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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152 views

Conductivity of Wüstite

"Wüstite is often represented as $\ce{Fe_{1-x}O}$, where $x$ is some small fraction less than unity. In this nonstoichiometric $\ce{Fe_{1-x}O}$ material conduction is electronic and the material ...
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349 views

What material should I mix with graphite to make a brick?

I want to make flake graphite into a brick but I don't know what material will work best. Would mixing it with clay work?
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4k 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
87 views

Why n-alkanes can be found in organic solvent extract of rubber?

Sorry for the confusing title, I didn't know how to describe this better. So, if we douse rubber, say, a bicycle tire or a certain type of rubber glove, with organic solvent (n-heptane), we can find n-...
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1answer
978 views

Neutralization of Sodium Azide using Ammonium Cerium Nitrate

I'm using Ammonium Cerium Nitrate to neutralize phosphate-buffered saline solutions containing 0.1% Sodium Azide. I add 0.55 grams of Ammonium Cerium Nitrate into 100 mL of this 1XPBS + 0.1% NaN3 ...
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1answer
133 views

Knowing about Sensor Film Kit

I am very new to this site and this is my first ever question. I want to know what is this black material in this sensor film kit. I am creating a weight sensor by using this very sensor kit. Now I am ...
2
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1answer
84 views

How do polymer properties change when moving from bulk to nanosized fibers?

Polymer are used in many applications, but how do the properties change when they are fabricated on the nanolevel? Im especially interested in polymeric and polymer derived nanofibers, and why they ...
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1answer
136 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?
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70 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
150 views

Do the compounds NaₓIrO₂ and NaOsO₂ exist?

Based on some physics background, I want to know whether have scientists synthesized these two materials: $\ce{Na_{$x$}IrO2}$ and $\ce{NaOsO2}$ in the lab, if so, what properties do they have? I ...
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138 views

Does alumina become transparent at high temperatures?

Consider a normal opaque alumina crucible. I've heard that they become transparent at higher temperatures and therefore, are not appropriate for high precision DSC (caloric) measurements. The reason ...
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1answer
59 views

What does it mean for a higher glass transition temperature in terms of crystallinity?

The glass transition temperature is associated with amorphous regions in a polymer. If I have observed in a lab experiment that polymers with a higher glass transition temperature tend to have less ...
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2k views

Effect of sodium hydroxide solution on copper plate

I have a copper etching plate that has over 100 years of dried ink in the lines of the plate. Someone suggested flake sodium hydroxide as a possible solvent for the ink. My concern is preventing ...
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1answer
104 views

Hair Gel Derivative

I need a water-soluble, extremely fast drying adhesive gel. My first thought is hair gel. pros: Water Soluble (easily removed)*** most important High viscosity in liquid form ~60 cps Easily ...
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1answer
212 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 ...
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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 ...
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1answer
71 views

Replacement for optical calcite (Glan Thompson prism)?

I notice that Glan Thompson prisms seem to be the preferred optics for doing polarimetry and have been for at least 75 years. One instrument maker says that polaroid films can be used but they tend to ...
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1answer
251 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 ...
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18 views

Non-conducting substance with a glass transition temperature around 400 to 600 °C?

Am looking for a substance to seel two pieces of ceramic that will have molten plastics flowing between at 300+ °C however silver solder circuit traces inside the device prevent me from going much ...
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46 views

C60 Fullerene Polymers?

Upon scouring Wikipedia for info about fullerenes to research, I came across this paragraph in the page on Buckminsterfullerene (C60): Under high pressure and temperature, repeated [2+2] ...
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53 views

Why upon melting of PEO between crossed polars colours appear?

Crystalline PEO when under crossed polars shows distinct Maltese cross pattern. Being birefringent, when polymer crystal align with the polarizer or analyser it shows extinction regions (effect known ...
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25 views

Platinum-carbon calayst in autoclave

Is it safe to treat platinum-carbon catalyst in an autoclave at 200 °C for 24 h in inert (nitrogen) atmosphere? If no, can you suggest safety measures?
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48 views

Which transparent plastic to use for electrolysis of dilute sulphuric acid

I plan to do an experiment which involves the electrolysis of dilute sulfuric acid (1 M or 1 mol/L). I would like to carry it out in a long transparent plastic container (easier to handle and clean). ...
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160 views

Which material are piezoelectric buzzers made of?

Which material are these buzzers made of? Does it depend on the manufacturer or they all are made of the same material? The Wikipedia page does not say anything about the material. I found some ...
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38 views

How can we conduct reactions for insoluble materials?

