Man and the Environment Presented by: Ang Kai En Faith Teo Hu Yang Huang Jia Can.

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Man and the Environment Presented by: Ang Kai En Faith Teo Hu Yang Huang Jia Can Nanotechnology

Transcript of Man and the Environment Presented by: Ang Kai En Faith Teo Hu Yang Huang Jia Can.

Page 1: Man and the Environment Presented by: Ang Kai En Faith Teo Hu Yang Huang Jia Can.

Man and the Environment

Presented by:Ang Kai EnFaith TeoHu Yang

Huang Jia Can

 

Nanotechnology

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Overview

• Introduction• History• Current Development• Impacts• Examples• Implications• Conclusion

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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

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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

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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

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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

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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

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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.

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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

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Current Development

• Programmable molecular robots (Nano Cars)

•Single molecule sensors and switches

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Examples of products made from nanotechnology

Cerax Nanowax• One of the first products made by nanotechnology

• Used on base of skis and skateboards

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Examples of products made from nanotechnology contd.

Nano-Tex• 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. 

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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

 

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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

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References

• forbes.com• wikipedia.org• google.com• docs.google.com• All other websites that have helped us in some way or another.

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The EndThank You for Your Attention!