Materials Literature
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Cross-linked polyurethanes (PUs) based on poly(1,4-butane diol), 4,4′-diphenylmethane diisocyanate, 1,6 hexamethylene diisocyanate with a varied content and nature of the hard segment and a constant soft segment length were hydrolytically degraded in distilled water at 37°C. The incubation of polymer samples took plac…
Properties of natural rubber (NR) filled with various loadings of ultra-fine vulcanized acrylate rubber powder (ACMP) were investigated. ACMP loading was varied from 0 to 20 phr and, after compounding, the compound properties were determined. Results reveal that increasing ACMP loading leads to improved processability…
Abstract Three types of PEGylated polyamidoamine (PAMAM) dendrons were synthesized through PEGylation of primary amines at the periphery of second, third, and fourth generation dendrons. Au(III) precursors and the synthesized PEGylated PAMAM dendrons were mixed at various pHs to evaluate the effect of pH on gold nanop…
Nanoparticle morphology could be engineered and fine-tuned based on a novel in situ template method. Different shapes of platinum nanoparticles were obtained from very low concentrations of precursors and could be isolated exclusively inside the mesochannels of SBA-15. This was achieved by dispersing a platinum precur…
In this paper we study helical inclusions of a certain shape (called the “optimal shape”), such that the electric, magnetic, and magneto-electric polarizabilities are equal, and discuss unusual reflection properties of artificial materials based on such inclusions. We study helical particles with optimized design para…
Internal friction measurements were performed on various ⟨111⟩ tilt and twist grain boundaries in high-purity Al bicrystals. The temperature dependence of the grain boundary internal friction peak was determined, and the activation parameters of grain boundary relaxation were obtained. These parameters were found to c…
Abstract A series of new metal‐free blue emission compounds, i.e., diprotonated terpyH 2 ClPF 6 ( 1 ), tterpyH 2 ClPF 6 ( 2 ), ClterpyH 2 ClPF 6 ( 3 ), and BterpyH 2 (PF 6 ) 2 ( 4 ), were prepared and characterized by electrospray ionization mass spectrometry, UV–vis spectroscopy, and cyclic voltammetry (CV). Abbrevia…
Reactions of scandium and yttrium monoxide molecules (ScO and YO) with monochloromethane have been studied in solid argon by infrared absorption spectroscopy and density functional theoretical calculations. The metal monoxide molecules were prepared by laser-evaporation of bulk metal oxide targets. The results show th…
Abstract The IPI‐POSS‐modified epoxy resin (IPEP) was prepared from isocyanato‐propyldinethylsilyl‐isobutyl‐POSS (IPI‐POSS) and diglycidyl ether of bisphenol A epoxy resin. The steric hindrance of the IPEP bulky POSS side chain improved the curing activation energies. The POSS particles sizes were about 2–3 nm and dis…
Cover: The image presents the relaxation of a melt of dense polymer globules into a standard entangled melt. Short chains expand isotropically in space while very long chains relax by reeling out ends, as illustrated by the time-dependent ratio of the squared end-to-end distance and radius of gyration (inset). Further…
This research is a study on ultrahigh molecular weight polyethylene (UHMWPE-GUR 1020) implanted with 100–300 keV ions in order to modify its surface chemical, physical, and mechanical properties. Boron, nitrogen, argon, and xenon ions, at doses between 1012 and 1016/cm2, have been employed to irradiate polyethylene in…
Introduction In 1846 Charles Darwin wrote: ‘On the 16th of January (1833), when the Beagle was ten miles off the N. W. end of St. Jago (Cape Verde Islands), some very fine dust was found adhering to the under side of the horizontal wind-vane at the mast-head; it appeared to have been filtered by the gauze from the air…
Abstract Chain‐growth condensation polymerization of p ‐aminobenzoic acid esters 1 bearing a tri(ethylene glycol) monomethyl ether side chain on the nitrogen atom was investigated by using lithium 1,1,1,3,3,3‐hexamethyldisilazide (LiHMDS) as a base. The methyl ester monomer 1a afforded polymer with low molecular weigh…
Introduction Diatoms are an important and often dominant component of the benthic microalgal assemblage in estuarine and shallow coastal environments. This chapter will be concerned mainly with the motile diatom assemblages of intertidal sediments in these environments and secondarily with diatom assemblages epiphytic…
A simple and effective top gate fabrication was realized to construct a dual-gate structure on graphene. In addition to the SiO 2 /highly doped Si bottom gate, an aluminum layer was directly deposited on the graphene, followed by natural oxidation in the atmosphere, to form the top gate and dielectric layer underneath…
Abstract The synthesis of symmetrical fluorinated and nonfluorinated zinc(II) phthalocyanine derivatives obtained from 4,5‐dichlorophthalonitrile, 4‐nitrophthalonitrile and 3‐nitrophthalonitrile substituted with 2,2,3,3‐tetrafluoro‐1‐propanol and n ‐propanol are described. The comparison of the photophysicochemical pr…
Introduction The Antarctic continent holds the majority of the earth's freshwater in the form of ice. However, life is dependent upon liquid water, which is scarce in Antarctica. Less than 5% of the continent is ice-free, and it is within these ice-free regions that freshwater lakes and ephemeral streams form by the m…
Introduction Brackish waters comprise a range of exclusive habitats which can be subdivided into three major categories: transition zones between freshwater and marine habitats, transition zones between hyperhaline water and marine habitats, and inland waters (no marine water exchange, see Fritz et al. (this volume) w…
Air-sensitive complexes {Fe(NO)(2)}(9)-{Fe(NO)(2)}(9) [Fe(mu-SC(6)H(4)-o-N(CH(3))(2))(NO)(2)](2) (1), {Fe(NO)(2)}(9)-{Fe(NO)(2)}(10) [Fe(mu-SC(6)H(4)-o-N(CH(3))(2))(NO)(2)](2)(-) (2), the anionic {Fe(NO)(2)}(10) [(SC(6)H(4)-o-N(CH(3))(2))Fe(NO)(2)](-) (3), and the anionic {Fe(NO)(2)}(10)-{Fe(NO)(2)}(10) [Fe(NO)(2)(mu-…
We employ a parallel, three-dimensional level-set code to simulate the dynamics of isolated dislocation lines and loops in an obstacle-rich environment. This system serves as a convenient prototype of those in which extended, one-dimensional objects interact with obstacles and the out-of-plane motion of these objects…