Abstract Zinc oxide in the form of nanoscale materials can be regarded as one most important semiconductor oxides at present. However, question how chemical defects influence properties zinc has seldom been addressed. In this paper, we report on introduction into ZnO, their comprehensive analysis using a combination techniques (powder X‐ray diffraction (PXRD), absorption spectroscopy/extended fine structure (XAS/EXAFS), electron paramagnetic resonance (EPR), magic‐angle spinning nuclear...

Colonization of surfaces by microorganisms is an urging problem. In combination with the increasing antibiotic resistance pathogenic bacteria, severe infections are reported more frequently in medical settings. Therefore, there a large demand to explore innovative surface coatings that provide intrinsic and highly effective antibacterial activity. Materials containing silver nanoparticles have been developed past for this purpose, but solution has come into criticism due various...

”Systematic errors”, namely, oxygen vacancy sites in ZnO, are the active centers for hydrogenation of CO to give methanol. Nanocrystalline ZnO with a high density vacancies was prepared from special organometallic precursors, and its catalytic properties methanol synthesis were studied. Supporting information this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z503068_s.pdf or author. Please note: The publisher not responsible content functionality any...

Nanocasting, the 3D-transformation of self-assembled organic nanostructures into hollow inorganic replicas under preservation fine structural details has recently turned out to be a versatile tool, both for synthesis porous media with new pore topology as well characterization assembled structures themselves. This review gives on recent work describing potential and restrictions nanocasting using surfactants, polymers, colloids supramolecular tectons porogens.

The main ability of amphiphilic molecules is to alter the energy interfaces. They aid in formation various materials characterized by a high surface volume ratio. Furthermore, amphiphiles tend self-organize into structures higher complexity. In current study anionic surfactants containing purely inorganic multinuclear head group polytungstate type R-[PW11O39]3− were synthesized. Alkyl chains different length attached via siloxy bridges. counterions could be varied. Ultimately, heteropolyacid...

Abstract The shape of a crystalline particle can be defined by characteristic set and abundance surfaces corresponding to the lattice planes [ hkl ] crystal. structure, density, electronic system, energy each ]‐surface is different from others. Consequently, every morphology also characterized unique free compared alternative shapes at constant surface‐to‐volume ratio. Using tools geometrical crystallography, an attempt made describe systems in terms landscapes. It obvious that, similar...

Defects among the grains of MOF polycrystalline membranes lead to non-selective gas transport, thereby reducing their selectivity in separation. In this work, ZIF-62 with a well-intergrown structure were prepared on MXene modified supports. Subsequent thermal treatment transformed into glass membranes, effectively eliminating defects at grain boundaries. Due incorporation film and vertical positioning support during solvothermal process, only minimal portion melt infiltrated porous support....

[15] This is a high-concentration synthesis in which the solidified inorganic compound copy of original phase structure, that its structure predetermined by selection template phase. They used lyotropic liquid-crystalline phases, derived from surfactants or–later–block copolymers, [15±17]

Abstract ZnO can be regarded as one of the most important metal oxide semiconductors for future applications. Similar to silicon in microelectronics, it is not only obtain nanoscale building blocks ZnO, but also extraordinary purity has ensured. A new gas‐phase approach size‐selected, nanocrystalline particles presented. The tetrameric alkyl‐alkoxy zinc compound [CH 3 ZnOCH(CH ) 2 ] 4 chemically transformed into and mechanism transformation studied detail. Furthermore, morphological genesis...

To create materials that are composites or hybrids structured on the nanometer scale meso-domain, respectively, is one of major tasks in modern science. In this paper, we demonstrate general strategies how to obtain these nanocomposites founded knowledge about ordered mesoporous materials. One strategy involves formation composite by performing a chemical reaction pores pre-formed silica while other uses compounds first mold their porous environment and succeeding step react final composite....

Abstract Transition‐metal‐oxide materials possessing ordered mesoporosity have recently attracted significant research interest due to their numerous potential applications. Among them, mesoporous zinc oxide (ZnO) is a very tempting material because of the importance ZnO in heterogeneous catalysis. Here, first results preparation by using different templates are reported. Porous with high surface area, pore sizes, and nanocrystalline walls were obtained. Furthermore, we compare two...

