Materials Literature
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Isotropic chemical shifts and quadrupole coupling parameters of 77 Se and 73 Ge nuclei in GeSe 2 and GeSe 4 glasses are determined through density-functional NMR calculations on amorphous model structures generated by ab initio molecular dynamics. The comparison with experimental NMR spectra enables structural assignm…
The present study investigates cellulose phosphate from oil palm biomass (OPEFB-CP) as a potential biomaterial. To this effect, oil palm biomass microcrystalline cellulose (OPEFB-MCC) was phosphorylated using the H3PO4/ P2O5/ Et3PO4/ hexanol method. Characterization of OPEFB-CP was performed using Scanning Electron Mi…
Structurally similar, magnetically diverse: The exchange and Zeeman parameters of two dimetallic, six-coordinate cobalt(II) compounds—i.e., with orbitally degenerate metal ions—have been determined by a combination of high-resolution EPR and INS spectroscopies, together with ab intio calculations. It is suggested that…
Abstract A new class of biodegradable copolyesters was synthesized by the catalyst‐free melt condensation of sorbitol with citric acid, tartaric acid, and sebacic acid. The resulting polymers were designated as poly(sorbitol citric sebacate) [p(SCS)] and poly(sorbitol tartaric sebacate) [p(STS)]. The synthesized polym…
The effect of narrow-band 172 nm and broad-band >200 nm UV sources in the new curing scheme of the plasma-enhanced chemical vapor deposition (PECVD) dielectrics is studied. The new curing scheme is based on porogen removal (organic sacrificial phase introduced to generate open porosity) from PECVD dielectric be…
Abstract We report in this article the results of nanosilica (SiO 2 )‐filled epoxy composites with different loadings and their electrical, thermal, mechanical, and free‐volume properties characterized with different techniques. The morphological features were studied by transmission electron microscopy, and different…
The structural and electronic properties of Zn 2 SnO 4 under high pressure have been investigated using the density functional formalism under the nonlocal B3LYP approximation. We have determined its stability against decomposition to ZnO and SnO 2 mixture, as well as toward recently observed orthorhombic phases, simi…
Geben und nehmen: X- oder H-förmige Superamphiphile bilden sich auf Basis gerichteter Ladungstransferkomplexe und führen zur Bildung eindimensionaler Nanostäbe und zweidimensionaler Nanoblätter (siehe Bild, blau: Pyridinium-Ion, rot: Naphthalinderivate, grün: Naphthalindiimid). Die Überstrukturen bilden sich als Folge…
Leakage current magnitude is used as one of the failure criteria in the tracking and erosion test IEC 60587. The 3rdharmonic is also often used to identify periods of arcing activity. This technique is not available for the equivalent dc test. This paper presents the use of a machine vision camera alongside measuremen…
The substitution of the complex borohydride anion BH 4 − in calcium borohydride by the larger iodide anion I − is explored in order to tailor the hydrogen storage properties. Three new compounds are identified in the Ca(BH 4 ) 2 −CaI 2 system and are structurally characterized using the Rietveld method and synchrotron…
This paper is aimed at the influence of the linear non uniformity of pollution layer on critical current Icriand critical flashover voltage Vcriof polluted insulator under lightning impulse voltage. It is shown that the experimental values of Icriand Vcriof uniformly and non-uniformly polluted insulator depends on the…
In this study, we present a novel, multifaceted pH-triggerable system of self-organized hierarchical nanostructures. The system consists of meso-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) and poly(2-vinylpyridine) cylindrical brushes (PVP brushes) and can yield polymer-porphyrin networks, porphyrin loaded polymer bru…
Polyhydroxyalkanoates (PHAs) are bacterial carbon storage polymers with diverse plastic-like properties. PHA biosynthesis in transgenic plants is being developed as a way to reduce the cost and increase the sustainability of industrial PHA production. The homopolymer polyhydroxybutyrate (PHB) is the simplest form of t…
The electrochemical interfaces of a glassy carbon (GC) electrode and a carbon nanotube (CNT) paper electrode have been studied in 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF 4 ) and 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF 4 ) ionic liquids (ILs) using direct current (DC) cyclic voltammetry (CV)…
A new principle for the implementation of tunable split ring resonators (SRRs) is presented. The rings forming the SRRs are partly fixed to the substrate (anchor) and partly suspended (up-curved cantilever). Through electrostatic actuation, the suspended parts are deflected down, the distributed capacitance between th…
Abstract A synergistic effect on flame retardancy, thermal stability, and mechanical properties was found when sepiolite was incorporated into a linear low‐density polyethylene (LLDPE)/magnesium hydroxide (MH) composite. Different amounts of sepiolite (up to a maximum concentration of 15 phr) were added to a standard…
Multistress aging/weathering of outdoor composite polymeric insulators has been a topic of interest for power transmission research community in the last few decades. This paper deals with the long-term accelerated weathering of full-scale distribution class silicone rubber composite insulators. To evaluate the long-t…
The partial discharge - current pulse waveform analyzing (PD-CPWA) system can measure partial discharge (PD) current pulses continuously in high speed, and is being used for the study of PD mechanisms in SF6gas in a laboratory. On the other hand, the ultra high frequency (UHF) method is becoming popular for the on-sit…
A concise, highly regioselective synthesis of 1,8-dibromo-4,5-dialkoxypyrenes has been developed and exploited in the synthesis of some 1,8-pyrenylene-ethynylene macrocycles. The (1)H NMR data and NICS calculations indicate that there is little or no macrocyclic ring current. Concentration-dependent UV-visible studies…
The pyridoxal-5'-phosphate-dependent enzymes (PLP enzymes) catalyze a myriad of biochemical reactions, being actively involved in the biosynthesis of amino acids and amino acid-derived metabolites as well as in the biosynthetic pathways of amino sugars and in the synthesis or catabolism of neurotransmitters. Although…