Metal ion extraction in microheterogeneous systems

Hébrant, Marc

doi:10.1016/j.ccr.2009.03.006

Cited by 40 publications

(15 citation statements)

References 91 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…While their amphiphilic nature makes them attractive candidates for the assembly of nano-scale, metal-containing colloids, the headgroup ligand can impart a rich metal-coordination chemistry that can be used to tune the nature of the self-assembled structures. Metallosurfactants have been reviewed recently from a number of different perspectives, including metallomicelles [1,2], supramolecular aggregates of lipophilic Gd(III)-MRI contrast agents [3], metalloaggregates for catalysis, transport and sensing [4,5], nanoscale molecular containers for fluorescent sensors [6], and for metal extraction strategies [7]. Because the metal-cation is generally located at the hydrophilic–hydrophobic interface of the colloid, metallosurfactants are attractive as catalysts to react with either hydrophilic or hydrophobic substrates [8,9].…”

Section: Introductionmentioning

confidence: 99%

Metallosurfactants of bioinorganic interest: Coordination-induced self assembly

Owen

Butler

2011

Coordination Chemistry Reviews

View full text Add to dashboard Cite

This review covers selected surfactant ligands that undergo a change in aggregate morphology upon coordination of a metal ion, with a particular focus on coordination-induced micelle-to-vesicle transitions. The surfactants include microbially produced amphiphilic siderophores, as well as synthetic amphiphilic ligands. The mechanism of the metal-induced phase change is considered in light of the coordination chemistry of the metal ions, the nature of the ligands, and changes in molecular geometry that result from metal coordination. Of particular interest are biologically produced amphiphiles that coordinate transition metal ions and amphiphilic ligands of relevance to bioinorganic chemistry.

show abstract

Section: Introductionmentioning

confidence: 99%

Metallosurfactants of bioinorganic interest: Coordination-induced self assembly

Owen

Butler

2011

Coordination Chemistry Reviews

View full text Add to dashboard Cite

show abstract

“…Ein weiteres Phänomen ist die Metallionenextraktion in mikroheterogenen Systemen, die man gezielt einsetzt, um die Geschwindigkeit chemischer Reaktion zu beeinflussen oder um die fixierten Metallionen mittels einer nachgeschalteten Ultrafiltration zu entfernen [13]. Bei Verwendung des Kationenaustauschers Di(2-ethylhexyl)phosphorsäure (D 2 EHPA) zur mizellaren Metallionenextraktion nutzt man die gute Wasserlöslichkeit und die Grenzflächenaktivität seines anionischen Restes, der ebenfalls tensidische Eigenschaften aufweist, indem man entweder direkt das Natriumsalz der Organophosphorsäure einsetzt oder durch Zusatz von Lauge die Ionenaustauscher konditioniert [14].…”

Section: Problemstellungunclassified

Micellar Extraction of Zinc with Di(2‐ethylhexyl)phosphoric Acid and the Addition of the Cationic Surfactant Cetyltrimethylammonium Bromide

Raatz

Klapper

Repke

2011

Chemie Ingenieur Technik

View full text Add to dashboard Cite

Durch den Zusatz von Tensiden kann die Extraktion deutlich beeinflusst werden. Für Tensidkonzentration geringfügig oberhalb der kritischen Mizellbildungskonzentration steigt die Stofftransportrate durch die Bildung inverser Mizellen und eines dadurch verursachten mizellaren Zinkextraktionsmechanismus. Anhand von Extraktionsgleichgewichten und Stoffaustauschuntersuchungen wird die Beeinflussung der Zinkextraktion mit dem Kationenaustauscher Di(2‐ethylhexyl)phosphorsäure (D2EHPA) unter Zugabe des Tensids Cetyltrimethylamoniumbromid (CTAB) aufgezeigt und phänomenologisch erläutert.

show abstract

“…Reversed micelles and water-in-oil (W/O) microemulsions, the nanometric aggregates formed by surfactants in organic solvents, have various capabilities, e. g., acting as media for the preparation of functional materials and the extraction of proteins and metal ions [1][2][3]. The difference of reversed micelles from W/O microemulsions rests on the nonavailability of free water in the core called the "micropool".…”

Section: Introductionmentioning

confidence: 99%

Characterization of reversed micelles formed in solvent extraction of thorium(IV) by bis(2-ethylhexyl) phosphoric acid. Transforming from rodlike to wormlike morphology

et al. 2016

View full text Add to dashboard Cite

The reversed micelles formed in solvent extraction of thorium(IV) by bis(2-ethylhexyl) phosphoric acid (HDEHP) in -heptane were studied. IR spectra, dynamic/static light scattering and zero shear viscosity measurements indicated that thorium complexes formed rodlike reversed micelles, and both the size of aggregates and the viscosity of the organic phase increased with the increasing loadage of thorium(IV). The entanglement of reversed micelles resulted in their transformation to wormlike reversed micelles, inducing the very high viscosity of the organic phase. The structural composition of thorium complexes was proposed to be Th(DEHP) 3 (NO 3 ) according to the results of log-log plot and job method analysis.Furthermore, molecular modeling was employed to clarify the structures of reversed micelles as well as the state of water inside. It was found that the complexes linked together via hydrogen bonding and van der Waals forces and that the existence of NO − 3 and H 2 O improved the stability of reversed micelles.

show abstract

Metal ion extraction in microheterogeneous systems

Cited by 40 publications

References 91 publications

Metallosurfactants of bioinorganic interest: Coordination-induced self assembly

Metallosurfactants of bioinorganic interest: Coordination-induced self assembly

Micellar Extraction of Zinc with Di(2‐ethylhexyl)phosphoric Acid and the Addition of the Cationic Surfactant Cetyltrimethylammonium Bromide

Characterization of reversed micelles formed in solvent extraction of thorium(IV) by bis(2-ethylhexyl) phosphoric acid. Transforming from rodlike to wormlike morphology

Contact Info

Product

Resources

About