scholarly journals Small-angle scattering investigation of silica xerogels and sonogels prepared with ionic liquid pyridinium tetrafluoroborate

2017 ◽  
Vol 11 (3) ◽  
pp. 229-233 ◽  
Author(s):  
László Almásy ◽  
Ana-Maria Putz ◽  
Adél Len ◽  
Josef Plestil ◽  
Cecilia Savii
Keyword(s):  
Ionic Liquid ◽  
Small Angle ◽  
Sol Gel ◽  
Molar Ratio ◽  
Strong Increase ◽  
Silica Xerogels ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Gel Processing ◽  
Functionalized Alkoxide

Silica matrices were prepared via acid catalysed sol-gel processing augmented with sonocatalysis. As silica precursors, a mixture of tetra-functionalized alkoxide (TMOS) and three-functionalized alkoxide methyl-trimethoxysilane (MTMS) were employed. Ionic liquid N-butyl-3-methylpyridinium tetrafluoroborate ([bmPy][BF4]), was used in various proportions, aiming to catalyse the sol-gel reactions, and to influence the mesoporous silica materials properties, serving as pore template. Small-angle neutron (SANS) and small-angle X-ray scattering (SAXS) techniques were used to explore the xerogels and sonogels microstructure evolution as a function of the IL/Si molar ratio. The results show a strong increase of the primary particle size under the influence of the ionic liquid. Ultrasonic agitation leads to further size increase by ca. 10%.

SLADS: a parallel code for direct simulations of scattering of large anisotropic dense nanoparticle systems

2017 ◽  
Vol 50 (3) ◽  
pp. 951-958 ◽  
Author(s):  
Sen Chen ◽  
Juncheng E ◽  
Sheng-Nian Luo
Keyword(s):  
Analytical Solutions ◽  
Small Angle ◽  
Real Space ◽  
Small Angle Scattering ◽  
Two Dimensional ◽  
X Ray ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Parallel Code ◽  
Diffraction Patterns

SLADS(http://www.pims.ac.cn/Resources.html), a parallel code for direct simulations of X-ray scattering of large anisotropic dense nanoparticle systems of arbitrary species and atomic configurations, is presented. Particles can be of arbitrary shapes and dispersities, and interactions between particles are considered. Parallelization is achieved in real space for the sake of memory limitation. The system sizes attempted are up to one billion atoms, and particle concentrations in dense systems up to 0.36. Anisotropy is explored in terms of superlattices. One- and two-dimensional small-angle scattering or diffraction patterns are obtained.SLADSis validated self-consistently or against cases with analytical solutions.

scholarly journals Hierarchically organized materials with ordered mesopores: adsorption isotherm and adsorption-induced deformation from small-angle scattering

2020 ◽  
Vol 22 (22) ◽  
pp. 12713-12723 ◽  
Author(s):  
Lukas Ludescher ◽  
Roland Morak ◽  
Stephan Braxmeier ◽  
Florian Putz ◽  
Nicola Hüsing ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Small Angle ◽  
Small Angle Scattering ◽  
Scattering Data ◽  
X Ray ◽  
Hierarchical Porosity ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Apparent Strain ◽  
Ordered Mesopores

Apparent strain artifacts resulting from the evaluation of small-angle X-ray scattering data superimpose the actual adsorption induced deformation in silica with hierarchical porosity. These artifacts can be corrected for by detailed modelling.

scholarly journals A dilute gold nanoparticle suspension as small-angle X-ray scattering standard for an absolute scale using an extended Guinier approximation

2019 ◽  
Vol 52 (2) ◽  
pp. 344-350 ◽  
Author(s):  
Ahmed S. A. Mohammed ◽  
Agnese Carino ◽  
Andrea Testino ◽  
Mohammad Reza Andalibi ◽  
Antonio Cervellino
Keyword(s):  
Gold Nanoparticle ◽  
Small Angle ◽  
Order Term ◽  
Absolute Intensity ◽  
Nanoparticle Suspension ◽  
X Ray ◽  
Practical Procedure ◽  
X Ray Scattering ◽  
Angle Scattering ◽  
Liquid Microjets

In this article, a practical procedure for absolute intensity calibration for small-angle scattering (SAXS) studies on liquid microjets is established. A gold nanoparticle suspension is used as standard so that the intercept at Q = 0 of the SAXS scattering curve provides a scaling reference. In order to obtain the most precise extrapolation at Q = 0, an extension of the Guinier approximation has been used, with a second-order term in the fit that adapts to a larger Q range.

