Browsing by Author "Lang, EA"

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    An in situ rapid heat-quench cell for small-angle neutron scattering
    (Institute of Physics, 2008-06) Pullen, SA; Gilbert, EP; Olsen, SR; Lang, EA; Doolan, KR
    A dual-temperature sample environment has been developed enabling the rapid heating and quenching of samples in situ for small-angle neutron scattering (SANS). The rapid heat and quench cell (RHQC) allows samples to be rapidly heated up to 600 K and then quenched to 150 K, or vice versa, in a single shot or cycle mode, with the sample in position for data collection. Measured cooling rates of up to 11 K s-1 and heating rates up to 19 K s-1 have been recorded during the testing stages. First results using the RHQC on a hydrogenated/deuterated paraffin blend quenched from the melt illustrate the value of the device in accessing the early stage phase separation kinetics with SANS. © 2008, Institute of Physics
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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.