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- W2516893314 abstract "As an important and interesting question, the delicate influence of confinement effect on properties of fluids in nanopores still needs deeper understanding. To this regard, phase behaviors of normal hexadecane (n-C16H34, C16) absorbed in porous materials are investigated. Phase transitions of C16 in SBA-15 (7.8 and 17.2 nm), CPG (8.1 and 300 nm), C-SBA-15 (15.6 nm) (carbon coated), and KIT-6 (8.6 nm) were scanned using differential scanning calorimetry (DSC) and temperature-dependent powder X-ray diffraction (XRD) in cooling and heating processes. The bulk C16 is known to form a transient rotator phase RI on cooling. In this work, freezing and melting points of C16 in the nanopores are found to be depressed. C16 in the large pores of CPG (300 nm) only shows a triclinic phase. In the pores of diameters d = 7.8–17.2 nm, C16 exhibits stable or metastable rotator phase RI or RII. The stabilization of the rotators by nanoconfinement is more obvious in smaller pores or with stronger pore surface interactions due to the significant contributions of interface energy of the nanosized crystals. From structural analysis, hexadecane solid in the large pores retains a complete lamellar structure, whereas the packing of molecules is heavily disturbed in the smaller pores (d < 20 nm). The phase information on the pore C16 can help understanding the influence of size effect, interface interactions and pore geometry on its physical properties." @default.
- W2516893314 created "2016-09-16" @default.
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- W2516893314 date "2015-08-03" @default.
- W2516893314 modified "2023-09-25" @default.
- W2516893314 title "Physical Control of Phase Behavior of Hexadecane in Nanopores" @default.
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- W2516893314 doi "https://doi.org/10.1021/acs.jpcc.5b03728" @default.
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