Materials Literature
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Polyelectrolyte layer-by-layer (LbL) nanofilms are interesting polymeric structures, built by alternating adsorption of positively and negatively charged polyelectrolytes. They consist of multilayer sheets with nanometric overall thickness, and they can be used as supports and surface coatings for in vitro and in vivo…
Monodisperse high-molecular weight macrothiols were synthesized and efficiently coupled to various allylic precursors via thiol–ene click chemistry. A comprehensive dendritic library was obtained in good yields and short reaction times including conventional dendrimers as well as more sophisticated structures such as…
Abstract A method for the growth of films consisting of Nanoparticles (NP) of Ag and Au is presented. Nanostructured films were obtained by means of nanosecond pulsed laser ablation of a metallic target in presence of a controlled Ar atmosphere. The morphology of these films from island structures to isolated nanopart…
A new series of degradable and water-swellable cross-linked PEG phosphoester polymers (CPPs) based on a facile cross-linked reaction between diphosphoesters of polyethylene glycol (P-PEG-P) and diglycidyl ether of polyethylene glycol (E-PEG-E) has been prepared and characterized. The molecular weights and ratios of th…
Abstract Metal clusters stabilized by a surface ligand shell represent an interesting intermediate state of matter between molecular metal–ligand complexes and bulk metal. Such “metalloid” clusters are characterized by the balance between metal–metal bonds in the core and metal–ligand bonds at the exterior of the clus…
Abstract Unstabilized poly(ether block amide) (PEBA, PEBAX) of the type used in angioplasty balloons was aged at temperatures of 18–85°C for periods of up to 313 days. Since PEBA is used in safety critical applications, understanding the effects and underlying mechanisms of ageing and the validity of accelerated agein…
Abstract A new Gd 26 cluster based 3D framework, {[Gd 26 (μ 6 ‐CO 3 ) 9 (NIC) 32 (μ 3 ‐OH) 26 ](NO 3 ) 2 · 3(H 2 O)} n ( 1 ) (NIC = nicotinato anion) has been prepared through hydrothermal synthesis and characterised by single‐crystal X‐ray diffraction. The Gd 26 clusters are formed by the combination of five distorte…
Polyrotaxanes consisting of α-cyclodextrin and poly(ethylene glycol) are versatile building blocks for the construction and controlled degradation of multilayers. Degradation is based on “unlocking” the α-cyclodextrins by disulfide cleavage of the polyrotaxane capping groups. This disrupts the multivalent intermolecul…
Achiral pyrene oligomers α show remarkable amplification of chirality (see circular dichroism spectra) in the presence of minute quantities of a chiral inductor χ. Spectroscopy and electron microscopy data support a model in which pyrene oligomers form helical, supramolecular polymers by interstrand stacking interacti…
This work reports an unexpected oxidation behavior of Cu nanoparticles embedded in porous Al(2)O(3) confinements that are produced by annealing alucone (an organic-inorganic hybrid material) deposited by molecular layer deposition. An oxidation of such encapsulated Cu nanoparticles by annealing in air produces Cu oxid…
The longitudinal piezoelectric coefficient ${d}_{33}^{*}$ of a PZT-like ferroelectric is computed in the full composition-temperature parameter space using sets of parameters that control the position of the tricritical points and the degree of tilting of the morphotropic phase boundary separating the ferroelectric rh…
The boric acid flux reactions of uranyl nitrate with sodium, potassium, rubidium, or thallium fluoride result in the formation of a novel family of uranyl(VI) fluoroborate materials. These compounds are Na[(UO 2 )B 5 O 8 (OH)F]·H 2 O ( NaUBOF-1 ), K[(UO 2 )B 5 O 8 (OH)F] ( KUBOF-1 ), K 11 [(UO 2 ) 6 B 24 O 36 F 22 )](…
A library of cationic polymers, poly(beta-amino alcohols) with a great chemical diversity are synthesized using combinatorial polymerization. These polymers, when immobilized on a surface, drastically affect the behavior of monocyte/macrophage cells in vitro and early inflammatory reactions in vivo. Certain polymers a…
We have investigated the glass transitions of trihydric alcohols using broadband dielectric spectroscopy, and compare the results with those previously reported for sugar alcohols. Although a systematic glass transition feature related to molecular size has been reported for sugar alcohols, the essential factor govern…
Facile synthesis of biocompatible materials from α- or β-cyclodextrin and their polymers can be achieved via a kinetically controlled acetalation. These materials can hydrolyze into the corresponding precursors, with a fast or slow process dependent on pH. Since cyclodextrins can function as the building units to synt…
We report here a novel synthetic route for the preparation of well-defined and faceted nanocrystals of ternary rare earth oxychlorides based on the ligand exchange and condensation of rare earth halides and alkoxides in the presence of coordinating solvents. Nanocubes, faceted 2D nanosheets, and nanodisk morphologies…
Most dental materials are designed to have a relatively 'neutral' existence in the mouth. It is considered that if they are 'passive' and do not react with the oral environment they will be more stable and have a greater durability. At the same time, it is hoped that our materials will be well accepted and will cause…
Zinc oxide (ZnO) with its deep level defect emission covering the whole visible spectrum holds promise for the development of intrinsic white lighting sources with no need of using phosphors for light conversion. ZnO nanorods (NRs) grown on flexible plastic as substrate using a low temperature approach (down to 50 °C)…
Suppression of tritium permeation through structural materials is essential in order to mitigate fuel loss and radioactivity concerns. Ceramic coatings have been investigated for over three decades as tritium permeation barriers (TPBs); however, a very limited number of investigations on the mechanism of hydrogen-isot…
A new generally applicable method to calculate the relative energetic stability of localized and delocalized charges in a system of two molecules is presented. The relative stability of localized and delocalized charges was calculated for π-stacked triphenylenes at varying twist angles and intermolecular distances. Th…