Materials Literature
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In this article we interpret the mechanical properties of icosahedral quasicrystals with the dislocation theory. After having defined the concept of dislocation in a periodic crystal, we extend this notion to quasicrystals in the 6-dimensional space. We show that perfect dislocations and imperfect dislocations trailin…
Pyrrolidinedithiocarbamate (Pyr), piperidinedithiocarbamate (Pip), morpholinedithiocarbamate (Mor), diethanolaminedithiocarbamate (DEDC) and hexamethylenedithiocarbamate (Hex) sodium and potassium salts, were synthesized, characterized by IR, elemental analysis, 1 H and 13 C NMR and their thermal behaviors were invest…
Versatile solid superbases with strength in the 26.5≤H-<33.0 range were derived from magnesium–zirconium composite oxide and KOH through thermal treatment in a N2 flow. There are ample superbasic sites (0.590 mmol g −1 ). The materials show high catalytic activity in the Knoevenagel condensation, Michael addition a…
The purpose of this study is to investigate the effect of the surface modification of a layered silicate (magadiite) on the flammability of both polyurea and amine-cured epoxy resin. Based on the surface chemistry of magadiite, both quaternary alkyl ammonium and silane modifier can be employed for the organo-modificat…
Green coconut husk and curaua fibers were submitted to different chemical treatments—acid or alkaline followed by reaction with a silane compound—to improve compatibility between fiber and polypropylene (PP) matrix, in order to obtain composites with better properties than those of pure PP matrix for use as engineerin…
H 2 S even at very low concentrations can poison Ni based SOFC anodes.This paper presents the modeling of sulfur poisoning in Ni based anodes at low H 2 S concentrations (1 ppm -8 ppm).A kinetic model for predicting the fractional coverage of sulfur is developed by considering elementary step chemical reactions.The ra…
Ethene dimerization to 2-butenes was catalyzed by Ni-SILP complexes for the first time in a fluidized bed to improve heat removal.
The polymeric biomaterial film based on poly(vinyl alcohol) (PVA) and fish collagen of Lates calcarifer scale were synthesized by three times freeze-thaw cycles followed by gamma irradiation at varied doses of 0, 10, 20, and 30 kGy respectively. Characteristic of PVA/collagen film as effect of constituting polymers an…
The phase behavior of hard boardlike biaxial particles of relative dimensions close to the clamitic to discotic crossover is explored by means of Monte Carlo molecular simulations. Transitions between two distinct biaxial nematic phases as well as transitions from a biaxial nematic to a uniaxial Sm-A phase are obtaine…
Four new cyano-bridged bimetallic complexes, [{Mn(III)(salen)}2{Fe(III)(qcq)(CN)3}2]n·3nCH3CN·nH2O (1) [salen = N,N'-ethylenebis(salicylideneiminato) dianion; qcq(-) = 8-(2-quinoline-2-carboxamido)quinoline anion], [{Mn(III)(salpn)}2{Fe(III)(qcq)(CN)3}2]n·4nH2O (2) [salpn = N,N'-1,2-propylenebis(salicylideneiminato)di…
Using high-speed confocal microscopy, we measure the particle positions in a colloidal suspension under large-amplitude oscillatory shear. Using the particle positions, we quantify the in situ anisotropy of the pair-correlation function, a measure of the Brownian stress. From these data we find two distinct types of r…
In this study, we found that a chitin gel was facilely obtained by stirring a mixture of chitin with a highly concentrated CaBr2·2H2O/methanol solution at room temperature. We also examined the conversion of the resulting gel into a porous chitin by a regeneration technique. When the mixtures of chitin (0.9–3.5% (w/v)…
Growth of aragonite CaCO <sub>3</sub> crystals on titania coated cellulose fibres of filter paper was achieved to give a superhydrophobic composite.
Superconducting quantum interference devices (SQUIDs) incorporating thin film nanobridges as weak links have sensitivities approaching that required for single spin detection at 4.2 K. However, due to thermal hysteresis they are difficult to operate at much lower temperatures which hinder their application to many qua…
Abstract Motivated by experiments showing that a sessile drop of volatile perfectly wetting liquid initially advances over the substrate, but then reverses, we formulate the problem describing the contact region at reversal. Assuming a separation of scales, so that the radial extent of this region is small compared wi…
A main goal in the construction of thin films is to control film growth in all aspects. Accurate control of the building blocks and their reaction sites is one way to achieve that. This is a key feature of the atomic layer deposition (ALD) technique. The aim of this study is to achieve such growth control of organic-i…
The friction behaviors of high-purity bulk Ti3AlC2 against low-carbon steel with or without current-carrying friction and its effect on wear characteristics were investigated. Experiments are performed on a block-on-disk-type friction tester with sliding speeds from 20 to 60 m/s, pressures from 0.4 to 0.8 MPa, and nom…
The robust, proteinaceous egg capsules of marine prosobranch gastropods (genus Busycotypus ) exhibit unique biomechanical properties such as high elastic strain recovery and elastic energy dissipation capability. Capsule material possesses long-range extensibility that is fully recoverable and is the result of a secon…
The 3-D coordination polymer with the basic formula Cd2(TCNQ)3.5(H2O)2 is the first instance of the coexistence of the bridging modes μ2, μ3 and μ4 for TCNQ in one network. Single crystal measurements revealed the compound to be a good semiconductor with a room temperature conductivity of 5.8 × 10(-3) S cm(-1).
The plasmonic properties of gold nanotube assemblies are investigated using time-dependent density functional theory (TDDFT). The plasmon resonance peak of gold nanotube assemblies is strongly dependent on the polarization direction and gap distance. The optical absorption exhibits that the resonances correspond to di…