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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Reason behind colour change of indicators [duplicate]

We know that for testing acids and bases we use the indicators. For eg. Acid turns blue litmus red and base has no effect on the blue litmus. Similarly colours are also seen in phenolphthalein, methyl ...
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Material selection based on minimum contact area and maximum bearing load

I need to find a good material to manufacture japanese knives' blades with Granta Edupack (former CES). I found a very usefull source about material selection in mechanical design which claims I have ...
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How to use a Nafion sheet Proton Exchange Membrane PEM

I am trying to use a Nafion PEM in a fuel cell configuration. Previously, I was taught to drop a little bit of Nafion solution on the membrane and heat press it between the electrodes. Why do we need ...
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1 answer
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How to find out by what method the steel was made, having a microstructure?

I know that rolled steel will have grains elongated in the rolling direction and I don't see anything similar in the microstructures of these steels. If I'm not mistaken, then the irregular boundaries ...
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How do I keep my homemade liquid fabric softener from separating?

I have a recipe for a homemade liquid fabric softener that smells good and works great, but I have to shake it every time before I use it. It gets old fast. The recipe calls for: 12 cups hot water, ...
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14 votes
6 answers
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What easily accessible material has melting point between 500 °C and 590 °C?

Is there an available at home material with the melting point between 500 °C and 590 °C? Plastics usually melt below 400 °C. Tin and lead also below that. Aluminum is melting above 600 °C. I made a ...
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Is there a stretchable, transparent polymer like PDMS, but not so hydrophobic?

I'm looking for something like PDMS, but not as hydrophobic. I'm trying to form 2d crystals using the surface tension of an evaporating droplet to organize microspheres into an ordered array. PDMS ...
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1 answer
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Solid materials with dipolar molecules

I am trying to heat solids using controlled microwave radiation and I am therefore looking for materials that absorb microwaves well. I have understood that for radiation in the radio frequency and ...
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Can a vacuum on a closed system really “pull” things out of it?

So I’m learning gas discharge tube making (neon) and there’s a step where you cork one end of the tube and pull a vacuum on the other end to suck out all the impurities. The same thing was done when I ...
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1 answer
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Aluminum Alloy with most alkaline resistance [closed]

Previously i asked this question in Engineering SE: What aluminum grade is the most resistant to corrosion in alkaline environment? Some input from others seem indicating that no mass-produced ...
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6 votes
3 answers
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What material properties are unpredictable (not reproducible) but can be measured consistently and at a low cost?

I'm looking for a process to create a material which has some easy to measure properties. These properties should be consistent over a long period. It should be very hard (expensive) to predict/...
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How to determine the visual properties of a specific steel compound?

The material that is described in a paper by Li et. al.[1] is interesting to me, but they don't go into any details on what the end result would look like visually. Out of curiosity, I was wondering ...
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7 votes
4 answers
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Why use diamond-like carbon instead of diamond?

Diamond-like carbon is an amorphous form of carbon, made of many small crystallites, mixing up the polytypes of diamond (most commonly the cubic lattice diamond, but also its lonsdaleite polytype with ...
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Is this plastic clip made of polypropylene or polyethylene?

I am trying to re-attach an automotive clip (painted plastic with a yellow (epoxy?) hard adhesive backing) which secures a trim piece back onto the vehicle's roof sheet metal (unpainted (primed?) area)...
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How to prevent hydrogen embrittlement in SmCo magnet?

We have a measuring apparatus that incorporates a samarium-cobalt (SmCo) magnet. Normally this is exposed to various gases under test. However, a problem has arisen with hydrogen, namely the magnet ...
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CVD MoS2 always get many particles/stuff on the surface, what is problem?

The $\ce{MoO3}$ and $\ce{SiO2}$ substrate is placed in the center of furnace and sulfur boat is in the upstream out of the furnace. In a general growth: $\approx \pu{2 mg}$ $\ce{MoO3}$ and $\approx \...
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6 votes
1 answer
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What is the maximum amount of carbon atoms that can comprise a fullerene?

