Materials Literature
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An experimental comparison of the performance of single- and double-layer planar lens lithography has been carried out. A direct comparison is made with a single 50 nm silver lens and a double silver lens with two 30 nm layers. Sub-diffraction-limited features have been imaged in both cases, with dense grating periods…
Polymorph farming on a chip is a promising for rapid polymorph discovery by transforming crystallization-crystal isolation-characterization Into one time-efficient step.
Abstract ZnO/GaN p‐i‐n heterojunctions light emitting diodes were fabricated by plasma‐assisted molecular beam epitaxy. We make use of high resistivity of nitrogen doped ZnO to fabricate n‐ZnO/i‐ZnO/p‐GaN heterojunction light emitting diode. The emission of i‐ZnO was obtained due to the limitation effect of i‐ZnO on e…
Chaos is present in non-linear systems that describe temporal phenomena in the physical and life sciences. Well-known instances of chaos include the logistic map, the Lorenz equations, and forced non-linear oscillators. The regular and chaotic dynamics of free gas bubbles and gas-encapsulated microbubbles (contrast ag…
This article reviews the current understanding of the miscibility of binary blends composed of polyethylenes, including high-density polyethylene, low-density polyethylene, and linear low-density polyethylenes prepared with the use of Ziegler-Natta and metallocene catalysts. It has been generally found that difference…
Hyper-Raman scattering, the nonlinear (two-photon excited) analogue of ordinary Raman scattering, is usually considered to be a weak process that requires high-energy pulsed laser excitation. The sensitivity can be improved greatly by making use of two-photon electronic resonance and/or electromagnetic field enhanceme…
Highly reflective front-surface silver mirrors are needed for many optical applications. While various protective dielectric coating schemes have been developed, the long-term durability of Ag mirrors is still of great concern in the optics community for a variety of applications under harsh environments. The corrosio…
Abstract The effect of the molecular structure of xylan on its assembly onto softwood kraft pulps was investigated. Various xylan-rich fractions were isolated from birch wood chips by different mild treatments using water (H 2 O), acetic acid (HAc) and sulfur dioxide (SO 2 ). The isolation involved prehydrolysis follo…
The scientific and applied corrosion literature has been reviewed in order to establish the state of the art knowledge on the general corrosion of copper. Based on the evaluation of electrochemical fundamentals of corrosion processes and the chemical composition of solid corrosion byproducts on internal pipe surfaces,…
Abstract The clay mineralogy of the Cretaceous strata of the British Isles is described and discussed within its lithostratigraphical and biostratigraphical framework using published and unpublished sources as well as 1400 new clay mineral analyses. The regional clay mineral variation is described systematically for t…
The process for the production of biodegradable plastic material (polyhydroxyalkanoates, PHAs) from microbial cells by mixed-bacterial cultivation using readily available waste (renewable resources) is the main consideration nowadays. These observations have shown impressive results typically under high carbon fractio…
Two industry-standard steam turbine blading steels, FV566 containing 11% Cr and FV520B containing 13.5% Cr by weight, are characterized with respect to chloride-induced pitting corrosion using potentiodynamic polarization measurements and the scanning vibrating electrode technique (SVET). In deaerated aqueous sodium c…
Abstract In this work, an alternative method to the Arrhenius equation for thermogravimetric analysis (TGA) is presented. It is based in performing a logistic regression of the raw TGA data. This model assumes that more than one physical process may be involved in each mass loss step and that each physical process may…
Polymer scaffolds tailored for tissue engineering applications possessing the desired pore structure require reproducible fabrication techniques. Nondestructive, quantitative methods for pore characterization are required to determine the pore size and its distribution. In this study, a promising alternative to tradit…
Spectrally and time-resolved single-molecule fluorescence spectroscopy was used to investigate fluctuations of the photophysical characteristics of different types of semiconductor nanocrystals (NCs) at room temperature. Correlation of photoluminescence (PL) emission maxima, decay time, and intensity of individual NCs…
We review both the theoretical electromagnetic response and the spectroscopic measurements of metamaterials. To critically examine published results for metamaterial structures operating in the range from terahertz to optical frequencies, we focus on protocols allowing one to extract the optical constants from experim…
Abstract The layered double hydroxides‐supported diisopropylamide (LDH‐DA) catalyst is found to be an efficient and selective solid base for aldol, Knoevenagel, Henry, Michael, transesterification and epoxidation reactions under liquid phase conditions. LDH‐DA is synthesized by the interaction of lithium diisopropylam…
In this article we present an enthalpy-based simulation for the evolution of equiaxial dendrites, growing in an undercooled melt of a pure substance. The enthalpy formulation, which is used extensively for macroscale modeling of solidification, is modified appropriately by combining relevant macroscale and microscale…
A mechanism is proposed for ammonia transport across a cellulose acetate membrane. The transport is shown to have a sorption character, with the formation of hydrogen bonds between ammonia molecules and the polymer. Our experiments demonstrate that the membrane can be regenerated in the course of gas separation. The i…
SrAl 2 O 4 :Eu 2+ phosphor crystals co‐doped with auxiliary activators such as La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or Y have been grown by the floating zone (FZ) technique. Photoluminescence spectrum (PL), time‐resolved PL, and thermally stimulated luminescence (TSL) are evaluated to clarify the long‐d…