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。
In clinical diagnosis, gadolinium (Gd) ion/low molecular weight chelater complexes have been used as MRI contrast agents that disperse throughout a particular tissue and cause a brighter appearance in MRI. In order to provide a novel imaging concept for MRI, a contrast agent in which the T(1)-relaxation shortening act…
Protonic conduction in oxide ceramics under hydrogen-containing atmosphere at elevated temperatures is reviewed with respect to oxide materials, their electrochemical properties, conduction mechanism and possible applications. These oxides are unique in respect of the fact that they have no protons as a host component…
Vascular smooth muscle cells derived from the rat aorta were cultured on unmodified or F(+) ion-implanted polystyrene (5 x 10(12) or 5 x 10(14) ions/cm(2), energy 150 keV). In 1-day-old cultures, the cells adhered to the modified polystyrene in higher numbers and over larger contact areas. Increased resistance of the…
Selected theoretical developments in modeling of deposition of submicrometer size (submicron) particles on solid surfaces, with and without surface diffusion, of interest in colloid, polymer, and certain biological systems, are surveyed. We review deposition processes involving extended objects, with jamming and its i…
Many research and commercial applications use a synthetic substrate which is seeded with cells in a serum-containing medium. The surface properties of the material influence the composition of the adsorbed protein layer, which subsequently regulates a variety of cell behaviors such as attachment, spreading, proliferat…
X-ray diffraction (XRD) and magnetization measurements were employed to investigate the effect of Mn substitution for Co on the structure and magnetic properties of Ce 2 Co 17- x Mn x compounds with x = 0, 1, 2, 3, 4. XRD patterns show that all samples are single phase with the hexagonal Th 2 Ni 17 -type structure. Th…
The kinetics and mechanism of the bulk free-radical polymerization of vinyl neodecanoate in the presence of polybutadiene are studied in a series of rate and molecular weight distribution measurements over the temperature range 50−90 °C. The polymerization of the vinyl ester is greatly retarded by the presence of poly…
The polymorph and crystallization process for syndiotactic polypropylene (sPP) formed around at 0 °C after quenching from the melt has been dynamically investigated by infrared spectroscopy. The observation is carried out at constant temperatures between −5 and 15 °C after quenching into ice−water from the melt. Just…
Reactions of alkaline earth metal chlorides with 2-aminobenzoic acid (2-abaH) have been investigated. The treatment of MCl2.nH2O (M = Mg, Ca, Sr or Ba) with 2-abaH in a 1:2 ratio in a MeOH/H2O/NH3 mixture leads to the formation of anthranilate complexes [Mg(2-aba)2] (1), [Ca(2-aba)2(OH2)3]infinity (2), [[Sr(2-aba)2(OH…
The complex perovskite lead iron niobate, Pb(Fe 1/2 Nb 1/2 )O 3 (PFN), has been studied by neutron powder diffraction. Following collection of diffraction data at 300 K and at 10 K, structural refinements have been carried out by means of the Rietveld method. As expected, a straightforward unit cell of symmetry R 3 m…
Ultrathin polymer capsules prepared by stepwise deposition of oppositely charged polyelectrolytes onto melamine formaldehyde latex particles and biological cells with subsequent dissolution of the core have been examined by scanning force microscopy (SFM) in the dried state. Folds generated during the drying-induced c…
Perovskites of the R 1- x Ba x CoO 3- y type where R is Nd or Gd have been prepared and characterized. The substitution of Nd by Ba ions up to x = 0.4 leads to a nonhomogeneous ferromagnetic state appearance similar to that found for the La 1- x Sr x CoO 3 system studied earlier. Structural refinement of Nd 0.5 Ba 0.5…
Dendrimere gehören zu den derzeit am intensivsten bearbeiteten Verbindungsklassen. Dies hängt mit ihrer außergewöhnlichen Struktur zusammen, die man als einen Urwald aus ineinander verschlungenem Astwerk beschreiben kann, in dem es gewundene Pfade zu süßen Früchten und leuchtenden Blüten gibt, auf denen man aber auch…
Ausgerichtete Zeolithmonoschichten wurden mit hoher Oberflächenbedeckung und perfekt eindimensionaler Orientierung (immer die gleiche Kristallfläche; siehe Bild) kovalent an Glas und Muskovit gebunden. Die Bindungen wurden zwischen unabhängig aufgebrachten oberflächengebundenen funktionellen Gruppen (Epoxid und Amin)…
Theoretical models taking into account different feedback source terms (e.g., ion-impact electron emission, photo-electron emission, field emission, etc) have been proposed for the existence and explanation of the shape of negative corona current pulse, including the step on the leading edge. In the present work, a ne…
Results are presented from studies of the relationship between the friction coefficient and environment, load and sliding velocity for a natural diamond stylus performing reciprocating sliding over a CVD diamond sample. The properties of CVD diamond are not necessarily similar to those of natural diamond. It is thus i…
The synthesis and structural characterisation of a series of cobalt and nickel cages are reported. Eight of these structures contain a [M10(mu3-OH)6(eta2, mu3-xhp),(eta2, mu2-O2CR)6]2+ core (where M = Co or Ni; xhp = 6-chloro- or 6-methyl-2-pyridonate: R = Me, Ph, CHMe2, CH2Cl, CHPh2 or CMe3), where the ten metal atom…
Direct on-column surface-enhanced Raman spectroscopy (SERS) detection is demonstrated in capillary electrophoresis (CE). Distinctive SERS spectra of two test compounds, riboflavin and Rhodamine 6G, are obtained in 100 microm i.d. fused-silica capillaries under CE conditions using running buffers that contain silver co…
Chiral columnar liquid crystals have recently appeared as a promising new type of ferroelectric materials. To date, all the columnar liquid crystals that have been reported to show ferroelectric switching consist of organic compounds. However, metal-containing liquid crystals open this field to a significant number of…
The high symmetry parent phase and the two derived low symmetry phases of the complex perovskite PbFe 0.5 Ta 0.5 O 3 have been refined by the Rietveld method from neutron powder diffraction data. The analysed powders were obtained by grinding single crystals. Owing to the very small distortions from the cubic structur…