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 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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21 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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7k views

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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30 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
55 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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1answer
44 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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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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30 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
30 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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23 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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22 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
29 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
208 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 ...
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62 views

What is the carbon footprint of a diamond?

I think it would be interesting and illuminating to calculate the carbon footprint (per carat) of diamond. The answer would undoubtedly be different for artificial (industrial grade) diamonds vs. ...
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1answer
107 views

New materials: What is D3O?

I am a phd student in materials engineering. Do you know D3O? I would know and study the chemical composition of this impact shock absorbing materials. Thanks for your answer
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2answers
139 views

Recrystallization and purification techniques for getting a pure sample

Could someone explain in detail as to why exactly recrystallization gives a more pure solid solid sample? As well as why is would be better 'technique' to allow for the crystal to form slowly? I was ...
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1answer
63 views

Enclathrated - definition?

When discussing the solvent uptake of a metal-organic framework would the correct term be "solvent molecules were enclathrated into the pores"? Despite searching for a definition online I have drawn a ...
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48 views

Is it dangerous to live near lead? [duplicate]

Several month ago, I soundproofed the door of my room with two sheets of lead. Can it be dangerous to live with them for many years? Can lead "decay" in some way and be inhaled? (and what happen when ...
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1answer
59 views

How to temper a non-ferrous metal

Can non-ferrous metals/alloys (copper, brass, bronze) be tempered (made harder) by temperature control alone, like ferrous metals? I understand it's simple to anneal copper, brass, etc., just by ...
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1answer
89 views

Is graphene chemically reactive?

I've been looking around, and found some sites saying it is, and some saying it's not. Can someone clarify this? If it's possible, can someone explain why it is (or not) chemically reactive?
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36 views

Carburizing Calculation

The problem is stated as follows: The surface of a steel gear made of 1022 steel (0.22 wt% C) is to be gas-carburized at $927$ °C. Calculate the time necessary to increase the carbon content to 0.30 ...
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51 views

Fick's Second Law of Diffusion

In the book "Foundations of Materials Science and Engineering" (Smith and Hashemi) the following is written: For cases of non-steady state diffusion in which diffusivity is independent of time, ...
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1answer
169 views

A semi-transparent material that is a solid

I am trying to find something I can get the ingredients for and make that starts out a liquid and sets into a solid. My end goal is to create a simple 8bit art figure so I want to pour it into a mold ...
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1answer
92 views

Why does gallium nitride allow an AESA radar to be more powerful than a radar with elements made of gallium arsenide?

AESA (Actively Electronically Scanned Array) radars use thousands of individual transmit/receive elements to create a radar. All in service AESAs use gallium arsenide as the material in the t/r ...
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2answers
82 views

Why do different impurities create different colors in diamonds?

Traces of nitrogen make diamonds yellow while traces of boron make them blue. What accounts for the differences in color for a given element?
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40 views

Which material to use for athletic accessories?

I'm looking for some guidance in selecting the right material for dance shoes heels and women's self-defense accessories. I'm looking for a material that 1) has a superb strength-to-weight ratio, can ...
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7answers
2k views

How to solidify sand

I'm doing a research project where we analyzing the structure of sand after a certain process. To get a better idea of the internal structure of the sand, we use different colors to visualize the ...
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2answers
519 views

Which is the densest gas known?

Which is the densest gas known to exist under normal "shirt sleeve" conditions: room temperature, one atmosphere, won't explode on contact with air, won't kill everyone in the building in trace ...
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28 views

OFET vs Traditional Transistors

What is the advance of OFET's (Organic Field effect transistors) over the traditional CMOS Transistors?
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46 views

Do dark lines on porcelain dishes indicate usage of aluminium for the color?

"I heard" that gray lines forming on porcelain indicate usage of aluminium in the coating. I would primarily like to verify this information. Bowl #1 and bowl #2 have been used both for several ...
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1answer
201 views

Length of copper wire in 1 lb spool

This is a homework question in my Hon. General Chemistry I class. Below this is the question, then below that is my work and answer explained as clearly as I could manage. Question: The diameter of ...
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68 views

Is superglue a good thermal insulator?