Time-resolved small angle X-ray scattering study of sol–gel precursor solutions of lead zirconate titanate and zirconia

2012 ◽  
Vol 369 (1) ◽  
pp. 184-192 ◽  
Author(s):  
Tomasz M. Stawski ◽  
Rogier Besselink ◽  
Sjoerd A. Veldhuis ◽  
Hessel L. Castricum ◽  
Dave H.A. Blank ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Small Angle ◽  
Sol Gel ◽  
Lead Zirconate ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Zirconate Titanate ◽  
Scattering Study ◽  
Ray Scattering

Studies on the Microstructure of Pure and Doped Anatase TiO2 Nanoparticles by SAXS

2013 ◽  
Vol 743-744 ◽  
pp. 831-836 ◽  
Author(s):  
Wei Mei Shi ◽  
Xiao Jun Dai ◽  
Guang Cheng Yang ◽  
Yao Xu ◽  
Yi Liu
Keyword(s):  
Photocatalytic Activity ◽  
Synchrotron Radiation ◽  
Hydrothermal Method ◽  
Rough Surface ◽  
Small Angle ◽  
Sol Gel ◽  
Negative Deviation ◽  
X Ray ◽  
X Ray Scattering ◽  
Fractal Properties

Pure TiO2, Ce-doped and Ce/Si-codoped TiO2 nanoparticles with different Ce contents were synthesized by using a sol-gel-hydrothermal method. The as-synthesized samples were annealed at 400 °C. Their crystallization was investigated by Raman spectroscope. The result showed that Ce-doping and Ce-Si codoping decreased the crystallization. The interfacial and fractal properties were investigated by synchrotron radiation small angle X-ray scattering (SAXS). The results indicated that Ce-doping induced the Porod negative deviation, and the fractal properties showed TiO2 nanoparticles codoped by Ce-Si were rougher than these of the pure TiO2 and Ce-doped TiO2. This rough surface of the nanoparticles was helpful to improve the photocatalytic activity.

Investigation of particle size distribution and aggregate structure of various ferrofluids by small-angle scattering experiments

1999 ◽  
Vol 32 (2) ◽  
pp. 273-280 ◽  
Author(s):  
Dietmar Eberbeck ◽  
Jürgen Bläsing
Keyword(s):  
Surface Layer ◽  
Small Angle ◽  
Scattering Data ◽  
Two Phase ◽  
Carrier Liquid ◽  
X Ray Scattering ◽  
Low Concentrations ◽  
Angle Scattering ◽  
Size Dispersion ◽  
Surface Layer Thickness

The size and the size dispersion of the composite particles of ferrofluids were determined assuming a lognormal distribution of core radii. Small-angle X-ray scattering data were fitted by the theoretical scattering function of two-phase spheres. Reliable results were obtained, because the scattering share of the surface layer can be taken into account. The particles aggregate at high as well as very low concentrations. After freezing of the carrier liquid, the particles within the clusters come together tightly. The measured minimal particle distance gives information about the effective surface-layer thickness. Two types of aggregates, namely compact clusters and extended net-like aggregates, were distinct in middle length scales.

scholarly journals The role of the ionic liquid C6C1ImTFSI in the sol–gel synthesis of silica studied using in situ SAXS and Raman spectroscopy

2015 ◽  
Vol 17 (15) ◽  
pp. 9841-9848 ◽  
Author(s):  
Moheb Nayeri ◽  
Kim Nygård ◽  
Maths Karlsson ◽  
Manuel Maréchal ◽  
Manfred Burghammer ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Ionic Liquid ◽  
Sol Gel ◽  
Chemical Changes ◽  
X Ray ◽  
X Ray Scattering ◽  
Sol Gel Synthesis ◽  
Ray Scattering

Structural and chemical changes during the sol–gel synthesis of silica using an ionic liquid are investigatedin situand simultaneously by X-ray scattering and μ-Raman spectroscopy.

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