Release from Silica SBA‐3‐like Mesoporous Fibers: Cross‐Wall Transport and External Diffusion Barrier

Stempniewicz, Magdalena; Rohwerder, Michael; Marlow, Frank

doi:10.1002/cphc.200600408

Cited by 21 publications

(26 citation statements)

References 47 publications

(54 reference statements)

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“…A TEM image (Figure 2 c) depicts the ordered pore structure of the fibers, which corresponds to a 2D hexagonal mesostructure of p6mm symmetry. The ordered pores extend along the fiber axis in a helical or circular fashion as revealed by microscopy [ 39 ] and diffusional investigations [ 38 , 40 ]. Such architecture is interesting in catalysis and controlled release applications.…”

Section: Resultsmentioning

confidence: 99%

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%

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

et al. 2013

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“…However, a further porosity, distinctively smaller than that of the mesoporosity related to the local ordering, was found at this length scale. [14][15][16][17] Although these additional pores may be crucial for many properties of the structure, their formation and detailed characteristics are rather unclear. They are mostly regarded as fine connections between the larger mesopores, without any ordering at larger length scales.…”

Section: Circulites 21 Particle Shapes and Structuresmentioning

confidence: 99%

“…This has, however, been excluded by the proof of transport perpendicular to the main pores. 16,17 Quantitatively one finds for such a model:…”

Section: Properties Of Hierarchical Structuresmentioning

confidence: 99%

Circular mesostructures: solids with novel symmetry properties

2007

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Mesoporous structures are more than just materials with pores (2 nm , d meso , 50 nm) bigger than micropores (d micro , 2 nm). They show new structures, shapes and symmetries that induce new properties and reveal unexpected applications. This work starts with a comprehensive description of one especially-perfect class of mesoporous structures (circulites), exhibiting circularly arranged pores which represent a novel symmetry behavior. It is shown that these structures are, from a more systematic point of view, strictly-defined hierarchies. They can serve as a prototype for the description and formation of hierarchical structures. Here, coiling is used as a general approach to the assembly of hierarchies. The control and design of hierarchical structures are the ultimate aims and have been achieved for this hierarchy type. We show that surfaces can be used for the selection of the hierarchy type, position control and alignment of the resulting particles. A molecular structuring of the support leads to pixel-like, highly-defined growth of a hierarchical arrangement containing 4 hierarchy levels. Finally, the properties of the hierarchies can be very specific, as shown by the guest transport behavior.

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“…Electrolytic co-deposition can also be used to design self-healing anticorrosive coatings. The microcapsules that contain corrosion inhibitors may be added to composite coatings by means of this method [12]. The main applications of self-healing materials nowadays in construction industry summarize as follows:…”

Section: Introductionmentioning

confidence: 99%

Application of self-healing materials in architecture and construction industry: an exploratory review

2020

JXAT

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This work's aim was to perform a review of the scientific literature from the standpoint of both the architect and builder. In the first place, on which self-healing materials are currently available for construction industry; secondly, to acknowledge the main applications and the self-healing methods of each material. The review was largely carried out using the scientific database tool sciencedirect ® and other similar tools on the main applications of self-healing materials in construction industry. The results reveal that the main applications refer to the production of self-healing concretes and mortars by means of self-healing techniques, for example: insertion of microcapsules with various self-healing agents, followed by self-healing bacteria. It is concluded that with the use of these materials not only does the service life of structures of buildings improves, but also that of the entire building, increasing durability and noticeably decreasing maintenance and reparation costs.

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Release from Silica SBA‐3‐like Mesoporous Fibers: Cross‐Wall Transport and External Diffusion Barrier

Cited by 21 publications

References 47 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

Circular mesostructures: solids with novel symmetry properties

Application of self-healing materials in architecture and construction industry: an exploratory review

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