Characterization and mesostructure control of mesoporous fluorinated organosilicate films

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

“…[ 166 ] It was shown for thin fi lms that fl uoro-silanes act as amphiphilic molecules allowing their co-assembly with a low fraction of CTAB surfactant. [ 182 ] As it was pointed out by Brinker et al [ 41 , 146 ] a radial concentration gradient occurs in drying droplets with an enrichment of droplet surface in water (due to the preferential evaporation of ethanol). One could then postulate a preferential co-assembly of fl uoro-silanes and CTAB at the particles surface (rich in water) which causes a decrease of the micelles curvature leading to a lamellar phase while the core of the particles remains 2D-hexagonal due to fl uoro-silanes microphase separation.…”

Template-assisted encapsulation of fluorinated silanes in silica films for sustained hydrophobic–oleophobic functionality

“…1, was selected for this study because it has a fairly large molecular weight (average = 1850 g/mol) compared to perfluoroalkylsilanes and two silane grafting end groups. Longer functional molecules have been shown to increase the hydropobic/ oleophobic character of films [26,29], and two grafted ends increases resistance to mechanical removal from the matrix [30]. Additionally, interchain hydrogen bonding between amide moieties has been found to enhance intermolecular stability [31][32][33].…”

“…Surfactant templating has been used to fabricate mesoporous films that are popular for applications like catalysis and separations and so are generally engineered for high porosity and surface area. There are some reports on the fluorine functionalization of mesoporous silica [24][25][26][27][28]. Of these, only the works by Bae, Jung et al [26,27] involve synthesis of mesoporous films via co-condensation with functional moeties, which, unlike the post-synthesis grafting approach, is the only templating route that fully incorporates the functional groups in the bulk, in addition to being a single step process.…”

“…There are some reports on the fluorine functionalization of mesoporous silica [24][25][26][27][28]. Of these, only the works by Bae, Jung et al [26,27] involve synthesis of mesoporous films via co-condensation with functional moeties, which, unlike the post-synthesis grafting approach, is the only templating route that fully incorporates the functional groups in the bulk, in addition to being a single step process. Bae, Jung et al have been concerned primarily with engineering low-dielectric constant materials, and to this end have also focused on maximizing porosity.…”

Thermally induced mesophase development in ethanesilica filmsvia macromolecular templating approach

“…26,27 From a practical standpoint, spin coating would be an efficient process method for the rapid preparation of mesostructured films on a substrate. [28][29][30] In the present study, we describe an approach for the synthesizing ordered mesoporous organosilicate films by spin coating method employing 1,2-bis(triethoxysilyl)ethane (BTESE) as an inorganic precursor and poly(ethylene oxide)-poly (DL-lactic acid-co-glycolic acid)-poly(ethylene oxide) (PEO-PLGA-PEO: LGE49) as a structure-directing agent. Previously, more hydrophobic PLGA block than the PPO block in typical PEO-PPO-PEO block copolymers is proven to provide more efficient contrast between hydrophilicity and hydrophobicity such that the organosilicate is effectively confined in the PEO matrix phase.…”