In situ synchrotron small-angle X-ray scattering study of MCM-41 crystallisation using Gemini surfactants

Gianotti, Enrica; Berlier, Gloria; Costabello, K.; Coluccia, Salvatore; Meneau, Florian

doi:10.1016/j.cattod.2006.08.064

Cited by 18 publications

(13 citation statements)

References 31 publications

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“…Many examples of soft templating use also ionic amphiphiles [108]. For example, a time-resolved synchrotron SAXS study investigated the synthesis of MCM-41 materials starting from a self-assembly process involving a Gemini (C16-4-16) surfactant as template [109]. Moreover the time-resolved, contrast-matched SANS investigation of Hollamby et al [110] has shown the formation mechanisms of mesoporous silica nanoparticles (MSNs) in presence of CTAB amphiphiles.…”

Section: Amphiphiles As Templates For the Synthesis Of Mesoporous Nanmentioning

confidence: 99%

Amphiphiles Self-Assembly: Basic Concepts and Future Perspectives of Supramolecular Approaches

Lombardo

Киселев

Magazù

et al. 2015

Advances in Condensed Matter Physics

416

256

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Amphiphiles are synthetic or natural molecules with the ability to self-assemble into a wide variety of structures including micelles, vesicles, nanotubes, nanofibers, and lamellae. Self-assembly processes of amphiphiles have been widely used to mimic biological systems, such as assembly of lipids and proteins, while their integrated actions allow the performance of highly specific cellular functions which has paved a way for bottom-up bionanotechnology. While amphiphiles self-assembly has attracted considerable attention for decades due to their extensive applications in material science, drug and gene delivery, recent developments in nanoscience stimulated the combination of the simple approaches of amphiphile assembly with the advanced concept of supramolecular self-assembly for the development of more complex, hierarchical nanostructures. Introduction of stimulus responsive supramolecular amphiphile assembly-disassembly processes provides particularly novel approaches for impacting bionanotechnology applications. Leading examples of these novel self-assembly processes can be found, in fact, in biosystems where assemblies of different amphiphilic macrocomponents and their integrated actions allow the performance of highly specific biological functions. In this perspective, we summarize in this tutorial review the basic concept and recent research on self-assembly of traditional amphiphilic molecules (such as surfactants, amphiphile-like polymers, or lipids) and more recent concepts of supramolecular amphiphiles assembly which have become increasingly important in emerging nanotechnology.

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Section: Amphiphiles As Templates For the Synthesis Of Mesoporous Nanmentioning

confidence: 99%

Amphiphiles Self-Assembly: Basic Concepts and Future Perspectives of Supramolecular Approaches

Lombardo

Киселев

Magazù

et al. 2015

Advances in Condensed Matter Physics

416

256

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“…where Avrami parameters K and n are related to the nucleation type and the growth mechanism. [25][26][27][28][29] In our case, a(t) is obtained from the integrated intensity I(t) (normalized by its maximum) for a specific time-resolved GISAXS reflection of the silicate-CTAB film. In the Sharp-Hancock (SH) presentation 27 ln [ln(1 2 a) 21 ] = n ln(t 2 t 0 ) + ln K…”

Section: Avrami Analysis Of Gisaxs Datamentioning

confidence: 99%

Interplay of formation kinetics for highly oriented and mesostructured silicate–surfactant films at the air–water interface

et al. 2013

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Kinetic details of mesostructured silicate-surfactant films formed at the air-water interface of acidic solutions of cetyltrimethylammoium bromide and tetraethyl orthosilicate were systematically studied. Time-resolved grazing-incident small-angle X-ray scattering was adopted to capture the formation kinetics of the free-standing films comprising mesostructured silicate channel domains highly oriented to the airwater interface. Evolutions of the ordered domain size and phase volume are interpreted on the basis of the Avrami analysis, from which intermediate phases and corresponding phase transitions (as modulated by temperature, pH level, and/or composition) during film formation were quantitatively identified.Extracted kinetic parameters, complemented with the rate constant of silicate hydrolysis obtained via Raman spectroscopy, revealed details of the dynamic interplay between silicate polymerization and inorganic-organic self-assembling. Effects of the air-water interface on the formation of the silicatesurfactant films were illustrated in terms of the highly oriented mesostructure, the greatly enhanced kinetics characterized by sporadic nucleation and diffusion-controlled growth, and the reduced activation energy for silicate polymerization, in sharp contrast to solutions without the air-water interface. A schematic diagram of the free energy vs. surfactant headgroup area is constructed to correlate the observed kinetics pathways for mesostructure formation during film fabrication at the air-water interface.Advantages of the interface coupling with either air-water or solution-substrate on film formation are discussed.

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“…Mesoporous materials can also be formed using a solution of silica and surfactants as templates and as the samples crystallize isotropically the Avrami-Eremov formalism can be applied to describe the crystallization process. 293 A similar technique, using a template of block copolymer microdomain structures, was applied to produce Pd nanoparticles. 294 The development of the particle size distribution was followed with a time resolution of the order of seconds on a conventional X-ray source confirming, if need be, that certainly with strong scatterers, not all timeresolved experiments require a SR source.…”

Section: Inorganic and Mixed Systemsmentioning

confidence: 99%

Synchrotron radiation studies of non-crystalline systems

Koch

Bras

2008

Annu. Rep. Prog. Chem., Sect. C: Phys. Chem.

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In situ synchrotron small-angle X-ray scattering study of MCM-41 crystallisation using Gemini surfactants

Cited by 18 publications

References 31 publications

Amphiphiles Self-Assembly: Basic Concepts and Future Perspectives of Supramolecular Approaches

Amphiphiles Self-Assembly: Basic Concepts and Future Perspectives of Supramolecular Approaches

Interplay of formation kinetics for highly oriented and mesostructured silicate–surfactant films at the air–water interface

Synchrotron radiation studies of non-crystalline systems

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