The utilization of dynamic covalent and noncovalent bonds in polymeric materials offers the possibility to regenerate mechanical damage, inflicted on material, is therefore great interest field self‐healing materials. For design a new class materials, methacrylate containing copolymers with acylhydrazones as reversible crosslinkers are utilized. polymer networks obtained by bulk polymerization an acylhydrazone crosslinker commercially available methacrylates comonomers fine‐tune T g systems....

Abstract Aromatic diimides such as naphthalene diimide (NDI) and pyromellitic (MDI) are important building blocks for organic electrode materials. They feature a two‐electron redox mechanism that allows energy storage. Due to the smaller size of MDI compared NDI its theoretical capacity is higher. Studies on MDI‐based small molecule linear polymer electrodes indicate unstable, yet origin instability remains unclear. Herein, two cross‐linked networks designed. The polymers, termed PNDI‐EG...

An organic−inorganic hybrid heterogeneous catalyst system was synthesized by covalently anchoring oxodiperoxo molybdenum complexes [(L−L)MoO(O2)2] (L−L = (3-triethoxysilylpropyl)[3-(2-pyridyl)-1-pyrazolyl]acetamide) onto the mesoporous silica MCM-41 (Si−MCM-41) and aluminosilicate (Al−MCM-41) materials. Characterization of functionalized materials powder X-ray diffraction (XRD), N2 adsorption, solid-state CP-MAS NMR spectroscopy (13C 29Si) demonstrates that are grafted successfully into The...

In part I, the concept of a temperature dependent domain stability map was developed for tetragonal ferroelectrics grown on cubic substrates. this paper, range experimental data populations in heteroepitaxial ferroelectric films is placed context map. Experimental shows that differential thermal expansion, cooling rate, and applied electric fields may be effectively used to control structure, particularly system PZT, PZT/YBCO/LaAlO3, LSCO/PLZT/LSCO/LaAlO3. It will shown misfit dislocations...

Two in one: A periodic mesoporous phenylene silica (PMO) with acidic framework walls and basic pore channels was obtained by using protecting-group techniques. This approach allows location of the groups hydrophobic benzene layers amine hydrophilic layers. The bifunctional material is an efficient catalyst for tandem conversion benzaldehyde dimethyl acetal into 2-nitrovinylbenzene (see scheme).

The utilization of metal–ligand interactions within polymers generates materials which are interest for several applications, including self-healing materials. In this work we use methacrylate copolymers containing terpyridine moieties in the side chain formation metallopolymer networks. were synthesized using reversible addition–fragmentation transfer (RAFT) polymerization technique and subsequent crosslinking by addition a metal salt, here cadmium(II) salts, with different counter-ions....

Interfacial defect theory is applied to the epitaxial ferroelectric system consisting of a tetragonal such as BaTiO3 or PbTiO3 grown onto cubic (001) substrate. The interfacial defects that result from diffusionless paraelectric (PE→FE) phase transition are treated under constraint no misfit dislocations generated during transition. domain pattern develops provide strain relief in film. for ...c/a1/c/a1... include coherency edge and wedge disclinations. ...a1/a2/a1/a2... screw dislocations....

Acid-base bifunctional mesoporous silica nanoparticles (MSN) were prepared by a one-step synthesis co-condensation of tetraethoxysilane (TEOS) and silanes possessing amino and/or sulfonic acid groups. Both the functionality morphology particles can be controlled. The grafted functional groups characterized using solid-state (29)Si (13)C cross-polarization/magic angle spinning (CP/MAS) NMR spectroscopy, thermal analysis, elemental whereas structural morphological features materials evaluated...

Lithium–sulfur (Li–S) batteries hold a promising position as candidates for next-generation high-energy storage systems. Here, we combine inverse vulcanization of sulfur with multiwalled carbon nanotubes (MWCNTs) to increase the conductivity cathode materials Li–S batteries. The mixing process inversely vulcanized copolymer networks MWCNTs is aided by shear in two-roll mill take advantage soft nature copolymer. high-throughput method demands source conductive that can be intimately mixed S...

A novel mesoporous MCM-41-type of hybrid material was synthesized by co-condensation tetraethyl orthosilicate and the chelate ligand (3-trimethoxysilylpropyl)[3-(2-pyridyl)-1-pyrazolyl]acetamide (1) in presence cetyltrimethylammonium bromide as template. Surfactant extraction produced materials with uniform mesoscale channels, large pore volumes, high specific surface areas. The preservation structure during hydrothermal synthesis acid process confirmed 13C CP-MAS NMR spectroscopy. Solid...

A common source: In a novel twin polymerization, single monomer is transformed into an organic–inorganic nanocomposite. For example, tetrafurfuryloxysilane polymerizes to form dense interpenetrating network of poly(furfuryl alcohol) and SiO2 (see picture). Nanoporous silicate, potentially other metal oxides, can be obtained when the organic components are removed. Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z504327_s.pdf or...

