Materials Literature
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Here, we numerically investigate the existence of negative group refraction in graphene-based hyperbolic metamaterials (HMM) at THz frequencies. The hyperbolic dispersion of the graphene-based HMM can be tuned by varying the chemical potential and surrounding dielectric layer thickness. The negative group and positive…
Using qualitative considerations based on a two-center approximation for tight-binding-model matrix elements, we demonstrate that Rashba interactions in complex-oxide two-dimensional electron gases are due primarily to changes in metal-oxygen-metal bond angles at surfaces and interfaces. We verify this conclusion by c…
Dynamic behavior of micro water droplet condensed on a lotus leaf with two-tier roughness is studied. Under laboratory environment, the contact angle of the micro droplet on single micro papilla increases smoothly from 80° to 160° during the growth of condensed water. The best-known “self-cleaning” phenomenon will be…
The layer-by-layer (LbL) deposition method was used for the build-up of alternating layers of nanofibrillated cellulose (NFC) or carboxymethyl cellulose (CMC) with a branched, cationic polyelectrolyte, polyethyleneimine (PEI) on flexible poly (lactic acid) (PLA) substrates. With this procedure, optically transparent n…
The structure-property correlation in the lead-free piezoelectric ($1\ensuremath{-}x$)(Na${}_{0.5}$Bi${}_{0.5}$)TiO${}_{3}$-($x$)BaTiO${}_{3}$ has been systematically investigated in detail as a function of composition ($0<x\ensuremath{\le}0.11$), temperature, electric field, and mechanical impact by Raman scatteri…
In an effort to find alternatives to graphene, researchers have searched a crystallographic database to uncover 92 solids that should be easy to exfoliate into two-dimensional sheets with potentially useful electronic properties.
Stress hysteresis (H) and temperature dependence of phase transition stress (dσ/dT) are the two signatures of first-order phase transition in shape memory alloys. We studied the effects of grain size on these two properties in polycrystalline superelastic NiTi with the average grain size from 10 nm to 1500 nm. We iden…
Electrospun ZnO-SnO2 heterojunction nanofibers are demonstrated to be promising candidates for easily assembled fully transparent high-performance photodetectors.
Reading out the temperature-memory of polymers, which is their ability to remember the temperature where they were deformed recently, is thus far unavoidably linked to erasing this memory effect. Here temperature-memory polymer actuators (TMPAs) based on cross-linked copolymer networks exhibiting a broad melting tempe…
We demonstrate a tunable bandgap from 2.32 eV to 2.09 eV in phase-pure BiFeO3 by controlling the particle size from 65 nm to 5 nm. Defect states due to oxygen and microstrain show a strong dependence on BiFeO3 particle size and have a significant effect on the shape of absorbance curves. Oxygen-defect induced microstr…
In the quest to miniaturise photonics, it is of paramount importance to control light at the nanoscale. We reveal the main physical mechanism responsible for operation of gap plasmon-based gradient metasurfaces, comprising a periodic arrangement of metal nanobricks, and suggest that two degrees of freedom in the nanob…
The natural fiber-reinforced polymer composite materials offered extensive range of properties which are suitable for large number of engineering application. The natural fibers have been abundantly available in the world. It has unique properties compared to synthetic fiber and reduces the plastic usage. This article…
We present converged ab initio calculations of the optical absorption spectra of single-layer, double-layer, and bulk MoS${}_{2}$. Both the quasiparticle-energy calculations (on the level of the GW approximation ) and the calculation of the absorption spectra (on the level of the Bethe-Salpeter equation) explicitly in…
Semiconducting two-dimensional (2D) crystals such as MoS2 and WSe2 exhibit unusual optical properties that can be exploited for novel optoelectronics ranging from flexible photovoltaic cells to harmonic generation and electro-optical modulation devices. Rapid progress of the field, particularly in the growth area, is…
Multiwalled carbon nanotubes (MWCNTs) affected seed germination, growth, and the development of three important crops (barley, soybean, corn). Early seed germination and activation of growth in exposed seedlings was observed when MWCNTs were added to sterile agar medium. Similarly, seed germination was activated for a…
We have calculated the thermal conductivities ($\ensuremath{\kappa}$) of cubic III-V boron compounds using a predictive first principles approach. Boron arsenide is found to have a remarkable room temperature $\ensuremath{\kappa}$ over $2000\text{ }\text{ }\mathrm{W}\text{ }{\mathrm{m}}^{\ensuremath{-}1}\text{ }{\math…
Ferroelectric materials rely on some type of non-centrosymmetric displacement correlations to give rise to a macroscopic polarisation. These displacements can show short-range order (SRO) that is reflective of the local chemistry, and so studying it reveals important information about how the structure gives rise to t…
Understanding the behavior of commercially available hydrophobic polymer membranes is important for applications where separating a gas (or vapor) from a two-phase mixture with liquid is beneficial. For example, in-situ vapor extraction can be used in microscale heat sinks to improve heat transfer and flow stability.…
In the last decades, the run-up in both the fossil fuel prices and the related global warming turned the attention towards environmentally clean alternative energy resources. Among them, solar photovoltaics is a reliable choice to tackle the strong increase of the global energy demand. The development of low cost and…
We report the interfacial assembly of amphiphilic heteroarm star copolymers (PSnP2VPn and PSn(P2VP-b-PtBA)n (n = 28 arms)) on graphene oxide flakes at the air-water interface. Adsorption, spreading, and ordering of star polymer micelles on the surface of the basal plane and edge of monolayer graphene oxide sheets were…