Questions tagged [carbon-allotropes]

This tag should be applied to questions about the various allotropes of carbon and their physical or chemical properties. Most important modifications are diamond, graphite, fullerenes, graphene and nanotubes.

Filter by
Sorted by
Tagged with
2
votes
0answers
31 views

What is the order of adding chemicals in Hummers method for graphite oxide?

I am trying to make graphene oxide but failing miserably. The XRD peak is at 24 (2θ) instead of being near 10. Raman shows correct g and d peaks but are not very sharp. The colour of the end product ...
1
vote
0answers
44 views

Why are Buckminsterfullerene (C60) solutions pink/purple?

A solution of Buckminsterfullerene $\ce{(C60)}$ is shown below: According to the April 8th Wikipedia page on Buckminsterfullerene $\ce{(C60)}$: Solutions of pure C60 have a deep purple color which ...
2
votes
0answers
47 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] ...
5
votes
1answer
376 views

How does acetone remove pencil marks?

In another question it was noted that acetone is a useful solvent for removing pencil marks from wood surfaces. (Source: https://woodworking.stackexchange.com/a/1870/763) I'm used to acetone being ...
1
vote
0answers
55 views

How is it possible to melt diamonds? [duplicate]

On another thread on this website it mentioned how it was possible to melt diamonds, but what would be the micro-level occur for that to happen. This question applies to Silicon Oxide aswell. They ...
0
votes
0answers
39 views

The structure of exploding buckminsterfullerene-nitrous oxide compounds

Recently, looking into structures of buckminsterfullerenes, I have found several articles claiming that attaching 12, or “several” nitrous oxide molecules to the buckminsterfullerene will cause it to ...
0
votes
0answers
21 views

Would graphene be a good efficient conductor of electricity in mobile phones [duplicate]

Gold is commonly used in mobile phones as an electrical conductor,as it is apparently better than copper at conducting electricity Quoting from extremetech.com : "The materials recovered are reused ...
0
votes
0answers
147 views

Is cyclo[18]carbon aromatic?

How does this compound even exist? Having such a massive ring strain. Is it even conjugated? As it's resonance structure will have all double bonds. Since it was reported to be found, there must be ...
0
votes
1answer
107 views

Is it possible to have an allotrope of carbon as a long unbranched chain of itself?

Is it possible to have an allotrope of carbon with formula $\ce{(=C=)_n}$? Well, let's actually leave alone the separate question like from which "monomer" would one produce such a thing (can one ...
0
votes
0answers
17 views

Carbon-Carbon Chain stabilities [duplicate]

While learning about Carbon and its Compounds in a class 10 coaching, I suggested a structure for some isomers. It contained a connection of two consecutive carbons connected by double bonds. The ...
2
votes
0answers
27 views

Does ordered mesoporous carbon (for example, CMK-3) contain aromatic rings?

I'm studying the article Synthesis of ordered mesoporous phenanthrenequinone-carbon via π-π interaction-dependent vapor pressure for rechargeable batteries, in which authors explain some properties of ...
19
votes
1answer
747 views

Why does the image of cyclo[18]carbon look like a nonagon?

The $\ce{C18}$ allotrope cyclocarbon has been synthesized and imaged.[1] Science has most details behind a paywall, but this discussion includes an image: In this octakaidecagonal molecule, each $\ce{...
2
votes
0answers
29 views

What is the approximate cost per unit length to synthesize carbon nanotubes free of defects? [closed]

As implied near the end of this article, carbon nanotube fibers have been synthesized in chunks on the order of about a centimeter in length (Fei Wei at Tsinghua University in 2018). What is the cost ...
1
vote
1answer
43 views

How hot will a carbon electrode get in an electrolysis setup?

For the electrolysis of sulfuric acid, I plan to use carbon graphite electrodes at voltages up to 6 V. I would like to know if my carbon electrodes would get considerably hot or warm (45 °C or higher)....
6
votes
1answer
84 views

What happens to the carbon in carbon steel when it rusts?

Carbon steel is iron containing some carbon in various forms of iron carbide. When it rusts (oxidises), the iron becomes part of all kinds of crystalline and amorphous iron oxides and hydroxides, ...
1
vote
1answer
54 views

What molecules are produced in carbon arc lamp and how do they produce light?

