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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244 views

Chemistry Self Education [closed]

I want to learn chemistry. I did not have the benefit of studying it when I was in highschool, and I was always intimidated by it (I feel it's more rote memorization rather than understanding - I'm ...
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4answers
319 views

Hard coating for soft surface

Say I have a soft, possibly porous object. I want to coat it with a material, Resistant to boiling water and some scraping Not hazardous, at least after the coating Largely transparent The idea is ...
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1answer
33 views

Can Ferrofluids vaporise to gaseous state and Condense back to liquid state and do it many times over? [closed]

Here is the Link for Ferrofluids for basic idea. After going through this Wiki link, probably many people will come to a conclusion like when Ferrofluid boils, its carrier liquid vaporises and nano ...
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1answer
468 views

Isotopic mass to density

I want to figure out/calculate the density ($\pu{g/cm3}$) of the various isotopes, here $\ce{^109Ag}$. I know it's isotopic mass is $\approx109$ and calculated the number of particles/gram. But I ...
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1answer
607 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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1answer
1k views

Is the photoelectric effect possible for 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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1answer
47 views

Liquid that burns in a vacuum [duplicate]

This may seem like a silly question, but is there a flammable liquid that could oxidise itself, so it could effectively burn in a vacuum?
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1answer
162 views

How to correctly mix solutions?

Imagine you have two ingredients - 45 grams of 60% ethanol, and as much water as you wish. The only accurate tool you have is a scale, which measuring error is up to $\pm \pu{1gram}$. How would you ...
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1answer
32 views

What is spatially and chemically heterogeneous materials?

Follow this paper, Structural analysis of humins formed in the Brønsted acid catalyzed dehydration of fructose They explained "humins are spatially and chemically heterogeneous materials." I found ...
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1answer
1k views

How does PEDOT:PSS work (mechanism) in Organic Electrochemical Transistors?

I have a question about the fairly fundamental theory behind the application of PEDOT:PSS in an organic electrochemical transistor (OECT) device. As at least I understand it, the ...
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1answer
155 views

Uncertainty in measuring the mass of the palm oil and the base in saponification

I am a student coming from the domain of mathematics, and I am working on error analysis and uncertainty, but I have a question in the domain of chemistry. I am studying the effect of the ...
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1answer
476 views

Hygroscopic material absorption level

I live in a high humidity location and every winter, mold forms on one of my walls due to water sticking on it during the cold times. This also ruins the paint. I found out that certain materials ...
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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 ...
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1answer
387 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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1answer
237 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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1answer
70 views

Suitability of liquid plastic resin for plumbing application

Which synthetic resins are suitable for fabrication of plumbing components e.g pipe sections? I'm trying to find an easy way to mold/house/encase a custom designed data logger. The water temperature ...
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1answer
41 views

Is it appropriate to call this material a hybrid composite? [closed]

The material I've synthesised is made up of two primary parts at a 1:1 ratio: Part 1: agar, glycerol, water. Part 2: polyurethane resin. The agar mixture on its own was too soft, so I added the ...
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2answers
74 views

Materials used in cooktop heating element, and reason for black appearance

I have been interested in the structure of heating elements/coils used in cooktops. I am referring to something such as in the following picture: I have a cooktop at home with such elements, and at ...
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1answer
152 views

Can I use pure zirconium as an anode in electrolysis?

I read that zirconium is not very reactive even when supplied with a current in an electrolyte. If I had a sizable piece of it, can I use it to perform electrolysis for rust removal of items? Would it ...
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1answer
41 views

What material most closely resembles/emulates dog's excrements? [closed]

Please get me right - this is no joke! Our engineering team has a terrible contract - we need to find a way to get height from which some dog excrements were dropped judging by what was found on ...
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1answer
493 views

How does an additive like aluminum oxide make a material like polyurethane harder/more resistant to wear?

I have wood flooring which is coated with a polyurethane finish. According to the marketing, aluminum oxide has been incorporated into the polyurethane to make it more durable, but that's all that is ...
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1answer
64 views

What is the phase transformation temperature anatase to rutile phase in tin dioxide(SnO2)?

Usually people discuss only pressure dependent phase transformations in case of either tin dioxide or titanium dioxide. It would be nice if someone gave the phase diagram for tin dioxide.
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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 ...
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1answer
121 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
726 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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2answers
651 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'...
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1answer
73 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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1answer
114 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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1answer
202 views

Rapidly cooling Aluminum vapour to solid state?

What sort of a microstructure would you get on bubbling Aluminium vapors through a large tank of Helium?Would it be a glassy microstructure and/or would you get nano-powders? and/or a new crystal ...
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1answer
62 views

Common flame-retardant plastic film materials?

More questions for my DIY hot air balloon: What are some very common (i.e. easy to purchase) plastic film materials that have very good flame-retardant properties? How is the "degree of flame ...
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0answers
43 views

What is the naming convention for Sn and Pb in inter-metallic compounds?

