Instructed on: 02-Mar-2012 | Session: #07 Nanotechnology By: Mohanad Yehia Topic Code: TCW-06-2012 All Copy Rights Saved to the 7th Students’ Conference on Communication and Information Based in the Faculty of Computers and Information Cairo University – Egypt 2011/2012 www.scci-cu.com
AGENDA• How big is the nano.• Definition of nanotechnology.• Why nanotechnology?• Applications.
How big is the nano?• Nano is a prefix meaning a billionth. Used primarily in the metric system, this prefix denotes a factor of 10−9 or 0.000000001.
Definition• Nanotechnology is the engineering of functional systems at the molecular scale.
Material perspective• Materials reduced to the nanoscale can show different properties compared to what they exhibit on a macroscale, enabling unique applications.• For instance – opaque substances become transparent (copper) – stable materials turn combustible (aluminum) – insoluble materials become soluble (gold)
Nanomaterials• The nanomaterials field includes subfields which develop or study materials having unique properties arising from their nanoscale dimensions.
Bottom-up approaches• seek to arrange smaller components into more complex assemblies.• molecular self-assembly seeks to use molecular recognition in particular, to cause single-molecule components to automatically arrange themselves into some useful conformation.
Top-down approaches• seek to create smaller devices by using larger ones to direct their assembly.• Many technologies that descended from conventional solid-state silicon methods for fabricating microprocessors are now capable of creating features smaller than 100 nm.