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 band gap of a semiconducting single wall carbon nanotube decreases and eventually vanishes leading to metalization as a result of increasing radial deformation. This sets in a band offset between the undeformed and deformed regions of a single nanotube. Based on the superlattice calculations, we show that these fe…
Non-equilibrium dynamics in a Ag(Mn) spin glass are investigated by measurements of the temperature dependence of the remanent magnetisation. Using specific cooling protocols before recording the thermo- or isothermal remanent magnetisations on re-heating, it is found that the measured curves effectively disclose non-…
The one-dimensional propagation of a multiporphyrin array up to a few hundred nanometers length has been achieved through the accumulated complementary coordination of bis(N-methylimidazolylporphyrinatozinc) (see picture). The array has close interelement distances, and a reversible adjustment of the length equilibriu…
We review the Cini-Sawatzky approach to the line shape analysis of Auger CVV transitions, in its basic and original formulation. Then, several extensions of the theory are reviewed, namely the inclusion spin-orbit coupling, dynamical/plasmon screening, overlap effects, off-site interactions, the treatment of disorder…
Plasticizer effect on oxygen permeability (OP) of beta-lactoglobulin (beta-Lg) films was studied. Propylene glycol (PG), glycerol (Gly), sorbitol (Sor), sucrose (Suc), and polyethylene glycol at MW 200 and 400 (PEG 200 and PEG 400, respectively) were studied due to their differences in composition, shape, and size. Su…
The layer-by-layer growth pattern of the ligated capped 3-shell Pd145 core of the nanosized cluster Pd145(CO)x(PEt3)30 presumably involves an energetic compromise between the maximization of atom connectivities (resulting in the lowest surface Pd coordination number being seven) and the minimization of icosahedral str…
If porphyrins can do it corroles can do it better! The relatively stable (oxo)manganese(V) corrole 2 can be characterized by spectroscopic methods following its ready formation from [Mn(tpfc)] (1, H3(tpfc)=5,10,15-tris(pentafluorophenyl)corrole). Complex 1 is a mild catalyst for the epoxidation of styrene by iodosylbe…
Eine bioorganisch-anorganische Hybridverbindung wird aus anionischen Biomolekülen gebildet (z. B. DNA-Fragmenten, ATP oder Antisense-Oligonucleotiden), die in einem kationischen Mg/Al-Doppelhydroxid intercaliert sind (siehe Bild). Mit einem derartigen Hybridsystem können Wirkstoffe oder auch Gene transportiert und aus…
General principles and perspectives Specimen preparation Tension Compression Shear Flexure Through-thickness testing Interlaminar fracture toughness Impact and damage tolerance Fatigue Environmental testing of organic matrix composites Scaling effects in laminated composites Statistical modelling and testing of data v…
The fracture surfaces of specimens of a heat‐treated hard steel, namely Cr–Mo steel SCM435, which failed in the regime of N = 10 5 to 5 × 10 8 cycles, were investigated by optical microscopy and scanning electron microscopy (SEM). Specimens having a longer fatigue life had a particular morphology beside the inclusion…
Single-site achiral and chiral C 3 -symmetric complexes LMOR, where M = Mg and Zn, L = an η 3 -trispyrazolyl- or η 3 -trisindazolyl-borate ligand and R = Et, t Bu, Ph, or SiMe 3, have been synthesized and employed in the ring-opening polymerization of l -, rac -, and meso -lactide in CH 2 Cl 2 at 25 °C and below. The…
In-situ synchrotron small-angle X-ray scattering (SAXS) was used to follow orientation-induced crystallization of isotactic polypropylene (i-PP) in the subcooled melt at 140 °C after step shear under isothermal conditions. The melt was subjected to a shear strain of 1428% at three different shear rates (10, 57, and 10…
A biomolecular–inorganic hybrid is formed from anionic biomolecules (such as DNA fragments, ATP, or an antisense oligonucleotide) intercalated in a cationic Mg/Al layered double hydroxide (see picture). Such a hybrid can be used to deliver drugs or genes from the inorganic noncytotoxic carrier. Cellular uptake experim…
A simple method was used to assemble single-walled carbon nanotubes into indefinitely long ribbons and fibers. The processing consists of dispersing the nanotubes in surfactant solutions, recondensing the nanotubes in the flow of a polymer solution to form a nanotube mesh, and then collating this mesh to a nanotube fi…
The central problem in the determination of protein structures form x-ray diffraction dada (x-ray crystallography) corresponds to a phase retrieval problem with undersampled amplitude data. Algorithms for this problem that have an increased radius of convergence have the potential for reducing the amount of experiment…
The electronic structure and linear optical properties of the pyroborate A2B2O5 (A = Mg, Ca, Sr) compounds are reported here. These compounds, which crystallize with four formula units in the monoclinic space group P21/c, are modeled in terms of the cluster units (A2B2O5)2. The calculated electronic structures show th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPhotochemical Control of the Macroconformation of Polystyrene Using Azobenzene Side ChainsGilles Clavier, Faysal Ilhan, and Vincent M. RotelloView Author Information Department of Chemistry, University of Massachusetts, Amherst, Mas…
Directed synthesis of metal catalyzed carbon nanofibers and graphite encapsulated metal nanoparticles is demonstrated where the catalyst metal nanoparticles of Ni have been preformed prior to introduction into a reactive hydrocarbon growth environment. Control of the chemical environment by additives governs the type…
Fibril reconstruction process, that is, the nucleation and growth of mixed type I collagen fibril of shark and pig, progressed faster than that of the individual collagen species of shark or pig. The reconstructed mixed collagen fibril had a greater resistance to return to the solution or to melt into gelatin in compa…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSingle-Bubble SonophotoluminescenceMuthupandian Ashokkumar and Franz GrieserView Author Information Particulate Fluids Processing Centre School of Chemistry, University of Melbourne Parkville, VIC, 3010, Australia. Cite this: J. Am. Chem. Soc. 2000, 122, 48, 12001–1200…