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Functionally gradient silica aerogels have been applied in many areas with their gradient porosity, refractive indices and acoustical impedance. For the purpose of accurately controlling the process of gradient formation, a new approach called slope-rotation method was proposed. Such a method could benignly fabricate gradient density sol by sloping, rotating and mixing the two different density sols...
A new type of antireflective (AR) coating materials with easily tailorable refractive index were successfully prepared by the sol-gel method based on the deposition of colloidal hollow silica nanoparticles (HSNs). HSNs were synthesized using tetraethylorthosilicate (TEOS) as the precursor, and then modified by methyltriethoxysilane (MTES). It is found that the refractive index (n) can be precisely...
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