"Carbon atoms" refers to the tiny particles that make up the element carbon. Carbon is one of the most important elements on Earth and is found in many different things, including plants, animals, and even our own bodies. These atoms join together to form molecules and are the building blocks of life.
Full definition
The shells, called tests, are made mainly of calcium carbonate, which the animals derive from
carbon atoms in the air and water.
The wonder material graphene, a single layer of
carbon atoms with extraordinary properties, has been proposed as one solution.
The diamond - like structural unit consists of six - sided rings of
carbon atoms bonded together in chains surrounded by a halo of hydrogen atoms.
There are a lot
more carbon atoms in the form of CO2 in the atmosphere than in black carbon.
Whenever a pair of hydrogen atoms is missing the
adjacent carbon atoms must form a double bond which produces a weak link in the carbon chain.
The
same carbon atoms in your body today have been used in countless other molecules since time began.
In the case of
carbon atoms especially, this means complex molecules are sure to form spontaneously, and these complex molecules can influence each other to create even more complex molecules.
This new molecule also has a carbon ring attached to a sulfur atom, and a short string of
carbon atoms hanging off the sulfur.
Last summer the lab reported capturing changes in the pattern of bonding among graphite's
carbon atoms following intense compression of the sample.
They are also all saturated fats, chains of single - bonded
carbon atoms with hydrogen atoms neatly lined up on either side of each carbon.
Long - chain fatty acids have
more carbon atoms, which means they require higher temperatures to melt.
All fatty acids consist for the most part of a chain
of carbon atoms with varying numbers of hydrogen atoms attached to them.
Using the same technique, a few years later they succeeded in distinguishing different types of chemical bond
between carbon atoms in a hydrocarbon molecule.
But the researchers discovered that sheets of
carbon atoms arranged in a pattern of hexagons and pentagons can curl up and ultimately close to form hollow cages.
The result was a plasma reactor as hot as the sun in
which carbon atoms form into crystal lattices indistinguishable from natural diamonds.
In 2004, two scientists realized they had isolated a single layer of
carbon atoms on a scotch tape used to clean a graphite crystal.
Many also contain «aromatic» rings — hexagons of
carbon atoms linked by alternating double and single bonds.
Chemically known as methane, natural gas is among the simplest molecules on Earth: a
single carbon atom surrounded by four hydrogen atoms.
Methane consists of a single
carbon atom surrounded by four hydrogen ones, giving the gas its chemical assignation of CH4.
The catalyst remnants can be difficult to remove by physical or chemical means because the same carbon - laden gas used to make the tubes lets
carbon atoms form encapsulating layers around the remaining iron, reducing the ability to remove it during purification.
Disrupted oscillations The researchers focused on nitrogen — vacancy (NV) centers, imperfections in diamond that arise where an atom of nitrogen and an empty space replace
carbon atoms at two neighboring spots in the crystal lattice.
This is possible
because carbon atoms occur in heavy and light forms, or isotopes, and measuring the relative amounts of each can reveal the source of the carbon.
The strong bonds between adjacent
carbon atoms make individual nanotubes one of the toughest materials known.
Ethylene (or IUPAC name ethene) is the simplest alkene hydrocarbon, consisting of four hydrogen atoms and two
carbon atoms connected by a double bond.
Now, scientists from the research group of Nir Bar - Gill at the Hebrew University of Jerusalem's Racah Institute of Physics and Department of Applied Physics, in cooperation with Prof. Eyal Buks of the Technion — Israel Institute of Technology, have shown that ultra-high densities of NV centers can be obtained by a simple process of using electron beams to kick
carbon atoms out of the lattice.
The hitch, so far, has been that the most promising tubes — single - walled nanotubes (SWNTs), consisting of one layer of
carbon atoms arrayed like rolled - up chicken wire — can be made only by the thimbleful and can cost up to $ 2000 a gram.
Each time the chemists add a head, body or tail to a sample of beads, they also attach simple organic compounds called ketones
containing carbon atom chains of varying lengths.
So for the current technology that we have, it makes more sense to stick with [molecules with fewer
carbon atoms] such as ethylene or carbon monoxide, and then to upgrade those molecules using other processes.
Yet, most of these catalysts stop working after just a minute of operation
as carbon atoms cover the catalyst particles with an amorphous coating that prevents nanotubes from taking shape.
A representative material of this type is carbon nanotubes, which are rolled sheets of the graphene hexagonal network, which is only one
carbon atom thick.
They replaced
particular carbon atoms in the hexagonal lattice with boron and nitrogen atoms using surface chemistry, by placing suitable organic precursor compounds on a gold surface.
After speaking to Professor Dresselhaus about her laser ablation work, they began to look at
how carbon atoms are bound together.
For example, making vitamin B12 involves going from uro» gen III to a corrin ring system with one
less carbon atom and more double bonds.
Each black line represents a chemical bond, and
carbon atoms sit at the unmarked vertices of lines.
Phrases with «carbon atoms»