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

learn more… | top users | synonyms

2
votes
1answer
17 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?
10
votes
2answers
84 views
+150

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 ...
1
vote
1answer
21 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 ...
0
votes
2answers
17 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..
3
votes
1answer
118 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.
4
votes
1answer
22 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
votes
1answer
51 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?
0
votes
0answers
15 views

How do I obtain PDF/ICDD/JCPDS?

I'm having trouble finding JCPDS of a material. I'm specifically looking for Na-titanate.
5
votes
1answer
138 views

What's wool made of?

For example, silk is made of fibroin. But what's wool made of?
3
votes
0answers
35 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.
4
votes
1answer
45 views

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 ...
1
vote
0answers
26 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 ...
33
votes
7answers
8k 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 ...
1
vote
1answer
33 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: ...
3
votes
1answer
66 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.
2
votes
1answer
51 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)
1
vote
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.
0
votes
0answers
34 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) ...
1
vote
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 ...
0
votes
0answers
24 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 ...
1
vote
1answer
27 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 ...
0
votes
1answer
32 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.
4
votes
1answer
256 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 ...
3
votes
0answers
68 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. ...
2
votes
1answer
142 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
2
votes
2answers
211 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 ...
1
vote
1answer
79 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 ...
0
votes
0answers
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 ...
0
votes
1answer
87 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 ...
4
votes
1answer
104 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?
0
votes
1answer
45 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 ...
1
vote
1answer
61 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, ...
2
votes
1answer
174 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 ...
1
vote
1answer
121 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 ...
2
votes
2answers
100 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?
1
vote
1answer
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 ...
12
votes
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 ...
9
votes
2answers
627 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 ...
1
vote
1answer
34 views

OFET vs Traditional Transistors

What is the advance of OFET's (Organic Field effect transistors) over the traditional CMOS Transistors?
4
votes
1answer
49 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 ...
4
votes
1answer
253 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 ...
2
votes
0answers
74 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 ...
2
votes
1answer
427 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 ...
1
vote
1answer
57 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 ...
1
vote
1answer
176 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 ...
2
votes
2answers
444 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.
7
votes
1answer
677 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 ...
0
votes
0answers
22 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 ...
2
votes
1answer
53 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 ...
0
votes
1answer
48 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 ...