Self‐Patterning of Hydrophobic Materials into Highly Ordered Honeycomb Nanostructures at the Air/Water Interface

Fan, Dawei; Jia, Xiaoxu; Tang, Peng; Hao, Jingcheng; Liu, Tianbo

doi:10.1002/anie.200604180

Cited by 101 publications

(70 citation statements)

References 32 publications

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“…Increasing the polarity of the solvent by addition of acetonitrile to the chloroform solution can alter the morphology to produce more ordered, sea urchin-like aggregates with the long needles extending out from the core in different directions (see Figure 3). The surface behaviors of compound 5 and 6 show significant differences from the "honeycomb" morA C H T U N G T R E N N U N G phology of other SECs [11] reported. In contrast to the SEM images of Comparison of the thermal properties of the TBA and DMDOA salts of 3 a and 4 a (i.e.…”

Section: Resultsmentioning

confidence: 71%

“…3) SEM images show that highly ordered, uniform, rodlike morphology for compounds 3-4, whereas well sea urchin-like morphology for compound 5-6 from the mixture of CHCl 3 /MeCN. These unusual surface behaviors, which are very different from the "honeycomb" or "onionlike" morphologies of DMDOABr or other SECs, [11] are caused by the existence of SGC for compound 3-4 and the co-existence of SGC-SEC for compound 5-6 considering that Mn-Anderson itself appears to be amorphous powder on the surface. 4) All of these materials (compounds 3-6) are thermally stable to 250 8C and basic physical and chemical properties of the Mn-Anderson cluster are retained.…”

Section: Wwwchemeurjorgmentioning

confidence: 90%

“…[23] Nevertheless, examples with polyoxometalates have rarely been reported, despite their versatile nature. In the few related papers of POM-containing hydrophobic materials reported so far, [11] the POM hybrids have been obtained through surfactant encapsulation and mainly electrostatic interactions exist between POM and surfactant molecules. In parallel to these studies, we have been interested in developing POM hybrid assemblies by covalently anchoring organic groups to POM clusters in order to engineer new physical properties and in exploiting the development of synergistic effects between the different functional groups.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, cationic surfactants have been applied to assembly with POM clusters [11] and the resulting surfactant-encap-A C H T U N G T R E N N U N G sulated clusters (SECs) are compatible with organic functional groups, which have been successfully assembled into polymeric [12] and liquid crystalline matA C H T U N G T R E N N U N G erials. [13] These materials show it is possible to retain the basic physical and chemical properties of the POM clusters, however, it should be emphasized that mainly electrostatic interactions exist Abstract: Grafting of C-6, C-16 and C-18 alkyl chains onto the hydrophilic Mn-Anderson clusters (compounds 2-4) has been achieved.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Song

McMillan

Long

et al. 2008

Chemistry A European J

139

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Grafting of C-6, C-16 and C-18 alkyl chains onto the hydrophilic Mn-Anderson clusters (compounds 2-4) has been achieved. Exchange of the tetrabutyl ammonium (TBA) with dimethyldioctadecyl ammonium (DMDOA) results in the formation of new polyoxometalate (POM) assemblies (compounds 5-6), in which the POM cores are covalently functionalized by hydrophilic alkyl-chains and enclosed by surfactant of DMDOABr. As a result, we have been able to design and synthesize POM-containing hydrophobic materials beyond surfactant encapsulation. In solid state, scanning electron and transmission electron microscopy (SEM and TEM) studies of the TBA salts of compounds 3 and 4 show highly ordered, uniform, reproducible assemblies with unique segmented rodlike morphology. SEM and TEM studies of the DMDOA salts of compounds 5 and 6 show that they form spherical and sea urchin 3D objects in different solvent systems. In solution, the physical properties of compound 5 and 6 (combination of surfactant-encapsulated cluster (SEC) and surface-grafted cluster (SGC)) show a liquid-to-gel phase transition in pure chloroform below 0 degrees C, which are much lower than other reported SECs. By utilizing light scattering measurements, the nanoparticle size for compounds 5 and 6 were measured at 5 degrees C and 30 degrees C, respectively. Other physical properties including differential scanning calorimetry have been reported.

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Section: Resultsmentioning

confidence: 71%

Section: Wwwchemeurjorgmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Song

McMillan

Long

et al. 2008

Chemistry A European J

139

View full text Add to dashboard Cite

show abstract

“…Cl − or Br − ) into the aqueous phase, and the entropically favorable liberation of a large number of ammonium cations and water molecules from the cluster surface may equally contribute to the free energy of SEC formation. Recently, many other studies concerning surfactant-encapsulated POMs have been published [152][153][154][155].…”

Section: Surfactant-encapsulated Pom Clustermentioning

confidence: 99%

Metallo-supramolecular modules as a paradigm for materials science

Kurth

2008

Science and Technology of Advanced Materials

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Metal ion coordination in discrete or extended metallo-supramolecular assemblies offers ample opportunity to fabricate and study devices and materials that are equally important for fundamental research and new technologies. Metal ions embedded in a specific ligand field offer diverse thermodynamic, kinetic, chemical, physical and structural properties that make these systems promising candidates for active components in functional materials. A key challenge is to improve and develop methodologies for placing these active modules in suitable device architectures, such as thin films or mesophases. This review highlights recent developments in extended, polymeric metallo-supramolecular systems and discrete polyoxometalates with an emphasis on materials science.

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Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism

Zhang

Liu

Kurth

et al. 2009

Adv Funct Materials

143

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A variety of functional nanostructured organic/inorganic hybrid materials from the europium‐exchanged derivative of a Preyssler‐type polyoxometalate (POM), [EuP5W30O110]12−, and functional organic surfactants were prepared by the ionic self‐assembly (ISA) route. The effect of organic surfactants on the structure, photoluminescent, electrochemical and electrochromic properties of the POM anions was investigated in detail. All obtained hybrid materials are amphotropic, i.e., exhibit both thermotropic and lyotropic liquid‐crystalline phase behaviour. Investigations of their photophysical properties have shown that the interactions of the various surfactants with the polyanions influence the coordination environments and site symmetry of Eu3+ in different ways. The functional groups in the organic surfactants significantly influence the electrochromic properties and photoluminescence of POMs. Different from normal and pyridine‐containing complexes, no photoluminescence and no electrochromism were observed from the ferrocene‐containing complexes. This may be explained in view of charge transfer between the POM anion and the ferrocenyl group.

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Self‐Patterning of Hydrophobic Materials into Highly Ordered Honeycomb Nanostructures at the Air/Water Interface

Cited by 101 publications

References 32 publications

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Metallo-supramolecular modules as a paradigm for materials science

Organized Nanostructured Complexes of Polyoxometalates and Surfactants that Exhibit Photoluminescence and Electrochromism

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