Questions tagged [materials]

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

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24
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1answer
20k 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
70 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
263 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
211 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 ...
2
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1answer
62 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 ...
1
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1answer
92 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 ...
3
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0answers
330 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 ...
4
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1answer
313 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 ...
14
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1answer
4k 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 ...
3
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1answer
537 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 ...
2
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1answer
132 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?
17
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2answers
1k 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 ...
2
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1answer
247 views

Separation of metal particles from fluid in ferrofluid

I purchased commercial Ferrofluid, and when suspended, the water and/or alcohol turns into a brown sludge. In 95% alcohol, all the metal particles separated from the "tar" Why, and how can I prevent ...
1
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1answer
1k 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 ...
7
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2answers
1k views

Storing large quantities of KOH

I need to handle large quantities of $\ce{KOH}$; close to 1000 liters of 85 % conc $\ce{KOH}$ for about an hour. Any suggestions on how I go about doing it? Also the temperature during the process ...
0
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1answer
288 views

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

I want to know if there is any substance, liquid or any other stuff to separate ferrofluid from oil after mixing them.
5
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1answer
383 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
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1answer
888 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 spin-...
7
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1answer
13k 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?
5
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1answer
222 views

What's wool made of?

For example, silk is made of fibroin. But what's wool made of?
3
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0answers
1k 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.
7
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2answers
332 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 ...
2
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0answers
221 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 ...
90
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8answers
49k 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't say ...
2
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2answers
95 views

Looking for a chemical to calibrate a temperature sensor

The best method for calibration would be a bath filled with a chemical at its melting point with a solid/liquid composition. The constraints being that it must be hydrophobic and relatively non-...
5
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1answer
3k 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
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1answer
874 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.
3
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2answers
3k views

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

What type of material is used in the control rod of a nuclear reactor? (Nuclear power plant)
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2answers
5k 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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1answer
77 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 ...
1
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1answer
113 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
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1answer
146 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.
0
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1answer
4k views

Elasticity of latex

Latex is a natural resource and the elasticity can be increased by heating it with sulfur. My question is why they are have different elasticity than that of latex? I mean like rubber gloves have a ...
10
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1answer
11k 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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0answers
382 views

What is the carbon footprint of a diamond? [closed]

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. ...
9
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0answers
430 views

How to predict the type of intrinsic defect? [closed]

Intrinsic defects occur when a pure material crystal shows either vacancy or interstitialcy. When an ionic compound has vacancy, the imbalance in charge has to be compensated with another defect. When ...
6
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3answers
5k views

What new material is D3O?

I am a PhD student in materials engineering. What is D3O? It is not a chemical, but rather a "polyurethane energy-absorbing material" (from Wikipedia). I would wish to know and study the chemical ...
3
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2answers
7k 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 sample? As well as why is would be better 'technique' to allow for the crystal to form slowly? I was ...
1
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1answer
700 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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0answers
83 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 ...
2
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2answers
3k 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 ...
5
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1answer
2k views

Is graphene chemically reactive?

Different internet sources say different things. If possible, can someone explain why it is (or isn't) chemically reactive?
0
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1answer
3k 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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2answers
620 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, Fick'...
2
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1answer
950 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
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1answer
603 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
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2answers
1k 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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1answer
72 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 ...
21
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7answers
6k 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 ...
24
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3answers
12k 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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