Infiltration of pressurized promoter solutions in a mesoporous silica
نویسندگان
چکیده
The infiltration of pressurized aqueous solutions of sodium cholate hydrate (CSH) and ammonium 8-anilino-1-naphthalenesulfonate (1,8-ANS-NH4) in a hydrophobic silica gel is investigated experimentally. The CSH and 1,8-ANS-NH4 molecules act as promoters that lower the infiltration pressure in relatively large nanopores, resulting in the staged sorption isotherm curves. When the CSH concentration and the 1,8-ANS-NH4 concentration are relatively low, the infiltration plateau can be three staged. This finding has important relevance to developing programmable nanoporous protective and damping systems. 2007 Elsevier Inc. All rights reserved.
منابع مشابه
Mesoporous Silica Nanoparticles as a Nanocarrier for Delivery of Vitamin C
Background: In the last decades, mesoporous silica nanoparticles (MSN) are improved for drug delivery, imaging, and biomedical applications due to their special properties such as large surface area, high drug loading capacity, tunable pore size, and modification of surface area by functional groups. Objectives: The aim of this study was to evaluate MSNs as carriers for oral colon-specific and...
متن کاملAn Investigation on the Adsorption Behavior of a Mesoporous Silica Synthesized by a Surfactant-assisted Method in an Acidic Media
Mesoporous SiO2 nanopowder was synthesized under an acidic condition by a sol-gel method using various amounts of cetyltrimethyl ammonium bromide (CTAB) as structure directing agent. The samples were investigated with XRD, SEM, FTIR, TEM and N2 absorption-desorption analysis. Also, the incremental effect of surfactant were examined. The results obtained from the analysis suggested that an incre...
متن کاملDissolution of Mesoporous Silica Supports in Aqueous Solutions: Implications for Mesoporous Silica-based Water Treatment Processes.
Under pH 7 - 10 conditions, the mesoporous silica supports proposed for use in water treatment are relatively unstable. In batch experiments conducted in pH 7 solutions, the commonly used support SBA-15 dissolved quickly, releasing approximately 30 mg/L of dissolved silica after 2 hours. In column experiments, more than 45% of an initial mass of 0.25 g SBA-15 dissolved within 2 days when a pH 8...
متن کاملSmart Corrosion Inhibition of Mild Steel Using Mesoporous Silica Nanocontainers Loaded with Molybdate
In this research, mesoporous silica was served as the host of molybdate (corrosion inhibitor). The loaded mesoporous silica was dispersed in a paint matrix. The composite was then coated on the carbon steel surface. Polarization and electrochemical impedance spectroscopy (EIS) tests showed that the corrosion resistance of the scratched paint containing molybdate loaded mesoporous silica ...
متن کاملTemplate-derived carbon: an unexpected promoter for the creation of strong basicity on mesoporous silica.
Template-derived carbon is demonstrated to effectively promote the creation of strong basicity on mesoporous silica, for the first time. New materials owning ordered mesoporous structure, strong basicity, and excellent catalytic activity are thus successfully constructed at low temperatures, which are impossible to achieve using conventional methods.
متن کامل