I have zero chemical background, but I seek for an easy explanation about Nano Zinc Oxide. I was told that the name of "Nano Zinc Oxide" couldn't possibly exist. Instead, it should be ...
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33 views

How paper-tag survive in the dry-cleaning process?

This prevent the clothes from being ruined by ink on the paper tag. To put the garments attached with this paper through the whole process of dry-cleaning, I have the questions listed below paper ...
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7answers
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Is toothpaste solid or liquid?

My teacher didn't answer this properly: Is toothpaste solid or liquid? You can't say toothpaste is a solid because solid material have a fixed shape but toothpaste doesn't. However, you can say ...
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1answer
109 views

How can concrete set underwater?

I'm about to teach concrete to some high school children. I'm not a chemist but as I understand it the limestone cycle is this: ...
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1answer
111 views

what would happen if you got a full package of wet silica gel on your hand after it tore open? [closed]

I accidently opened a bag of silica gel and got it on my hand what will happen to my hand because now it kinda feels weird.
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2answers
131 views

Nuclear power: what material is the control rod made from?

My question: What type of material is used in the control rod of a nuclear reactor? (Nuclear power plant)
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2answers
269 views

Are there two compound resins that tolerate over 1000°C for glass/carbon fiber?

I'm a hobby enthusiast that loves to play with electronics so my major is not in chemistry, there for I'm hoping that this forum is the right place to find aid in this question. I've searched day in ...
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0answers
23 views

What is the driving force for the growth of uniform size participates in a matrix?

What is the driving force for the growth of equal size participates in a matrix? For different size participates the concentration gradient between small and large particles is the driving force.
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45 views

short range order and long range order

what is the difference between short range order = 0 and long range order = 0 in disordered alloys? I just know the equation of SRO & LRO: SRD= (Pab-Pab random)/(Pab max-Pab random) ...
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1answer
40 views

Martensitic transformation in ceramics

What is the specification of Martensite (displacive) transformation in ceramics comparing to the metals? I just know about Martensite transformation in metals. For example, these transformations are ...
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26 views

coherent grain growth

What is the driving force for growth of coherent precipitates in the matrix? The driving force for growth of incoherent precipitates in the matrix is concentration slope between tiny and large ...
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1answer
33 views

How to study Sodium hypochlorite stability with materials

first of all I'm not not sure to be in the right stack exchange site, but I'm a material engineering student and this year I have a project: choose a material for a container filled with Sodium ...
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1answer
52 views

Can I change viscosity of an HDPE polymer?

I want to make composite with HDPE and wood, but when I melt it I have problem to mix them, because this polymer have high viscosity.
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1answer
755 views

Structure of carbon fiber

What is the structure of carbon fiber? Wikipedia doesn't give much insight. The atomic structure of carbon fiber is similar to that of graphite, consisting of sheets of carbon atoms (graphene ...