Trapping Metal Nanoclusters in “Soap and Water” Soft Crystals

Eiser, Erika; Bouchama, Fatima; Thathagar, Mehul B.; Rothenberg, Gadi

doi:10.1002/cphc.200300721

Cited by 27 publications

(33 citation statements)

References 29 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concentration profile of the Pd 2 ions (dark circles) shows three clear steps pertaining to the three portions of NaBH 4 . The nanocluster signal is observed over the whole range of the spectrum, including a substantial contribution in the 300 ± 370-nm region.…”

Section: Nas/pca Versus Traditional Approachmentioning

confidence: 99%

In Situ Spectroscopic Analysis of Nanocluster Formation

et al. 2004

Self Cite

View full text Add to dashboard Cite

The importance of small metal clusters in catalysis and the problems in understanding the clustering process in solution are outlined. A new analysis method for UV/Vis spectra is presented and applied to monitor the kinetics of ion reduction and cluster formation in situ. This method, which is based on a combination of two chemometric techniques, takes into account the entire UV/Vis spectrum and offers better interpretation possibilities than the traditional "band-assignment" approach. This is particularly true for nanoclusters because these have significant spectral contributions also outside the broad plasmon band that is usually associated with them. The reduction of palladium, gold, and silver ions and the formation of the corresponding clusters is monitored in the presence of two different reducing agents, sodium borohydride and tetraoctylammonium acetate. While Pd2+ is found to reduce and cluster directly, the spectral decomposition of the Au3+ reduction profiles shows two species corresponding to the Au+ intermediate and the Au0 clusters. The rates of reduction and clustering for Pd, Au, and Ag are compared and the possibilities of synthesising multimetallic clusters of these metals by coreduction are discussed.

show abstract

Section: Nas/pca Versus Traditional Approachmentioning

confidence: 99%

In Situ Spectroscopic Analysis of Nanocluster Formation

et al. 2004

Self Cite

View full text Add to dashboard Cite

show abstract

“…We should also mention here (without going into details) the inclusion of noble metal particles in hexagonal [26] or sponge phases.…”

Section: Noble Metalsmentioning

confidence: 99%

“…[23] Other preparation methods include synthesizing the particles directly within the lamellar phase [24] and dispersing the particles in a dilute micellar phase and then concentrating it by the addition of a polymer that competes with the surfactant for the hydration water. [25] We should also mention here (without going into details) the inclusion of noble metal particles in hexagonal [26] or sponge phases. [27] Quantum Dots Semiconductor nanocrystals, or "quantum dots" (QDs) also have interesting electronic and optical properties, which are very sensitive to their size.…”

Section: Noble Metalsmentioning

confidence: 99%

“…The dispersion state of the particles was monitored using UV-Vis spectroscopy. Using a similar approach, Firestone et al monitored the position of the particles in the lamellar phase by the shift of the surface plasmon resonance.[23] Other preparation methods include synthesizing the particles directly within the lamellar phase [24] and dispersing the particles in a dilute micellar phase and then concentrating it by the addition of a polymer that competes with the surfactant for the hydration water.[25]We should also mention here (without going into details) the inclusion of noble metal particles in hexagonal [26] or sponge phases.[27]Quantum Dots Semiconductor nanocrystals, or "quantum dots" (QDs) also have interesting electronic and optical properties, which are very sensitive to their size. Water-soluble QDs were incorporated in well-oriented lipid lamellar phases deposited on a solid substrate.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Lamellar L_α Mesophases Doped with Inorganic Nanoparticles

Constantin¹

2014

ChemPhysChem

View full text Add to dashboard Cite

A flourishing research activity, bringing together chemistry, physics and materials science, aims to develop nanostructured hybrid systems composed of nanoparticles with interesting properties (optical, magnetic, catalytic, etc.) IntroductionElaborating and investigating hybrid materials by inserting inorganic (metallic or mineral) nanoparticles into liquid crystal phases has recently become the focus of intense worldwide research, motivated by the perspective of industrial applications as diverse as display technology, drug delivery, or information storage. Indeed, such hybrid materials may combine the typical electronic properties of inorganic materials (magnetism, lightabsorption, electrical conductivity) with the characteristic properties of liquid-crystals (fluidity, anisotropy, processability, spatial confinement). From a more fundamental point of view, these hybrid materials can also help addressing new issues about novel mesophases and about how the lamellar mesophase is affected by the nanometric inclusions and how the latter experience new membrane-mediated interactions. Moreover, such organic-inorganic lamellar phases provide good model systems to mimic peptidic inclusions in biological membranes. Both these applied and fundamental considerations drive the fast expansion of this field, making this Minireview timely. The scope of this Minireview, however, has been restricted in order to keep it to a reasonable size. For example, we will not address here the cases of either large particles (with all dimensions larger than about 100 nm) or thermotropic liquid crystals. The latter have been the subject of recent reviews. [1] Moreover, although hybrid materials obtained by inserting mineral or metallic nanoparticles into the lamellar phase of blockcopolymers have recently raised much attention, this large research field will not be covered as fairly recent reviews have been dedicated to this topic.[1e, 2] Also, we will not describe the insertion of polymer coils into lamellar phases. Moreover, we will not review here any work about the DNA-surfactant complexes that have raised much interest for applications in transfection since the mid-1990s. [3] We only consider bulk materials and thus we omit thin films, Langmuir monolayers and layer-by-layer assemblies. We also do not consider here the hybrid lamellar phases of organometallic lyotropic and thermotropic compounds that display homogeneous inorganic sublayers rather than individual nanoparticles. [4] In spite of the recent reports of liquidcrystalline properties of graphene and graphene oxide suspensions [5] and of the insertion of graphene in thermotropic liquid crystals, [6] we are not yet aware of any work describing lyotropic lamellar phases doped with such carbon-based nanosheets. Most importantly, we do not review here the fastexpanding field of the synthesis of nanoparticles within liquidcrystalline templates. [7] In recent years, the study of nanoparticles inserted within lyotropic mesophases has made remarkable progress. This development was ...

show abstract

“…Morphological features in the form of striations forming a crosshatch [126,127] are attributed to the columnar rectangular phase, A 8 . A typical fan-shaped texture resulting from the thermomechanical undulation of the columns [128,129] was observed from the columnar hexagonal phase, E 10 .…”

Section: Figure 33mentioning

confidence: 99%