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Gelling Lamellar Phases of the Binary System Water–Didodecyldimethylammonium Bromide with an Organogelator
journal contribution
posted on 2017-10-13, 16:50 authored by Sachi Koitani, Sonja Dieterich, Natalie Preisig, Kenji Aramaki, Cosima StubenrauchDoes the presence of a gel network
influence the properties of
a lyotropic liquid crystal? Does the replacement of oil by a lyotropic
liquid crystal influence the properties of an organogel? To answer
these questions we study gelled lyotropic liquid crystals (LLC). In
the present study we show that it is possible to gel the lamellar
phase of the binary system water–didodecyl dimethylammonium
bromide (2C12DAB) with the organogelator 12-hydroxyoctadecanoic
acid (12-HOA). We compare various properties of the gelled LLC phases
with the “parent systems”, i.e., with the binary organogel
consisting of n-decane–12-HOA and with the
nongelled LC phases, respectively. Optical and electron microscopy,
differential scanning calorimetry (DSC), rheometry, as well as small
and wide-angle X-ray scattering (SWAXS) proved the coexistence of
an Lα phase and a 12-HOA gel network in the gelled
Lα phase. However, a small influence of the Lα phase on the gel properties was seen, namely slightly
lower sol–gel transition temperatures and viscoelastic moduli
of the gelled Lα phase compared to the binary gel.
On the other hand, the presence of the gel also has an influence on
the Lα phase: the interlayer spacing of the surfactant
bilayers in the gelled Lα phases is slightly larger
compared to the nongelled Lα phases, which is due
to mixing part of the 12-HOA molecules in the Lα bilayers.
Despite this mutual influence the structures of both the Lα phase and the gel network are hardly disturbed in the gelled Lα phase, i.e., that the self-assembly of the surfactant
and of the gelator molecules clearly occur in an orthogonal way.
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L α phase12- HOA moleculeselectron microscopyL α bilayersnongelled LC phaseswide-angle X-rayinterlayer spacingsurfactant bilayersgel propertiesgel network influenceorthogonal waygelled L α phasesgel networkDSClamellar phaseGelling Lamellar Phasesscanning calorimetrygelled L α phase12- HOA gel networkgelator moleculesstudy gelled lyotropicDABSWAXScrystal influencegelled LLC phasesnongelled L α phases
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