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。
Using a combination of Landau theoretical analysis and first-principles calculations, we establish a spontaneous symmetry breaking of the metallic state of the 1T monolayer of MoS2 that opens up a band gap and leads to an unexpected yet robust ferroelectricity with ordering of electric dipoles perpendicular to its pla…
Preparation of graphene from chemical reduction of graphene oxide (GO) is recognized as one of the most promising methods for large-scale and low-cost production of graphene-based materials. This study reports a new, green, and efficient reducing agent (caffeic acid/CA) for GO reduction. The CA-reduced GO (CA-rGO) sho…
Icosahedral symmetry is ubiquitous in nature, and understanding possible deformations of structures exhibiting it can be critical in determining fundamental properties. In this work we present a framework for generating and representing deformations of such structures while the icosahedral symmetry is preserved. This…
The realization of phase discontinuities across metasurfaces has led to a new class of reflection and refraction. Here we present theory and experiment on the discontinuous propagation of wavepackets across subwavelength-thickness meta-atoms. Using acoustic waves, we observe the process of wavepackets traversing a met…
The present research is focused on the manufacturing and analysis of the thermal and electrical properties of advanced ceramics from alumina (Al 2 O 3 ) with carbon nanofiller (CNF) from oil palm ash (OPA). The oil palm ash was used to produce carbon black nanofillers with a size of 50 to 100 nm via a ball milling pro…
A simple, scalable method is reported to fabricate ordered hetero-structures of organic materials using template-directed growth. The 3D extension of the structures is firstly determined by pre-pattern size and deposition amount, and can further be in situ tuned by annealing at appropriate temperature.
We have investigated the magnetoresistance (MR) in a series of Zn doped (p-type) GaAs nanowires implanted with different Mn concentrations. The nanowires with the lowest Mn concentration (∼0.0001%) exhibit a low resistance of a few kΩ at 300 K and a 4% positive MR at 1.6 K, which can be well described by invoking a sp…
In this paper, ordered arrays of various ZnO nanostructures were fabricated on both Si and p-GaN substrates via a hydrothermal process by the self-assembled nanosphere lithography (NSL). The morphology and orientation evolution of ZnO nanostructures were well-monitored by varying seed-layer-thickness, solution concent…
A simple, but elegant, strategy for the simultaneous synthesis and welding of single-crystalline Mg 2 Si nanowires is presented. For the synthesis of Mg 2 Si nanowires, the solid-state phase transformation of presynthesized silicon nanowires was employed. For assembling the Mg 2 Si nanowires via the formation of Mg 2…
We investigated the transport properties of amorphous undoped and Ta-doped SnO 2 thin films grown on unheated glass substrates by pulsed laser deposition. Optimized films exhibited a resistivity of 2 × 10 −3 Ω cm, carrier density ( n e ) of (1–2) × 10 20 cm −3 , and were highly transparent in the visible region. Ta-do…
In this paper, we propose a circuit model for two-dimensional arrays of metallic square holes located on a homogeneous substrate, in order to propose a new scheme containing this type of metamaterials to obtain transparent electrodes with simultaneous terahertz transparency and low electrical resistance. The results o…
We report an optical spectroscopy study on single crystals of ${Na}_{2}$${Ti}_{2}$${As}_{2}O$, a sister compound of the superconductor Ba${Ti}_{2}$Sb${}_{2}O$. The study unexpectedly reveals two density wave phase transitions. The first transition, at 320 K, results in the formation of a large energy gap and removes t…
Abstract. We report a neutron scattering study of a ferroelectric phase transition in Sr0.61Ba0.39Nb2O6 (SBN-61). The ferroelectric polarization is along the crystallographic c-axis but the transverse acoustic branch propagating along the <1, 1, 0> direction does not show any anomaly associated with the…
ABSTRACT A model has been developed to simulate the foam characteristics obtained, when chemical (water) and physical (Freon) blowing agents are used together for the formation of polyurethane foams. The model considers the rate of reaction, the consequent rise in temperature of the reaction mixture, nucleation of bub…
In this work, to improve the interface interaction between natural fibers and a cementitious matrix, several Colombian Angustifolia kunth bamboo fibers were modified using different pretreatment methods before being covered with an inorganic phase of manganese oxide. The coating was performed by placing the fiber in c…
A method for fabrication of polarization degenerate oxide apertured micropillar cavities is demonstrated. Micropillars are etched such that the size and shape of the oxide front is controlled. The polarization splitting in the circular micropillar cavities due to the native and strain induced birefringence can be comp…
The pressure-dependent diffraction response of the superconducting phase-separated ${Cs}_{0.72}$${Fe}_{1.57}$${Se}_{2}$ (${T}_{\mathrm{c}}$ = 28.5 K) has been studied at room temperature using synchrotron radiation up to the pressure of 19 GPa. The main and secondary phases of ${Cs}_{0.72}$${Fe}_{1.57}$${Se}_{2}$ have…
Thermocapillary flow has proven to be a good alternative to induce and control the motion of drops and bubbles in microchannels. Temperature gradients are usually established by implanting metallic heaters adjacent to the channel or by including a layer of photosensitive material capable of absorbing radiative energy.…
Both the extent of SiO 2 doping and the mesopore size of alumina were investigated with the aim of developing a support that maintains high activity during the catalytic oxidation of diesel exhaust hydrocarbons and NO over 0.75 wt % Pt/0.25 wt % Pd even after high temperature treatment. By controlling the SiO 2 doping…
The addition of a low frequency RF (LFRF) component during plasma-enhanced chemical vapor deposition of porous SiCOH ultra low-κ films allowed for the incorporation of higher carbon content without lowering the Young's modulus or increasing the dielectric constant. The porous SiCOH films typically contain carbon bonde…