Time-Resolved in Situ Studies of the Formation of Cubic Mesoporous Silica Formed with Triblock Copolymers

Langmuir ◽  
2004 ◽  
Vol 20 (23) ◽  
pp. 10311-10316 ◽  
Author(s):  
Katarina Flodström ◽  
Håkan Wennerström ◽  
Cilâine V. Teixeira ◽  
Heinz Amenitsch ◽  
Mika Lindén ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Triblock Copolymers ◽  
Time Resolved ◽  
In Situ Studies ◽  
Cubic Mesoporous

scholarly journals Time-resolved investigation of mesoporous silica microsphere formation using in situ heating optical microscopy

2021 ◽  
Vol 585 ◽  
pp. 118-125
Author(s):  
Andreas J. Fijneman ◽  
Jason M.J.J. Heinrichs ◽  
Stijn H.M. van Leuken ◽  
Gijsbertus de With ◽  
Heiner Friedrich
Keyword(s):  
Mesoporous Silica ◽  
Optical Microscopy ◽  
Silica Microsphere ◽  
Time Resolved ◽  
In Situ Heating

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.

Time-Resolved in Situ Studies of Oxygen Intercalation into SrCoO2.5, Performed by Neutron Diffraction and X-ray Absorption Spectroscopy

2006 ◽  
Vol 128 (40) ◽  
pp. 13161-13174 ◽  
Author(s):  
Ronan Le Toquin ◽  
Werner Paulus ◽  
Alain Cousson ◽  
Carmelo Prestipino ◽  
Carlo Lamberti
Keyword(s):  
Neutron Diffraction ◽  
Absorption Spectroscopy ◽  
Time Resolved ◽  
X Ray ◽  
In Situ Studies ◽  
Oxygen Intercalation ◽  
X Ray Absorption

In situ studies of the dehydration of zeolitic catalysts by time-resolved energy-dispersive x-ray absorption spectroscopy

1990 ◽  
Vol 94 (17) ◽  
pp. 6517-6519 ◽  
Author(s):  
J. W. Couves ◽  
J. M. Thomas ◽  
C. R. A. Catlow ◽  
G. N. Greaves ◽  
G. Baker ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Dispersive ◽  
Time Resolved ◽  
X Ray ◽  
In Situ Studies ◽  
X Ray Absorption

scholarly journals Time-resolved in situ studies on the formation mechanism of iron oxide nanoparticles using combined fast-XANES and SAXS

CrystEngComm ◽  
2015 ◽  
Vol 17 (44) ◽  
pp. 8463-8470 ◽  
Author(s):  
Anke Kabelitz ◽  
Ana Guilherme ◽  
Maike Joester ◽  
Uwe Reinholz ◽  
Martin Radtke ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Formation Mechanism ◽  
Oxide Nanoparticles ◽  
Time Resolved ◽  
In Situ Studies

The reaction of iron chlorides with an alkaline reagent is one of the most prominent methods for the synthesis of iron oxide nanoparticles.

scholarly journals Adsorption Features of Various Inorganic Materials for the Drug Removal from Water and Synthetic Urine Medium: A Multi-Technique Time-Resolved In Situ Investigation

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6196
Author(s):  
Enrico Boccaleri ◽  
Cristina Marzetti ◽  
Giorgio Celoria ◽  
Claudio Cassino ◽  
Geo Paul ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Powder Diffraction ◽  
Emerging Contaminants ◽  
Model Compound ◽  
Inorganic Materials ◽  
Ordered Mesoporous Silica ◽  
Time Resolved ◽  
X Ray ◽  
Ordered Mesoporous

Pharmaceutical active compounds, including hundreds of different substances, are counted among the emerging contaminants in waterbodies, whose presence raises a growing concern for the ecosystem. Drugs are metabolized and excreted mainly through urine as an unchanged active ingredient or in the form of metabolites. These emerging contaminants are not effectively removed with the technologies currently in use, making them a relevant environmental problem. This study proposes the treatment of urine and water at the source that can allow an easier removal of dissolved drugs and metabolites. The treatment of synthetic urine, with dissolved ibuprofen as a model compound, by adsorption, using various classes of inorganic materials, such as clays, hierarchical zeolites and ordered mesoporous silica (MCM-41), is presented. A multi-technique approach involving X-ray powder diffraction, solid-state NMR, UV-Vis and Raman spectroscopies was employed to investigate the adsorption process in inorganic adsorbents. Moreover, the uptake, the ensuing competition, the efficiency and selectivity as well as the packing of the model compound in ordered mesoporous silica during the incipient wetness impregnation process were all thoroughly monitored by a novel approach, involving combined complementary time-resolved in situ 1H and 13C MAS NMR spectroscopy as well as X-ray powder diffraction.

In situ studies of order–disorder phenomena in the synthesis of mesoporous silica

2007 ◽  
Vol 353 (52-54) ◽  
pp. 4823-4829 ◽  
Author(s):  
John P. Hanrahan ◽  
Mark P. Copley ◽  
Trevor R. Spalding ◽  
Justin D. Holmes ◽  
David C. Steytler ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
In Situ Studies
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