1

What is Nanotechnology• Nanotechnology is the exploitation of the abilit

y to control matter at dimensions between 0.1 and 100 nm, resulting in unique functionalities

0.1 nm 0.01 m10 nm

0.1 m100 nm

0.01 mm10 m

0.1 mm100 m

1 cm10 mm

10-2 m10-3 m10-4 m10-5 m10-6 m10-7 m10-8 m10-9 m10-10 m

1 nanometer (nm) 1,000 nanometers = 1,000,000 nanometers =

1 millimeter (mm)1 micrometer (m)

Ant~ 5 mm

Fly ash~ 10-20m

Human hair~ 60-120m wide

Red blood cells(~7-8 m)

Dust mite

200 m

ATP synthase~10 nm diameter

DNA~2-1/2 nm diameter

Atoms of siliconspacing 0.078

nm

Scale of ThingsScale of Things

2

Organic-Inorganic Nanocomposite Materials

Properties of Organic & Inorganic Material

Two Influencing Factors

1.The interface between the organic & inorganic phase

2.Domain sizes of these two phases

3

Sol-Gel TechnologyThe main idea of the sol-gel process is the spontaneous formation of a dual phase material (gel), prepared from the solution (sol), containing inorganic precursors (前驅物 ) and stabilizing agents with hydrolysis(水解 ) & condensation(縮合 ) reaction. Further transformation of the gel phase is driven by the evaporation of the solvent, and the subsequent formation of the xerogel phase.(熟化 aging). Drying of the xerogel completely removes solvent molecules, leading to further aggregation of inorganic clusters and the formation of solid materials.

Hydrolysis Reaction

Condensation Reaction

4

• Control Parameters– Precursors– Concentration of Metal Salts– Temperature– Catalysts– pH

Sol-Gel Technology (cont’d)

• Advantages – Low temperature route (below 200oC)– Uniform particle size distribution– Provides good homogeneity– Concentration of metals in the coatings can be controlled with ease– Chemical purity of nanocomposites

• Drawbacks– high cost for the majority of alkoxide precursors– long processing times

Hydrolysis & Condensation

5

Applications

Anti-Glare

Anti-Abrasion

Anti-Rusting

Hydrophobic

6

Nano Hybrid Material• PEACCO NON-CHROMATE PLAST

ICAL/ METAL SURFACE TREATMENT SOLUTIONS– Nanocomposites

• The hybrid from inorganic nano-dispersion metal and organic epoxy .

– Sol-Gel Method• uses an aqueous solution to apply on

the metal to form a organic-inorganic hybrid thin film.

– Traditional Coating Method• This coating can be applied on the m

etal by many techniques like dip, spin, spray, or roller coatings.

– Strong chemical bonding• This organic-inorganic hybrid coating

can chemically bond to the metal and can also chemically bond to organic adhesives/paints.

– Apply on Various Metals and Plastics• By modifying the composition of the c

oating solution, this technology can apply on different kinds of metals and plastics.

Strong chemical bonding