In Situ FT-IR Investigation of Etravirine Speciation in Pores of SBA-15 Ordered Mesoporous Silica Material upon Contact with Water

2013 ◽  
Vol 10 (2) ◽  
pp. 567-573 ◽  
Author(s):  
Randy Mellaerts ◽  
Elie J. Fayad ◽  
Guy Van den Mooter ◽  
Patrick Augustijns ◽  
Mickaël Rivallan ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Ordered Mesoporous Silica ◽  
Mesoporous Silica Material ◽  
Silica Material ◽  
Ordered Mesoporous ◽  
Ft Ir

Molecular organization of hydrophobic molecules and co-adsorbed water in SBA-15 ordered mesoporous silica material

2011 ◽  
Vol 13 (7) ◽  
pp. 2706-2713 ◽  
Author(s):  
Randy Mellaerts ◽  
Maarten B. J. Roeffaers ◽  
Kristof Houthoofd ◽  
Michiel Van Speybroeck ◽  
Gert De Cremer ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Adsorbed Water ◽  
Molecular Organization ◽  
Ordered Mesoporous Silica ◽  
Mesoporous Silica Material ◽  
Silica Material ◽  
Ordered Mesoporous

Synthesis of octyl-modified ordered mesoporous silica as a new nano sorbent for the removal of 2-chlorophenol from aqueous media

2012 ◽  
Vol 12 (3) ◽  
pp. 259-269 ◽  
Author(s):  
Dongmei Zhang ◽  
Zhonglin Chen ◽  
Jimin Shen ◽  
Lei Yang
Keyword(s):  
Experimental Data ◽  
Humic Acid ◽  
Ionic Strength ◽  
Mesoporous Silica ◽  
Aqueous Media ◽  
Ordered Mesoporous Silica ◽  
Desorption Process ◽  
Mesoporous Silica Material ◽  
Silica Material ◽  
Ordered Mesoporous

Adsorption of 2-chlorophenol onto octyl-modified ordered mesoporous silica material from an aqueous solution was investigated systematically using batch experiments in this study. Hexagonal mesoporous silica (HMS) owning double pore paths and OD-HMS were synthesized by using cheap sodium silicate and a non-ion surfactant C16PyCl under room temperature here and characterized by X-ray diffraction (XRD), N2 adsorption–desorption measurement, and Fourier Transform-Infrared (FT-IR). Results indicate that 2-chlorophenol adsorption is initially rapid and the adsorption process reaches a steady state after 5 min. The adsorption isotherms are well described by the Langmuir and the Freundlich models, the former being found to provide a better fit with the experimental data. The effects of temperature, pH, ionic strength, and humic acid on the adsorption are also examined. According to the experimental results, the amount of 2-chlorophenol adsorbed decreases with increases of temperature from 288 to 308 K, and pH from 2.0 to 11.0, the amount of 2-chlorophenol adsorbed increases with an increase of ionic strength from 0.001 to 0.1 mol/L. However, the amount of 2-chlorophenol adsorbed onto octyl-modified ordered mesoporous silica material shows notable difference in the presence of humic acid. The desorption process shows a reversibility of 2-chlorophenol adsorption onto octyl-modified ordered mesoporous silica material. Thermodynamic parameters such as Gibbs free energy are calculated from the experimental data at different temperatures. Based on the results, It was found that octyl-modified ordered mesoporous silica shows significant adsorption for 2-chlorophenol. This might be due to hydrophobic interaction among the octyl functional groups and 2-chlorophenol.

Fluorescence chemosensors based on functionalized SBA-15 for detection of Pb2+ in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16611-16617 ◽  
Author(s):  
Liyan Zhao ◽  
Dan Sui ◽  
Yan Wang
Keyword(s):  
Mesoporous Silica ◽  
Aqueous Media ◽  
Ordered Mesoporous Silica ◽  
Mesoporous Silica Material ◽  
Silica Material ◽  
Ordered Mesoporous

A highly ordered mesoporous silica material (SBA-15) functionalized with 5-(4-carboxy-phenylazo)-8-hydroxyquinoline (CPA-8-HQL) for use as a fluorescence chemosensor for Pb2+ detection has been reported in this study.

Ordered Mesoporous Silica Material SBA-15: A Broad-Spectrum Formulation Platform for Poorly Soluble Drugs

2009 ◽  
Vol 98 (8) ◽  
pp. 2648-2658 ◽  
Author(s):  
Michiel Van Speybroeck ◽  
Valéry Barillaro ◽  
Thao Do Thi ◽  
Randy Mellaerts ◽  
Johan Martens ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Broad Spectrum ◽  
Ordered Mesoporous Silica ◽  
Poorly Soluble Drugs ◽  
Mesoporous Silica Material ◽  
Silica Material ◽  
Ordered Mesoporous ◽  
Poorly Soluble

scholarly journals Modelling the release of biological molecules from ordered mesoporous silica

2014 ◽  
Vol 70 (a1) ◽  
pp. C1799-C1799
Author(s):  
Francisco Mariano-Neto ◽  
Cristiano Oliveira ◽  
Márcia Fantini ◽  
Leide Cavalcanti ◽  
Osvaldo Sant'Anna
Keyword(s):  
Theoretical Model ◽  
Mesoporous Silica ◽  
Least Squares Method ◽  
Biological Molecules ◽  
Synthesis Process ◽  
Ordered Mesoporous Silica ◽  
In Situ Studies ◽  
Ordered Mesoporous ◽  
In Situ Experiments

This work reports preliminary results of the application of a theoretical model [1] in the study of incorporation and release of biological molecules from the porous structure of the SBA-15 [2] ordered mesoporous silica. A theoretical model taking into account the shape and spatial coordination of the pores in the amorphous silica structure is fitted through a non-linear least-squares method and the behavior of the parameters obtained from curves acquired in-situ during incorporation and release experiments are interpreted in the context of different media. Preliminary studies included experiments regarding the coating of the SBA-15 silica with the Eudragit® polymer and the stability of SBA-15 in experimental media (water and PBS solution) and in simulated body fluids. Small angle X-ray scattering experiments were performed mainly with bovine serum albumin (BSA) and insulin, and showed the silica's capacity of sheltering those molecules inside its structure, as well as the influence of Eudragit® on their release dynamics. In-situ experiments made during the incorporation and release of insulin helped elucidate the dynamics of those phenomena, through the reinterpretation of the theoretical model, which was originally designed to study the synthesis process of SBA-15. In this model, fit parameters were monitored during the experiment and, from their behaviors, some conclusions are drawn, such as the delay in BSA release for the SBA-15 plus Eudragit® in gastric fluid. The in-situ studies of insulin loading showed that this molecule's uptake takes place in the course of a few minutes and that it remains inside the pores. Also the in-situ studies of insulin release showed that this molecule is protected inside the silica walls, and the use of Eudragit® is, in a way, optional.

In situ formation of silver nanoparticles inside pore channels of ordered mesoporous silica

2004 ◽  
Vol 58 (16) ◽  
pp. 2152-2156 ◽  
Author(s):  
Xue-Guo Zhao ◽  
Jian-Lin Shi ◽  
Bin Hu ◽  
Ling-Xia Zhang ◽  
Zi-Le Hua
Keyword(s):  
Silver Nanoparticles ◽  
Mesoporous Silica ◽  
Ordered Mesoporous Silica ◽  
Ordered Mesoporous ◽  
In Situ Formation
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