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Confinement-driven radical change in a sequence of rotator phases: a study on n-octacosane

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Abstract

Rotator-phase forming n-alkanes have been studied extensively in both their bulk state and in nanoconfinement. While some alkanes maintain their bulk-state rotator phases in nanoconfinement albeit with increased disorder, there are others exhibiting new rotator phases upon confinement. We present here a temperature dependent X-ray diffraction (XRD) and differential scanning calorimetric (DSC) study on n-octacosane (C28H58), which almost completely loses its bulk state RIV phase and undergoes complete disappearance of its RIII phase. In their place, when confined in cylindrical anodized alumina nanopores, a phase highly resembling the hexatic mesophase is formed at a higher temperature and the RI rotator phase at a lower temperature. The effects of finite size, interfacial interactions with the host matrix and alkyl chain flexibility are used to provide an explanation for such unexpected behaviour.

Graphical abstract: Confinement-driven radical change in a sequence of rotator phases: a study on n-octacosane

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Publication details

The article was received on 07 Jun 2018, accepted on 29 Aug 2018 and first published on 30 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP03603A
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Confinement-driven radical change in a sequence of rotator phases: a study on n-octacosane

    S. Dutta and S. K. Prasad, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP03603A

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