Download - Man and the Environment
Man and the Environment
Presented by:Ang Kai EnFaith TeoHu Yang
Huang Jia Can
Nanotechnology
Overview
• Introduction• History• Current Development• Impacts• Examples• Implications• Conclusion
Introduction
• Nanotechnology is defined as the study and �use of structures between 1 nanometer and 100 nanometers in size in at least one dimension.
• A nanometer is a billionth of a meter, or about ten atoms
History
1980 •Nanotechnology began as a field.
1981•Scanning Tunneling Microscope was invented (and the creators got Nobel prizes in physics). These microscopes can 'see' objects the size of an atom, with a lateral and depth resolution of 0.1 nanometers
History
1985 •Fullerenes were discovered. This led to several practical implications
2000-2005 •Nanotechnology gained much more attention, publicly and scientifically
2006-Present •Nanotechnology became much more precise, with the
emergence of nanotechnological products on the market
Impacts of Nanotechnology
Positive• Allows for clean ways to produce energy• Allows for eco-friendly fuel e.g. hydrogen-powered fuel cells
• Allows for electronic devices to be smaller and more efficient
• Nanoporous materials can be used for water-filtration and liquid separation
Impacts of Nanotechnology (contd.)
Negative• In differents parts of the particle's life cycle, the particle acts differently, which we do not know clearly. That may be a threat to humans and the environment eg. radiation
• In their free form, nanoparticles has the potential to cause bioaccumulation in plants and fungi
Impacts of Nanotechnology (contd.)
Negative• In their fixed form, they have to be disposed, increasing the amount of trash
• As with all fields of Science, Nanotechnology can be exploited or used destructively, for example weapons or a deadly virus.
Current Development
• DNA Nanotechnology• Smaller Electronic Circuits• Trojan horse-like structures to improve drug delivery to cancerous cells
• Electrically conductive gold nanowires• Graphene (stronger than diamond) - video
Current Development
• Programmable molecular robots (Nano Cars)
•Single molecule sensors and switches
Examples of products made from nanotechnology contd.
Cottons• Nano-Tex researchers attached molecular structures to cotton fibres, resulting in a barrier that causes liquids to bead up and prevents absorption.
• It only requires a thin application and lasts longer than conventional waxes.
• Treated threads repel stains like coffee and are also wrinkle and crease resistant.
Examples of products made from nanotechnology contd.
Sunglasses• Nanofilm has been producing protective and anti-reflective polymer coatings for sunglasses.
• This improves the lens' responsiveness to different light intensities and also repels grime and skin oils
Implications
• Helps man create new materials with two or more other materials
• Helps improve a material'sCost Durability Oxidability
Buoyancy Electrical Conductivity Heat ConductivityStrength
Hardness
Density
Weight
Waterproof
Boiling / Melting Point
Flexibility
Transparency
Friction
6th to 10th
6. Nanotech DVD and Book Collection7. Performance Sunglasses8. Nanocrystalline Sunscreen9. High-Tech Tennis Rackets10.High-Tech Tennis Balls
References
• forbes.com• wikipedia.org• google.com• docs.google.com• All other websites that have helped us in some way or another.
The EndThank You for Your Attention!