Abstract
Optical and structural properties of melamine–formaldehyde (MF) aerogels have been studied by transmittance spectroscopy. By combining the two-phase model with Rayleigh model, the correlation length of the void phase and the mean particle size of MF aerogels prepared from aqueous melamine–formaldehyde solutions at concentration in weight of 10% and 12%, and pH of 2.3, 2.0, 1.8, and 1.5, were estimated. Correlation of the correlation length, the particle size and the visible integrated transmittance on the concentration and the pH has been established. Optical transparency of the dried MF aerogels depends strongly on the concentration of the precursor and the gelation temperature than the solution pH.
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