Universität zu Köln

Menold, Philipp ORCID: 0000-0002-7734-9273, Strey, Reinhard, Preisig, Natalie and Stubenrauch, Cosima (2021). Experimental evidence of a transition from a sponge-like to a foam-like nanostructure in water-rich L-3 phases. J. Colloid Interface Sci., 601. S. 133 - 143. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1095-7103

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Abstract

Hypothesis: The micrometer-sized gas bubbles of a liquid foam with a dispersed gas phase of > 74 vol% are polyhedral and surrounded by a continuous aqueous phase. The structure of a water-rich microemulsion with a water phase of > 74 vol% normally consists of oil droplets in water or is bicontinuous. We hypothesize that at these high water contents polyhedral water droplets in oil can also exist. Experiments: We (a) carried out phase studies on the water-rich side of the phase diagram of the quaternary system water/NlaCl - hexyl methacrylate - AOT, because AOT is known for its propensity to form water-in-oil structures and hexyl methacrylate can be polymerized, (b) measured the electrical conductivities and viscosities, and (c) visualized the nanostructure with freeze-fracture electron microscopy (FFEM). Findings: We found narrow 1-phase regions emanating from the L-3 phase of the oil-free water/NaCl - AOT system by adding small amounts of oil. In these regions the conductivities become extremely low and the viscosities are extremely high. In addition, FFEM images clearly show the foam-like nanostructure. (C) 2021 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Menold, Philipp UNSPECIFIED orcid.org/0000-0002-7734-9273 UNSPECIFIED Strey, Reinhard UNSPECIFIED UNSPECIFIED UNSPECIFIED Preisig, Natalie UNSPECIFIED UNSPECIFIED UNSPECIFIED Stubenrauch, Cosima UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-572190
DOI:	10.1016/j.jcis.2021.05.063
Journal or Publication Title:	J. Colloid Interface Sci.
Volume:	601
Page Range:	S. 133 - 143
Date:	2021
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1095-7103
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SPONTANEOUS CURVATURE; NEUTRON-SCATTERING; BENDING MODULI; MICROEMULSIONS; MICROSTRUCTURE; EMULSIONS; BEHAVIOR; OIL; MONOLAYERS; LAMELLAR Multiple languages Chemistry, Physical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57219