Materials Literature
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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…
Abstract In this article, macroinitiators with different glass transition temperature ( T g ) were synthesized by reversible additional‐fragmental chain transfer polymerization, and used to prepare polymer‐dispersed liquid crystals (PDLCs) with methyl acrylate. The memory effect of these PDLCs was investigated. The re…
Dense, vertically aligned multiwall carbon nanotubes were synthesized on TiN electrode layers for infrared sensing applications. Microwave plasma-enhanced chemical vapor deposition and Ni catalyst were used for the nanotubes synthesis. The resultant nanotubes were characterized by SEM, AFM, and TEM. Since the length o…
Abstract Miscible blends of three crystalline polymers, namely poly(butylene succinate) (PBS), poly(ethylene succinate) (PES), and poly(oxyethylene) (POE), exhibited interpenetrating spherulites, where a spherulite of one component grows inside the spherulites of other components. PBS and PES were immiscible above the…
New nanocomposites were synthesized by the reaction between a polyhedral oligomeric silsesquioxane (POSS) with eight epoxy groups (epoxy-POSS) and diglycidyl ether of bisphenol A (DGEBA) using Jeffamine D230 as curing agent. The reactivity of the systems was extensively studied by Raman spectroscopy. The hybrid materi…
Entropy and heat capacity are calculated in phase sequence of crystal, hexatic smectic- B , and smectic- A liquid crystals through constant pressure and temperature molecular-dynamics simulations of parallel soft spherocylinders. The transition from crystal to hexatic smectic- B phase is continuous while the transitio…
In this work we report the polymerization behaviour of natural clays (montmorillonites, MMT) as activating supports. These materials have been modified by treatment with different aluminium compounds in order to obtain enriched aluminium clays and to modify the global Brönsted/Lewis acidity. As a consequence, the intr…
We discuss the spectrum of a magnetic quantum dot in graphene. Such a dot can be formed by an inhomogeneous magnetic (or strain-induced pseudo-magnetic) field. We present detailed calculations for a circularly symmetric dot, where the magnetic field is constant except within a disk where it vanishes. The number of bou…
The rare-earth iron arsenides RE(12)Fe(57.5)As(41) (RE = La, Ce) have been prepared by direct reactions of the elements in the presence of a Sn flux. Analysis of single-crystal X-ray diffraction data reveals that they adopt a new orthorhombic structure type (Pearson symbol oP236, space group Pmmn, Z = 2; a = 10.8881(9…
The generation of white light from CdS nanoparticles (NPs) illuminated by UV-LED is presented. The synthesis of CdS nanoparticles from the reaction of CdCl2 and the sulfur dissolved in oleylamine in 1:2 mole ratio was used in the preparation of CdS nanocrystalline. The PMMA film doped with CdS nanoparticles was prepar…