+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

In situ synchrotron small-angle X-ray scattering/X-ray diffraction study of the formation of SBA-15 mesoporous silica

In situ synchrotron small-angle X-ray scattering/X-ray diffraction study of the formation of SBA-15 mesoporous silica

Langmuir 20(12): 4885-4891

The initial stages of the formation of SBA-15 have been studied by in situ SAXS/XRD using synchrotron radiation. Modeling of both the diffuse scattering and the X-ray diffraction patterns obtained at different stages of the reaction results in a detailed description of the different reaction steps. The first step in the formation is the liquid-liquid phase separation of spherical P123-silicate hybrid micelles after which nucleation and growth of the 2D hexagonal phase occurs. Two-dimensional electron density maps calculated on the basis of the intensities of the Bragg reflections suggest that changes in the degree of intermicellar condensation are responsible for the time-dependent observations. The silica source (alkoxysilanes) may be partially unhydrolyzed long after formation of the hexagonal structure, since the kinetics of the mesophase evolution is notably slower when TEOS is used as the silica precursor as compared to TMOS. The results obtained for SBA-15 are compared with other published data on the formation ofSBA-15 and of the smaller pore MCM-41 materials.

Please choose payment method:

(PDF emailed within 1 workday: $29.90)

Accession: 049314109

Download citation: RISBibTeXText

PMID: 15984246

Related references

In situ synchrotron study of phase transformation behaviors in bulk metallic glass by simultaneous diffraction and small angle scattering. Physical Review Letters 91(26 Pt 1): 265501, 2003

In situ small-angle neutron scattering study of nitrogen adsorption and condensation in mesoporous silica glass CPG-10-75. Journal of Colloid and Interface Science 296(1): 256-262, 2006

The role played by salts in the formation of SBA-15, an in situ small-angle X-ray scattering/diffraction study. Langmuir 27(11): 7121-7131, 2011

A New Insight into Growth Mechanism and Kinetics of Mesoporous Silica Nanoparticles by in Situ Small Angle X-ray Scattering. Langmuir 31(30): 8478-8487, 2015

Time-resolved in situ small-angle X-ray scattering study of silica particle formation in nonionic water-in-oil microemulsions. Langmuir 24(10): 5225-5228, 2008

Adsorption in periodically ordered mesoporous organosilica materials studied by in situ small-angle X-ray scattering and small-angle neutron scattering. Langmuir 26(9): 6583-6592, 2010

Study of mesoporous silica materials by small angle x-ray scattering. Chinese Physics 10(5): 429-432, 2001

In Situ Small-Angle X-ray Scattering Investigation of the Formation of Dual-Mesoporous Materials. Chemphyschem 16(17): 3637-3641, 2015

Detection of homogeneous distribution of functional groups in mesoporous silica by small angle neutron scattering and in situ adsorption of nitrogen or water. Langmuir 27(9): 5516-5522, 2011

Analysis of microporosity in ordered mesoporous hierarchically structured silica by combining physisorption with in situ small-angle scattering (SAXS and SANS). Langmuir 25(21): 12670-12681, 2009

Preparation and characterization - including in situ Small Angle X-Ray Scattering - of gas chromatographic capillary columns with mesoporous silica thin films as stationary phases. Journal of Chromatography. a 1413: 85-93, 2015

Influence of local anesthetics on the phosphatidylcholine model membrane: small-angle synchrotron X-ray diffraction and neutron scattering study. Biophysical Chemistry 109(3): 361-373, 2004

Order and orientation control of mesoporous silica films on conducting gold substrates formed by dip-coating and self-assembly: a grazing angle of incidence small-angle X-ray scattering and field emission scanning electron microscopy study. Langmuir 21(22): 10112, 2005

A structural study of an organogel investigated by small-angle neutron scattering and synchrotron small-angle X-ray scattering. Journal of Physical Chemistry. B 116(26): 7739-7745, 2012

Using in situ synchrotron radiation wide angle X-ray scattering (WAXS) to study CaCO3 scale formation at ambient and elevated temperature. Faraday Discussions 136: 355, 2007