I am curious about the chemistry of the arc lamp (an indirectly for the incandescent bulbs) thus I would like to ask the following. It is a common understanding that the electrons pushed inside an ...
4
votes
1answer
156 views

Understanding lattice matching of graphene on silver (111) crystal surface and meaning of the √3 x √3 lattice?

Figure 1 in Ivor Lončarić and Vito Despoja, Phys. Rev. B 90, 075414 Benchmarking van der Waals functionals with noncontact RPA calculations on graphene-Ag(111) (available in Researchgate) shows a ...
12
votes
0answers
289 views

How is the aromaticity in graphene different from the aromaticity in benzene?

The web page Aromaticity in Graphene and other 2-D Systems begins: I. Graphene While the σ-bonding in graphene is assumed to be a rigid honeycomb framework built out of two-center two-electron (2c-2e)...
3
votes
1answer
84 views

Home-grown diamond using CVD

I want to make a diamond at home using chemical vapor deposition (CVD). If I use a metal chamber filled with methane and hydrogen gas and heated with a microwave oven oscillator element, will the ...
3
votes
0answers
54 views

Possibility of non-hexagonal graphene

I understand that monolayer carbon naturally forms in a regular hexagonal tiling. Is it, however, possible (if difficult) to form carbon monolayers of a different structure? A 3-12-12 tiling, for ...
6
votes
3answers
1k views

Why is graphite brittle?

Carbon exists in more than one allotropic forms, and the allotropes have different physical properties due to different arrangement of atoms. I am going to compare their hardness for now. Below is ...
0
votes
1answer
203 views

Why does diamond have no molecular formula?

Why does diamond have no molecular formula, while buckminsterfullerene does have it, despite both being allotropes of the same element?
5
votes
2answers
192 views

Aetiology of the word “fullerene” in Chemistry

I am a mathematician and not a chemist, and I am trying to understand the historical relationship and current usage of the word "fullerene" across Mathematics and Chemistry. I apologise in advance ...
2
votes
1answer
124 views

Do molecules containing only carbon exist?

Why doesnt carbon forms bonds with itself to form a molecule. Carbon shows the property of catenation then why doesnt it form a cyclic molecule as : ...
39
votes
4answers
17k views

Why can a diamond be broken using a hammer if it's the hardest natural substance known?

I've heard that diamond is the hardest natural known material but, on Google search, I found that it can easily be broken by a hammer as it's not tough. So, what is difference between hardness ...
1
vote
3answers
3k views

Calling Diamond an element?

Is it scientifically correct to call Diamond an element? Carbon has a wide range of allotropes, so would it be correct to actually just call graphite, diamond etc an element. For that matter, could we ...
3
votes
1answer
90 views

Why does it require so much pressure to create diamonds?

Why does it require so much energy/pressure to create diamonds, yet with silicon it is very easy and (I believe) naturally occurs in a "diamond" structure, i.e. where each atom is covalently bonded to ...
0
votes
1answer
2k views

Graphite: Thermal and electrical conductivity

I recently encounter this question: Compare, while providing an explanation, the thermal and electrical conductivity of graphite to that of diamond. Provided answer: Graphite conducts electricity(...
0
votes
0answers
15 views

How is the covalency of terminal carbons of a diamond satisfied? [duplicate]

Are the terminal carbons of the diamond lattice remain bonded to some element like hydrogen? Or, is it that they don't achieve octate in their outer shell?
2
votes
0answers
29 views

Existence of tesserane and it's properties

Could there exist an allotrope of carbon, $\ce{C16}$ where the overall shape of the molecule is a three dimensional representation of a tesseract? And what are its (predicted if unknown/unsynthesised) ...
2
votes
2answers
478 views

What dangers/risks are there in the production of carbon subnitride?

I was reading that carbon subnitride or Dicyanoacetylene has one of the hottest flames when used as a fuel, but it also is unstable and can explode easily into carbon powder (no specifics on cause). ...
1
vote
0answers
91 views

What would happen to a diamond in the presence of oxygen and elevated temperature and how fast?

Let's say I have a $\pu{1cm^3}$ diamond and I put it into an oven where the temperature is about $\pu{ 400°C}$. We all know that diamond oxidizes. Would it evaporate or turn into graphite? If so, ...
10
votes
2answers
4k views

Why do diamond and graphite have different structures, when they are both composed of carbon?

