Chemistry of Engineering Materials Flashcards
X-ray diffraction
are electromagnetic waves or light photons with very high energy and large frequency.
xray
. When these photons pass through very minute slits as few angstrom, they seem to spread out or produce a
diffraction
when these light photons pass through many narrow spaces that are evenly spaced, scattered waves form a series of bright and dark bands, called
diffraction pattern
pertain to the constructing overlapping of the light waves
Bright bands
the destructive overlapping of the light waves.
Dark bands
develops from the scattering of X-rays by a regular arrangement of atoms, molecules or ions.
xray diffraction
It is this phenomenon that made X-rays as one of the most powerful tools in determining the structure of crystals.
x-ray diffraction
Australian botanist; how liquid crystals were identified to exist
Frederick Reinitze
are a state of matter which has properties amid typical liquids and solid crystals.
Liquid Crystal
may flow like liquids but the particles maybe oriented like that of the crystals.
Liquid Crystals
three types of liquid crystal formation
Nematic, Smectic A. and SMectic C
, the particles are arranged in an aligned manner such that their long axes are pointing in the same direction.
Nematic Liquid Direction
, the particles are oriented along the layer normal while in the SmC phase, the particles are tilted away from the normal.
Smectic A
the particles are tilted away from the normal.
Smectic C
have revolutionized technology to such an extent. They are used in most diverse display devices. They are used as pressure and temperature sensors and display element in digital machines, tools, gadgets, appliances, etc. `
LC (Liquid Crystal)
