Ordered mesoporous silica fibers: effects of synthesis conditions on fiber morphology and length

Seshadri, S. K.; Alsyouri, Hatem M.; Lin, Jerry Y S

doi:10.1007/s10853-013-7515-2

Cited by 3 publications

(6 citation statements)

References 25 publications

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“…Among these influences are solvent evaporation and surfactant packing. Seshadri et al have recently reported that increased evaporation of water and alcohol at the interface is a key parameter for changing local concentrations and the degree of surfactant packing in interfacial growth [ 47 ]. The inferior pore order observed at high nitric acid contents and with sulfuric acid can be attributed to this phenomenon.…”

Section: Resultsmentioning

confidence: 99%

“…The slow diffusion of the TBOS species at the interface balanced with proper speed of condensation and restructuring causes their immediate consumption in the water phase at the interfacial region and yields seeds that grow linearly into fiber shapes [ 37 ]. In a recent work, we demonstrated that mixing the water phase during TBOS diffusion changes the linear growth and yields three-dimensional (3D) gyroidal shapes [ 47 ]. A similar morphology was seen quiescently using TEOS.…”

Section: Resultsmentioning

confidence: 99%

“…This reduces the diffusion of TEOS and gives linear supply and linear shapes in agreement with our suggestion of slow vs. facilitated diffusion. We have recently demonstrated that mixing of the water phase while quiescent interfacial growth using TBOS alters the linear supply of TBOS and leads to gyroidal shapes [ 47 ]. When employing a neutral surfactant, growth shifts to the bulk region both for TBOS and TEOS sources.…”

Section: Resultsmentioning

confidence: 99%

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Ordered mesoporous silica prepared by quiescent interfacial growth method - effects of reaction chemistry

et al. 2013

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Acidic interfacial growth can provide a number of industrially important mesoporous silica morphologies including fibers, spheres, and other rich shapes. Studying the reaction chemistry under quiescent (no mixing) conditions is important for understanding and for the production of the desired shapes. The focus of this work is to understand the effect of a number of previously untested conditions: acid type (HCl, HNO3, and H2SO4), acid content, silica precursor type (TBOS and TEOS), and surfactant type (CTAB, Tween 20, and Tween 80) on the shape and structure of products formed under quiescent two-phase interfacial configuration. Results show that the quiescent growth is typically slow due to the absence of mixing. The whole process of product formation and pore structuring becomes limited by the slow interfacial diffusion of silica source. TBOS-CTAB-HCl was the typical combination to produce fibers with high order in the interfacial region. The use of other acids (HNO3 and H2SO4), a less hydrophobic silica source (TEOS), and/or a neutral surfactant (Tweens) facilitate diffusion and homogenous supply of silica source into the bulk phase and give spheres and gyroids with low mesoporous order. The results suggest two distinct regions for silica growth (interfacial region and bulk region) in which the rate of solvent evaporation and local concentration affect the speed and dimension of growth. A combined mechanism for the interfacial bulk growth of mesoporous silica under quiescent conditions is proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ordered mesoporous silica prepared by quiescent interfacial growth method - effects of reaction chemistry

et al. 2013

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Section: Introductionmentioning

confidence: 99%

“…The large diameters of the channels and their tailorability provide new opportunities to accommodate macromolecules which optimize the interaction between the polymer and the inorganic phase, thus affording composites with improved properties compared to other inorganic nanomaterials. [8][9][10][11][12] This overview tries by no means to be complete, containing all existing and important polymer-mesoporous silica nanocomposites that have been published from 2000 to 2017. This review will show characterization, crystallization behavior, materials properties, and rheology of polymer-mesoporous silica hybrid nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

A review on new mesostructured composite materials: Part II. Characterization and properties of polymer–mesoporous silica nanocomposite

Salimian

Ali

Mohammadi

2018

Journal of Reinforced Plastics and Composites

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Hybrid inorganic–organic materials are promising systems for a variety of applications due to their extraordinary properties with intricate composite architectures composed of nanoscale inorganic moieties with organic polymers synergistically intertwined to provide both useful functionality and mechanical integrity. These materials have a high potential for future applications and therefore attract considerable interest in polymer science research during the last years. Among the various explored inorganic nanostructures, the mesoporous silica has been considered as a fascinating material to construct novel ordered and well-dispersed nanocomposites due to their high surface areas, periodic and size-controllable pore channels. This review is written with the intention to give an overview of the characterization and material properties of polymer–mesoporous silica nanocomposites. Among polymer–mesoporous silica composites, various categories including polyaniline, polypyrrole, polystyrene, polypropylene, polyethylene, epoxy, rubber, and acrylate polymer were discussed in detail.

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Effect of stirring rate on the morphology of FDU-12 mesoporous silica particles

Meoto

Kent

Nigra

et al. 2017

Microporous and Mesoporous Materials

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Ordered mesoporous silica fibers: effects of synthesis conditions on fiber morphology and length

Cited by 3 publications

References 25 publications

Ordered mesoporous silica prepared by quiescent interfacial growth method - effects of reaction chemistry

Ordered mesoporous silica prepared by quiescent interfacial growth method - effects of reaction chemistry

A review on new mesostructured composite materials: Part II. Characterization and properties of polymer–mesoporous silica nanocomposite

Effect of stirring rate on the morphology of FDU-12 mesoporous silica particles

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