Replies to This Discussion

Permalink Reply by Aravind on September 18, 2010 at 3:57pm

Hi Shereen,

The main parameters of nanoparticles are their shape, size, and the morphological sub-structure of the substance. Nanoparticles may be presented as an aerosol, a suspension or an emulsion. In the presence of agents (surfactants), the surface and interfacial properties may be modified. Indirectly such agents can stabilise against coagulation or aggregation by conserving particle charge and by modifying the outmost layer of the particle.

Depending on the growth history and the lifetime of a nanoparticle, very complex compositions, possibly with complex mixtures of adsorbates, have to be expected. In the typical history of a combustion nanoparticle, for example, many different agents are prone to condensation on the particle while it cools down and is exposed to different ambient atmospheres. Complex surface chemical processes are to be expected and have been identified only for a small number of particulate model systems. At the nanoparticle - liquid interface, polyelectrolytes have been utilised to modify surface properties and the interactions between particles and their environment.

At some point between the Angstrom level and the micrometre scale, the simple picture of a nanoparticle as a ball or droplet changes. Both physical and chemical properties are derived from atomic and molecular origin in a complex way. For example the electronic and optical properties and the chemical reactivity of small clusters are completely different from the better known property of each component in the bulk or at extended surfaces.

Courtesy: SCENIHR journal

Thanks & Regards,
Arun

• ▶ Reply

Permalink Reply by shereen anjum on September 18, 2010 at 8:16pm

ohhh thanx dear.....

• ▶ Reply

Permalink Reply by RajaKumar.G on September 24, 2010 at 11:22am

hii u wana to knw this mail me microlabsraj@gmail.com

• ▶ Reply

Permalink Reply by Azizan Aziz on September 26, 2010 at 9:05am

The electronic, magnetic and optical properties of nanoparticles depend on size.

• ▶ Reply

Permalink Reply by shereen anjum on September 30, 2010 at 8:14am

yes i want 2 knw abt it...if u have any info about it please tell me.....

• ▶ Reply

Permalink Reply by shereen anjum on September 30, 2010 at 8:18am

searching the properties of copper nanoparticles bt no gud results found for dat......:(

• ▶ Reply

Permalink Reply by Aravind on September 30, 2010 at 7:36pm

Hello Shereen,

Generally the physical and chemical properties of Copper Nanoparticle (99.8%, 25nm) may be:

Purity............................99.8%
Color ............................Black-brown nanopowder
APS...............................25 nm
SSA...............................30-50 m2/g
Morphology.................Spherical
Bulk density.................0.15 - 0.35 g/cm3
True density.................8.94 g/cm3
Corrosion prevention...Partially passivated

Please find more details in: grad.uprm.edu/tesis/riverabetancourt.pdf

Thanks,
Arun

• ▶ Reply

▶ Reply to Discussion