Two from one: It is possible to form two different, interpenetrating polymer structures—silicon dioxide and a phenolic resin—simultaneously in single step without the formation of by-products by using readily polymerizable, organic silicon spiro compound. This new polymerization process enables fabrication materials with domain sizes 0.5 3 nm.

Step aside, sol–gel! Nanoscale tungsten oxide with large BET surface area is available through the presented in situ twin polymerization method. In only one process step, nanostructured hybrid materials are synthesized from WCl6 and cationic polymerizable aryl methanols. This procedure forms a bridge between non-aqueous sol–gel opens new perspectives for synthesis of various metals oxides.

Pb(Mg 1/3 Nb 2/3 ) O 3 (PMN) alkoxide precursor solutions were synthesized and used to prepare thin films by spin coating on TiO2/Pt/TiO2/SiO2/Si substrates. Many parameters like the use of homogeneous stable appropriate processing greatly reduce presence nonferroelectric pyrochlore phase. Transmission electron microscopy investigations, dielectric, electrostrictive, direct current field induced piezoelectric measurements carried out have shown that PMN exhibit a relaxor-like behavior.

The pyroelectric properties of Pb1−xCaxTiO3 (x=0–0.3) thin films have been greatly improved by including porosity in the microstructure. Control nucleation and growth variation heating rate was used to process porous, low dielectric constant on platinized silicon wafers. Electrical characterization poled showed coefficients up ∼200 μC/m2 K permitivities as εr≈55. resulting high figure-of-merit p/εr combination with small losses 0.5%–2.0% at 1 kHz make good candidates for thin-film devices....

Von gleicher Herkunft: Eine neuartige Polymerisationsmethode (Zwillingspolymerisation) liefert organisch-anorganische Nanokomposite ausgehend von einem einzigen Monomer. Zum Beispiel ergibt Tetrafurfuryloxysilan sich durchdringende Netzwerke aus Polyfurfurylalkohol und SiO2 (siehe Bild). Durch Herauslösen der organischen Komponente sind poröse Silicate möglicherweise auch andere Metalloxide zugänglich.

Triethoxysilyl functionalized phenothiazinyl carbamates were synthesized and covalently grafted onto mesoporous MCM-41. XRD N2 adsorption measurements indicated the presence of a highly ordered two-dimensional hexagonal structure functional materials, while incorporation organic compounds in solid materials was proven by means 13C 29Si solid-state NMR spectroscopy as well FT-IR spectroscopy. Upon oxidation with (NO)BF4, stable phenothiazine radical cations generated pores which can be...

Zwei in Einem: Ein periodisches mesoporöses Phenylenkieselgel (PMO) mit sauren Wänden und basischen Poren wurde durch Anwendung von Schutzgruppentechniken synthetisiert. Auf diese Weise konnte eine präzise Lokalisierung der Säuregruppen den hydrophoben Phenylenschichten Aminogruppen an hydrophilen Kieselgeleinheiten erreicht werden. Das mesoporöse Material katalysiert die Tandemreaktion Benzaldehyddimethylacetal zu 2-Nitrovinylbenzol (siehe Schema).

A third twin: Homopolymers are formed by the copolymerization of two twin monomers. Using new method simultaneous polymerization, complex hybrid materials can be synthesized in a targeted manner (see scheme), which, depending upon combination monomers used, nanostructured with different compositions and properties obtained. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available...

Abstract Mesoporous organosilica materials with different contents of bistrialkoxysilyl imidazolium salts in the framework were synthesized by a one‐step synthesis. Textural characterization confirmed that morphology and surface properties imidazolium‐bridged organosilicas depended critically on amount organic groups framework, whereas solid‐state NMR showed fragments integrated covalently into framework. Further reaction these Pd(OAc) 2 , followed reduction NaBH 4 yielded palladium...

Abstract The twin monomer 2,2′‐spirobi[4 H ‐1,3,2‐benzodioxasiline] ( 1 ) can be polymerized to nanostructured SiO 2 /phenolic‐resin composite material by thermally induced polymerization. Thermally polymerization represents a way produce nanocomposites simply thermal induction of monomers. Besides , the reaction several related salicylic (2‐oxybenzylic) silicon molecules has been investigated. cleavage is studied using trapping reagents (e.g., vinyl compounds). A significant occurrence...

Abstract Spirocyclic silicon alkoxides were synthesized by reaction of Si(OMe) 4 with derivatives salicylic alcohol and studied in situ differential scanning calorimetry regard to twin polymerization (TP). Both, thermally induced proton‐assisted TP gave nanostructured hybrid materials composed a phenolic resin silica. Carbonization subsequent treatment HF (aq) resulted microporous carbon, whereas oxidation air provided mesoporous DFT calculations performed obtain more detailed insight into...