Materials Literature
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We have studied the effects of accumulating cyclic electrical pulses of increasing amplitude on the non-volatile resistance state of interfaces made by sputtering a metal (Au, Pt) on top of the surface of a cuprate superconductor YBa2Cu3O7–δ. We have analyzed the influence of the number of applied pulses N on the rela…
We report on the characterization of microwave loss of thin aluminum oxide films at low temperatures using superconducting lumped resonators. The oxide films are fabricated using plasma oxidation of aluminum and have a thickness of 5 nm. We measure the dielectric loss versus microwave power for resonators with frequen…
In chemical functionalization of colloidal particles, the functional moieties are generally distributed rather homogeneously on the particle surface. Recently, a variety of synthetic protocols have been developed in which particle functionalization may be carried out in a spatially controlled fashion, leading to the p…
The magnetic phase diagram of a ground state is studied theoretically for graphene nanoflakes of bow-tie shape and various sizes in external in-plane magnetic field. The tight-binding Hamiltonian supplemented with Hubbard term is used to model the electronic structure of the systems in question. The existence of the a…
A classical molecular static technique (CMST) and DFT calculations using SIESTA, are employed here to characterize the self diffusion and the tracer solute diffusion in the bulk of BCC diluted $FeCr$ alloy driven by both vacancy and interstitial migration. For the first time in the literature, a six-frequency model (d…
We performed self-consistent modelling of electrotransport and electromechanical response of solid electrolyte thin films allowing for steric effects of mobile charged defects (ions, protons or vacancies), electron degeneration and Vegard stresses. We establish correlations between the features of the space-charge dyn…
A naphthalene diimide (NDI) building block containing hydrazide (H1) and hydroxy (H2) groups self-assembled into a reverse-vesicular structure in methylcyclohexane by orthogonal H-bonding and π-stacking. At an elevated temperature (LCST=43 °C), destruction of the assembled structure owing to selective dissociation of…
Multilayer steels have been developed to provide a novel route to achieving higher-performance steels by employing a high-strength steel and a high-ductility steel independently in the layer structure. In this article, a background to the development, design, fabrication, properties, and applications of multilayer ste…
This paper reports a facile fabrication of N‐doped graphene quantum dots (N‐GQDs) showing controllable chemical properties through a hydrothermal treatment. The N‐GQDs have a uniform size of 3.06 ± 0.78 nm and prefer the equilibrium shapes of circle and ellipse due to the minimization of edge free energy. The N/C atom…
A halogen-free phosphorus-containing triol named phosphoryltrimethanol (PTMA) was synthesized and used as a cross-linking agent and a reactive-type flame retardant to prepare inherently flame-retardant flexible polyurethane foam (FPUF). Incorporation of a low content (7.8 wt %) of PTMA into the polyurethane chains can…
Highly porous, sponge‐like boron nitride materials, namely microsponges (BNMSs), with ultrahigh surface areas up to 1900 m2 g‐1, are prepared by a facile, one‐step, template‐free reaction of boric acid and dicyanamide. Detailed analysis confirms the increase of the interlayer (0002) distances compared to standard grap…
Using electronic Raman spectroscopy, we report direct measurements of charge nematic fluctuations in the tetragonal phase of strain-free Ba(Fe(1-x)Co(x))2As2 single crystals. The strong enhancement of the Raman response at low temperatures unveils an underlying charge nematic state that extends to superconducting comp…
Ionomers are polymers with bonded ionic species that are used under conditions where the salt groups are in a condensed state. This Feature Article discusses the state of our understanding of ionomers and the historical applications of these nanostructured polymers. It also discusses modern methods for synthesizing ne…
In this work, the optical properties of carbon nanoparticles (CNPs) can be modulated by the dopant‐N atom and sp2 C‐contents. CNPs prepared with the low urea mass ratio of 0.2:1 (CNP1) exhibit blue emission (maximum PL quantum yield: 15%). Increasing sp2 C‐ and dopant‐N atom contents, as determined in CNPs prepared wi…
Solar cell substrates require high optical transparency but also prefer high optical haze to increase the light scattering and consequently the absorption in the active materials. Unfortunately, there is a trade-off between these optical properties, which is exemplified by common transparent paper substrates exhibitin…
通过静电纺丝法制备了含有Fe3 O4纳米粒子的TiO2纳米纤维，采用水热法对该纤维表面进行纳米Ag修饰，制备出具有较强磁性和较好光催化性能的复合纤维.采用 X 射线衍射（ XRD ）、扫描电子显微镜（ SEM）、透射电子显微镜（ TEM）和紫外-可见光谱（ UV-Vis）等对样品的结构和形貌进行表征，并以罗丹明B （ Rh B）水溶液降解为模型反应，考察样品在紫外光照射下的光催化性能.结果表明，所制备的TiO2为锐钛矿结构， Fe3 O4纳米粒子均匀分布在TiO2纤维中， Ag纳米颗粒比较均匀地分散在磁性TiO2纤维表面.经过纳米Ag修饰后，材料的光吸收能力大为增强，吸收带红移并扩展到可见光区.在紫外光照射40 min后，合成样品…
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A alvenaria estrutural traz um conjunto de vantagens técnicas e econômicas à indústria da construção civil, devido a ampliação da sua função de exclusivamente vedação para suporte da edificação, sendo cada vez mais resistente e eficiente. Além disso, tem-se a simplificação das técnicas construtivas o que permite maior…
A presente proposta tem como foco a utilização das espécies de madeiras da caatinga da região nordeste do Brasil, resistentes a estiagem, para fabricação de painéis de partículas de madeira. Foram realizados procedimentos para a fabricação dos painéis homogêneos com matéria prima das espécies: Angico (Anadenanthera ma…
Neste trabalho apresenta-se uma alternativa para estimar o majorador dos momentos de primeira ordem que deve ser aplicado em cada pavimento das estruturas de concreto armado, a partir dos valores obtidos par a os coeficientes gz e B2, utilizados para avaliar os efeitos de segunda ordem em estruturas de concreto armado…