Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 532615
Title Sign Switch of Gaussian Bending Modulus for Microemulsions : A Self-Consistent Field Analysis Exploring Scale Invariant Curvature Energies
Author(s) Varadharajan, Ramanathan; Leermakers, Frans A.M.
Source Physical Review Letters 120 (2018)2. - ISSN 0031-9007
DOI http://dx.doi.org/10.1103/PhysRevLett.120.028003
Department(s) Physical Chemistry and Soft Matter
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2018
Availibility Full text available from 2019-01-12
Abstract Bending rigidities of tensionless balanced liquid-liquid interfaces as occurring in microemulsions are predicted using self-consistent field theory for molecularly inhomogeneous systems. Considering geometries with scale invariant curvature energies gives unambiguous bending rigidities for systems with fixed chemical potentials: the minimal surface Im3m cubic phase is used to find the Gaussian bending rigidity κ̄, and a torus with Willmore energy W=2π2 allows for direct evaluation of the mean bending modulus κ. Consistent with this, the spherical droplet gives access to 2κ+κ̄. We observe that κ̄ tends to be negative for strong segregation and positive for weak segregation, a finding which is instrumental for understanding phase transitions from a lamellar to a spongelike microemulsion. Invariably, κ remains positive and increases with increasing strength of segregation.
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