Small-angle neutron scattering in materials science: Recent practical applications

Melnichenko, Yuri B.; Wignall, G. D.

doi:10.1063/1.2759200

Cited by 83 publications

(32 citation statements)

References 155 publications

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“…a porous silica matrix with homogeneously distributed SC CO 2 ), is proportional to the neutron contrast between SiO 2 and CO 2 molecules [33]: (10.17) predicts that for a two-phase system (e.g. porous silica matrix with homogeneously distributed CO 2 molecules), the square root of I(Q) should be proportional to the fluid density I Q ð Þ 1=2 $ ρ CO2 and thus the formation of a third phase corresponding to the adsorbed fluid will result in deviations from the linear variation of I(Q) 1/2 vs. ρ CO2 .…”

Section: Silica Aerogelsmentioning

confidence: 99%

Supercritical Fluids in Confined Geometries

Melnichenko

2016

Small-Angle Scattering From Confined and Interfacial Fluids

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Understanding the influence of confinement on the structure and thermodynamic properties of supercritical fluids in pores of different surface chemistry and topology is fundamental to the successful development and optimization of the variety of technologies involving fluid-solid interactions. Adsorption behavior of supercritical fluids (SCFs) is fundamentally different from that of subcritical vapors and this chapter begins with a general description of the specifics of the supercritical adsorption. Presented examples illustrate the capability of SAS methods to deliver unique, pore-size-dependent information on the properties of supercritical CO 2 , hydrogen, methane, and other fluids confined in pores of different engineered and natural porous solids. Applications of SAS for studying pore interconnectivity and structural stability of porous materials under pressure are also discussed.

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Section: Silica Aerogelsmentioning

confidence: 99%

Supercritical Fluids in Confined Geometries

Melnichenko

2016

Small-Angle Scattering From Confined and Interfacial Fluids

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“…76Þ Equation (6.76) can be applied for determining the properties of the adsorbed phase in porous solids saturated with fluids under pressure P at a fixed temperature T [49,50], which requires calculating the invariant Z (Eq. (6.24)) of the hypothetical two-phase system (with no adsorption) at each P,T.…”

Section: Scattering Contrast and The Invariant Of A Three-phase Systemmentioning

confidence: 99%

Fundamentals of Data Analysis

Melnichenko

2016

Small-Angle Scattering From Confined and Interfacial Fluids

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The aim of SAS experiments is to extract volume-averaged information on the spatial distribution of scattering length density (neutrons) or the electron density (x-rays) in the sample from the measured differential cross section as a function of scattering vector. Correlation functions can be calculated directly from the SAS data and deliver information on the sample structure. This chapter begins with a brief description of the mathematical form and geometrical meaning of correlation functions, which enter theory of scattering from the two-phase random systems. Asymptotic behavior of scattering in the limit of low and high values of the scattering vector is considered, together with the unified scattering function, which bridges the Guinier and Porod scattering regimes. The rest of the chapter deals with the scattering theory from fractal systems and possible extension of the theory of scattering from the two-phase to multiphase systems.

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“…(1.20)-(1.22)). Thus, transmission measurements could provide important information on absolute adsorption, as well as on the average density of the adsorbed fluids in pores [8].…”

Section: Absorption and Transmission Of X-ray And Neutron Beamsmentioning

confidence: 99%