Fullerene structure and properties, Physics

Assignment Help:

 

 

FULLERENE: The fullerene is a cage like hollow molecules composed of hexagonal and pentagonal groups of atoms, and especially those formed from carbon, that constitute the third form of carbon after diamond and graphite. However the term has been widened to contain any closed cage structure having more than twenty carbon atoms including completely of three coordinate carbon atoms. A, hollow pure carbon molecule in which the atoms positioned at the vertices of a polyhedron with 12 pentagonal faces and any number (other than one) of hexagonal faces. The fullerene is a just revealed family of carbon allotropes (any two or more forms of the same chemical element) named after the sheet from being planner.

STRUCTURE AND PROPERTIES: - In the fullerene molecule an even number of carbon atoms are arranged over the surface of a closed hollow cage. Each atom is trigonally linked to its three near neighbours by bonds that delineate a polyhedral network, consisting of 12 pentagonal and n hexagons (n may be any number other that one including zero). All 60 atoms in fullerenes 60 are equivalent and lie on the surface distributed with the symmetry of a truncated icosahedrons (an icosahedrons is a polyhedron having 20 faces, but usually a regular icosahedrons is meant, which has faces which are equilateral triangles). The 12 pentagons are isolated and spread symmetrically among 20 linked hexagons. Solid C60 exhibits interesting dynamic behaviour in that at room temperature the individual round molecules in the face centred cubic crystals are rotating isotropic ally (that is freely) at around 108Hz. At around 260k (8.3F) there is a phase transition to a simple cubic lattice accompanied by an abrupt lattice contraction rotation is no longer free, and the individual molecules make rotational jumps between two favoured (relative) orientations configurations, in the lower energy one a double bond lies over a pentagon, and in the other it lies over a hexagon. At 900k (-300 F) the individual molecules stop rotating altogether, freezing into the orientation ally discovered crystal involving a mix of the two configurations.

 

 


Related Discussions:- Fullerene structure and properties

Abortion, I need five pages about abortion

I need five pages about abortion

Light dependent resistor, These resistors change their resistance with vari...

These resistors change their resistance with variations of incident light energy. MANUFACTURING: Cadmium sulphide is obtained in a highly pure state. By adding special m

Distinguish between diamagnetic and ferromagnetic materials, Distinguish am...

Distinguish among diamagnetic and ferromagnetic materials in respect of their (i) intensity of magnetisation, (ii) behaviour in a non-uniform magnetic field and (iii) susceptibilit

Application of physics in a technological context, Students are required to...

Students are required to prepare a one page mini-poster explanation of an application of Physics in a Technological, Biomedical, Biological or Engineering context. It is essential

Illustrate examples of systems in equilibrium, Examples of systems in equi...

Examples of systems in equilibrium: a) a stone resting on the ground; b) a pencil balanced on your finger; c) a ladder placed against the wall, an aircraft flying at a co

Illustrate what is moment of inertia, Q. Illustrate what is moment of inert...

Q. Illustrate what is moment of inertia? Answer:- Moment of inertia is the term utilized to measure or quantifies the amount of mass located at an object's extremities. Fo

Motion, what causes change in motion? what laws govern motion? how do objec...

what causes change in motion? what laws govern motion? how do objects move in one dimension? how do objects move in two dimension?

MULTIPLEXERS, . Design a 32:1 multiplexer using two 16:1 multiplexers and o...

. Design a 32:1 multiplexer using two 16:1 multiplexers and one OR Gate.

Oscillatioms, Oscillation of mercury coloumn in a U-tube

Oscillation of mercury coloumn in a U-tube

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd