Browsing by Author "Martin, C"

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    Phase separation in the organic solid state: simultaneous synchrotron SAXS / DSC studies of unstable n-alkane blends
    (Australian Institute of Physics, 2005-01-31) Gilbert, EP; Nelson, A; Sutton, D; Terrill, N; Martin, C; Lal, J; Lang, EA
    Blends of normal alkanes form lamellar structures, when quenched from the melt, in which the separation of the individual chains may be controlled by the chain-length difference, molar composition, isotopic substitution and confinement. We have performed simultaneous synchrotron small-angle X-ray scattering and differential scanning calorimetry studies on 2:1 C28H58:C36D74 mixtures as a function of cooling protocol. Their simultaneous collection enables the temperature-dependent nanostructural changes to be correlated with phase transitions. The data are further complemented by small-angle neutron scattering highlighting the separation of the individual chains via isotopic contrast and optical microscopy indicating changes occurring on the macroscopic scale.
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    Phase separation in the organic solid state: the influence of quenching protocol in unstable n-alkane blends
    (Taylor & Francis, 2005-08-31) Gilbert, EP; Nelson, ARJ; Sutton, D; Terrill, N; Martin, C; Lal, J; Lang, E
    Blends of normal alkanes form lamellar structures, when quenched from the melt, in which the separation of the individual chains may be controlled by the chain-length mismatch, molar composition, isotopic substitution and confinement. 2:1 C28H58:C36D74 mixtures have been investigated after subjection to a cooling rate varying over three orders of magnitude and intermediate annealing prior to reaching ambient. Quenching at 100°C/min yields similar behaviour to intermediate annealing between the pure components' melting points. Slow cooling at 0.1°C/min generates significantly greater ordering and behaviour comparable to that obtained from annealing mid-way between the mixing transition and the C28H 58 melting point. © 20u25Informa UK Limited