Applied Chemistry I: UNIT 2: Nanochemistry
Basics of Nanochemistry
Nanoparticles are the particles, the size of which ranges from 1‒50 nm. Generally they are obtained as colloids.
Unit II
Nanochemistry
INTRODUCTION
The prefix (nano), in
the word nanochemistry, means a billionth (1 x 109 m). Atoms are
very small and the diameter of a single atom can vary from 0.1 to 0.5 nm. It
deals with various structures of matter having dimensions of the order of a
billionth of meter.
BASICS OF
NANOCHEMISTRY
1. Nanoparticles
Nanoparticles are the
particles, the size of which ranges from 1‒50 nm. Generally they are obtained
as colloids. The colloidal particles have a tendency to remain single crystal
and hence are called as nanocrystals. A large percentage of atoms in
nanocrystals are present on the surface.
Nanocrystals possess
electronic, magnetic and optical properties. Since the nanoparticles exhibit an
electronic behavior, governed by the quantum physics, they are also called as
quantum dots.
2. Nanomaterials
Nanomaterials are the
materials having components with size less than 100 nm at least in one
dimension. Four important types of nanomaterials are given in table 2.1.
Table 2.1: Types (or) Categories of nano‒materials.
Types
(or) Categories of nano‒materials.
0 ‒ dimension Co‒ordinates
‒ Examples: Nanoclusters
1‒dimension Co‒ordinates
‒ Examples: Nanotubes, nanowires, nanorods
2‒dimension Co‒ordinates
‒ Examples: Graphene, mxenes, thin films and surface coatings
3‒dimension Co‒ordinates
‒ Examples: Precipitates, colloids, bulk, powders, bundles of nanotubes and
wires
3. Nanochemistry (or) Nanoscience
Nanoscience is defined
as the study of phenomena and manipulation of materials at atomic, molecular
and macromolecular scales.
4. Nanotechnology
Nanotechnology is
defined as the design, characterization, production and applications of
structures, systems and devices by controlling size and shape at 10‒9
m scale (or) the single‒atomic level.
Applied Chemistry I: UNIT 2: Nanochemistry : Tag: Applied Chemistry : - Basics of Nanochemistry
Applied Chemistry I: UNIT 2: Nanochemistry
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Applied Chemistry I
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