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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2003     Display Documents



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ID: 7017.0, MPI für Festkörperforschung / FKF Publikationen 2003
X-ray diffraction studies on mesophases of cetyl- and dodecyltrimethylammoniumbromide in liquid ammonia
Authors:Bzik, S.; Jansen, M.
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Chemistry - A European Journal
Volume:9
Issue / Number:3
Start Page:613
End Page:620
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We have studied solutions of the surfactants
cetyltrimethylammoniumbromide (CTAB) and
dodecyltrimethylammoniumbromide (DTAB) in liquid ammonia with
respect to the formation of lyotropic phases. For this purpose,
a set-up for performing X-ray scattering experiments at
temperatures up to 120degreesC on samples containing liquid
ammonia has been developed. Both systems form hexagonal and
monoclinic lyotropic phases above the dissolving temperature of
the surfactant, thus representing the first examples for
lyotropic phases in liquid ammonia, and for monoclinic phases
in nonaqueous solvents. The phase diagrams of CTAB/liquid NH3
and DTAB/liquid NH3 show similarities to their respective
aqueous systems. However, the regions of existence of
monoclinic phases are much larger in the ammonia system, while
the cubic phases, as observed in the water based systems, do
not seem to exist. The liquid-crystalline phases found provide
potentiality for preparing mesoporous, nitride-based solids.
Free Keywords:liquid ammonia; liquid crystals; X-ray diffraction
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany
Identifiers:ISI:000180868800003
ISSN:0947-6539
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