Magnetic optical sensor particles

Mistlberger G, Chojnacki P, Klimant I (2008) Magnetic sensor particles an optimized magnetic separator with an optical window. J Phys D Appl Phys 41 085003(1)-085003(9)... 

The chemical-physical properties of nanocomposite and membrane finds unique place in sensor application due to combinational properties. The basic use of nanocomposite is to the products, which show many folds of improvement on the physical and mechanical properties or on the processing properties upon addition of very minute quantity of nanomaterials [99], Nanoscale particles not only enhance the mechanical properties but also have wide potential in the field of electronic, magnetic, optical, and chemical field. The polymer nanocomposites provide improvement over other known composites in thermal, mechanical, electrical, and even air barrier properties [64-70], Formulation of nanocomposite membranes with suitable polymer, suitable nanoparticles, and the processing technology of the nanocomposite are critical to success factor to dominate the gas sensor product in the market. 

It is important to reduce the size of the magnetic particles in the composite in order to obtain superparamagnetic behavior, allowing the sample to be used as a low magnetic field sensor. Optical measurements showed that as the size of the magnetic particle decreases, a blueshift in the UV-vis absorption spectra occurs, which is related to quantum confinement effects. 

Another very important carrier for SAMs are gold nanoparticles [37,54] because of their stability and their fascinating aspects associated with individual particles, size-related electronic, magnetic and optical properties (quantum size effects), and their applications in sensors [91] and for biomolecular labelling or as immunoprobes [53,92,93]. 

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