Materials Literature
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Composites of high-density polyethylene (HDPE) with coconut coir as the fiber and stearic acid (SA) as the coupling agent were fabricated by compression molding. Coconut coir in the form of braided fibers and whiskers were used for the study. Incorporation of the coir, buckled the composites and decreased their tensil…
Ti(CH 2 t Bu) 4 ( 1 ) reacts selectively with the surface silanols of a silica−alumina partially dehydroxylated at 500 °C to provide the monosiloxy species [(≡SiO)Ti(CH 2 t Bu) 3 ] SA ( 2a ) and the bisiloxy species [(≡SiO) 2 Ti(CH 2 t Bu) 2 ] SA ( 2b ) in a ca . 40:60 ratio, with concomitant evolution of 1.6 ± 0.2 eq…
Photooxidation of pyrrole adducts 7-10 has been investigated in order to establish a general reaction pattern and mechanism for the formation of the resulting oxygenated products. The reactions were performed in several solvents utilizing both type I and type II sensitizers. In most cases, photooxidations gave complex…
Parametric appraisal of a dry sliding wear process is presented for a set of new composites consisting of polyester as the matrix, flakes of pine-bark as the fibrous reinforcing component, and the kiln-dust of a cement plant as the filler. The filler content in the composites is fixed at 50 wt%, while the weight fract…
Abstract A resume is given on relationships between minerals and materials. It is shown that Nature has many advantages over technology which can be profitably exploited for finding new materials with useful properties. However, Nature has also inherent limitations. Therefore, it seems advisable to use the knowledge o…
We have solved and refined the crystal structure of the orthorhombic γ-phase of Ca(BD 4 ) 2 by combined synchrotron X-ray powder diffraction, neutron powder diffraction, and ab initio calculations. Among five structural candidates giving the same quality of the fit of the diffraction data, the structural model with th…
Coir yarn-reinforced polypropylene (PP)-based unidirectional composites were prepared by compression molding. Coir yarn content in the composite was optimized and 20% yarn content showed higher mechanical properties. Jute yarns (20%—100%) were incorporated into the coir-based composites. It was found that 20% coir and…
Scatterometry as a non-imaging indirect optical method in wafer metrology is also relevant to lithography masks designed for extreme ultraviolet lithography, where light with wavelengths in the range of 13 nm is applied. The solution of the inverse problem, i.e. the determination of periodic surface structures regardi…
Under 980 nm excitation, Eu(3+)/Tm(3+)/Yb(3+) tri-doped YF(3) nanocrystals emitted ultraviolet and visible fluorescence. Besides the upconversion emissions from Tm(3+) ions, not only were the unusual (5)D(2)-->(7)F(3), (5)D(3)-->(7)F(J) emissions of Eu(3+) observed, but also the ultraviolet upconversion luminescence o…
The radical cation salt, ${\text{ET}}_{2}\text{MnCu}{[\text{N}{(\text{CN})}_{2}]}_{4}$, $[\text{ET}=\text{bis}(\text{ethylenedithio})\text{tetrathiafulvalene}]$ with an unusual three-dimensional anionic polymeric network is studied by x-ray diffraction, static susceptibility measurements, and electron spin resonance (…
Composite organogels based on 1,3,5-tris(4-dodecyloxybenzoylamino)phenylbenzene (DBAPB), a known gelator, and N,N'-di(octadecyl)-perylene-3,4,9,10-tetracarboxylic diimide (C18PTCDI), a nongelator dye, have been achieved, leading to controllable color and emitting color changes. SEM images and XRD patterns revealed tha…
Biomineralization is an intricate process that relies on precise physiological control of solution and interface properties. Despite much research of the process, mechanistic details of biomineralization are only beginning to be understood, and studies of additives seldom investigate a wide space of chemical condition…
Metal oxide- and zeolite-supported mononuclear gold complexes have been inferred, on the basis of spectroscopic data, to be catalytically active for alkene hydrogenation and CO oxidation. However, direct evidence that the catalysts are isolated, individual gold complexes in the absence of gold clusters or particles ha…
This work performs a computational study on the thermal expansion behavior of covalent organic frameworks (COFs). The results demonstrate that COFs show negative thermal expansion (NTE), and the origin of the NTE behavior is the motion of the aromatic carbon rings with temperature, providing a better understanding of…
We developed a green, low-cost, bioinspired aqueous synthesis method to fabricate one-dimensional (1D) vertically aligned ZnO nanorod arrays on zinc substrates at room temperature. Scanning electron microscopy images, transmission electron microscopy images, and energy-dispersive X-ray spectrum show densely well-align…
The diffusion of moisture‐related species into both tetragonal and cubic single crystals at temperatures characteristic of moisture‐enhanced low‐temperature degradation of tetragonal zirconia is reported using secondary ion mass spectrometry (SIMS). The crystals were immersed in D and O 18 isotopically labeled water a…
Abstract FT‐IR and FT‐Raman spectra of 4‐chloro‐2‐(3‐chlorophenylcarbamoyl) phenyl acetate were studied. Vibrational wavenumbers and corresponding vibrational assignments were examined theoretically using the Gaussian03 set of quantum chemistry codes and the normal modes are assigned by potential energy distribution (…
A color filter incorporating a two-dimensional (2D) submicrometer metal grating is proposed. The device is designed by utilizing rigorous coupled-wave analysis (RCWA) and consists of four parts: a polymethyl methacrylate (PMMA) substrate, a dielectric film of high refractive index, a submicrometer grating, and a diele…
We report on the structural and electrical characterization of Mo thin films deposited at room temperature by RF magnetron sputtering. The effect of RF power on the morphology and residual stress of the films is analyzed. The films are under compressive stress and consist of densely packed columns with a lateral size…
Bulk Ti 3 AlC ceramic containing 2.68 wt% TiC was prepared by an in situ reaction/hot‐pressing route. The reaction path, microstructure, mechanical and thermal properties were systematically investigated. At room temperature Vickers hardness of Ti 3 AlC ceramic is 7.8 GPa. The flexural strength, compressive strength,…