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Issue 39, 2013
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Mesoscale phenomena in solutions of 3-methylpyridine, heavy water, and an antagonistic salt

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Abstract

We have investigated controversial issues regarding the mesoscale behavior of 3-methylpyridine (3MP), heavy water, and sodium tetraphenylborate (NaBPh4) solutions by combining results obtained from dynamic light scattering (DLS) and small-angle neutron scattering (SANS). We have addressed three questions: (i) what is the origin of the mesoscale inhomogeneities (order of 100 nm in size) manifested by the “slow mode” in DLS? (ii) Is the periodic structure observed from SANS an inherent property of this system? (iii) What is the universality class of critical behavior in this system? Our results confirm that the “slow mode” observed from DLS experiments corresponds to long-lived, highly stable mesoscale droplets (order of 100 nm in size), which occur only when the solute (3MP) is contaminated by hydrophobic impurities. SANS data confirm the presence of a periodic structure with a periodicity of about 10 nm. This periodic structure cannot be eliminated by nanopore filtration and thus is indeed an inherent solution property. The critical behavior of this system, in the range of concentration and temperatures investigated by DLS experiments, indicates that the criticality belongs to the universality class of the 3-dimensional Ising model.

Graphical abstract: Mesoscale phenomena in solutions of 3-methylpyridine, heavy water, and an antagonistic salt

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Publication details

The article was received on 16 Jun 2013, accepted on 02 Aug 2013 and first published on 22 Aug 2013


Article type: Paper
DOI: 10.1039/C3SM51662H
Citation: Soft Matter, 2013,9, 9326-9334
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    Mesoscale phenomena in solutions of 3-methylpyridine, heavy water, and an antagonistic salt

    J. Leys, D. Subramanian, E. Rodezno, B. Hammouda and M. A. Anisimov, Soft Matter, 2013, 9, 9326
    DOI: 10.1039/C3SM51662H

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