A hopefully quick question here: How would one go about naming inter-metallic (specifically Transition Post-transition) compounds containing tin and lead? It is usually easy figuring out the naming ...
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28 views

Semiconductor Li-ion batteries

I have recently come across the concept of semiconductor Li-ion batters, for instance carbonised polyacenic semiconductor (PAS) Li-doped materials. I am not sure how common it is for a battery to be ...
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1answer
24 views

Safe coating to make a 3D printed respirator mask airtight [closed]

What is a good example of something safe that could be applied as a coating layer to the walls of a 3D printed respirator mask to make them truly airtight (seal pores and fissures) while (ideally) ...
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0answers
27 views

What is the materials science behind thermal diffusion in multispectral camouflage?

I've been interested in infrared and near-infrared camouflage (called multispectral camouflage) for a couple of days now, and I've found a video or two of certain companies that have created fabrics ...
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0answers
26 views

How to get rid needle clogging on electrospinning of PLA/PCL/PMMA/Collagen?

For my thesis research, I dissolved PLA and PCL in chloroform: methanol (3:1), PMMA (350.000 MW, 13 wt%) in acetone, and collagen in acetate acid--and then, I mixed them together. The problem is when ...
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28 views

Gelifying hydrogen peroxide

What substances could be used to gelify 60% hydrogen peroxide? I imagine anything organic like agar would be broken down by the radicals. I tried looking up what dentists use and the only thing that ...
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0answers
37 views

Fick's second law atomic diffusion question [closed]

I have a question about diffusion and i'm not sure how to tackle it. A new processing method is being tried for a lithium battery cathode material -LiCoO2. the process leaves the ceramic oxygen ...
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1answer
673 views

Equation to find specific gravity (or density) from a solution of sugar and water

Is there an equation or simple way to calculate the final density of a solution made from x grams of sugar and y liters of water? And would it work in reverse? if we have y liters of water at z ...
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0answers
122 views

Long-term durability of linen vs polyamide vs polyester?

What is the comparative long-term durability of linen vs polyamide vs polyester when exposed to oxygen, but not sunlight? I assume that linen, polyamides (Nylon) and polyesters will all oxidize and ...
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0answers
58 views

PTFE-to-PTFE or PTFE-to-Copper pressure seal

I am currently working on an engineering project with a friend. Without giving too much away, I have two parallel strips of Zirconium-Copper alloy sandwiched between an upper and lower piece of smooth ...
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0answers
41 views

Is there a known crown ether analog to fullerenes?

It is well known that endohedral fullerenes have potential quantum computing applications example 1,example 2, and example 3. But, currently they are too expensive, around $167 million per gram at ...
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109 views

What material can be used as scraper in a chemical reactor?

I am having a 10L reactor built using SS316 for Plastic Pyrolysis. TEMPERATURE : 550C I would like a scraper to clean the char that forms on the reactor's inner layer. Teflon scraper is available ...
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0answers
36 views

Can such material exist? [closed]

Can a solid material exist, such that it shatters if you hit it lightly (with a solid object) but it deforms and doesn't shatter if you hit it hard (say with a hammer)?
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33 views

Extraction of Activated Carbon from Lignin

I'm currently working on a research project which involves the extraction of activated carbon from lignin. I'm already aware of the method of preparation using an alkali along with lignin products but ...
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0answers
26 views

Pseudocapacitive behavior in EC electrode materials [closed]

As we know in electrochemical capacitors or supercapacitors, the basic electrochemical signature is CV (cyclic voltammogram) curve. Some materials like $\ce{RuO2}$ and $\ce{MnO2}$ have a capacitive-...
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46 views

Is water the only substance that expands in both gaseous and solid states? [duplicate]

I have been told that water is the only substance that expands in both solid and gaseous states! Is this true? If not, what other substances can do this?
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34 views

What category do Gd3Fe2Fe3O12 belong?

After polishing my $\ce{GdFe2}$ sample with silicon carbide emery paper it developed trace amount of $\ce{Gd3Fe2Fe3O12}$ on the surface. Why is it being formed, are these type of compounds called ...
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75 views

Silicone with good thermal conductivity

I am looking for a material with the same properties of silicone (flexible, easy to manipulate, soft, etc.) but without being a thermal isolate. I need this material to do the junction between a ...
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27 views

What are the applications of poly-crystalline GdFe₂?

Poly-crystalline $\ce{GdFe2}$ is a ferromagnetic compound but where is it practically used for its magnetic properties?
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87 views

What would be a suitable non-combustible lubricating oil or compound for a very high pressure air compression system?

This question came up at Engineering SE but remains unanswered. If we are compressing regular air, not nitrogen, what oil or compound can be used that would not combust with the oxygen in the air. ...

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