Small-angle X-ray scattering analysis of porous powders of CaCO<sub>3</sub>

Panduro, Elvia Anabela Chavez; Beuvier, Thomas; Martínez, Manuel Fernández; Hassani, Leila; Calvignac, Brice; Boury, Frank; Gibaud, Alain

doi:10.1107/s0021889812032219

Cited by 40 publications

(30 citation statements)

References 19 publications

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“…S and V are the total surface area and total volume seen by a neutron or X-ray beam, respectively. Many experimental systems show clear Porod’s law scattering patterns 21 , 27 – 30 that can be measured by either small-angle neutron scattering (SANS) or small-angle X-ray scattering. Even though the conventional Porod’s law has been widely applied to porous systems to determine the average SLD and the total surface area, it cannot provide any information of the variation of SLD in pore surfaces that is closely linked to the variation of compositional properties of pore matrix.…”

Section: Resultsmentioning

confidence: 99%

A non-invasive method to directly quantify surface heterogeneity of porous materials

et al. 2018

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It is extremely challenging to measure the variation of pore surface properties in complex porous systems even though many porous materials have widely differing pore surface properties at microscopic levels. The surface heterogeneity results in different adsorption/desorption behaviors and storage capacity of guest molecules in pores. Built upon the conventional Porod’s law scattering theory applicable mainly to porous materials with relatively homogeneous matrices, here we develop a generalized Porod’s scattering law method (GPSLM) to study heterogeneous porous materials and directly obtain the variation of scattering length density (SLD) of pore surfaces. As SLD is a function of the chemical formula and density of the matrix, the non-invasive GPSLM provides a way to probe surface compositional heterogeneity, and can be applied to a wide range of heterogeneous materials especially, but not limited to, porous media and colloids, using either neutron or X-ray scattering techniques.

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Section: Resultsmentioning

confidence: 99%

A non-invasive method to directly quantify surface heterogeneity of porous materials

et al. 2018

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“…It is worth pointing out in some special cases [39,41] Case 4 ( Fig. 1(e)) is similar to Case 3 except that the domains have different volume fractions of the tiny pores accessible to guest fluid, ( ).…”

Section: [mentioning

confidence: 83%

Investigation of porous materials with large surface heterogeneity using the generalized Porod's scattering law method

2019

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Surface heterogeneity is ubiquitous in both natural and man-made materials, and can significantly influences material properties. However, it is very challenging to non-invasively probe the variation of surface properties in porous materials. Recently, we have proposed a new method, Generalized Porod's Scattering Law Method (GPSLM), to obtain the surface heterogeneity information in bulk porous materials by extending the classic Porod's scattering method. However, it was not clear if the GPSLM can be applied to other more complex materials, such as porous materials with dead pores, i.e. pores that guest fluid molecules cannot access, or porous materials whose solid matrix can adsorb small guest molecules. In this paper, we theoretically extend the GPSLM to study those more complex situations. For all five cases with different levels of complexity discussed in this work, the scattering intensity at the Porod's law region always follows a parabolic function of scattering length density (SLD) of the guest fluid. Moreover, the minimum value of the scattering intensity is all related to the surface heterogeneity of the porous materials. 2The SLD of the guest fluid at which the minimum intensity is reached is always related to the surface-averaged SLD of materials. We also discuss the potential limitations and possible future applications of the GPSLM. As the GPSLM is based on the contrast variation method commonly used for a wide range of materials, such as geological materials, biomaterials, and colloidal suspensions, the theoretical development here is potentially useful for researchers who would like to apply the GPSLM to more complicated materials besides porous materials. I.

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“…The scattering curves analysis gives information on the scattering objects at the level of their fractal dimension as well as an estimation of the pores size at the inner interface in real space. 27 Figure 5 shows the SAXS diffractograms of P and NP hydrogels and of the corresponding composites prepared by rapidly mixing of CaCl 2 and Na 2 CO 3 (method M1).…”

Section: Resultsmentioning

confidence: 99%

Composite materials based on poly(N-isopropylacrylamide-co-methacrylic acid) hydrogels and calcium carbonate

Doroftei

Mihai

Săcărescu

et al. 2015

High Performance Polymers

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The synthesis of complex functional materials with thermo-and pH-sensitive tunable properties based on poly(N-isopropylacrylamide-co-methacrylic acid) hydrogels with different porosities and pH-sensitive and biocompatible calcium carbonate (CaCO 3 ) was investigated. To control the composites characteristics, two hydrogles with the same chemical composition but different porosities were used, as well as different methods for crystal growth, namely, the adding protocol of inorganic partners (rapid mixing or alternate dipping) or the carbonate source. The morphology of the new composites was investigated by scanning electron microscopy and the polymorphs content by Fourier transform infrared spectroscopy, as compared to unmodified hydrogels. Information on the interface between organic/inorganic materials, the radii of gyration of the scattering objects, their fractal dimension, and CaCO 3 porosity characteristics were obtained by small-angle X-ray scattering.

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Small-angle X-ray scattering analysis of porous powders of CaCO₃

Cited by 40 publications

References 19 publications

A non-invasive method to directly quantify surface heterogeneity of porous materials

A non-invasive method to directly quantify surface heterogeneity of porous materials

Investigation of porous materials with large surface heterogeneity using the generalized Porod's scattering law method

Composite materials based on poly(N-isopropylacrylamide-co-methacrylic acid) hydrogels and calcium carbonate

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Small-angle X-ray scattering analysis of porous powders of CaCO3

Cited by 40 publications

References 19 publications

A non-invasive method to directly quantify surface heterogeneity of porous materials

A non-invasive method to directly quantify surface heterogeneity of porous materials

Investigation of porous materials with large surface heterogeneity using the generalized Porod's scattering law method

Composite materials based on poly(N-isopropylacrylamide-co-methacrylic acid) hydrogels and calcium carbonate

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Small-angle X-ray scattering analysis of porous powders of CaCO₃