Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The synthesis of octaazaphthalocyanine (AzaPc) derivatives, with bulky phenoxyl substituents placed at eight peripheral positions and containing either H(+), Ni(2+) or Zn(2+) ions in their central cavity, is described. The required precursors, derivatives of pyrazine-2,3-dicarbonitrile, were prepared using a nucleophi…
Solvothermal reaction between thiourea and an ionic cluster compound (denoted CMM-5) containing a cubic cadmium thiolate cluster ([Cd8(SPhF-3)14(DMF)6]2+) at 85 °C in a mixed acetone/H2O solvent converts the discrete cubic cluster into the covalently linked tetrahedral cluster that serves as tetrahedral node in a heli…
The synthesis and hyperpolarizabilities of a series of push−pull chromophores containing a bis-(4-methoxyphenyl) amine donor and efficient acceptor bridges with thiophene and ring-locked polyene are presented. The chromophores are readily soluble in common organic solvents and exhibit high thermal decomposition temper…
Abstract The effect of both sulfur and peroxide curing on the intercalation and exfoliation process of layered silicate was studied to find a suitable vulcanization package for acrylonitrile butadiene rubber. X‐ray diffraction and transmission electron microscopy studies showed that proper selection of a curing packag…
Dramatic reductions of the linewidths of well-known deep centers in $^{28}\mathrm{Si}$ reveal ``isotopic fingerprints'' of the constituents. The $\ensuremath{\sim}1014\text{ }\text{ }\mathrm{meV}$ Cu center, thought to be either a Cu pair or an isolated Cu, is shown to contain four Cu atoms, and the $\ensuremath{\sim}…
The application of viologen dications in the creation of highly sensitive and selective hot spots between silver nanoparticles is reported in the present work. A method to follow the existence of such hot spots in macroscopic samples is proposed based on the plasmon absorption of these nanoparticles in suspension. The…
Abstract Corpses of naturally died honeybees were used as a raw material for chitin isolation. Process of deproteinization of the powder made from clean bee corpses was carried out in the presence of 1 M NaOH at 80°C. Influence of time of alkaline treatment on the yield and molar mass of chitin was studied and optimal…
Surface fouling, i.e. the non-specific surface adhesion of proteins, bacteria and higher organisms, poses a severe problem in many areas ranging from modern diagnostic and therapeutic medical devices to food processing and food wrapping technology to corrosion prevention and marine technology. One approach to address…
Recently published data on polyelectrolyte complexes formed by both oppositely charged synthetic polyions and natural polyelectrolytes (proteins, enzymes, nucleic acids) are summarised. The properties of these complexes and the phase behaviour of their solutions is shown to obey the general trends found in the studies…
Abstract BACKGROUND: Biodegradable block copolymers have attracted particular attention in both fundamental and applied research because of their unique chain architecture, biodegradability and biocompatibility. Hence, biodegradable poly[(( R )‐3 ‐hydroxybutyrate)‐ block ‐( D , L ‐lactide)‐ block ‐(ε‐caprolactone)] (P…
Bis- and monoureas hybridized with the oligo(p-phenylene vinylene) (OPV) pi-electronic segment and 3,4,5-tridodecyloxyphenyl wedge were synthesized and their supramolecular polymerization in diluted solution, gel formation in concentrated solution, and liquid crystallinity in bulk state were investigated. Bisurea 1a f…
We evaluate Ferguson analysis as a method for simultaneously measuring the size and zeta-potential of gold nanoparticle-DNA (Au NP-DNA) conjugates. This approach is highly suitable when the particle size is <20 nm and biomolecular conformation results in a nonspherical or nonlinear conjugate, causing conventional dyna…
The fast degradation rates in the physiological environment constitute the main limitation for the applications of surgical magnesium alloys as biodegradable hard-tissue implants. In this work, a stable and dense hydrogenated amorphous silicon coating (a-Si:H) with desirable bioactivity is deposited on AZ91 magnesium…
Abstract Rigid polyurethane foams (RPUF) filled with various loadings of expandable graphite (EG) or/and hollow glass microspheres (HGM) were prepared by cast molding. The flame retardant properties of these composites were investigated by limiting oxygen index (LOI), horizontal and vertical burning tests. The composi…
Copper telluride (CuTe) is a transition metal chalcogenide with interesting electronic and photoelectric properties and potential applications. In this study, CuTe nanoribbons were successfully synthesized for the first time by an electrochemical method from an aqueous solution at 85 °C without using any template or c…
A series of Mn-doped alkaline niobate-based and lead zirconic titanate ferroelectrics that possess tetragonal, orthorhombic, and rhombohedral perovskite structures was fabricated, and the aging behavior of their hysteresis loop and electrostrain was studied. We found that after aging, all the samples showed a similar…
The crystal structure of the ternary imide Li 2Ca(NH) 2 has been determined using neutron powder diffraction data on a deuterated sample. The structure consists of infinite layers of edge-shared Ca[NH] 6 octahedra, which are separated by Li cations. The mobile Li (+) ions in such two-dimensional channels defined by Ca…
Abstract Biodegradable polyesters such as poly(butylene succinate) (PBS), poly(propylene succinate) (PPS), and poly(butylene succinate‐ co ‐propylene succinate)s (PBSPSs) were synthesized respectively, from 1,4‐succinic acid with 1,4‐butanediol and 1,3‐propanediol through a two‐step process of esterification and polyc…
We present here comparative measurements by scanning electron microscopy (SEM) and field emission (FE) of the mechanical resonances of singly clamped, batch-fabricated SiC nanowires as well as an extensive theoretical description. The mechanical resonances of six nanowires, which were glued to the ends of tungsten sup…
Single silver nanocubes have been studied by transient absorption spectroscopy. The traces show clear modulations due to coherently excited vibrational modes. The average period measured in the experiments was 18.6 ± 1.7 ps, which is in excellent agreement with the calculated period for the breathing mode of the cubes…