Study of Atmospherically Relevant Core–Shell Aerosol Using Optical Trapping and Mie Scattering (CAT#: STEM-ST-0076-YJL)

Introduction

The prevalence of aerosols in the lowest layer of the atmosphere, the troposphere, is well known, however, their contribution to the Earth's climate remains uncertain. Aerosols contribute to the climate in two ways; directly, by scattering and absorbing solar radiation, and indirectly, by acting as cloud condensation nuclei (CCN) and influencing cloud radiative properties. Aerosols exist as a complex mixture of chemicals and morphologies, which influences their ability to form CCN and scatter or absorb radiation.<br />The presence of an organic coating or shell surrounding the aerosol core has the ability to influence water uptake of an aerosol, the amount of scattered light or the amount of absorbed solar radiation and to affect how the aerosol behaves in subsequent heterogeneous reaction with gas-phase oxidants. It is therefore important to characterise the optical properties of coated aerosols to further understand their effect on the climate.

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Principle Applications Procedure Materials Notes Related Products

Principle

Mie scattering is defined as the type of scattering in which the diameter of the particle is the same or more than the wavelength of the radiation. Mie scattering gives a generalized solution for a system where a scattering of light takes place by a homogenous spherical medium. And this medium should have a refractive index different from that of the medium through which the light is traversing.
Unlike Rayleigh scattering, Mie scattering is not a physically independent phenomenon rather, it is a solution to Maxwell's equations for situations where the phase of the incident angle can change within the dimension of the scattering particles. Mie scattering is more commonly known as Mie solution, and it is named after Gustav Mie, a German physicist.
Mie scattering is also known as aerosol particle scattering, takes place in the atmosphere below 1,500 feet. In Mie scattering, the diameter of the spherical particles through which the light is scattered is approximately equal to the wavelength.

Applications

Mie scattering occurs in a variety of applications, including atmospheric science, cancer detection and treatment, metamaterials, and parasitology. Another application is the characterization of particles by optical scattering measurements.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Mie scattering measurement system

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