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Issue 10, 2020
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Effects of pH, temperature and shear on the structure–property relationship of lamellar hydrogels from microbial glucolipids probed by in situ rheo-SAXS

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Abstract

Lipid lamellar hydrogels are a class of soft materials composed of a defectuous lipid lamellar phase, where defects are classically stabilized by polymer or surfactant inclusions in lipid membranes. We have recently shown that bolaform microbial glucolipids, composed of a single glucose headgroup and a C18:0 fatty acid, with the carboxylic acid group located opposite to glucose, spontaneously form lamellar hydrogels at room temperature below pH 8. In this work, we combine rheology with small angle X-ray scattering (SAXS), rheo-SAXS, to correlate, in situ, the structural and mechanical properties of microbial glycolipid lamellar hydrogels upon application of three different stimuli: pH, temperature and a shear rate. In all cases we find unusual structural features of the lamellar phase if compared to classical phospholipid lamellar structures: reducing pH from alkaline to acidic induces a sol-to-gel transition during which an increasing elastic modulus is associated with an oscillatory evolution of lamellar d(100) spacing; temperature above Tm and increasing shear induce the formation of spherulitic crumpled domains, instead of a classically-expected lamellar-to-vesicle or lamellar-to-onion phase transitions.

Graphical abstract: Effects of pH, temperature and shear on the structure–property relationship of lamellar hydrogels from microbial glucolipids probed by in situ rheo-SAXS

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Supplementary files

Article information


Submitted
20 Dec 2019
Accepted
25 Jan 2020
First published
25 Feb 2020

Soft Matter, 2020,16, 2540-2551
Article type
Paper

Effects of pH, temperature and shear on the structure–property relationship of lamellar hydrogels from microbial glucolipids probed by in situ rheo-SAXS

G. Ben Messaoud, P. Le Griel, D. Hermida-Merino and N. Baccile, Soft Matter, 2020, 16, 2540
DOI: 10.1039/C9SM02494H

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