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。
Visco-elastic properties of 5CB as a function of temperature in the nematic region are studied. Three Miesowicz viscosity coefficients ηa ηb and ηc and rotational viscosity γ1 are determined by dynamic light scattering (DLS) measurements. By assuming α3 ≅ 0, other Leslie viscosity coefficients are also calculated. Fit…
An instrument has been designed for the routine analysis of the optically stimulated luminescence signal from single grains of sand. The system is capable of analysing over 3000 individual grains in a single measurement sequence, and the OSL signal from each grain can be read in less than 3 s. The design principles ar…
The isoelectric point of the oxide‐covered aluminum surface is an important parameter in the pitting behavior of aluminum and of aluminum binary surface alloys. Contact angle measurements show that ion implantation of Ta into Al modifies the isoelectric point of the resulting oxide film to a value which is intermediat…
This chapter contains sections titled: Introduction Thermodynamics Morphology Kinetics Conclusions
Carbon nitride films were grown on Si(100) substrates using d.c. magnetron sputtering with r.f. bias. Reactive deposition was achieved using a graphite target in an argon/nitrogen plasma. These films were characterized by transmission electron microscopy (TEM), XPS and Fourier transform infrared spectroscopy (FTIR) sp…
We discuss the phenomenology related to the pressure behavior of viscosity in low-molecular-weight glass-forming liquids. We show that the effect of pressure on viscosity in two examined glass-forming systems, salol and ortho-terphenyl, can be satisfactorily described, over considerable ranges of pressure (up to 1 GPa…
This chapter contains sections titled: Introduction Experimental Procedure Results Discussion
Inorganic fullerene-like nested nanostructures (IFs) such as the WS2 IFs shown in the Figure deposited on an a-SiOx-coated TEM grid are confirmed to confer tribological advantages when added to a lubricant fluid (tetradecane) between two shearing mica surfaces. It is shown that the lower friction is associated with fr…
The freezing behavior of CCl 4 confined in graphitic micropores of activated carbon fibers (ACFs) was examined by use of differential scanning calorimetry over the temperature range of 180 to 320 K. For ACF of average pore width, w = 1.1 nm, we observed a clear peak showing that the freezing temperature is 299 K. The…
Abstract A diarylethene having 2-cyanopyrrole rings turned blue upon UV irradiation in ethyl acetate. The colored form was unstable and returned to the colorless open-ring form with a half-life time of 37 s at room temperature. The activation energy of the thermal fading was obtained to be 32.5 kJ / mol, which is less…
The paper presents a topological classification of the first-coordination-shell shapes for atoms in solids. The classification includes the coordination shells with up to 13 atoms in a shell. Application of the scheme to the classification of disclination junction configurations and interstitial hole shapes is discuss…
ICRF boronization - A new technique towards high efficiency wall coating for superconducting tokamak reactors, Jiangang Li, Yan Ping Zhao, Xue Mao Gu, Chen Fu Li, Bao Nian Wan, Xiao Dong Zhang, Jia Rong Luo, Xian Zhu Gong, Ji Kang Xie, Yuan Xi Wan, Ping Jian Qin, Xiao Ming Wang, Yue Dong Meng, Shen Fa Li, Xiang Gao, Y…
New poly(m-phenylene 4,4′-oxydiphthalimide)s containing various side chains, such as 6-(4-biphenylmethoxy)hexyloxy group and 6-(phenylphenoxy)hexyloxy isomers, were synthesized, giving thin films of a high quality. All the polyimides apparently were almost amorphous, but exhibited short-range ordering in some extent,…
ABSTRACT The inclusion of fibre reinforcement in concrete, mortar and cement paste can enhance many of the engineering properties of the basic materials, such as fracture toughness, flexural strength and resistance to fatigue, impact, thermal shock and spalling. In recent years, a great deal of interest has been creat…
To meet the need for reworkable epoxy resins, a series of cycloaliphatic diepoxides containing thermally cleavable carbamate linkages were synthesized and characterized. These materials were shown to undergo curing reactions with cyclic anhydride in a similar fashion as a commercial cycloaliphatic epoxide, except that…
Mineralogi
Raman spectra and lattice dynamics calculations are presented for the dioctahedral mica, muscovite. Calculated fundamental mode frequencies for the Raman-active and A g and B g species were fit to observed fundamentals assigned to features in the two polarized Raman spectra collected, so that unambiguous vibrational a…
The crack theory in conventional linear elasticity fracture mechanics is extended to quasicrystal linear elasticity fracture mechanics. A decagonal quasicrystal containing a Griffith crack penetrating through the solid along the period direction is considered. By means of a general solution, the analytical expressions…
Raman characterization of germanium (Ge) nanocrystals embedded in amorphous silicon oxide (a-SiO2) films synthesized by rapid thermal annealing (RTA) has been carried out. The samples were prepared by cosputtering Ge and SiO2 targets using a rf magnetron sputtering machine. Ge nanocrystals can only be obtained from sa…
The water activities of aqueous MgCl 2, Mg(NO3)2, and MgSO solutions and their mixtures - MgCl 2-Mg(NO3)2 (mole ratio 3:1, 1:1, 1:3), MgCl 2-MgSO4 (1:1), Mg(NO3)2-MgSO4 (1:1), and MgCl 2-Mg(NO3)2-MgSO4 (1:1:1 and 1:1:5) - were measured at room temperature from dilute solution to high supersaturation using an electrody…