Spin State As a Probe of Vesicle Self-Assembly

Kim, Sanghoon; Bellouard, C.; Eastoe, Julian; Canilho, Nadia; Rogers, Sarah E.; Ihiawakrim, Dris; Ersen, Ovidiu; Pasc, Andreea

doi:10.1021/jacs.6b00537

Cited by 27 publications

(17 citation statements)

References 45 publications

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“…In addition, the ability for these surfactants to adsorb onto surfaces such as nanoparticles etc. [18,20] may provide alternative routes for developing molecular magnets. …”

Section: Muon Spin Relaxation Measurements Of Bulk Ddafmentioning

confidence: 99%

Magnetic surfactants as molecular based-magnets with spin glass-like properties

Brown¹,

Smith²,

Padrón-Hernández³

et al. 2016

J. Phys.: Condens. Matter

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Magnetic Surfactants as Molecular Based-Magnets with Spin Glass-Like Properties AbstractThis paper reports the use of muon spin relaxation spectroscopy to study how the aggregation behavior of magnetic surfactants containing lanthanide counterions may be exploited to create spin glass-like materials.Surfactants provide a unique approach to building in randomness, frustration and competing interactions into magnetic materials without requiring a lattice of ordered magnetic species or intervening ligands and elements. We demonstrate that this magnetic behavior may also be manipulated via formation of micelles rather than simple dilution, as well as via design of surfactant molecular architecture. This somewhat unexpected result indicates the potential of using novel magnetic surfactants for the generation and tuning of molecular magnets.

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“…In addition, the ability for these surfactants to adsorb onto surfaces such as nanoparticles etc. [18,20] may provide alternative routes for developing molecular magnets. …”

Section: Muon Spin Relaxation Measurements Of Bulk Ddafmentioning

confidence: 99%

Magnetic surfactants as molecular based-magnets with spin glass-like properties

Brown¹,

Smith²,

Padrón-Hernández³

et al. 2016

J. Phys.: Condens. Matter

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“…Improvement of nanoparticles distribution in a mesoporous silica matrix could be reached by using self-assembled surfactant phases, such as micelles or liquid crystals [39][40][41]. Among them, our group reported ferrosurfactants which are able to form either micelles [42], vesicles [43] or to stabilize solid lipid nanoparticles. The latter, dispersed in a micellar solution of a non-ionic surfactant, P123, could lead to highly dispersed iron oxide nanoparticles within a mesoporous-macroporous silica matrix.…”

Section: Introductionmentioning

confidence: 99%

Imprinting isolated single iron atoms onto mesoporous silica by templating with metallosurfactants

Berro

Gueddida

Bouizi

et al. 2020

Journal of Colloid and Interface Science

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One of the main drawbacks of metal-supported materials, traditionally prepared by the impregnation of metal salts onto pre-synthesized porous supports, is the formation of large and unevenly dispersed particles. Generally, the larger are the particles, the lower is the number of catalytic sites. Maximum atom exposure can be reached within single-atom materials, which appear therefore as the next generation of porous catalysts. ExperimentsHerein, we designed single iron atom-supported silica materials through sol-gel hydrothermal treatment using mixtures of a non-ionic surfactant (Pluronic P123) and a metallosurfactant (cetyltrimethylammoniumtrichloromonobromoferrate, CTAF) as porogens. The ratio between the Pluronic P123 and the CTAF enables to control the silica structural and textural properties. More importantly, CTAF acts as an iron source, which amount could be simply tuned by varying the non-ionic/metallo surfactants molar ratio. FindingsThe fine distribution of iron atoms onto the silica mesopores results from the iron distribution within the mixed micelles, which serve as templates for the polymerization of the silica matrix. Several characterization methods were used to determine the structural and textural properties of the silica material (XRD, N 2 sorption isotherms and TEM) and the homogeneous distribution and lack of clustering of iron atoms in the resulting materials (elemental analysis, magnetic measurements, pair distribution function (PDF), MAS-NMR and TEM mapping).The oxidation and spin state of single-iron atoms determined from their magnetic properties were confirmed by DFT calculations. This strategy might find straightforward applications in preparing versatile single atom catalysts, with improved efficiency compared to nanosized ones.

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“…With the reaction of 1-butyl-3methylimidazolium chloride ([C 4 mim][Cl]) with ferric chloride (FeCl 3 ), paramagnetic ionic liquids (PMILs) were synthesized for the first time by Satoshi and Hamaguchi et al 9 Many d-and f-block transition metal-based PMILs have subsequently been synthesized and used for numerous applications, including mapping and imaging of porous subterranean formation, 10 and magnetic levitation of diamagnetic materials. 11 Some PMILs have been explored for desulfurization, 12 organic synthesis, 13 micro extraction, [14][15][16] electrocatalysis, 17 probes for vesicles, 18 selfassembling media for surfactants, 19 acidic catalysis, 20 density measurement, 21 paramagnetic polymer synthesis, 22,23 microemulsion formulation, 24 chitosan-supported magnetic IL-based catalysis, 25 CO 2 separation, 26 analytical applications, 27,28 and other diverse applications. [29][30][31] Brown et al studied paramagnetic surfactants (magnetic surfactants) with symmetric [FeCl 4 ] À and asymmetric anions [FeCl 3 Br] À .…”

Section: Introductionmentioning

confidence: 99%