Modeling the Impact of Mesoporous Silica Microstructures on the Adsorption Hysteresis Loop

2020 ◽  
Vol 124 (39) ◽  
pp. 21646-21655
Author(s):  
Artur Svidrytski ◽  
Dzmitry Hlushkou ◽  
Matthias Thommes ◽  
Peter A. Monson ◽  
Ulrich Tallarek
Keyword(s):  
Mesoporous Silica ◽  
Hysteresis Loop ◽  
Adsorption Hysteresis ◽  
The Impact

scholarly journals Are Biogenic and Pyrogenic Mesoporous SiO2 Nanoparticles Safe for Normal Cells?

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1427
Author(s):  
Katarzyna Solarska-Ściuk ◽  
Kinga Adach ◽  
Sylwia Cyboran-Mikołajczyk ◽  
Dorota Bonarska-Kujawa ◽  
Agnieszka Rusak ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Biological Effects ◽  
Mesoporous Silica Nanoparticles ◽  
Volume Ratio ◽  
Sio2 Nanoparticles ◽  
Amorphous Structure ◽  
Intracellular Ros ◽  
Materials Used ◽  
The Impact

Silicon dioxide, in the form of nanoparticles, possesses unique physicochemical properties (size, shape, and a large surface to volume ratio). Therefore, it is one of the most promising materials used in biomedicine. In this paper, we compare the biological effects of both mesoporous silica nanoparticles extracted from Urtica dioica L. and pyrogenic material. Both SEM and TEM investigations confirmed the size range of tested nanoparticles was between 6 and 20 nanometers and their amorphous structure. The cytotoxic activity of the compounds and intracellular ROS were determined in relation to cells HMEC-1 and erythrocytes. The cytotoxic effects of SiO2 NPs were determined after exposure to different concentrations and three periods of incubation. The same effects for endothelial cells were tested under the same range of concentrations but after 2 and 24 h of exposure to erythrocytes. The cell viability was measured using spectrophotometric and fluorimetric assays, and the impact of the nanoparticles on the level of intracellular ROS. The obtained results indicated that bioSiO2 NPs, present higher toxicity than pyrogenic NPs and have a higher influence on ROS production. Mesoporous silica nanoparticles show good hemocompatibility but after a 24 h incubation of erythrocytes with silica, the increase in hemolysis process, the decrease in osmotic resistance of red blood cells, and shape of erythrocytes changed were observed.

Influence of the surface limiting elasticity modulus on the impact behavior of droplets of difenoconazole-loaded mesoporous silica nanoparticles with associated SDS

Soft Matter ◽  
2018 ◽  
Vol 14 (29) ◽  
pp. 6070-6075 ◽  
Author(s):  
Chong Cao ◽  
Zhao-Lu Zhou ◽  
Li-Dong Cao ◽  
Li Zheng ◽  
Jun Xu ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Elasticity Modulus ◽  
Mesoporous Silica Nanoparticles ◽  
Impact Behavior ◽  
The Impact

As the limiting elasticity modulus increases, the first returning height of the bouncing drop increases.

scholarly journals On the Support Effect and the Cr Promotion of Co Based Catalysts for the Acetic Acid Steam Reforming

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 133
Author(s):  
Marta Cortese ◽  
Concetta Ruocco ◽  
Vincenzo Palma ◽  
Pedro J. Megía ◽  
Alicia Carrero ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Mesoporous Silica ◽  
Steam Reforming ◽  
Supported Catalysts ◽  
Support Effect ◽  
The Other ◽  
Hexagonal Mesoporous Silica ◽  
Chromium Addition ◽  
Cr Addition ◽  
The Impact

This work focuses on the support effect of the performances of Co based catalysts for acetic acid steam reforming. SBA-15, a well ordered hexagonal mesoporous silica structure, and CeO2 have been selected as the supports, with the impact of chromium addition also being investigated. Better acetic acid steam reforming performances have been recorded for CeO2 compared to SBA-15 supported catalysts and, in particular, the 7Co/CeO2 catalyst showed the highest values of acetic acid conversions with enhanced H2 yields below 480 °C, in comparison to the other investigated catalytic formulations. In addition, more pronounced coke depositions and acetone concentrations have been obtained with CeO2 supported catalysts, due to the tendency of ceria to catalyse the ketonization reaction. Chromium addition to Co/SBA-15 catalysts led to an enhancement in the activity towards acetic acid steam reforming, while on CeO2 supported catalysts no improvement in the catalysts’ activity was observed. However, on both SBA-15 and CeO2 supported catalysts, Cr addition reduced the amount of coke deposited on the catalysts surface.

The impact of framework organic functional groups on the hydrophobicity and overall stability of mesoporous silica materials

2012 ◽  
Vol 132 (2-3) ◽  
pp. 1077-1088 ◽  
Author(s):  
Geert Smeulders ◽  
Vera Meynen ◽  
Ana Silvestre-Albero ◽  
Kristof Houthoofd ◽  
Myrjam Mertens ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Functional Groups ◽  
Organic Functional Groups ◽  
Silica Materials ◽  
Overall Stability ◽  
Mesoporous Silica Materials ◽  
The Impact

Reversible and Switching Parts of Polarization in PZT Films

1999 ◽  
Vol 596 ◽  
Author(s):  
Vladimir Petrovsky ◽  
Harlan U. Anderson ◽  
Tatiana Petrovsky ◽  
Alexander Grishin
Keyword(s):  
Space Charge ◽  
Hysteresis Loop ◽  
Charge Distribution ◽  
Domain Structure ◽  
Remanent Polarization ◽  
Polarization State ◽  
Theoretical Limit ◽  
Pzt Films ◽  
Space Charge Distribution ◽  
The Impact

AbstractA pulsing technique was used for more detailed investigation of the switching process in ferroelectric PZT films. This technique allows for the separation of the switching and reversible parts of the polarization and an estimation of the impact of the different effects in the hysteresis loop such as domain structure, depolarizing field and space charge distribution. It is shown that it is possible to provide nondestructive readout of the information stored as the polarization state by measuring the nonlinearity of the reversible polarization. Theoretical limit for the nondestructive readout signal is 20% of the remanent polarization in the differential regime and 12% in the direct regime. The experimental value of the signal is 10% in the both regimes and does not depend on time or the number of readings.

Encapsulation of Luminescent Silicon Nanocrystals within Mesoporous Silica Nanospheres: Synthesis and Effect on Photoluminescence

2011 ◽  
Vol 1359 ◽  
Author(s):  
Sarah Regli ◽  
Joel A. Kelly ◽  
Jonathan G.C. Veinot
Keyword(s):  
Mesoporous Silica ◽  
Silicon Nanocrystals ◽  
Blue Shift ◽  
Silica Nanospheres ◽  
Significant Research ◽  
Biomedical Technologies ◽  
Encapsulation Process ◽  
Promising Application ◽  
The Impact ◽  
Mesoporous Silica Nanospheres

ABSTRACTSilicon nanocrystals (Si-NCs) are of significant research interest owing to their quantum confined photoluminescent (PL) properties and biological inertness. A promising application of these NCs is as the luminescent component in multifunctional biomedical technologies. In this report, we demonstrate the encapsulation of alkyl terminated Si-NCs within a mesoporous silica shell as a multifunctional imaging and drug delivery architecture. The Si-NC concentration was found to critically impact the nanoshell morphology. The impact of the encapsulation process on the Si-NC PL was studied, showing a blue-shift and decrease in intensity attributed to the oxidation of Si-NCs under basic conditions.

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