Evaluation of Hair Micromechanics by Brillouin Scattering (CAT#: STEM-ST-0148-YJL)

Introduction

Hair is a complex system formed by several morphological components that act as a unit. It can be divided into two major structures: the follicle and the fibre. The part that we see above the skin corresponds to the hair fibre, while the hidden part inside the skin is the hair follicle. The latter component is the living part of the hair and it generates the hair fibre. The hair fibre is a non-living structure, and its elastic properties can be changed by ageing, environmental factors, as well as under the influence of water, temperature and reagents such as those used in cosmetic treatments.

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Principle Applications Procedure Materials Notes Related Products

Principle

From a quantum point of view, Brillouin scattering is an interaction of light photons with acoustic or vibrational quanta (phonons), with magnetic spin waves (magnons), or with other low frequency quasiparticles interacting with light. The interaction consists of an inelastic scattering process in which a phonon or magnon is either created (Stokes process) or annihilated (anti-Stokes process). The energy of the scattered light is slightly changed, that is decreased for a Stokes process and increased for an anti-Stokes process. This shift, known as the Brillouin shift, is equal to the energy of the interacting phonon and magnon and thus Brillouin scattering can be used to measure phonon and magnon energies.

Applications

Brillouin scattering is used to determine acoustic velocities and elastic properties of a number of crystalline solids, glasses, and liquids.

Procedure

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

Materials

Brillouin scattering measurement system (Brillouin spectrometer)

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