Layered Organosilicate Nanoparticles with Liquidlike Behavior

Bourlinos, Athanasios B.; Chowdhury, Subhendu Ray; Jiang, David D.; An, Yeong-U.; Zhang, Qiang; Archer, Lynden A.; Giannelis, Emmanuel P.

doi:10.1002/smll.200400027

Cited by 104 publications

(88 citation statements)

References 15 publications

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“…Recently, Bourlinos et al 25 reported another type of organization in alkylsiloxanes. They prepared layered hybrids containing two distinct phases (i.e., bilayer and interdigitated monolayer) by refluxing octadecyltrichlorosilane in toluene with a small amount of water.…”

Section: Multilayered Hybrids Derived From Trifunctional Alkylsilanesmentioning

confidence: 99%

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

2006

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This paper reports on recent progress in the synthesis of nanostructured siloxane-organic hybrids based on the self-assembly of amphiphilic silicon-based precursors. A variety of ordered hybrid materials have been obtained by molecular design of the precursors. Alkoxysilanes and chlorosilanes with covalently attached hydrophobic organic tails are hydrolyzed to form amphiphilic molecules containing silanol groups, leading to the formation of layered (lamellar) structures. Transparent and oriented thin films of lamellar hybrids were prepared by the reaction in the presence of tetraalkoxysilane. In addition, the design of molecules having alkyl chains and large oligosiloxane heads led to the formation of mesophases consisting of cylindrical assemblies, providing a direct pathway to ordered porous silica. The synthesis, structural features, and formation processes of these hybrid mesostructures are discussed.

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Section: Multilayered Hybrids Derived From Trifunctional Alkylsilanesmentioning

confidence: 99%

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

2006

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“…An interdigitated organization of molecules also fits a d-spacing value of 1.7 nm. In this lamellar packing mode, alkyl chains of adjacent molecules are alternately pointing up and down [3,9]. Finally, this high intensity peak may also originate from BUDTMS bilayers in which bromine atoms strongly diffract X-rays.…”

Section: Figure 2 Chemical Formula and Electrostatic Potential Surfamentioning

confidence: 89%

“…This sub-branch of supramolecular chemistry which focuses on the spontaneous and reversible construction of ordered aggregates through weak intermolecular interactions represents a facile route to produce organic-inorganic hybrid nanolayers with long-range ordering. Over the past twenty years, many efforts have been devoted to the construction and structural optimization of well-ordered organic-inorganic nanolayers from monofunctional organosilane surfactants [1][2][3]. The organization process of such building blocks has been extensively investigated and is known to be governed mainly by the hydrophobic effect arising from a competition of attractive and repulsive interactions between inorganic polar heads, organic nonpolar tails, solvent and water molecules [4,5].…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of organic-inorganic hybrid nanolayers: effect of endgroup polarity on nanostructures

Dhôtel

Delbreilh

et al. 2013

MATEC Web of Conferences

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“…In this work, we attempt at combining the above challenges: We utilize a new 45 well-characterized system consisting of planar neutral nanoparticles with grafted alkyl chains; these colloids are suspended in two different solvent media in an effort to explore different possibilities for tuning gelation and phase separation. The nanoparticles are schematically shown in Fig.…”

Section: -44mentioning

confidence: 99%

“…This pronounced ordering corresponds to an interlayer spacing of about 9 nm, which is larger than the reported spacing of about 6 nm in the solid material ascribed to stacks of bilayers. 45 Here, the swelling by the solvent decane and intermolecular ordering of decane and grafted C 18 H 37 chains into packings of alkane crystals 38,73 can rationalize the larger spacing in the nanoparticle suspension and hence the shift of the SAXS peak of the gel-like microphase separated nanoparticles to low q values. The concurrent opaque appearance of the nanoparticle suspension (right image in Fig.…”

mentioning

confidence: 97%

Solvent-mediated pathways to gelation and phase separation in suspensions of grafted nanoparticles

et al. 2009

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We explore the role of the solvent medium on the interplay between gelation and phase separation in suspensions of organosilicate planar hybrids grafted with hydrocarbon chains. We establish their phase diagram by means of dynamic light scattering, rheology and visual observations, and different routes to gelation, depending on the solvent used. In agreement with earlier works, the solvent quality for the grafted chains at a given temperature controls the balance between attractions and repulsions, and hence the phase diagram of the nanoparticles and their tendency to gel. Here we show how to tune the suspension state and hence its rheology. For decane, a good solvent for the hydrocarbon chains, gelation occurs at rather low volume fractions in the presence of phase separation. This is due to the interdigitation of solvent molecules with the grafted chains, resulting in their crystalline packing that promotes the attraction between particles. For toluene, a solvent of reduced quality for the hydrocarbon chains, no interdigitation takes place, and hence gelation is triggered by clustering at higher volume fractions before phase separation. Our results support the generic picture of complex kinetic arrest/phase separation interplay in soft matter, where phase separation can proceed, be interrupted or be completely inhibited. A number of interesting possibilities for tailoring the rheology of grafted colloidal systems emerge.

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Layered Organosilicate Nanoparticles with Liquidlike Behavior

Cited by 104 publications

References 15 publications

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

Self-assembly of organic-inorganic hybrid nanolayers: effect of endgroup polarity on nanostructures

Solvent-mediated pathways to gelation and phase separation in suspensions of grafted nanoparticles

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