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Authors
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A. Vyalikh, Th. Emmler, E. Gedat, I. Shenderovich, G. H. Findenegg, H.-H. Limbach, and G. Buntkowsky
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Title
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Evidence of the microphase separation in Controlled Pore Glass
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Date
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01.08.2005
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Number
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2100
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Abstract
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The phase separation of a mixture of water and isobutyric acid (iBA) confined in the pore space of Controlled Pore Glass (CPG) 10-75 has been studied by 1H NMR relaxometry and 1H-pulsed field gradient (PFG) diffusion measurements. For an acid-rich mixture (mass fraction 54 wt% iBA), evidence of a phase separation process in the pores was obtained, which occurs in a temperature window between 32 and 39 °C, as indicated in the PFG data by an anomalous temperature dependence of the diffusion coefficient and in the relaxation data by a bi-exponential magnetization decay. The phase separation temperature of the mixture in the pore is slightly lower than in the bulk mixture of the same composition (41 °C) and extends over a finite temperature range. A qualitative model of the phase separation process in the pores is developed, which assumes a temperature-dependent domain-like structure of the liquid below the phase transition temperature and a breakdown of these domains upon reaching the transition temperature.
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Publisher
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Solid State Nuclear Magnetic Resonance
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Wikidata
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Citation
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Solid State Nuclear Magnetic Resonance 28 (2005) 117-124
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DOI
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https://doi.org/10.1016/j.ssnmr.2005.07.001
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Tags
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