Both diamond and graphite are covalent networks and are both made entirely from carbon, but why does diamond have a three dimensional network of strong covalent bonds which makes it hard, whereas ...
2
votes
1answer
127 views

What causes the anti-siccative effect of soot (amorphous carbon) as a pigment in oil paints?

Oil paint containing carbon black (soot, charcoal) pigment is known to polymerize ("dry") a lot slower than if it has other pigments. I understand this is not just due to the absence of pigments which ...
3
votes
0answers
172 views

Is this a viable method for graphene production?

In a cup of warm water add sugar until it no longer dissolves then add a few spoonfuls more of sugar. Drop in a small amount of graphite powder into the sugar water mixture. Stir it up well. There ...
1
vote
0answers
34 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 ...
2
votes
1answer
69 views

Diamonds into protective barrier

Theoretically, is it possible to make a large, transparent piece of armor or a shield from a diamond? Say, a piece of the said armor with a size $7^\prime \times 7^\prime \times 6^{\prime\prime}$? ...
8
votes
2answers
1k views

How to tell between carbon powder or graphite powder?

I have a black powder that I cannot reliably tell just by looking or touching whether it is graphite powder or charcoal powder. Are there any simple tests that I can perform to tell whether it is one ...
3
votes
1answer
78 views

Other molecules like fullerenes?

When I first heard about buckminsterfullerene, I thought it was a very fascinating molecule, with its interesting complex ring structure and pseudo-symmetry. I wonder though, can you get similar ...
1
vote
1answer
113 views

How fast does the diamond lose the atoms at sunlight?

recently I've read that the diamonds lose their atoms at sunlight on the surface. Would you be able to explain me how fast is the rate of this process? Does the diamond lose the atoms each time when ...
0
votes
3answers
2k views

Is graphene a combustible material?

Various sources such as https://news.ycombinator.com/item?id=7679154 speculate that graphene will combust at higher temperatures. Is this true? Is the flash point/ temperature of combustion for ...
13
votes
1answer
4k views

Why is the buckminsterfullerene the purest form of carbon?

Other websites say that $\ce{C60}$ doesn't have surface bonds that are attracted by other atoms as in graphite and diamond. I understand that graphite may be attracted by other atoms because of its ...
2
votes
0answers
187 views

Can activated charcoal retain adsorbtion properties even when submerged in liquids?

This is following a question on Skeptics Stackexchange, where apparently medical science claims that activated charcoal can adsorb poison when ingested. One of the members posted a related question on ...
1
vote
1answer
103 views

Reacting carbon dioxide with magnesium in ribbon form

My experiment involves a reaction of magnesium in ribbon form with that of carbon dioxide. I know that the product shall be magnesium oxide (white powder) and carbon (black powder) but I do not know ...
10
votes
1answer
359 views

Why are isotopically pure diamonds 50% more thermally conductive than other diamonds?

A laboratory grown type-IIa diamond (no nitrogen defects) has a lambda of $\pu{1800-2200 W/mK}$, but an isotopically pure diamond of $\ce{^{12}C}$ can have up to $\pu{3320 W/mK}$. Why are $\ce{^{12}C}...
12
votes
1answer
1k views

Can diamond undergo a self sustaining combustion reaction all the way to carbon dioxide?

I know charcoal can smoulder in an incomplete combustion to produce carbon monoxide so I assume diamond also can. If it's heated to a sufficiently high temperature, will the reaction produce enough ...
-3
votes
2answers
3k views

Why does Graphene have a higher melting point than Diamond?

I'm not 100% sure about this, so I just wanted to double-check. I think it has something to do with each carbon atom in Graphene having a delocalized electron and this creates carbon ions that can ...
4
votes
1answer
2k views

If graphite's just a huge polymer of benzene why isn't it an aromatic compound (polymer?)

My teacher had once told me that graphite was just an insanely huge polymer of benzene (Those weren't his exact words but the gist). Today While we were studying aromaticity in organic compounds we ...
3
votes
2answers
12k views

Why is fullerene 60 an insulator while graphite is a conductor?

Graphite is good conductor of electricity because one carbon atom is bonded only three carbon atoms, which enables the presence of free electrons. In fullerene 60 the carbon atoms are also bonded to ...
6
votes
1answer
158 views

How are atoms encapsulated in buckminsterfullerene molecules?

According to nature.com, buckminsterfullerene molecules (bucky balls) can be formed by vaporizing graphite by saturating it with laser irradiation. I haven't entirely understood why the carbon forms ...