Can anyone tell me that color change origin of synthesized nanoparticles in the different sizes is reflection or absorption or scattering effect ?
It may depend on the material of the nanoparticles.
This web may be of some help:
http://www.webexhibits.org/causesofcolor/9.html
Color change due to different sizes is quite prominently seen in Gold nanoparticles. When the light interacts with a particular sized NP, it is absorbed and a part reflected. There is a variation depending on size. The metals have peculiar ability to reflect back a portion of light. A 30 nm particle would normally absorbs blue green and red light is reflected. This changes as the particle size is changes to bulk or is lower. It is the tunability of absorption of Surface plasmons and consequent reflection which causes color change.
The ability to scatter is also size dependent property of these nanoparticles which is being used in many applications.
The following reference may be useful.
http://www.sigmaaldrich.com/materials-science/
hello, can you tell me about the shape (or/and type, Au, Ag, Tio2, Al2O3 or etc...) of your nanoparticles? Not alone reflection, absorption and scattering effects but also various factors need to be considered. for example: type, shape, size, Synthesis Conditions and ...
سلام خانم دادخواه
وقت بخیر.در مورد نانوذرات فلزی تا جایی که اطلاع دارم شکل و سایز و بستر (نوع دی الکتریک) در
redshift و blushift
طیف جذب و پراکندگی و خاموشی نقش دارد اما برام جالبه که بفرمایید شکل و و سایز و ...
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