The aqueous liquid/liquid interphases formed by chitosan-anionic surfactant complexes

Olteanu, Mihaela; Mandru, I.; Dudau, Manuela; Peretz, Sandu; Cintezã, Otilia

doi:10.1007/3-540-36114-6_11

Cited by 10 publications

(5 citation statements)

References 16 publications

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“…The polymer–surfactant complexes can be present in the system as clear solution, as colloidal particles or as gels with good mechanical properties . The interaction between ionic polymers and oppositely charged surfactants is dominated by electrostatic forces, causing the association at a very low surfactant concentration, known as the critical aggregation concentration (CAC), usually a few orders of magnitude lower than the critical micelle concentration (CMC) of the surfactant …”

Section: Introductionmentioning

confidence: 99%

Chitosan‐sodium lauryl ether sulfate particles and their use for adsorption of Cu(II) ions

Peretz

Florea-Spiroiu

Anghel

et al. 2013

J of Applied Polymer Sci

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The synthesis of small particles through the interaction between chitosan (CS) and sodium lauryl ether sulfate (SLES) was studied. Depending on working condition, microparticles at atmospheric pressure and ultrafine particles at high pressure have been obtained. At atmospheric pressure, the microparticles were formed instantaneously when the CS solution was dripped into the SLES aqueous solution. To obtain ultrafine particles, the surfactant solution in contact with high pressure carbon dioxide was sprayed into chitosan solution. Fourier Transform Infrared Spectroscopy proves the interaction between the sulfate groups of SLES and the amino groups of CS. The Scanning Electron Microscopy reveals that the microparticles are quasi-spherical, but some of them can take the form of pellets depending on preparation conditions. The obtained microparticles were successfully used to uptake Cu(II) ions from aqueous solutions. The adsorption of Cu(II) depends on pH being maximum at pH 5 5.5. The kinetic experiments demonstrated that Cu(II) adsorption onto CS/SLES microparticles obeys the Langmuir model.

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Section: Introductionmentioning

confidence: 99%

Chitosan‐sodium lauryl ether sulfate particles and their use for adsorption of Cu(II) ions

Peretz

Florea-Spiroiu

Anghel

et al. 2013

J of Applied Polymer Sci

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“…16 Control of the thickness of an interfacial gel at a water/water (w/w) interface, formed by stoichiometric complexation between chitosan and sodiumdodecylsulfate anions, was achieved in a diffusion-limited regime. 17 The interactions in the latter system were explored in further studies, 18 yet the formation, neither of hollow w/w microcapsules nor of macroscopic films with controlled thickness and size via a supramolecular ionic complexation process in a single shot, has been reported, to the best of our knowledge. Besides the muco-adhesiveness of chitosan reported in the literature, 19 the design of mechanically strong hollow capsules has high relevance in food for they offer improved encapsulation capabilities.…”

Section: Introductionmentioning

confidence: 99%

Tuneable thickness barriers for composite o/w and w/o capsules, films, and their decoration with particles

et al. 2011

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Oil-in-water and water-in-oil capsules, and flat membranes of tuneable thickness and composition were prepared in one single facile step, based on the interfacial complexation between chitosan and anionic phosphatidic fatty acids. The phosphatidic acid molecules were introduced via the oil phase. The thickness of the capsule shell or the membrane grows by a diffusion-controlled mechanism, hence can be tuned using e.g. concentration and formation time parameters. A mechanism is proposed to explain the observed behavior. The capsule size is set by the emulsification conditions applied. Microfluidic methods proved useful for the generation of hollow capsules of uniform size and thickness in one step. The capsules and membranes display remarkable integrity over several years in a pH window 2-14. The thickness can easily reach several micrometres within an hour for the wet capsule shell or membrane, which explains the high interfacial rheological properties measured. Hence various processes can be envisaged after their formation. The simple preparation opens the way to tailored, environmentresponsive composite systems for fabricating biopolymer-based materials for various applications. The capsules could be washed from the surrounding continuous phase and placed into one of arbitrary choice. Furthermore, the surface of the w/o capsules and of the membranes could be decorated by particles that attach to the water/oil interface with a high energy. The choice of the particle functionality is left open.

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“…A comparison of chitosan (Mw = 600 KDa, DA not given) -AOT capsules with chitosan -SDS capsules reveals that the AOT capsules are formed in a narrower composition range. This is explained by the retention of the bilayer structure of the AOT aggregates also in the complex, which is more difficult to cross-link compared to the small globular micelles formed by SDS [81].…”

Section: Chitosan-strong Anionic Surfactantmentioning

confidence: 95%

“…In a first instance this causes a rather limited solubility of the mixtures which can be exploited for the preparation of capsules [75,76,80,81,102,104,[214][215][216]. These capsules were shown to be able to efficiently adsorb metal ions such as Cu(II) [76] as well as organic dyes [215,216] but they can also be employed as drug carrier systems [80,214].…”

Section: Applicationsmentioning

confidence: 97%

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Co-assembly in chitosan–surfactant mixtures: thermodynamics, structures, interfacial properties and applications

Chiappisi

Gradzielski

2015

Advances in Colloid and Interface Science

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The aqueous liquid/liquid interphases formed by chitosan-anionic surfactant complexes

Cited by 10 publications

References 16 publications

Chitosan‐sodium lauryl ether sulfate particles and their use for adsorption of Cu(II) ions

Chitosan‐sodium lauryl ether sulfate particles and their use for adsorption of Cu(II) ions

Tuneable thickness barriers for composite o/w and w/o capsules, films, and their decoration with particles

Co-assembly in chitosan–surfactant mixtures: thermodynamics, structures, interfacial properties and applications

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