I am working on metal organic polydehra topic to synthesize new metal-organic cages or other based frameworks. I want to conduct postsynthetic modification for one cage, but the solubility is very ...
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29 views

Where can I look for a short chain photopolymer?

I am by no means an expert in this field, so please be patient with my explanation. I am looking for a photopolymer with very specific properties. I am not sure how realistic it is to find such a ...
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24 views

Study long term properties of two polymers

This is a material-science question, and I didn't know where else to put it. I (and two others) are mechanical engineering students and are starting a bachelor's thesis which involves some material ...
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710 views

How can I extract cellulose in plants using acids?

Me and my classmates are doing a research project about the extraction of nano cellulose from plants to form a biocomposite, which can be a material to form an effective biodegradable material. We've ...
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26 views

Accurate way to tell a material is PP with easily available means? [closed]

Sometimes even though certain products that I bought come with a "PP 5" marking on it, I suspect it may not be the case, so I wanna know, is there a relatively safe and accurate way to tell if certain ...
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51 views

Greek letters in front of inorganic/mineral formulas [duplicate]

What do Greek letters in front of the formulas for minerals/inorganic compounds mean, such as $\gamma\textit{-}\ce{Al2O3}$ or $\alpha\textit{-}\ce{Fe2O3}$?
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2k views

How does black CuO impart a green color to glazes and glass?

I read from a source that cupric oxide (CuO) imparts green to blue colour to glazes and glass. But CuO is black in colour. How is this possible?
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81 views

What kind of building materials could be synthesised from basalt? [closed]

Building tall cities is made possible by the invention of concrete with steel rebar which has much more tensile strength than any other massively available material that I am aware of. Cement (the ...
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2k views

Density of Interstitial compounds

I have read in my textbook (not very reliable) that density of interstitial compounds is lesser than parent compound. But how can this be true? We add atoms to the lattice voids, so density should ...
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96 views

A surface with variable roughness

As you may know, wettability is a characteristic of each surface which determines what the contact angle would be when a droplet is put on the surface (see here for more info). Surface roughness has a ...
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99 views

Composition of carbon rods in alkaline batteries

The carbon rods in batteries look somewhat similar to graphite, but they do not leave a significant mark on paper. What form of carbon are they? Are they simply just graphite with a large amount of ...
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117 views

“Synthetic wood” from cellulose and lignin?

Is there any research into making wood from its constituents? From what I know, wood is composed of cellulose, hemicellulose, and lignin. We can extract these from raw wood, but is there any way we ...
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55 views

Behaviour of oleophobic and hydrophobic object in an oil and water solution

I am wondering what would happen if I put a small (between $\mathrm{5mm}$ and $\mathrm{1\mu}$, density between $\mathrm{1}$ and $\mathrm{2\: g/mL}$) item with both oleophobic and hydrophobic ...
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96 views

How to minimize surface adsorption by choice of material?

I need to do buoyancy experiments in vapours consisting of organic molecules in air using a microbalance. This involves measuring the change in weight of a sealed glass sphere when exposed to the gas. ...
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0answers
32 views

Is there a specific chemical property or concept that explains/predicts the triboelectric series?

Is there a chemical property (perhaps electron affinity?) that can be used to predict where a substance would fall in a triboelectric series such as this one? Or would the cause of the charge ...
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0answers
163 views

Fermi Level of an alloy

How could one calculate the Fermi level of a copper-nickel alloy? They are both structurally face-centered cubic, however how would this structure affect the Fermi level of the individual atom or the ...
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0answers
86 views

How to distinguish open-pored polymer foam and foam with closed pores?

I was looking at two foam materials, where I had expected one to have closed pores. Unfourtunately, the microscope was showing the upper layer of cut cells the same in both cases with no indication ...
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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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0answers
226 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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0answers
387 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. ...
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794 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
131 views

Suitable coating material for protection of sensors

I'm building a moisture/temperature sensor for outdoor use in soil. It uses capacitive sensing for moisture and an NTC thermistor for the temperature. It's going to be used for vegetables so food ...
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1answer
233 views

Why is the maximum % for a gold alloy 92%?

The assignment question is asking us to explain why you can't get more than 92% gold in a gold alloy, and I can't seem to find out why it's specifically 92% in either the textbook or online. Any ...
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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 ...
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127 views

Is “density per unit volume” something?

I was reading articles on the preparation of shellac-based composites when I encountered the following statement (in ref. 1): Wood flour and fibres are interesting because of their low cost, good ...
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76 views

Substances that pass visible light but absorb microwaves

Specifically, the substances should be water-miscible or water-soluble, but not water itself. Additionally, they should be absorptive but not opaque.

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