Materials Literature
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This paper presents the complete development and experimental validation of a microsystem designed to systematically assess the impact of surface topography on cell adhesion and dynamics. The microsystem includes two pools for culturing cells and for including chemicals. These pools are connected by several channels t…
Surface particulate contamination on optics can lead to laser-induced damage hence limit the performance of high power laser system. In this work we focus on understanding the fundamental mechanisms that lead to damage initiation by metal contaminants. Using time resolved microscopy and plasma spectroscopy, we studied…
We present an accurate theoretical model for the charge dependence of kinetic energy transferred in collisions between slow highly charged ions (HCIs) and the atoms in a carbon solid. The model is in excellent agreement with experimental kinetic-energy-loss data for carbon nanomembrane and thin carbon foil targets. Th…
A modified fluidized bed reactor is developed to homogenously coat micrometer‐sized particles with reactive polymer films using CVD. This technique is found to be rapid (∼30 min per batch) and scalable (up to 1 g particles), and can create homogenous coatings on microparticles down to 10 μm in diameter. By tuning crit…
Thin coatings of high-molecular weight poly(acrylic acid) (PAA) and poly(hydroxyethyl methacrylate) were deposited onto carbon fibers by means of atmospheric electrospray ionization (ESI) as adhesion promoters in carbon fiber–epoxy resin composites. The carbon fibers were completely wrapped by pinhole-free polymer coa…
At high dopant concentrations in Ge, electrically activating all implanted dopants is a major obstacle in the fulfillment of high-performance Ge-channel complementary metal oxide semiconductor devices. In this letter, we demonstrate a significant increase in the electrically-active dopant fraction in In-implanted Ge b…
In this paper, we fabricated NaYF 4:Yb3+, Er3+, Tm3+nanocrystal/opal photonic crystal composites by depositing NaYF 4:Yb3+, Er3+, Tm3+nanocrystals on the surface of opal photonic crystals, and we investigated the influence of photonic bandgaps on upconversion (UC) emission properties of NaYF 4:Yb3+, Er3+, Tm3+nanocrys…
We show theoretically that in an external magnetic field, like charges on top of graphene monolayer may be mutually attracted to form macromolecules. For this to happen, graphene needs to be in a quantum Hall plateau state with the local chemical potential being between the Landau levels. One or several graphene elect…
In strong topological insulators protected surface states are always manifest, while in weak topological insulators (WTIs) the corresponding metallic surface states are either manifest or hidden, depending on the orientation of the surface. One can design a nanostep on the surface of a WTI such that a protected helica…
We have performed polarized Raman scattering measurements on the newly discovered superconductor Ta4Pd3Te16 (T(c) = 4.6 K). We observe 28 out of 33 Raman active modes, with frequencies in good accordance with first-principles calculations. Although most of the phonons observed vary only slightly with temperature and d…
Most modern wear resistant materials feature a multiphase microstructure and the macroscopic wear behavior is controlled by the local mechanical properties of the single phases. Indentation testing and in particular nanoindentation allows for the local mechanical characterization of materials and their phases. This pa…
Hydroxyapatite Ca10(PO4)6(OH)2 is a calcium phosphate compound which is a bioactive ceramic material with high bioafinitas, used as bone implants, adsorbents and catalysts. Synthesis of hydroxyapatite can be made by using material which is rich of CaCO3 like PCC blood calm shell with a composition of 95.5% CaCO3. In t…
Admittance–voltage profiling of AlxGa1−xN/GaN heterostructures was used to determine the frequency dependent capacitance and conductance of FET devices in the frequency range from 50 Hz to 1 MHz. The nominally undoped low pressure metal-organic vapor-phase epitaxy structures were grown with an Al-content of 30%. An ad…
Carbon fibers were pretreated by ultrasonic agitation and then were used to manufacture carbon fiber-reinforced wood composites (CFRWCs). The modulus of rupture (MOR) and the modulus of elasticity (MOE) for the CFRWCs were measured. The effects of the compounding pattern and proportion of carbon fiber on the dynamic p…
To understand the role of the nanophase in reducing the lattice contribution of the thermal conductivity of thermoelectrics, the structure and phonon density of a p-type half-Heusler thermoelectric ingot (ingot-HH, nominal composition of (Hf0.5Zr0.5)Co(Sb0.8Sn0.2)), and its nano form prepared from ball milling (nano-H…
Hybridized two-dimensional materials incorporating domains from the hexagonal boron nitride (h-BN) and graphene is an interesting branch of materials science due to their highly tunable electronic properties. In the present study, we investigate the hydrogenated two-dimensional (2D) h-BN/C superlattices (SLs) with zig…
In this paper, the effects of the molecular weight of a polycarbonate (PC) matrix on the phase morphology and optical properties of a PC/styrene-co-acrylonitrile (SAN) blend were investigated. A scanning electron microscope is used to analyze the phase morphology of the blends, and Mie scattering theory is used to ana…
This research considered cementitious composites reinforced with macroscale, microscale and nanoscale fibres. Ten test groups including a combination of the multiscale fibres (steel fibres, polyvinyl alcohol (PVA) fibres and carbon nanofibres (CNFs)) were studied. An experimental programme was developed to determine t…
Despite the fact that silicon material can be synthesized from various sources, deriving them from silica resources is of strategic significance for the industrial processing. Here a low-cost nano/micro structure of Si–CNT was derived from nano-SiO2 and multiwall carbon nanotubes (MWCNTs) with simple methods. By emplo…
We report the use of epsilon near zero (ENZ) metamaterial to control spontaneous emission from Zinc-Oxide (ZnO) excitons. The ENZ material consists of alternating layers of silver and alumina with subwavelength thicknesses, resulting in an effective medium where one of the components of the dielectric constant approac…