Liquid-crystalline phases as templates for the synthesis of mesoporous silica

Attard, George S.; Glyde, Joanna C.; Göltner, Christine G.

doi:10.1038/378366a0

Cited by 1,098 publications

(845 citation statements)

References 13 publications

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“…In the latter, surface silanol groups on silicate precursors in a preformed ªsilicatropicº liquid crystal are considered to be responsible for the organization of surfactant molecules into the templating mesophase. [40,41] However, formation of a mesoporous silica in the absence of water or other solvents has not been reported to the best of our knowledge. This reveals the crucial importance of the Ti w O x (OH) y -(OEt) z nanocluster±surfactant interactions, which are in the case of silica much weaker, and for the true liquid-crystal mechanism restricted to hydrogen-bonding.…”

Section: Resultsmentioning

confidence: 95%

Solventless Acid‐Free Synthesis of Mesostructured Titania: Nanovessels for Metal Complexes and Metal Nanoclusters

Dag¹,

Soten

Çelik

et al. 2003

Adv Funct Materials

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A new and highly reproducible method to obtain mesostructured titania materials is introduced in this contribution. The mesostructured titania is obtained by employing self‐assembled structures of non‐ionic alkyl‐poly(ethylene oxide) surfactants as templates. The materials are produced without additional solvents such as alcohols, or even water. Only the titanium(IV) ethoxide and the surfactant (C12EO10) are needed. Water, in the form of that attached to the surfactant and from the atmosphere, induces growth of titania nanoclusters in the synthesis sol. It is indicated that these nanoclusters interact with the surfactant EO‐head groups to form a new titanotropic amphiphile. The new amphiphiles self‐assemble into titanium nanocluster–surfactant hybrid lyotropic phases, which are transformed to the final mesostructured materials by further condensation of the titania network. The titania materials can be obtained also with noble‐metal particles immobilized in the mesostructured framework. It is seen that when different metal salts are used as the metal precursors, different interactions with the titania walls are found. The materials are characterized by X‐ray diffraction (XRD), polarization optical microscopy (POM), transmission electron microscopy (TEM), UV‐vis spectroscopy, and micro‐Raman analysis.

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Section: Resultsmentioning

confidence: 95%

Solventless Acid‐Free Synthesis of Mesostructured Titania: Nanovessels for Metal Complexes and Metal Nanoclusters

Dag¹,

Soten

Çelik

et al. 2003

Adv Funct Materials

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“…Subsequently, the templates were heated at 85 °C for 2 h and at 130 °C for 3 h, respectively, in the presence of 0.05 mL of 1H,1H,2H,2H-perfluorodecyltrichlorosilane (97%, ABCR GmbH). Mesoporous SBA-15 precursor solutions were prepared according to protocols reported in the literature [2,9,10]. A typical procedure involves mixing TEOS (99+ %, Alfa Aesar), EO 20 PO 70 EO 20 (BASF, weight-average molecular weight Mw = 5800 g mol-1, Pluronic P123), 1.0 M HCl(aq) and ethanol as described elsewhere [9,10].…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4][5] However, their integration into device architectures still remains a challenge. Recent efforts have focused on the synthesis of MCM (Mobil Crystalline Material) [6,7] and SBA (Santa Barbara amorphous) type [6,[8][9][10][11][12][13]] materials inside porous supports characterized by straight, aligned pores oriented normal to the surface.…”

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confidence: 99%

Ordered Arrays of Mesoporous Microrods from Recyclable Macroporous Silicon Templates

et al. 2006

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Ordered arrays of freestanding mesoporous microrods (see figure) are obtained from macroporous silicon templates with hydrophobized pore walls. The microrods can be removed from the template by simple mechanical lift‐off. Since no wet‐chemical etching step is involved, condensation of the rods is avoided and the template can be recycled. The hierarchical structures combine features on the nano‐ and microscale and have a well‐controlled geometry.

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“…If the liquid phase micelles are combined with an electrochemical technique, the formation of nano-structures can selectively occur on a conductive substrate. Application of this technique for highsurface area battery materials was proposed by Attard et al , [ 170 ] and was proven to be an attractive method to yield porous fi lms of silica, [ 171 ] platinum, [ 170 , 172 ] tin [ 170 , 173 ] and nickel oxides [ 174 , 175 ] with a signifi cantly increased surface area. The pore size is in most cases very small, usually below 100 nm.…”

Section: Three-dimensional Architectures Based On Aerogelsmentioning

confidence: 99%

All‐Solid‐State Lithium‐Ion Microbatteries: A Review of Various Three‐Dimensional Concepts

Oudenhoven

Baggetto

Notten

2010

Advanced Energy Materials

699

638

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With the increasing importance of wireless microelectronic devices the need for on-board power supplies is evidently also increasing. Possible candidates for microenergy storage devices are planar all-solid-state Li-ion microbatteries, which are currently under development by several start-up companies. However, to increase the energy density of these microbatteries further and to ensure a high power delivery, three-dimensional (3D) designs are essential. Therefore, several concepts have been proposed for the design of 3D microbatteries and these are reviewed. In addition, an overview is given of the various electrode and electrolyte materials that are suitable for 3D all-solidstate microbatteries. Furthermore, methods are presented to produce fi lms of these materials on a nano-and microscale.www.MaterialsViews.com REVIEW www.advenergymat.de

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Liquid-crystalline phases as templates for the synthesis of mesoporous silica

Cited by 1,098 publications

References 13 publications

Solventless Acid‐Free Synthesis of Mesostructured Titania: Nanovessels for Metal Complexes and Metal Nanoclusters

Solventless Acid‐Free Synthesis of Mesostructured Titania: Nanovessels for Metal Complexes and Metal Nanoclusters

Ordered Arrays of Mesoporous Microrods from Recyclable Macroporous Silicon Templates

All‐Solid‐State Lithium‐Ion Microbatteries: A Review of Various Three‐Dimensional Concepts

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