How good of a thermal insulator is superglue compared to other materials like ceramics, plastics, and metals? I know this might not seem like a chemistry question, but I was hoping someone here could ...
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1answer
422 views

What is cheap material that absorbs water in packaging?

I am thinking cheap material that can be used between two layers of carton that absorbs water. I want to use air but I still think that there may be other materials available that absorb water can ...
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1answer
55 views

How are chemistry and materials science related?

I'm currently a chemistry major and now I am considering doing a minor in materials science. Before making a decision, I would like to know how the two disciplines are related and what are their ...
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1answer
147 views

Photoelectric Effect in Semiconductors

Is the photoelectric effect possible for semiconductors? I imagine that this might be, if possible, a two-photon process: excitation of an electron from a filled to conductance band, and then on to ...
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2answers
292 views

What is the plastic material of the CD cases?

What is the material of which the transparent part of CD cases are made of? It is nicely rigid and really lightweight.
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643 views

What makes teflon such a strong material?

I don't know much about polymers but recently teflon made me get addicted to study their properties and nature. As far as I know, the teflon polymer contains fluorine which is one of the most ...
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20 views

Polymer Crystallinity

See the following question: I think the answer is A because of the hydrogen bond in the side group, thus the degree of secondary bonding between parallel chain segments is higher. Is my thinking ...
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1answer
42 views

What is relationship between molecular weight distribution of PE and its strength?

I'm trying to figure out the relationship between the molecular weight distribution of a polyethylene plastic and its strength and heat sealability. (The molecular weight distribution is described ...
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1answer
47 views

How do you perforate a teflon sheet?

I have a sheet of thin unperforated teflon that I need to perforate by tomorrow for a lab I work in. None of my coworkers know how to perforate the sheet. Does anyone know how I can do this using ...
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1answer
54 views

What is some advance reference books about alloy that gives a lot historical background and applies a lot of theoretical equation or formulas

What is some advance reference books specifically about alloy that gives a lot historical background and applies a lot of theoretical equation or formulas with explanation? I seem to find nothing ...
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25 views

TiO2 nanotube application in cement

I am perparing for a presentation on the application of TiO2 nanotubes in cement which is a recent topic in cement chemistry. Do you happen to have any papers (or know of any accessible on Internet) ...
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1answer
43 views

What type of material is this and how is it corroding?

So I was thinking about corrosion and I came across this structure(see image) Do you think the inner metal/alloy that is corroding is steel? Also, what do you think the outer layer (in white) is? ...
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1answer
14 views

What is the correct temperature probe for a wet etch solution?

What type of probe or probe coating should one use to measure the temperature of a roughly 100c aqueous solution of cupric chloride? A stainless steel probe seems incorrect. Is a Teflon coated probe ...
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44 views

Generally available fluid with good heat transport properties

I have designed a container which is heated up and has to heat up some tube-coils of water inside of it. This container is filled with a fluid that can help store and transfer the heat received from ...
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1answer
53 views

Is the end of a cigarette on fire when lit?

Is the end of a cigarette on fire when it is lit? Or is it smoldering? Is there a chemical difference between the two?
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126 views

Examples of electronically conductive foods?

There are many foodstuffs that are ionically conductive (for example, anything moist and salty). What about foods that have a high electronic conductivity? The only thing I can think of would be ...
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3answers
117 views

pH and materials selction

I working on the Navy study guide for their nuclear engineering programs and I am not a Chemist. Thus, I have come here to try and develop a better understanding of the subject matter. I am trying ...
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1answer
51 views

Change in pressure or volume of molten salt

I am doing a project in which I fill a cylinder with a volume of $636cm^2$ (made of stainless steel) with molten salt: 60% Sodium Nitrate ($NaNO_3$) and 40% Potassium Nitrate($KNO_3$). The container ...
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65 views

Vycor + hydrogen at 750°C - reduction?

Does anybody have experience with Vycor 96% silica tubing in hydrogen at bright red heat, around 750°C, regarding its reduction to silicon monoxide or elemental silicon?