Materials Literature
文献浏览
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。
lmpressum / Masthead
Titelei
Einfluß von Additiven auf die rheologischen Eigenschaften von TiO2 Suspensionen / Influence of Additives on the Rheological Properties of TiO2 Suspensions
Jubiläum in Hamburg / Jubilee in Hamburg
Ticker / Ticker
Standardisierte Texturmessung / Standardized Measuring of Textures
Inhalt / Contents
Patente / Patents
Crystal Structure of a Sodium Sorption Complex of Zeolite X Containing Linear Na32+Clusters
An anhydrous single crystal of sodium zeolite X, Na 92 Si 100 Al 92 O 384, was exposed for 48 h to Na vapor at 225 °C. Its structure was determined by X-ray diffraction methods in the cubic space group Fd 3̄; a = 25.100(11) Å at 22 °C; R 1 = 0.071 and R 2 = 0.088 for the 544 reflections for which I > 3σ( I ). A total…
Conducting Polymer Color Sensor
A color sensor device using conducting polymer poly(3-hexylthiophene) (PAT6), has been fabricated and characterized. The device consists of two photocells made of the same conducting polymer with different polymer thicknesses, and which exploits the difference in the photocurrent spectrum of the photocells. The color…
A Processable Mullite Precursor Prepared by Reacting Silica and Aluminum Hydroxide with Triethanolamine in Ethylene Glycol: Structural Evolution on Pyrolysis
A simple, processable precursor to mullite can be synthesized in quantities of 100 g in a few hours by direct reaction of silica, aluminum hydroxide, and triethanolamine in ethylene glycol. To delineate a processing window whereby precursor shapes can be transformed into mullite, the chemical and phase microstructural…
Crystal Structures of Dehydrated Fully Mn2+-Exchanged Zeolite X and of Its Ethylene Sorption Complex
The crystal structures of dehydrated Mn 46 Si 100 Al 92 O 384 ( a = 24.721(5) Å) and of its ethylene sorption complex Mn 46 Si 100 Al 92 O 384 ·30C 2 H 4 ( a = 24.690(5) Å) have been determined by single-crystal X-ray diffraction techniques in the cubic space group Fd 3̄ at 21(1) °C. Each crystal was prepared by dehyd…
The concept of cohesional entanglement
Abstract A concept of cohesional entanglement through local nematic interaction of neighboring chain segments has been introduced in addition to the usual topological entanglement of chains. As topological entanglement is important to properties of the polymer in the rubbery and flowing states at temperatures well abo…
Experience and assessment of stress corrosion cracking in L-grade stainless steel BWR internals
The stress corrosion cracking (SCC) rate of reactor internals of boiling water reactors (BWR) continues to increase with on-line operating years. The recent occurrences of cracking in the weld heat affected zones of high carbon stainless steel core shrouds correlate with the years of operation and the water chemistry…
Antiulcer activity of naturally occurring pyrano-coumarin and isocoumarins and their effect on prostanoid synthesis using human colonic mucosa.
Oral administration of bergenin and norbergenin, two isocoumarins, isolated from the leaves and roots of Flueggea microcarpa and luvangetin, a pyranocoumarin isolated from the seeds of Aegle marmelos Correa, showed significant protection against pylorus-ligated and aspirin-induced gastric ulcers in rats and cold restr…
Theory of color symmetry for periodic and quasiperiodic crystals
The author presents a theory of color symmetry applicable to the description and classification of periodic as well as quasiperiodic colored crystals. This theory is an extension to multicomponent fields of the Fourier-space approach of Rokhsar, Wright, and Mermin. It is based on the notion of indistinguishability and…
Viscoelastic model of phase separation
We show here a general model of phase separation in isotropic condensed matter, namely, a viscoelastic model. We propose that the bulk mechanical relaxation modulus that has so far been ignored in previous theories plays an important role in viscoelastic phase separation in addition to the shear relaxation modulus. In…
Surface-Enhanced Raman Spectroscopy of Crystal Violet in the Presence of Halide and Halate Ions with Near-Infrared Wavelength Excitation
The interaction of crystal violet (CV) with halide, halate ions, and pyridine and the interaction of CV with colloidal silver surface have been studied by surface-enhanced Raman spectroscopy (SERS) with near-infrared (NIR) excitation. Cl -, Br -, I -, and BrO 3 - ions as well as pyridine give rise to a large enhanceme…
Measurement of crystalline index in nylons by DSC: Complexities and recommendations
Differential scanning calorimetry (DSC) is one of the most widely used technique for measuring crystallinity in the polymer industry. The major source of error in the crystalline index (CIDSC) of low crystallinity polymeric articles, is the development of further crystallinity during the DSC scan. Although, this type…