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 six new compounds Tl 2 CdGeTe 4, Tl 2 CdSnTe 4, Tl 2 HgGeTe 4, Tl 2 HgSnTe 4, Tl 2 MnGeTe 4, and Tl 2 MnSnTe 4 have been synthesized. All six compounds are isostructural and crystallize in the tetragonal space group I -42 m with a ≈ 8.3 Å and c ≈ 7.1 Å. The structure is composed of chains of composition [AXTe 4 ]…
An approach to isolating small aggregates of single-wall carbon nanohorns (SWNHs) is presented. SWNHs are ultrasonically treated in an aqueous solution of surfactant, resulting in dispersion of SWNH aggregates. Subsequent centrifuging enables the separation of small aggregates from larger aggregates or agglomerations…
In this work, we use the Monte Carlo method to calculate the magnetocaloric effect in the compounds ${\mathrm{Gd}}_{5}{({\mathrm{Si}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x})}_{4}$ for $x>0.5$, where the magnetic phase transition is of second order. The isothermal entropy change and the adiabatic temperature change upo…
A theoretical investigation of the combined effect of confinement geometry, valley degeneracy, crystallographic orientations, and anisotropy of the effective mass on the intraband absorption of the conduction band of $\mathrm{Si}$ nanocrystals is presented. We show that the coupling between the nanocrystal shape and a…
Abstract Surface-initiated atom transfer radical polymerization (ATRP) of (2,2-dimethyl-1,3-dioxolan-4-yl)methyl methacrylate (1) was carried out from an immobilized initiator on a silicon wafer to result in a high-density polymer brush, which was converted to the hydrophilic polymer brush consisting of 2,3-dihyroxypr…
The structure of hydrogen molybdenum bronze phase III, H x MoO 3 ( x ≈ 5 / 3 ) has been studied on the basis of a combined experimental−theoretical approach. Our study of the average structure allows us to qualify previous contradictory results concerning the octahedral distortions and show no sign of hydrogen occupat…
Lanthanide complexes have wide applications in biochemical research and biomedical imaging. We have designed and synthesized a new class of macrocyclic lanthanide chelates, Ln/DTPA-PDA-C(n), for cell labeling and magnetic resonance imaging (MRI) applications. Two lipophilic Gd3+ complexes, Gd/DTPA-PDA-C(n) (n = 10, 12…
Abstract New aromatic polyamides were synthesized by the microwave‐assisted polycondensation of an optically active isosorbide‐derived diamine with different diacyl chlorides in the presence of a small amount of N‐methylpyrrolidinone. Polymers with inherent viscosities between 0.22 and 0.73 dL/g were obtained correspo…
Relaxation and aging behaviors in three supercooled liquids: m-toluidine, glycerol, and sucrose benzoate have been studied by shear stress relaxation experiments in the time domain above and below their nominal glass transition temperatures. For the equilibrium state, the current study provides new data on the behavio…
Due to inadequate vascular perfusion brought about by vascular disease or trauma, there is a significant worldwide demand for a small diameter (<5 mm inner diameter [ID]) vascular graft for use as ...
Functionalized medium-chain-length polyhydroxyalkanoates (mclPHAs) have gained much interest in research on biopolymers because of their ease of chemical modification. Tailored olefinic mclPHA production from mixtures of octanoic acid and 10-undecenoic acid was investigated in batch and dual (C,N) nutrient limited che…
Abstract Summary: Ultrafine fibers were spun from poly( D , L ‐lactide) (PDLA) solution using a homemade electrospinning set‐up. Fibers with diameter ranging from 350 to 1 900 nm were obtained. Morphologies of fibers and distribution of fiber diameters were investigated varying concentration and applied voltage by sca…
We report the results of a model calculation for studying the effects of pressure on a bunch of carbon nanotubes as well as individual nanotubes. Carbon nanotubes are extremely rigid in the axial direction. At pressures that we work with, the deformation in the axial direction comes out to be negligibly small in compa…
To increase an orthopedic implant's lifetime, research trends have included the development of new titanium alloys made of nontoxic elements with suitable mechanical properties (low Young's modulus - high fatigue strength), good workability and corrosion resistance. In accordance with the background on titanium and me…
Piezoelectric force microscopy is employed to study the ferroelectric domain structure in a 600nm thick epitaxial BiFeO3 film. In the as-grown film, a mosaic-like domain structure is observed. Scans taken with the cantilever pointing along the principal crystallographic directions enabled us to reconstruct the polariz…
We characterize three nonstandard electrohydrodynamic instabilities in nematic liquid crystals composed of bent-core molecules. In addition to their shape, another important attribute of this material is that the anisotropy in the electrical conductivity changes sign as the frequency of the applied electric field chan…
Great improvement in the output power density of diamond FETs on a diamond homoepitaxial layer grown using a high-purity source gas is reported. For a device with a gate length of 0.1 µm and gate width of 100 µm, at 1 GHz, maximum output power density of 2.1 W/mm, maximum power gain of 10.9 dB, and power added efficie…
Abstract This paper describes the classification of magnetic point and space groups which are also referred to as antisymmetry groups or black-and-white groups . These groups play an important role in the description of discrete point sets in which the points are not only characterized by their spatial coordinates but…
We predict theoretically that the effective in-plane thermal conductivity of polar, amorphous thin films can be increased by surface phonon-polaritons significantly beyond their intrinsic bulk values. We show that the thermal conductivity due to surface phonon-polaritons increases with decreasing film thickness. In pa…
The dielectric spectra of CaCu3Ti4O12 is characterized by a large permittivity (εr&gt;10000) with only a weak dependence on temperature over the temperature range 200–400 K. In this work, doping with 0.1–1.0 wt % ZrO2 has been shown to dramatically reduce the dielectric loss. At 0.5 wt % ZrO2,tanδ remains below 0.…