Mercaptopropyl-functionalized helical mesoporous silica nanoparticles with c2mm symmetry: Cocondensation synthesis and structural transformation in the dilute solution of mixed cationic and nonionic surfactants

Radiative Relaxation of Gold Nanorods Coated with Mesoporous Silica with Different Porosities upon Nanosecond Photoexcitation Monitored by Time-Resolved Infrared Emission Spectroscopy

“…The coating of a mesoporous silica layer on AuNRs was performed according to a procedure reported previously . The micellar structure of mixed surfactants of ionic CTAB and nonionic C 12 EO 4 was used as the soft template.…”

Mesoporous silica-giant particle with slit pore arrangement as an adsorbent for heavy metal oxyanions from aqueous medium

“…Similar discoveries of nanomaterials have been useful in a number of applications. [26][27][28] Owing to the higher diffusion and external pore arrangement, 2D mesoporous silicas exhibit appreciable activity during the adsorption process. 29,30 Recently, there has been signicant push to synthesize mesoporous silica adsorbents because of their promising industrial and technological applications.…”

MCM-48 nanorods: a self-assembled isotropic cubic mesostructure with anisotropic morphology

“…The synthetic strategy is originated from our discovery of a synthesis system leading to silica mesostructures (designated as MMT-1) correlated to the ribbon phase with 2Drectangular c2mm symmetry. [14][15][16] Since ribbon phases and the Ia3d phase are present between 2D-hexagonal and lamellar liquid crystal phases, 4,7 it might be possible to form the Ia3d mesophase by modifying the synthesis of MMT-1. Indeed, we found that MCM-48 nanospheres and, more interestingly, MCM-48 nanorods could be prepared by adding a suitable amount of isopropanol (IPA).…”

“…We noticed that the formation of MCM-48 nanorods was very sensitive to the conditions of mixing and stirring. That was the reason why we failed to perform in situ SAXS measurements by using a continuous flow-type setup [14][15][16] and why additional peaks that were weak in intensity also appeared in the SAXS pattern. For the formation of MCM-48 nanospheres (with x = 47), a similar but slightly faster structural transformation was observed (cf.…”

“…19 During the IPA-free synthesis of helical MMT-1, the preferential adsorption of anionic silicate species (produced from TEOS hydrolysis) onto cetyltrimethylammonium (CTA) cations induces a segregation of CTAB and C 12 EO 4 , resulting in deformed and bent silicatropic micellar rods. [14][15][16] When IPA is added, the penetrating IPA molecules may reduce the repulsion between surfactants' head groups and, after subsequent introduction of silicate species, lead to a uniform decrease of interfacial curvature to form the thermodynamically favored Ia3d mesostructure. As for MCM-48 nanorods, a proposed formation pathway based on the results of SAXS and SEM is shown in Scheme 1.…”