Optical effects of charges in colloidal solutions
| Autor: | Railing Chang, Hai-Pang Chiang, Hung-Yi Chung, Chih-Wei Chen, P.T. Leung |
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| Rok vydání: | 2017 |
| Předmět: |
endocrine system
Materials science 010504 meteorology & atmospheric sciences Mie scattering Composite number Nanoparticle Nanotechnology 02 engineering and technology complex mixtures 01 natural sciences Inorganic Chemistry Colloid Fractal Electrical and Electronic Engineering Physical and Theoretical Chemistry Spectroscopy 0105 earth and related environmental sciences digestive oral and skin physiology Organic Chemistry Charge (physics) 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Charged particle Electronic Optical and Magnetic Materials Condensed Matter::Soft Condensed Matter Chemical physics Volume fraction 0210 nano-technology |
| Zdroj: | Optical Materials. 66:43-47 |
| ISSN: | 0925-3467 |
| Popis: | The optical response of charged polymeric and metallic colloids is investigated using effective medium theories for composite systems of nanoparticles. Based on the Bohren-Hunt theory for generalized Mie scattering from charged particles, an effective quasi-static dielectric function previously obtained is applied to the present study to characterize the response from the various colloidal particles. It is found that such effects are more prominent for polymeric and nonmetallic colloidal solutions in general. In addition, the effects of clustering among the colloidal particles are also studied via a fractal model available from the literature. Detailed numerical studies of the dependence of these effects on the amount of extraneous charge, as well as on the geometry and volume fraction of the colloidal particles are presented. |
| Databáze: | OpenAIRE |
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