Materials Literature
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Dendritic cell-wall mimics: Choline-binding proteins from Streptococcus pneumoniae recognize distinctive multivalent choline architectures on the bacterial cell wall. Choline-functionalized dendrimers are potent inhibitors of these essential enzymes, with a 103–104-fold higher affinity than free choline, resulting in…
Abstract The periphery is central : The luminescent properties of boron(III) subporphyrazines are strongly influenced by their peripheral functionalization. These photoactive materials generate long‐lived triplet excited states that mediate the sensitized production of singlet oxygen. Furthermore, their ability to beh…
Abstract The crystallization of helical nanostructure resulting from the self‐assembly of a chiral diblock copolymer, poly(styrene)‐ b ‐poly( L ‐lactide) (PS‐PLLA), is studied. Various crystalline PS‐PLLA nanostructures are obtained by controlling the crystallization temperature of PLLA ( T c,PLLA ), at which crystall…
Abstract Storage facility : A dihydrogen complex formed in transition‐metal‐doped NaAlH 4 was found to play important roles in hydrogen release/uptake (see figure). Electronic structure analysis revealed that the electron transfer between hydrogen and Al groups was mediated by the d orbitals of transition metals. Hydr…
Through a combination of aberration-corrected HAADF-STEM and the EELS at the atomic level, it is found that added La in CaCu3Ti4O12 is selectively substituted for Ca, rather than Cu. The present study suggests that imaging based on STEM combined with EELS can be utilized as a powerful tool that reveals the atomic-leve…
Evidence for interactions between π-electron-rich calixarene cavities and the surface of gold nanoparticles is demonstrated using a comparative synthetic approach involving the capping of the nanoparticles with thiol ligands. In one approach, thiol ligands are systematically titrated onto existing 5.3 nm gold nanopart…
Anodic aluminum oxide membranes with serrated nanochannels have been successfully fabricated via a two-step annodization method. The serrated channels with periodic intervals are aligned at an angle of ∼25° along the stem channels. The formation of the serrated channels is attributed to the generation of oxygen gas bu…
We present results of detailed atomistic modeling of the early stages of the synthesis of periodic mesoporous silica using molecular dynamics. Our simulations lead to the proposal of a mechanism that validates several previous experimental and modeling studies and answers many controversial issues regarding the synthe…
The mechanical behaviour of clusters of interacting 50 nm Si nanoparticles has been characterized in real-time using a custom made in situ transmission electron microscope nanoindentation holder with axial stiffness 1800 N m −1 . The clusters of Si nanoparticles are mechanically loaded through a displacement controlle…
Micropatterns of silica were generated under biocompatible conditions by a combination of microcontact printing (muCP), layer-by-layer (LbL) self-assembly, and biomimetic silicification. Quaternary amine-containing poly(diallyl dimethyl ammonium chloride) induced polycondensation of silicic acid, resulting in spatiose…
Abstract Zwei Sätze von difunktionellen AB 2 C‐Dendrimeren mit internen Acetylen/Azid‐ und externen Hydroxygruppen wurden synthetisiert. Eine erfolgreiche Funktionalisierung in situ belegte das chemoselektive Verhalten der Dendrimere, die außerdem in dendritische Nanopartikel umgewandelt oder als dendritische Vernetze…
Para-methyl benzyl alcohol (p-MeBA II) and para-chloro benzyl alcohol (p-ClBA) are quasi-isostructural and share the same hydrogen-bond patterns, but their crystals are not isomorphous. No new polymorphs could be obtained by conventional polymorph screening based on different solvents and different crystallization con…
New tricks for an old dog: Calixpyrroles bind anions efficiently and can be transformed into transition-metal complexes only under forcing conditions. Reducing the macrocycle creates a ligand that easily forms classical Werner complexes with copper, nickel, and palladium ions. The metal complexes present an array of f…
The peculiar properties of osmotically shrunken liposomes acting as magnetic resonance imaging-chemical exchange saturation transfer (MRI-CEST) contrast agents have been investigated. Attention has been primarily devoted to assessing the contribution arising from encapsulated and incorporated paramagnetic lanthanide(I…
Three different polymorphic crystalline structures, including microbelts and flowerlike supernanostructures, were obtained via a simple solution process by utilizing different solvents from an oligoarene derivative. Explosive chemosensors based on these self-assembled organic crystalline nanostructures were successful…
Because mass‐produced carbon nanotubes (CNTs) are strongly aggregated and highly hydrophobic, processes to make them water soluble are required for biological applications. Suspensions in surfactant solutions are often employed. Among these, Pluronic F127 appear to be highly biocompatible if used at low concentrations…
We report here a detailed single-crystal EPR and magnetic study of a homologous series of complexes of the type Ln-M (Ln = La(III), Ce(III); M = Fe(III), Co(III)). We were able to obtain a detailed picture of the low-lying levels of Ce(III) and Fe(III) centres through the combined use of single-crystal EPR and magneti…
Abstract CT or not CT : Three imidazole‐annulated TTF derivatives 1 – 3 have been prepared and fully characterized. The influence of the TTF unit on the p K a values of the acceptor units as determined by photometric titration has been discussed. The results reported here are part of an initial exploratory study to ge…
Weld deposits are one of the most used economical ways of the wear resistance increase. The study compares the characteristics of the overlay material welded-on and the abrasive wear resistance. The research has been carried out using hardfacing alloys reinforced with primary chromium carbides and complex carbides. Th…
Multi‐walled carbon nanotubes (MWCNTs) were studied as reinforcing filler in a natural rubber based formulation as partial replacement of carbon black. Four levels of MWCNTs were tested at 2.5, 5, 10 and 15 phr in a compound already containing 50 phr of N375 carbon black. The data obtained were compared with the resul…