Tuning colloidal interactions through coordination chemistry

Autor: Mathieu Joubert, Martin In
Přispěvatelé: Laboratoire des colloïdes, verres et nanomatériaux (LCVN), Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2008
Předmět:
Chemical Phenomena
Light
Inorganic chemistry
Supramolecular chemistry
02 engineering and technology
010402 general chemistry
01 natural sciences
Micelle
Phase Transition
Coordination complex
Colloid
Surface-Active Agents
Pulmonary surfactant
Dynamic light scattering
Scattering
Small Angle
Colloids
Physical and Theoretical Chemistry
Micelles
chemistry.chemical_classification
Chemistry
Physical
[CHIM.MATE]Chemical Sciences/Material chemistry
021001 nanoscience & nanotechnology
Small-angle neutron scattering
Atomic and Molecular Physics
and Optics
Organophosphates
3. Good health
0104 chemical sciences
Quaternary Ammonium Compounds
Neutron Diffraction
[CHIM.POLY]Chemical Sciences/Polymers
chemistry
Models
Chemical
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Physical chemistry
Self-assembly
0210 nano-technology
Zdroj: ChemPhysChem
ChemPhysChem, Wiley-VCH Verlag, 2008, 9 (7), pp.1010-1019. ⟨10.1002/cphc.200700593⟩
ISSN: 1439-7641
1439-4235
DOI: 10.1002/cphc.200700593⟩
Popis: The present work addresses the question of the range and amplitude of bridging attraction that is induced between surfactant micelles functionalized with complexing groups in the presence of coordination centers. An alkylethoxylated ester phosphate (AEP) is synthesized from a non-ionic surfactant and anchored into DTAB micelles. In the absence of any coordination center, functionalized micelles repel each other. Phase behavior, dynamic light scattering and small angle neutrons scattering (SANS) experiments show that this repulsive interaction is switched to attractive by the addition of coordination centers such as aluminum cations. The extent of the composition range of coexisting phase depends on the concentration of coordination center and on the pH. Analysis of the structure factor obtained from SANS shows that the range of attraction is determined by the molecular dimension of the chelating surfactant, while the depth can be tuned with the concentration of coordination center and the pH. The strong influence of the pH is interpreted as arising from the condensation of aluminium cations that lead to high functional polynuclear complexes.
Databáze: OpenAIRE
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