A Comparative Study of Nanofluids for Tuneable Filter Operation

(3) . In this paper the optical transmittance spectrum of hematite, silicon, gadolinium and titanium nitride with the variation of volume fraction, thickness of liquid layer and particle diameter will be analysed using simulation results for the determination of feasibility of their use in tuneable optical filter operation. The first decade of nanofluid research was primarily focused on measuring and modelling fundamental thermo physical properties of nanofluids (thermal conductivity, density, viscosity, heat transfer coefficient). Early research on nanofluid filters was associated with solar energy harvesting. The appropriate liquid-filter material must meet several requirements, including adequate refractive index and absorption coefficients, optical constants that determine a satisfactory spectral response, solubility and stability in cold and hot water, and environmental safety. An ideal optical limiter should be transparent to low energy laser pulses and opaque at high energies, so that it can protect human eyes and optical sensors from intense laser radiation (4) . This paper compares the response of four different types of nanoparticles namely hematite, silicon, gadolinium and titanium nitride in water (which acts as the basefluid here) to different wavelengths. The analysis is based on simulation results only which do not account for temperature effects and external magnetic and electric fields.