nanochemistry course oslo university - forsiden › studier › emner › matnat › kjemi ›...

Nanochemistry Course Oslo University E

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UM Reinhard Nesper

Laboratory of Inorganic Chemistry

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Swiss Federal Institute of Technology (ETH)

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CH-8093 Zürich, Switzerland

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ETH main building

01.11.2007 Nanochemistry UIO 1

Nanochemistry Course Oslo University

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M Synthesis, Structures, Properties & Applications

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• World & Nanoworld - philosophy, general definitions, hopes, challenges

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IU • Physico-Chemical Considerationsband structures, typical “nano effects”

• Colloids + General Syntheses of Nanoparticles

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Co o ds Ge e a Sy t eses o a opa t c es• Fullerenes, C-nanotubes and other carbon-related matter• Oxidic nanotubes and nanofibers

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• Future Energy and Nanosciences• Other Inorganic Nanotubes + Fibers • Nano Clusters & nano metals

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• Bio-Nano Aspects • Risk Discussion


Where are We 1 – 100 nmE

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where is the

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Nano World?

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The Nano World The Nano World

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Why

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Nano World 1 – 100 nmE

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UMpart of colloid world

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The Nobel Prize in Chemistry 1925

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"for his demonstration of the

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heterogenous nature of colloid solutions and for the methods he

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IU used, which have since become fundamental in modern colloid chemistry"

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chemistry

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From the Nobel lecture:“…Scheele, therefore, has described here an unstable colloidal solution of manganesedioxide in hydrochloric acid which, when diluted with water, allows the manganese dioxide to be

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This reported case of the occurrence of a colloid does not stand alone. Even in the year 1665 gold purple had been described by Andreas Cassius and his son. This purple proved to be a tested dye for glass melts, naturally without its colloidal nature being recognized.


Colloids E

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Roman gold glasses

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Colloids

Size-dependent PropertiesE

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Colloids

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Ways to the Nano WorldE

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Bottom up to Nano

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Stable nucleus

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Size of nucleus r


Size of nucleus r

Nanoparticles and Size EffectsE

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Size : 1 –100 nm

Su f c t lum ti : c itic l

clusters

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optical properties : f(size)

hollow spheroids

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magnetism : f(size) tori

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electronic properties : f(size)

f( )

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integration density of functions : very large

01.11.2007 Nanochemistry UIO 15tubes

integration density of functions : very large

Nano Particles

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Nano Particles Materials & Physical EffectsE

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Electrons in the Nano WorldElectrons and Dimensions

Examples: Nano-SiliconE

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The powders obtained as described above were dispersed in methanol using mild sonication, then etched with solutions of 0.5–4% HF and 20–30% HNO3 in water to reduce the particle size and passivate the

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LVE particle surface. Acid solutions were prepared from 49 to 51 wt% HF, 70% HNO3, and DI water in the

necessary proportions. After etching, the particles were collected on polymeric membrane filters and washed with water and methanol.

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The Nano World

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Size of Nano Particles and LuminescenceE

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Development of Nanotechnology

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NanotechnologyNanotechnologyE

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Nanotechnology – quo vadis?

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nanochemistry course oslo university - forsiden › studier › emner › matnat › kjemi ›...

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