As the fullerene sum formula can be defined as $\ce{C_n}$ with $n$ being any even integer number, is there any fundamental theoretical limit as to how big $n$ can get? If there is no limit to the ...
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1 answer
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Transparent material used in the movie Metropolis

This is probably a rather unusual question for this forum. The review of the movie Metropolis (made in 1926) by Roger Ebert shows what I assume is a still frame from the movie: The shield looks very ...
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3 votes
1 answer
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How are Silanol groups functionalized unto mesoporous silica structures?

As described in this research paper: Immobilization of Jacobsen type catalysts on modified silica, Jairo Cubillos , Edwing Grajales, Santiago Vásquez, Consuelo Montes de Correa, Rev. Fac. Ing. Univ. ...
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How do dielectric molecules in a liquid phase align when polarized?

As seen in the diagram, when a dielectric material becomes electrically polarized, the molecules align themselves in a manner where the respective charges are parallel to each other horizontally. ...
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2 votes
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Do contiguous monolayer aromatic structures retain the same magnetic susceptibility as the core constituents?

As the synthesis of Porphyrin monolayer strips is achievable, retaining the core aromaticity of the tetrapyrrole; does it still retain the same value of magnetic susceptibility of porphyrin? Does this ...
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1 vote
2 answers
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Reference request: book that covers an overview of useful materials

I was wondering if there is a book that has a broad coverage of inorganic materials, like concrete, glass, and steel. Ideally the book would go into how each material is manufactured and some of the ...
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1 answer
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Why don't carbon nanotubes behave like quantum dots?

If carbon nanotubes (CNTs) have the size required to have an bound electron energy state, why don't CNTs behave like quantum dots, such as having optical tunability, amongst other properties?
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2 votes
1 answer
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How would I go about developing a linker molecule that binds SiO2?

I'm trying to develop a molecule that acts as a bridge between a protein and surface of SiO2 lattice. The end that binds the protein is simple and easy but I can't figure out a way to draft up how I ...
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Are oxides of sulphur and carbon adsorbed into limestone/marble?

Oxides of sulphur and carbon are commonly present in the atmostphere in areas close to industries, can such oxides get adsorbed into the surface of limestone and marble and cause discolouration and ...
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3 votes
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Action of Fuller's Earth on Marble and Limestone

Using Fuller's earth is a very common and harmless way to treat marble and limestone that has been damaged/corroded by atmostpheric pollutants such as PM2.5/PM10 carbon particles (Soot) , Oxides of ...
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1 vote
2 answers
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Are states of matter distinguishable clearly? [duplicate]

Can we say a state of a matter is exactly only one of solid, liquid or gas? Can't we say something is more "liquid-like" or less "solid-like?" What is a state of slime?
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What is the power density of graphite user the Wigner effect?

The energy that graphite released upon a cascade of defects by neutron radiation is 2.7 MJ/Kg, however there is no data on how quick this energy is released. I am interested in this as this not ...
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1 vote
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Passivation of metals in acids

It is commonly taught in chemistry textbooks that metals such as $\ce{Fe, Al, Cr}$ is "passivated" in cold concentrated $\ce{H2SO4}$ and $\ce{HNO3}$ due to them forming oxide films on the ...
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Are ekaconjugated polymers used as dielectrics? If not, why so?

So I came across an article called "Giant polarization in high polymers" and I was wondering if there was a reason why these types of polymers haven't found use in capacitors at this point. ...
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Nanocomposite hydrogel for wet adehsion in biomedical applications

My name‘s Tristan and I‘m a bachelor‘s student in Germany. I‘m trying to synthesize an injectable nanocomposite hydrogel for wound closure and wound healing applications. The problem is that, next to ...
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1 vote
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X-ray Diffraction Lattice Spacing

I have crystal structure data which I have indexed. I am able to index the (010) (100) (011) (110) and (111) planes. Is there a straightforward method to calculate the a,b,c lattice constants based ...
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-5 votes
1 answer
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How are Quantum Dot molecules formed and what properties do they hold apart differently from singular quantum dots? [closed]

I am trying to understand the science and phenomena behind the function and operation of quantum dot molecules, but the only articles I run into talk about the synthesis of them. Could this be ...
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3 votes
0 answers
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How does the surface to volume ratio of ions and their distribution in solution compare to that of suspended nanoparticles in nanofluids?

