Pore Structure and Fluid Sorption in Ordered Mesoporous Silica. II. Modeling

2009 ◽  
Vol 113 (34) ◽  
pp. 15211-15217 ◽  
Author(s):  
Dirk Müter ◽  
Susanne Jähnert ◽  
John W. C. Dunlop ◽  
Gerhard H. Findenegg ◽  
Oskar Paris
Keyword(s):  
Mesoporous Silica ◽  
Pore Structure ◽  
Ordered Mesoporous Silica ◽  
Ordered Mesoporous

scholarly journals Deformation of Ordered Mesoporous Silica Structures on Exposure to High Temperatures

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
John B. Lowe ◽  
Richard T. Baker
Keyword(s):  
Mesoporous Silica ◽  
Pore Structure ◽  
High Temperatures ◽  
Elevated Temperatures ◽  
Ordered Mesoporous Silica ◽  
Large Cage ◽  
Pore Structures ◽  
Ordered Mesoporous ◽  
Pore Size Distributions ◽  
Wide Range

Ordered mesoporous silica materials are of interest for a wide range of applications. In many of these, elevated temperatures are used either in the preparation of the material or during its use. Therefore, an understanding of the effect of high temperature treatments on these materials is desirable. In this work, a detailed structural study is performed on silicas with three representative pore structures: a 2-D hexagonal pore arrangement (SBA-15), a continuous 3D cubic bimodal pore structure (KIT-6), and a 3D large cage pore structure (FDU-12). Each silica is studied as prepared and after treatment at a series of temperatures between 300 and 900°C. Pore structures are imaged using Transmission Electron Microscopy. This technique is used in conjunction with Small-Angle X-ray Diffraction, gas physisorption, and29Si solid state Nuclear Magnetic Resonance. Using these techniques, the pore size distributions, the unit cell dimensions of the mesoporous structures, and the relative occupancy of the distinct chemical environments of Si within them are cross correlated for the three silicas and their evolution with treatment temperature is elucidated. The physical and chemical properties before, during, and after collapse of these structures at high temperatures are described as are the differences in behavior between the three silica structures.

Insights into the pore structure of KIT-6 and SBA-15 ordered mesoporous silica – recent advances by combining physical adsorption with mercury porosimetry

2016 ◽  
Vol 40 (5) ◽  
pp. 4351-4360 ◽  
Author(s):  
Rémy Guillet-Nicolas ◽  
Riaz Ahmad ◽  
Katie A. Cychosz ◽  
Freddy Kleitz ◽  
Matthias Thommes
Keyword(s):  
Mesoporous Silica ◽  
Pore Structure ◽  
Physical Adsorption ◽  
Mercury Porosimetry ◽  
Textural Properties ◽  
Ordered Mesoporous Silica ◽  
Recent Advances ◽  
Ordered Mesoporous

The first successful example of Hg porosimetry on KIT-6 silicas is demonstrated. This study provides a more thorough understanding of the textural properties of the mesostructures of KIT-6 and SBA-15 silicas.

Pore Structure and Fluid Sorption in Ordered Mesoporous Silica. I. Experimental Study by in situ Small-Angle X-ray Scattering

2009 ◽  
Vol 113 (34) ◽  
pp. 15201-15210 ◽  
Author(s):  
Susanne Jähnert ◽  
Dirk Müter ◽  
Johannes Prass ◽  
Gerald A. Zickler ◽  
Oskar Paris ◽  
...  
Keyword(s):  
Experimental Study ◽  
Mesoporous Silica ◽  
Pore Structure ◽  
Small Angle ◽  
Ordered Mesoporous Silica ◽  
X Ray ◽  
X Ray Scattering ◽  
Ordered Mesoporous ◽  
Ray Scattering

scholarly journals Pore Structure Control of Ordered Mesoporous Silica Film Using Mixed Surfactants

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Tae-Jung Ha ◽  
Hyeon-Gyoon Im ◽  
Seok-Jin Yoon ◽  
Ho Won Jang ◽  
Hyung-Ho Park
Keyword(s):  
Mesoporous Silica ◽  
Pore Structure ◽  
New Technology ◽  
Silica Film ◽  
Ordered Mesoporous Silica ◽  
X Ray Diffraction ◽  
Silica Films ◽  
Structure Control ◽  
Ordered Mesoporous ◽  
Mesoporous Silica Film

Materials with nanosized and well-arranged pores have been researched actively in order to be applied to new technology fields. Especially, mesoporous material containing various pore structures is expected to have different pore structure. To form a mixed pore structure, ordered mesoporous silica films were prepared with a mixture of surfactant; Brij-76 and P-123 block copolymer. In mixed surfactant system, mixed pore structure was observed in the region of P-123/(Brij-76 + P-123) with about 50.0 wt.% while a single pore structure was observed in regions which have large difference in ratio between Brij-76 and P-123 through the X-ray diffraction analysis. Regardless of surfactant ratio, porosity was retained almost the same. It is expected that ordered mesoporous silica film with mixed pore structure can be one of the new materials which has distinctive properties.

Direct manipulation of particle size and morphology of ordered mesoporous silica by flow synthesis

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 13331-13340 ◽  
Author(s):  
T. N. Ng ◽  
X. Q. Chen ◽  
K. L. Yeung
Keyword(s):  
Particle Size ◽  
Mesoporous Silica ◽  
Hollow Spheres ◽  
Ordered Mesoporous Silica ◽  
Direct Manipulation ◽  
Flow Synthesis ◽  
Precise Control ◽  
Ordered Mesoporous ◽  
Particle Size And Morphology ◽  
Size And Morphology

Flow-synthesis of mesoporous silica allows deliberate and precise control over the size and shapes and enables the preparation of complex microstructures (i.e., hollow spheres).

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