Nanocomposites with Structure Domains of 0.5 to 3 nm by Polymerization of Silicon Spiro Compounds

Spange, Stefan; Kempe, Patrick; Seifert, Andreas; Auer, Alexander A.; Ecorchard, Petra; Lang, Heinrich; Falke, M.; Hietschold, Michael; Pohlers, Andreas; Hoyer, W.; Cox, Gerhard; Kockrick, Emanuel; Kaskel, Stefan

doi:10.1002/anie.200901113

Cited by 64 publications

(116 citation statements)

References 34 publications

Supporting

Mentioning

113

Contrasting

Order By: Relevance

“…, which is significantly lower than for silicon-based twin monomers (500-600 m 2 g À1 [16,18] ). Compared with TiO 2 or WO 3 , obtained from similar monomers, the surface areas are, however, in the same range.…”

mentioning

confidence: 89%

“…2,2'-Spirobi[4 H-1,3,2-benzodioxasiline] (SBS) was prepared according to a published procedure. [18] All thermal operations were performed in a Carbolite Tube Furnace MTF 12/38/400. H} NMR experiments were conducted using cross polarization (CP) and magic angle spinning (MAS) with spinning frequencies of 12.5 or 20 kHz.…”

Section: Experimental Section General Procedures and Starting Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Zirconium and Hafnium Twin Monomers for Mixed Oxides

et al. 2014

Self Cite

View full text Add to dashboard Cite

Carboxyl‐functionalized multiwalled carbon nanotubes (MWNT‐COOH) decorated with palladium (Pd) nanoparticles (NPs, Pd–MWNT‐COOH) are prepared by using a one‐pot thermal decomposition method without addition of reductant or surfactant. An increased ratio of the D band to G band in Raman spectra and a decreased ratio of oxygen‐containing groups measured using X‐ray photoelectron spectroscopy suggest the interaction between Pd NPs and carboxyl groups in Pd–MWNT‐COOH. TEM studies reveal improved dispersion of Pd NPs after introducing MWNT‐COOH or MWNTs; the carboxyl groups act as anchors to perfectly disperse Pd NPs in Pd–MWNT‐COOH, which is responsible for the highest peak current of Pd–MWNT‐COOH for the methanol oxidation reaction. The best catalytic performance is observed in conditions that afford a balanced adsorption between hydroxide and methanol through varying the concentrations of methanol and KOH. Increasing temperature can also improve the catalyst performance due to enhanced reaction kinetics.

show abstract

mentioning

confidence: 89%

Section: Experimental Section General Procedures and Starting Materialsmentioning

confidence: 99%

Zirconium and Hafnium Twin Monomers for Mixed Oxides

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…This technique was developed by Spange et al as a method for the preparation of high-surface-area metal oxides and nanoparticles [167], such as SiO 2 [168,169] and TiO 2 [170]. The concept underlying this synthetic route is based on the reaction of a well-defined metal-containing monomer leading to interpenetrating composite networks consisting, for example, of a metal oxide and a polymer (Scheme 9).…”

Section: Twin Polymerizationmentioning

confidence: 99%

The Power of Non-Hydrolytic Sol-Gel Chemistry: A Review

et al. 2017

View full text Add to dashboard Cite

This review is devoted to non-hydrolytic sol-gel chemistry. During the last 25 years, non-hydrolytic sol-gel (NHSG) techniques were found to be attractive and versatile methods for the preparation of oxide materials. Compared to conventional hydrolytic approaches, the NHSG route allows reaction control at the atomic scale resulting in homogeneous and well defined products. Due to these features and the ability to design specific materials, the products of NHSG reactions have been used in many fields of application. The aim of this review is to present an overview of NHSG research in recent years with an emphasis on the syntheses of mixed oxides, silicates and phosphates. The first part of the review highlights well known condensation reactions with some deeper insights into their mechanism and also presents novel condensation reactions established in NHSG chemistry in recent years. In the second section we discuss porosity control and novel compositions of selected materials. In the last part, the applications of NHSG derived materials as heterogeneous catalysts and supports, luminescent materials and electrode materials in Li-ion batteries are described.

show abstract

“…In the framework of twin polymerization first quantum chemical calculations have been utilized leading to a proton catalyzed model [38,39], which considers a single proton to act as a catalyst in the acid catalyzed TP. With the help of this model it was possible to identify the peculiar structure of the twin monomers containing bridging units of different stabilities between the organic and the inorganic components.…”

Section: Introductionmentioning

confidence: 99%