SHG-Activity of Polar Nano-Structures of LC-RED-PEGM-7 Based Sono-Gel Hybrid Materials

Preparation of Fullerene (C60) Based SiO2 Sonogel Hybrid Composites: UV Laser Induced Photo-Polymerization, Morphological, and Optical Properties

“…The diffusion process seems to be enough to fabricate suitable C 60 based SiO 2 sol-gel samples for optical characterization as has been proven by Zerda et al 35 Although the resulting bulk hybrids possess higher purity compared to other traditional synthesized sol-gel hybrid composites and exhibit good monolith structures, the geometrical shape is no longer preserved as compared to hybrid samples prepared by the sonogel route with THF (tetrahydrofuran)-dopant based solutions. [26][27][28][29] This is due to the low diffusion speed of fullerenes within the SiO 2 based sonogel network; 35 we believe that increasing the drying time of the samples by controlling the temperature environment will produce homogeneous C 60 -doped cylindrical sonogel samples. Otherwise, the slow diffusion of fullerenes taking place in different parts of the drying samples in a randomly way, will lead to the formation of different bulk samples of irregular geometrical shapes (typical surface dimensions and thickness obtained for our samples were in the range of 8-25 mm 2 and 0.8-3.0 mm, respectively).…”

“…This new approach has been recently developed in our research group and successfully implemented to develop several hybrid composites for optical applications. [25][26][27][28][29] The sonogel materials obtained by this method exhibit an amorphous SiO 2 -matrix with large surface areas, high purity level and nanometric porosity; which provides a favorable environment for the inclusion of interesting organic compounds with optical functions. In order to generate CF-sonogel materials, energetic pulsed ultrasonic waves, instead of acidic and basic catalysts, are applied at the TEOS/H 2 O (tetraethylortosilicate/three-distilled water) reactants interface to produce acoustical cavitation.…”

Linear and non-linear optical properties of 2,5-disubstituted pyrroles supported by a catalyst-free SiO2 sonogel network

“…For this purpose, we exploited the novel catalystfree (CF) sonolysis route to produce highly pure sol-gel samples, which are generated via a sonochemical reaction induced by ultrasonic (US) irradiation. This approach has been successfully implemented to develop several hybrid composites for optical applications [18][19][20][21]. The sonogel materials obtained by this method exhibit an amorphous SiO 2 matrix with large surface area, high purity and nanometric porosity.…”