2012
DOI: 10.1016/j.jcis.2012.03.046
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Simulation of scattering and phase behavior around the isotropic–nematic transition of discotic particles

Abstract: The detailed study of the isotropic-nematic phase transition in a system of discotic particles of aspect ratios L/D≤0.1 presented here is relevant to a broad range of colloidal suspensions of chemically modified clay particles. Using Monte Carlo simulation techniques the equation of state, radial distribution functions, structure factors and normalized scattering intensities are calculated for each phase. The results are interpreted and related to previously reported free energy calculations [Fartaria and Swea… Show more

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Cited by 6 publications
(3 citation statements)
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“…This kind of shear alignment is referred to as an isotropic to nematic transition, where the “nematic” orientation produces constructive reflectance. While it is known that shear fields align platelets, we have not succeeded in finding a reference reporting being able to detect this phenomenon visually in room light as is illustrated in Figure . A rationalization for this paucity of earlier reports may be that dispersions of clays and other disklike materials will tend to be milky and opaque to the eye if the platelets are big enough to scatter visible light, and the marginal increase of scattering on alignment may not be so obvious, as it is in this case where the constructive reflectance is cast against an actinic (black) background.…”
Section: Resultsmentioning
confidence: 93%
“…This kind of shear alignment is referred to as an isotropic to nematic transition, where the “nematic” orientation produces constructive reflectance. While it is known that shear fields align platelets, we have not succeeded in finding a reference reporting being able to detect this phenomenon visually in room light as is illustrated in Figure . A rationalization for this paucity of earlier reports may be that dispersions of clays and other disklike materials will tend to be milky and opaque to the eye if the platelets are big enough to scatter visible light, and the marginal increase of scattering on alignment may not be so obvious, as it is in this case where the constructive reflectance is cast against an actinic (black) background.…”
Section: Resultsmentioning
confidence: 93%
“…The third notable feature is the broad peak in I(q)/F 2 (q) around q ~ 0.04 Å -1 . This is a grain-grain correlation, as it is present at roughly q = 2π/2T [43], and corresponds to grains stacked on top of one another.…”
Section: C-a-s-hmentioning
confidence: 96%
“…The compaction at 740 MPa imparts enough stress on the lamellae to break them apart and disrupts the stable 70 Å spacing structure from the powder. The heterogeneity of the compaction prevents intensity from building up at any characteristic q [43]. Further experiments based on X-ray diffraction patterns of compacted C-S-H may yield more detailed insights to the compaction mechanism.…”
Section: C-a-s-hmentioning
confidence: 99%