Materials Literature
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Recent startling interest for lanthanide luminescence is stimulated by the continuously expanding need for luminescent materials meeting the stringent requirements of telecommunication, lighting, electroluminescent devices, (bio-)analytical sensors and bio-imaging set-ups. This critical review describes the latest dev…
Stressed liquid crystals are tested with two-wavelength sources and varying intensity inputs in order to further examine their functionality as phase modulating elements in Fourier transform spectroscopy.
INTRODUCTION In most of the discussion presented so far in this book, the quantum character of atoms and electrons has been ignored. The Ising spin models have been an exception, but since the Ising Hamiltonian is diagonal (in the absence of a transverse magnetic field!), all energy eigenvalues are known and the Monte…
A supramolecular assembly of [p-MePyNN]2[Au(CN)2]2 (1) (p-MePyNN+ = 2-(4-N-methylpyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazo-1-oxyl-3-oxide radical cation) has been synthesized from the combination of p-N-methylpyridinium nitronyl nitroxide radical cations and [Au(CN)2]− anions, and characterized structural…
Solidification processes are complex in nature, involving multiple phases and several length scales. The properties of solidified products are dictated by the microstructure, the macrostructure, and various defects present in the casting. These, in turn, are governed by the multiphase transport phenomena occurring at…
In recent years, use of inverter-driven induction motor in industries has continuously increased because of the demand for energy-saving, variable speed drives. However, these modern inverters introduce additional stresses into the motor's polymer insulation system. To prevent the premature motor failure, the new poly…
To ensure the adhesion of a coating to its substrate it is essential to form a mixture of chemical and physical (or mechanical) bonds between them. To achieve this, the substrate is often roughened or textured in a process known as surface modification (or adhesion promotion).
The feasibility of using activated carbon/nitrogen pair as an alternative to metal hydride–hydrogen combination in a compressor-driven sorption refrigerator (CDSR) has been studied in the present article. The motivation behind the selection of this particular adsorbent/adsorbate pair is due to its high heat of adsorpt…
This paper presents an investigation of the intrinsic magnetoresistance of a ferromagnetic shape memory alloy microactuator for position sensing. The microactuator is designed as a double-beam cantilever made of a polycrystalline Ni–Mn–Ga thin film, which exhibits both a martensitic transformation in the temperature r…
Abstract Rheological behavior was examined for biocomposites of rod‐like silk fibroin (SF) fiber and poly(ε‐caprolactone) (PCL) to investigate an effect(s) of the SF fiber network therein on the mechanical properties. At 160 °C where PCL was a homogeneous melt, linear viscoelastic tests revealed that the SF/PCL compos…
Iron–gallium (Galfenol) is a promising transducer material that combines high magnetostriction, desirable mechanical properties and a high permeability. The high permeability of this material causes a relatively low cutoff frequency in dynamic applications, above which eddy currents form and introduce significant powe…
New poly(1,4-phenylene ethynylenes)s (PPEs), in which each phenylene unit is substituted with both semifluoroalkoxy (−O(CH 2 ) m (CF 2 ) n F) and dodecyloxy (−O(CH 2 ) 12 H) groups, are amphiphilic by virtue of the self-aggregating properties of the dissimilar side chains. Sonogashira polymerization of 4-iodophenylace…
We analytically solve the problem of the reversible adsorption of Gaussian polymers onto the planar and spherical surfaces in the presence of the square well attractive potential. By making use of the obtained exact solution of the Edwards equation, we calculate the end density and surface excess of the polymers at th…
MgH2/Nb2O5 composite is one of the most promising candidates for the hydrogen delivery. The performances of these materials are usually improved by mechanical milling because a finer distribution of the catalyst and the induction of defects on the particles accelerate the hydrogen sorption kinetic of the powders. Aimi…
Abstract The effect of the temperature on the kinetics of vulcanization of natural rubber with the sulfur donor agent dipentamethylene thiuram tetrasulphide (DPTT) was investigated. The oscillatory disk rheometer and differential scanning calorimetry under dynamic and isothermal conditions were used. The Coran's model…
The complex [Fe{HC(3-Mepz)(2)(5-Mepz)}(2)](BF(4))(2) (pz = pyrazolyl ring) has been prepared by the reaction of HC(3-Mepz)(2)(5-Mepz) with Fe(BF(4))(2) x 6 H(2)O. The solid state structures obtained at 294 and 150 K show a distorted iron(II) octahedral N(6) coordination environment with the largest deviations arising…
Achieving nutrient pumping and strain stimulus by magnetic actuation of tubular scaffolds, Mack, Julia J, Cox, Brian N, Sudre, Olivier, Corrin, Abigail A, dos Santos e Lucato, Sergio L, Ma, Chelsea, Andrew, Jennifer S
Abstract This work focuses on the pressure dependence of some microstructure changes like the secondary crystallization induced by annealing above the glass transition temperature. Polyamide 11 samples were annealed under a hydrostatic argon pressure ranging from the ambient up to 4000 bars. Structural evolutions were…
This paper is focused on the characterization and modeling of a commercial Ni–Mn–Ga alloy for use as a dynamic deformation sensor. The flux density is experimentally determined as a function of cyclic strain loading at frequencies from 0.2 to 160 Hz. With increasing frequency, the stress versus strain response remains…
Composite materials based on shape memory alloys (SMA) have received growing attention over these last few years. In this paper, two particular morphologies of composites are studied. The first one is an SMA/elastomer composite in which a snake-like wire NiTi SMA is embedded into an elastomer ribbon. The second one is…