I am interested in understanding the heat transfer capabilities of fluids. Nano-fluids are suspensions of nanoparticles (1-100nm sized particles) in a base fluid, often water, oil or glycol. These ...
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1 vote
1 answer
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Hair styling gels and 'liquid gels' - effect of formulation / composition on viscosity and performance [closed]

[Disclaimer: I am aware that this is a very 'first-world problem', 'light-hearted' kind of question, given the health crisis we are still going through. Just to avoid offending anyone, here's an easy ...
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-3 votes
1 answer
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Is is potentially harmful to have a vitreous-enamel item in a small poorly-ventilated room? [closed]

I am planning to purchase two enamel photo-frames for a room in the attic which is short in height and not well-ventilated. I would like to know if enamel like that is subject to deterioration that ...
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-1 votes
1 answer
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How many CO2 is emitted (in kg) by using 1 m3 of LNG? [closed]

How much CO2 in kg is emitted by using 1 cubic meter of LNG? It is used for a dry booth after painting products. Unfortunately, this is all information I have. Please note the assumptions for ...
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2 votes
0 answers
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Differing number average molecular weight results for 1HNMR, MALDI and GPC of a polymer

I have been given 1HNMR, MALDI-ToF-MS and GPC spectra for a laboratory synthesized sample of polycaprolactone. The number average molecular weight (Mn) obtained from their analysis differed ...
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1 vote
1 answer
807 views

Are the particles of a colloid "solid"?

I want to understand what are the particles of a colloid in the microscopic scale. According to Wikipedia: A colloid is a phase separated mixture in which one substance of microscopically dispersed ...
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1 answer
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Compound with pressure sensitive melting point at moderate temperature and pressure

I'm in need for a compound with ideally all of the following properties: A melting point of 5 °C or less at 1 atmosphere (or slightly lower pressure) A melting point of 12 °C or more at less than 20 ...
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1 vote
1 answer
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Exactly how the subscripted numbers are given to the different types of boron sheets (borophenes)?

I was going to start a project on Borophene, and hence I was going through a review journal, 2D Boron: Boraphene, Borophene, Boronene, where they have said many types of borophenes had been proposed. ...
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How is ECR (Electron Counting Rule) done in a structure?

I've been told how to apply the ECR to GaAs{001}(2×4) in my lectures but it makes no sense to me and I don't seem to be able to find any other sources that explain this. (This is a further question on ...
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1 vote
1 answer
50 views

Properties of inconel [closed]

I am doing a project on the physics of the spaceX raptor engine. I believe it is made out of a certain type of inconel alloy. I want to understand why this alloy has the properties that it does, but I ...
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2 votes
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Is mixing silicone oil with other types of oil safe?

I'm looking to lubricate some nylon gears in a servo motor, and online sources tell me silicone lubricants are one of the best ways to go. However, when I opened up the servo, I found that it already ...
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What is the viscous component in viscoelastic materials? [duplicate]

All real solid materials are in certain way viscoelastic, because an ideal fully elastic material doesn't exist as well as a fully viscous solid material. According to rheologic models it is possible ...
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1 vote
1 answer
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What is meant by "basis" in "... its basis in particles leads to a material comprising crystallites or grains tightly bound together, ..."?

I am currently studying Ultrasonic transducers – Materials and design for sensors, actuators and medical applications by Kentaro Nakamura. In chapter 1.2.1 Ferroelectricity, the author says the ...
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Could someone advise me on sources for crystallography and surface sciences?

I'm a physicist learning crystallography and surface science on the side of my research and I came across the concepts: surface reconstruction in hexagonal materials, unit mesh of surfaces, etc. I was ...
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1 vote
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Material Properties Dealing with "Wetting"

I am designing a rain device, and I am interested in a set of common metrics / standards for determining how something gets "wet". (1) Is there a "water absorbance" metric for ...
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0 votes
1 answer
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Nature of materials [closed]

Many a time I become confused when materials (and substances) are described with the following words: granular, crystalline, pellet. Worse still, the same material can be described with a combination ...
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8 votes
1 answer
2k views

What is the optimal voltage for storing a 3.7 V lithium polymer battery?

According to this website, storing a lithium polymer (LiPo) battery/cell at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% ...
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