Elongated Silica Nanoparticles with a Mesh Phase Mesopore Structure by Fluorosurfactant Templating

Tan, Bing; Dozier, Alan; Lehmler, Hans‐Joachim; Knutson, Barbara L.; Rankin, Stephen E.

doi:10.1021/la049474s

Cited by 58 publications

(75 citation statements)

References 33 publications

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“…In this communication, we have reported the synthesis of spherical hollow silica particles with a single layer of mesopores in their shells through a surfactant-templated sol±gel process. The recipe of this sample is similar to one reported previously, which gives silica with a mesh-phase structure, [12] except that the surfactant concentration is much lower, and the stirring rate is controlled more exactly. The absence of vesicles in prior studies of the phase behavior of the surfactant in water (without TEOS) suggests that the hollow particles form by co-assembly of fluorinated-surfactant micelles with silica.…”

Section: Fsv-s3mentioning

confidence: 90%

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Fluorinated‐Surfactant‐Templated Synthesis of Hollow Silica Particles with a Single Layer of Mesopores in Their Shells

et al. 2005

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ence electrodes. Films were inserted into a home-built sample holder, with an air-filled gas-phase volume of 0.326 cm 3 encapsulated between the electrode and the polymer film/glass substrate using a 20 mm diameter Viton O'-ring spacer. Six UVA 365 ± 25 nm fluorescent tubes (8W BLB, I = 5.96 mW cm ±2 ) arranged in a semicircle and placed 13 cm above the cell, facing the cell, were used as the irradiation source, resulting in a sample irradiance of 4.8 mW cm ±2 , similar to the intensity of UVA solar irradiance. A fan was used to prevent the cell from heating up due to the heat from the irradiation source. SEM images were obtained with a Philips XL-30 field-emission scanning electron microscope. Samples were coated with Au/Pd prior to observation. For TAS measurements, a PTI GL-3300 N 2 -laser (337 nm, 30 lJ cm ±2 , repetition rate of 0.8 Hz) was used as the excitation source [5]. X-ray diffraction analysis of the Degussa P25 and P90 materials showed that both materials consist of TiO 2 anatase and rutile particles, the anatase contents being 81 % and 90 % for P25 and P90, respectively. The crystal domain size of the anatase particles was estimated as 20 nm for TiO 2 P25 and 13 nm for TiO 2 P90.

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Section: Fsv-s3mentioning

confidence: 90%

“…The surfactant and materials synthesis procedures were similar to the procedures reported previously [11,12]. The initial quantities of reagents were 0.167 g HFDePC, 23.67 g de-ionized ultrafiltered water, 1.28 g concentrated aqueous ammonia (29 wt.-%), and 1.817 g TEOS.…”

Section: Methodsmentioning

confidence: 99%

Fluorinated‐Surfactant‐Templated Synthesis of Hollow Silica Particles with a Single Layer of Mesopores in Their Shells

et al. 2005

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“…The required amount of concentrated aqueous ammonia was added to the solution and after one hour of stirring at room temperature, the silica precursor was added dropwise with stirring. Because of the slow reaction rate of TBOS and the small particle size produced with this precursor, the as-synthesized sample prepared with TBOS was collected by centrifugation after aging the solution for 3 d. All other samples were collected by filtering after aging for 1 d. The surfactant was extracted using acidic ethanol as described previously [62].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Inorganic and Organic–Inorganic Hybrid Hollow Particles Using a Cationic Surfactant with a Partially Fluorinated Tail

Tan

Vyas

Lehmler

et al. 2007

Adv Funct Materials

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A new partially fluorinated cationic surfactant, 1‐(10‐perfluorooctyldecyl)pyridinium bromide monohydrate, is synthesized and used as the template for mesoporous ceramic and inorganic–organic hybrid particles. Several hydrolyzed alkoxide precursors are shown to co‐assemble with this surfactant to form hollow vesicle‐like particles, and the effect of changing the alkoxide chemical structure on the formation of these particles is examined. Tetramethoxysilane produces cubic or columnar particles without hollow cavities, but all other tetra‐n‐alkoxysilanes tested up to the n‐butoxide produce hollow particles. As the alkoxide length increases, the shell structure changes from multilayered (with Si(OC2H5)4) to a single thin layer (with Si(OC3H7)4) to a single thick layer (with Si(OC4H9)4). The stability of the fluorocarbon bilayers allows similar vesicular structures to be obtained in organic–inorganic hybrids prepared with bridged alkoxysilanes. Ethylene‐bridged silanes display similar structures to tetraalkoxysilanes. However, the hollow structures appear to partially collapse when the bridging chain is too long (octylene) and no hollow particles are formed with bis(trialkoxysilylpropyl)amines.

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“…While the "sol/ gel" transition and network structure of WLMs solutions has been exploited by several workers to build-up nanofibers [61], silica nanoparticles [62,63], and porous nanostructured materials [64], it is expected that SWLMs would be advantageous in bringing more control on the sol-gel transition, rather than relying on temperature alone to bring the transition [65].…”

Section: Templatingmentioning

confidence: 99%

Applications of Smart Wormlike Micelles

Feng¹,

Chu

Dreiss

2015

SpringerBriefs in Molecular Science

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The end purpose of formulating smart wormlike micelles is undoubtedly to use them for practical applications. Their micellar structure and reversibly switchable viscoelastic properties offer opportunities for uses where controllable encapsulation and thickening are needed. A series of potential applications are described in this chapter, including biomedicine, cleaning, as electrorheological and photorheological fluids, for templating, and drag reduction, amongst others. However, the only current success stories of SWLMs commercial applications come from oil well stimulation processes, including as clean fracturing fluids and for self-diverting acidizing, which are discussed at length in this chapter.Keywords Applications of SWLMs · Oil well stimulation · Clean fracturing fluids · Self-diverting acidizing · Drag reduction · Biomedicine · Electrorheological fluids · Photo-rheological fluidsThe field of stimuli-responsive materials, in particular applied to hydrogels, has grown considerably over the past decade [1]. A plethora of "intelligent" nanostructured systems has emerged and been proposed for a wide range of applications, for instance, in electronic devices, as "smart" optical systems [2], micro-electromechanical systems, in coatings, and quite significantly in the biomedical field for drug delivery, diagnostics, bioseparation, as biosensors, and artificial organs and tissues [1][2][3]. Traditionally, these materials have been based predominantly on polymers; however, as previous chapters have shown, smart WLMs can display properties of "soft" gels, as a result of their entanglements [4][5][6][7]. Their micellar nature provides an opportunity for encapsulation and release, particularly relevant to the areas of drug delivery, the liberation of perfumes or to cleaning processes.Being still a very young field, applications of SWLMs as such are still largely speculative. While many of the advances discussed in this book respond to specific needs and are driven by a final use, they have not yet reached commercialization. Perhaps the only success stories of scale-up applications originate from the oil industry, where SWLMs have been extensively used in the various stages of the process,

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Elongated Silica Nanoparticles with a Mesh Phase Mesopore Structure by Fluorosurfactant Templating

Cited by 58 publications

References 33 publications

Fluorinated‐Surfactant‐Templated Synthesis of Hollow Silica Particles with a Single Layer of Mesopores in Their Shells

Fluorinated‐Surfactant‐Templated Synthesis of Hollow Silica Particles with a Single Layer of Mesopores in Their Shells

Synthesis of Inorganic and Organic–Inorganic Hybrid Hollow Particles Using a Cationic Surfactant with a Partially Fluorinated Tail

Applications of Smart Wormlike Micelles

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