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。
Electrospinning is a versatile technique for preparation of micro- and nanoscale fibers using polymer solutions. The study presented here describes an observation of multiple Taylor cones in electrospinning processes. Plausible physical models explaining the formation and modeling of multiple Taylor cones in terms of…
Abstract Taking advantage of the DSC method, general procedures were presented for qualitative and quantitative evaluation of the phase separation degree and the crystalline phase content in polyurethane elastomers with well‐defined structures. Those elastomers were obtained not only in a typical one‐step method but a…
Thermal conductivity of liquid silicon is indispensable for numerical modeling of silicon crystal growth processes and for elucidating electron transport phenomena in high-temperature liquids. However, crucial obstacles render measurement of thermal conductivity difficult: convection and contamination from contact mat…
Arrays of Ta nanorods were grown by glancing angle deposition (GLAD) onto honeycomb Cr nanodot patterns that were evaporated onto Si substrates through a self-assembled monolayer of SiO2 nanospheres. Statistical size analyses from arrays of rods with variable average length l and width w, with 210nm⩽l⩽650nm and 109nm⩽…
Degradable metal alloys constitute a new class of materials for load-bearing biomedical implants. Owing to their good mechanical properties and biocompatibility, magnesium alloys are promising in degradable prosthetic implants. The objective of this study is to improve the corrosion behavior of surgical AZ91 magnesium…
By using a facile, wet-chemical approach, luminescent LaF3:Ce3+/Tb3+ single-crystal nanoparticles were prepared from nitrate and sodium fluoride precursors in a mixture of ethanol and ethylene glycol. These nanoparticles were functionalized with glucose. A novel fluorescence resonance energy transfer method for nonenz…
Rundgemacht: Das Biegen eines molekularen Drahtes um ein achtzähniges Templat führt zur Entstehung eines hochsymmetrischen, gürtelförmigen π-Systems (grün im Bild), das sich durch Zugabe eines großen Überschusses an Pyridin unter Bildung des entsprechenden cyclischen Octamers freisetzen lässt.
A low threshold and high efficiency laser based on dye-doped cholesteric liquid crystals (CLCs) is demonstrated using an input excitation with the same handedness of circular polarization as the helical structure of the sample at the shorter wavelength band edge of the reflection band. The responsible mechanism origin…
Abstract Calcium carbonate monohydrate (monohydrocalcite) is prepared and structurally characterised by X‐ray diffraction, X‐ray absorption spectroscopy (EXAFS), thermal analysis, IR spectroscopy, and scanning electron microscopy. It is compared to hydrated phases of amorphous calcium carbonate (ACC) that have frequen…
Successful tissue engineering of vascular grafts largely depends on synthetic scaffolds that support the survival, proliferation, and differentiation of seeded cells. To investigate the utility of polyurethanes for vascular tissue engineering, three-dimensional porous polyurethane scaffolds with highly interconnected…
Surface-enhanced Raman spectroscopy (SERS) was performed on Ga2O3∕Ag and ZnO∕Ag nanowires, which were arranged in either a crossover or noncrossing geometry. Results indicate a high SERS sensitivity (near 0.2pg) for nanowires arranged in a crossing geometry. It is suggested that this is due to the dielectric core/meta…
We study the kinetic pathways for the isotropic-to-nematic transition in a fluid of colloidal hard rods. In order to follow the formation of the nematic phase, we develop a new cluster criterion that distinguishes nematic clusters from the isotropic phase. Applying this criterion in Monte Carlo simulations, we find sp…
The n-alkanes C(16)H(34), C(17)H(36), C(19)H(40), and C(25)H(52) have been imbibed and solidified in mesoporous, crystalline silicon with a mean pore diameter of 10 nm. The structures and phase sequences have been determined by x-ray diffractometry. Apart from a reduction and the hysteresis of the melting-freezing tra…
Abstract One of the suitable methods for removing heavy metals from waste water is using surface adsorption process. In this article, the preparation of polyaniline and its composites as adsorbents are discussed and the capability of separating chromium from industrial waste water is studied. The results were compared…
Multilayered Ba1−xSrxTiO3 (BST) films were deposited on Pt coated Si substrates via metalorganic solution deposition. The multilayer heterostructures consisted of three distinct layers of ∼220nm nominal thickness with compositions corresponding to BST 63∕37, BST 78∕22, and BST 88∕12. At room temperature, the heterostr…
In the last twenty five years structure determination from powder diffraction has evolved from a complex, time-consuming method to one easily usable. While the use of direct methods is restricted to samples well crystallized (sharp peaks, high resolution diffraction), structure solution using global optimization in di…
Difunktionelle Nanokomposite aus halbleitenden und magnetischen Nanopartikeln interessieren in biologischen Anwendungen zum Markieren, zur Bildgebung und zum Trennen von Zellen. Deshalb wurde ein Nanokompositsystem aus magnetischen Fe2O3-Nanopartikeln und CdSe-Quantenpunkten, das Superparamagnetismus mit einstellbaren…
Abstract A silver/nylon 6,6 nanocomposite containing 1 wt % metallic silver has been produced from an aqueous solution of silver nitrate in the presence of ammonia and ethylene glycol by an ultrasound‐assisted reduction method. The structure and properties of nylon 6,6 coated with silver have been characterized with X…
Crystal structure, spin state, and semiconductor-metal transitions of ${\mathrm{LaCoO}}_{3}$ in the $10--905\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ temperature range were studied by neutron diffraction at high pressures up to $4.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and x-ray diffraction and Raman spectroscopy at h…
Violet-blue photoluminescence was produced at room temperature in a structurally disordered SrZrO3 perovskite structure with a 350.7nm excitation line. The intensity of this emission was higher than that of any other perovskites previously studied. The authors discuss the role of structural order-disorder that favors…