Abstract Chemical sensing on oxide sensors is a complex phenomenon involving catalytic activity as well electronic properties. Thus, the properties of are highly sensitive towards structural changes. Effects like surface area, grain size, and, in addition, occurrence defects give separate contributions to current. Structure–property–function relationships can be elucidated using combination state‐of‐the‐art analytical techniques. It shown, that impurity atoms lattice influence performance...

Surfactants are molecules of enormous scientific and technological importance, which widely used as detergents, emulsifiers, for the preparation diverse nanostructures. Their fascinating ability to form self-organized structures, such micelles or liquid crystals, originate from their amphiphilic architecture-a polar head group linked a hydrophobic chain. While almost all known surfactants organic, new family is now emerging, combines properties with advanced functionality transition-metal...

Increased hydrophobicity of well-defined polyoxometalate clusters is possible through complexation with cationic surfactants in a one-pot reaction. The clusters, toroid and spherical shape colloidal dimensions, then organized into ordered, supramolecular assemblies, as shown schematically, are similar to classical liquid crystals. increased solubility organic media opens the door new polyoxometalate-polymer hybrid materials.

Sol−gel nanocasting is used to imprint the soft-matter structures of lyotropic phases nonionic n-alkyl−poly(ethylene oxide) amphiphiles ("CxEy") into solid porous silica. Small angle X-ray scattering (SAXS), nitrogen sorption, and transmission electron microscopy (TEM) are investigate dependence porosity on block lengths or volumes, respectively. It found that size mesopores a function lengths/volumes both alkyl chain (NA) PEO (NB). Moreover, materials contain substantial degree additional...

Methanol catalysis meets chemistry under confined conditions. is regarded as one of the most important future energy sources. ZnO/Cu composite materials are very effective in heterogeneous for methanol production due to so-called strong metal-support interaction effect (SMSI). Therefore, superior structural design potentially representing model systems highly desired. Ultimately, such could help understand between copper and zinc oxide more detail than currently possible. We report...

Increased hydrophobicity of well-defined polyoxometalate clusters is possible through complexation with cationic surfactants in a one-pot reaction. The clusters, toroid and spherical shape colloidal dimensions, then organized into ordered, supramolecular assemblies, as shown schematically, are similar to classical liquid crystals. increased solubility organic media opens the door new polyoxometalate-polymer hybrid materials.

A novel exchange between ligands and/or guest molecules can be accomplished in giant molecular spheres (an example is shown the picture) which are equilibrium with corresponding baskets solution.

ZnO is a metal oxide material which possesses versatile properties and applications. Therefore, the target-oriented preparation of has become major issue. Many techniques involve bottom-up methods from precursor solutions. In current contribution, special system described that enables fine-control kinetic parameters for nucleation growth in various organic solvents. A large variety analytical could be applied an situ fashion to probe formation at all times length scales. Among are UV/vis,...

Mesoporous materials are valuable supports for the immobilization of various molecular catalysts. Cases in which performance catalyst improves after have seldom been reported, especially when it comes to enantioselective synthesis. Knowledge how presence support surface alters properties a bound is therefore very important. In current article, new periodically ordered mesoporous organosilica material (PMO) with walls exclusively made chiral building block presented. The attachment AlIII as...

Surfactants are indispensable in established technologies as detergents or emulsification agents, and also recent studies for controlling the growth of nanoparticles creating nanocarriers. Although properties conventional, organic surfactants thoroughly explored, strong interest persists that possess unique features inaccessible ordinary systems. Here we present dipolar, bolaform with a head group comprising 11 tungsten atoms. These novel compounds characterized by an exceptionally low...

We study the existence of Li-related shallow and deep acceptor levels in Li-doped ZnO nanocrystals using electron paramagnetic resonance (EPR) photoluminescence (PL) spectroscopy. with adjustable Li concentrations between 0% 12% have been prepared organometallic precursors show a significant lowering Fermi energy upon doping. The an 800 meV could be identified both EPR PL measurements is responsible for yellow luminescence at 2.2 eV. Additionally, state 150 above valence band maximum made...

Hot under the surface: Surfactants with purely inorganic head groups, comprising a ruthenium-substituted polyoxotungstate cluster, are used to unlock enormous potential of synergistic combination surfactant self-assembly and stimuli-responsive properties. The system can dynamically respond chemical trigger (such as change in micelle shape; see scheme), could lead new applications for surfactants light harvesting. Detailed facts importance specialist readers published "Supporting...