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。
Abstract A review of recent trends in the dispersion, purification, and assembly of colloidal nanoparticles highlights a number of growing analogies with ideas borrowed from polymer science. Beyond the similar scales of size, several key concepts lying at the foundation of polymer physics—such as polydispersity, fract…
Porous Si thermal conductivity was determined in a wide temperature range from 20 to 350 K using the steady-state direct current method and a subsequent finite element method. The method was applied to a 40 µ m thick porous Si layer of ∼60% porosity, formed on p-type Si of resistivity 1–10 Ω cm. It was found that in t…
ABSTRACT Pentaerythritol‐aluminum (PE‐Al) was synthesized by a solid‐phase reaction in this study. The formation and characteristics of PE‐Al were confirmed by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). SEM images showed that the shapes of PE‐Al particles were spherical and…
We use scanning tunneling microscopy to map the surface structure, nanoscale electronic inhomogeneity, and vitreous vortex phase in the hole-doped superconductor Sr${}_{0.75}$K${}_{0.25}$Fe${}_{2}$As${}_{2}$ with ${T}_{c}=32$ K. We find that the low-$T$ cleaved surface is dominated by a half Sr/K termination with $1\i…
Composites of polyvinyl alcohol (PVA) filled with zinc oxide (ZnO) nanoparticles were synthesized in a ball mill machine. Analysis of the milling products was performed by X-ray diffraction. Thermogravimetric analysis revealed that three factors control the thermal stability of this polymer: (1) temperature dependence…
Hybrid organic-inorganic compounds are an intriguing class of materials that have been experimentally studied over the past few years because of a potential broad range of applications. The electronic and magnetic properties of three organic-inorganic hybrid compounds with compositions (NH4)2CuCl4, (CH3NH3)2CuCl4 and…
The functionalization of two-dimensional electron gas (2DEG) at oxide interfaces can be realized integrating 2DEG with multifunctional oxide overlayers by epitaxial growth. Using a ferroelectric Pb(Zr0.2 Ti0.8 )O3 overlayer on 2DEG (LaAlO3 /SrTiO3 ), we demonstrate a model system of the functionalized 2DEG, where elec…
Bismuth telluride nanoparticles (NPs) have been synthesized using a low-temperature wet-chemical approach from bismuth(III) oleate and tri-n-octylphosphine telluride. The size and shape of the NPs can be controlled by adjusting the temperature, reaction time, and nature of the surfactants and solvents. Aromatic hydroc…
We have completely determined the Fermi surface in KFe${}_{2}$As${}_{2}$ via de Haas--van Alphen (dHvA) measurements. Fundamental frequencies $\ensuremath{\epsilon}$, $\ensuremath{\alpha}$, $\ensuremath{\zeta}$, and $\ensuremath{\beta}$ are observed in KFe${}_{2}$As${}_{2}$. The first one is attributed to a hole cylin…
The static first and second hyperpolarizabilities (referred to as β and γ, respectively) of asymmetric open-shell singlet systems have been investigated using the asymmetric two-site diradical model within the valence configuration interaction level of theory in order to reveal the effect of the asymmetric electron di…
Controlling heat flow by phononic nanodevices has received significant attention recently because of its fundamental and practical implications. Elementary phononic devices such as thermal rectifiers, transistors, and logic gates are essentially based on two intriguing properties: heat diode effect and negative differ…
Four novel BODIPY derivatives (π-) functionalized by different polymerizable groups, styrene (S), phenyl acrylate (PhA), ethyl methacrylate (EtMA) and ethyl acrylate (EtA) have been synthesized. Following a formerly established one-pot RAFT miniemulsion polymerization process ( Grazon Macromol. Rapid Commun. 2011, 32,…
Supported Au–Ni nanocatalysts consisting of Au nanoparticles decorated with Ni/NiO nanostructures were synthesized using a two-step method and characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. The structural characterization indic…
A series of Cu 1- x Zn x Fe 2 O 4 ferrite (with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) compositions were synthesized using the standard solid-state reaction technique. X-ray diffraction was used to study the structure of the above investigated samples. The theoretical and experimental lattice parameters ( a th and a e…
The higher-order structure in multicomponent polymeric systems is governed by the kinetic as well as thermodynamic factors, because both crystallization and molecular diffusion are relatively slow in polymers. In crystalline/amorphous polymer blends, the higher-order structure is formed by the competition or interplay…
The oxygen nonstoichiometry of mixed conducting perovskite-structured Ba x Sr 1– x Ti 1– y Fe y O 3– y /2+δ (BSTF) ( x = 0, 0.1, 0.5 and y = 0.05, 0.35) was measured by means of thermogravimetry as a function of oxygen partial pressure, p O 2, in a temperature range typical for solid oxide fuel cell (SOFC) cathode app…
The direct synthesis of an acid-labile polyphosphoramidate by organobase-catalyzed ring-opening polymerization and an overall two-step preparation of polyphosphodiester ionomers (PPEI) by acid-assisted cleavage of the phosphoramidate bonds along the backbone of the polyphosphoramidate were developed in this study. The…
ABSTRACT The aim of this article is to construct broadband ultra thin absorbers using metamaterials in microwave frequencies (C‐band) for lower band surveillance and air defense applications. The frequencies of absorptions have been brought closer by parametric optimization of electric field driven LC structures to gi…
Er3+/Yb3+ co-doped LiYF4 nanocrystals were prepared by a facile solvothermal method. By adjusting the LiOH concentration, LiYF4 crystals with the size range from 16 nm to 2.0 μm were synthesized. Under the excitation by a 976 nm laser, upconversion quantum efficiency of the LiYF4: Er3+/Yb3+ samples were measured. It w…
It is shown that diffusion-limited classical nucleation theory (CNT) can be recovered as a simple limit of the recently proposed dynamical theory of nucleation based on fluctuating hydrodynamics [J. F. Lutsko, J. Chem. Phys. 136, 034509 (2012)]. The same framework is also used to construct a more realistic theory in w…