| Abstrakt: |
A comprehensive study including (i) the synthesis of colloidal zeolite-β nanoparticles with size below 100 nm from precursor suspensions, (ii) kinetics of the crystallization process of zeolite-β, (iii) stabilization of the β nanocrystals in coating suspensions, (iv) preparation of homogeneous thin films by a spin-coating approach, and (v) physicochemical characterizations of the films are the focus of this paper. It has been demonstrated that the crystallization process of β was completed within 7 days, and the final size and shape of the nanocrystals resemble the amorphous particles in the precursor suspensions. Next, the crystalline β particles were stabilized in colloidal suspensions under addition of inorganic silica-based binders and further applied for a spin-on process of films. It has been confirmed that the number of coating steps, speed of deposition, concentration of coating suspensions, and type of binders had a pronounced influence on the thickness, mechanical, and optical properties of the films. The refractive index ( n) of the films prepared with binders is increased slightly due to introduction of amorphous silica, thus leading to the formation of denser and more mechanically stable zeolite-β layers. |
