Ring-Opening Polymerization of a [1]Silaferrocenophane Within the Channels of Mesoporous Silica: Poly(ferrocenylsilane)-MCM-41 Precursors to Magnetic Iron Nanostructures

MacLachlan, Mark J.; Aroca, Patricia; Coombs, Neil; Manners, Ian; Ozin, Geoffrey A.

doi:10.1002/(sici)1521-4095(199801)10:2<144::aid-adma144>3.3.co;2-d

Cited by 51 publications

(89 citation statements)

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“…Ozin, Manners, and co-workers carried out a thermal in-situ ringopening polymerization of a silaferrocenophane inside the channels of MCM-41. [153] The polymerization products remained predominantly inside the pores.…”

Section: Polymer Synthesesmentioning

confidence: 99%

Hybrid Inorganic-Organic Mesoporous Silicates—Nanoscopic Reactors Coming of Age

2000

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This review describes methods of preparing hybrid inorganic–organic mesoporous silicates with uniform channel structures, as well as some of their applications. Both reactive and passive organic groups can be incorporated in the porous solids by grafting methods or by co‐condensation under surfactant control. Functional groups have been placed selectively on the internal or external pore surfaces or even within the walls of the mesoporous solids. Organic functionalization of these solids permits tuning of the surface properties (hydrophilicity, hydrophobicity, binding to guest molecules), alteration of the surface reactivity, protection of the surface from attack, and modification of the bulk properties (e.g., mechanical or optical properties) of the material. Recent applications of hybrid mesoporous silicates are highlighted, including catalysis, sorption of metals, anions, and organics, reactors for polymerization, fixation of biologically active species, and optical applications.

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Section: Polymer Synthesesmentioning

confidence: 99%

Hybrid Inorganic-Organic Mesoporous Silicates—Nanoscopic Reactors Coming of Age

2000

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“…[3] They may also serve as hosts for monodisperse ceramic, semiconductor, [4] metallic, [5] and magnetic nanomaterials. [6] In 1992, the report of liquid-crystal templating by Kresge and coworkers [7] initiated a surge of research into mesoporous silica and ªchemistry in the channelsº. As a consequence of their uniform pore sizes, which can be tuned between 2±10 nm, these materials have been used to host a variety of organic, inorganic, organometallic, and polymeric guests.…”

Section: Introductionmentioning

confidence: 99%

Oriented Periodic Mesoporous Organosilica (PMO) Film with Organic Functionality Inside the Channel Walls

et al. 2001

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The first examples of an oriented periodic mesoporous organosilica (PMO) film, containing a variety of organic groups (ethane, ethene, benzene, thiophene) inside the channel walls, are reported. The mesostructure of the PMO film appears oriented with respect to the surface of the underlying glass substrate. Liquid‐crystal topological defects in the precursor gels are replicated in the resulting PMO film and are evident in polarized optical microscopy images, recorded between crossed‐polarizers, which show fan‐type optical birefringence texture characteristic of the mesostructure.

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“…The resulting powders contain ferromagnetic iron particles within the Sic-C-Si,N, matrix. We have shown that pyrolysis of nanoscale cylinders of PFS in hexagonal mesoporous silica at 900°C yields iron nanocrystals with a diameter constrained by the width of the channels (20).…”

mentioning

confidence: 98%

“…A PXRD pattern of the CPPN displays two sharp reflections at 20 = 12.81' . 20) corresponding to diffraction coherence between iron centers in the cross-linked polymer network. (0 is the angle of incidence of the x-ray beam on the sample, and d is the lattice spacing.)…”

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confidence: 99%

Shaped Ceramics with Tunable Magnetic Properties from Metal-Containing Polymers

MacLachlan

Ginzburg

Coombs

et al. 2000

Science

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272

155

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A shaped, magnetic ceramic was obtained from a metal-containing polymer network, which was synthesized by thermal polymerization of a metal-containing organosilicon monomer. Pyrolysis of a cylinder, shape, or film of the metal-containing polymer precursor produced a low-density magnetic ceramic replica in high yield. The magnetic properties of the shaped ceramic could be tuned between a superparamagnetic and ferromagnetic state by controlling the pyrolysis conditions, with the particular state dependent on the size of iron nanoclusters homogeneously dispersed throughout the carbosilane-graphitic-silicon nitride matrix. These results indicate that cross-linked metal-containing polymers may be useful precursors to ceramic monoliths with tailorable magnetic properties.

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Ring-Opening Polymerization of a [1]Silaferrocenophane Within the Channels of Mesoporous Silica: Poly(ferrocenylsilane)-MCM-41 Precursors to Magnetic Iron Nanostructures

Cited by 51 publications

References 0 publications

Hybrid Inorganic-Organic Mesoporous Silicates—Nanoscopic Reactors Coming of Age

Hybrid Inorganic-Organic Mesoporous Silicates—Nanoscopic Reactors Coming of Age

Oriented Periodic Mesoporous Organosilica (PMO) Film with Organic Functionality Inside the Channel Walls

Shaped Ceramics with Tunable Magnetic Properties from Metal-Containing Polymers

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