Materials Literature
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Abstract The relationship between the structure and the optical properties of isotactic polypropylene (PP) containing 1,3:2,4‐di‐ p ‐methylbenzylidene sorbitol (MDBS) has been studied. It is found that thinner injection‐molded plaques of PP/MDBS show higher levels of transparency than compression‐molded plaques. The e…
Spin Hamiltonian parameters for a ferromagnetically coupled dinuclear Ni(II) complex [Ni 2 (en) 4 Cl 2 ]Cl 2: J = +9.66 cm -1, g = 2.242, D A = −4.78 cm -1, D AB = −0.64 cm -1 and zj = −0.402 cm -1 were reliably determined from a powder sample by simultaneously fitting them to magnetic data and tunable-frequency high-…
A crystalline triply bridged molecular gyroscope has been prepared and analyzed by single-crystal X-ray diffraction. A convergent synthetic strategy was developed to control the direction of the three bridges, from the preferred two zonal and one meridional arrangement of a one-step cylclization process to the directe…
The effect of LiBH 4 on the hydrogen sorption performance of magnesium was investigated. It was found that the hydrogen storage properties of LiBH 4 /Mg mixtures exhibit a dramatic improvement as compared to plain magnesium powder. For example, at 250 °C, a LiBH 4 /Mg (mass ratio 1:4) composite can absorb 6.7 wt % hyd…
Taking into account the constraints imposed by the lattice symmetry, we calculate the phonon dispersion for graphene with interactions between the first and second nearest neighbors. We show that only five force constants give a very good fitting to the elastic constants and phonon frequencies observed in graphite.
The use of intelligent materials reacting to external stimuli is rapidly growing in the field of technical textiles. In this paper, the processing of conductive yarns for the development of smart textiles is discussed. Two different methods are exposed: the coating of textile yarns using conductive polymers, and the b…
Recent advances in shape memory alloys (SMAs) and shape memory polymers (SMPs) have inspired researchers to create intelligent textiles as self-regulating shape-changing structures responding to environmental variation, contributing to a new field in the scientific frontier of smart materials. This paper shows how app…
An analysis of the valence and conduction band electronic structure of TiO2 as studied by ultraviolet photoemission spectroscopy (UPS) and x-ray absorption spectroscopy (XAS) using synchrotron radiation is reported. Valence band spectra from UPS have been deconvolved using a five-peak model. The spectra are interprete…
Samples of novel nanocomposites of multiwalled carbon nanotube and poly (dimethylsiloxane), i.e., CNT-PDMS, at different filler concentrations are prepared. The mechanical/electrical and piezoresistance properties of these nanomaterials are studied in detail. The Gauge Factor (GF) of this nanocomposite, dependent on t…
Heterospin complexes [Cu(SQ)2Py].C7H8, Cu(SQ)2DABCO, and [Cu(SQ)2NIT-mPy].C6H6, where Cu(SQ)2 is bis(3,6-di-tert-butyl-o-benzosemiquinonato)copper(II), DABCO is 1,4-diazabicyclo(2,2,2)octane, and NIT-mPy is the nitronyl nitroxide 2-(pyridin-3-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl, have been s…
This work presents a method to measure the thermal conductivity and heat capacity of electrically conducting small-volume liquid samples using the 3omega technique. A mathematical model of heat transfer is derived to determine the thermal properties from the 3omega signal considering the device geometry. In order to v…
Iron losses in permanent-magnet synchronous machines form a larger portion of the total losses than in induction machines and, hence, more importance should be given to the iron losses. Previously, models have been presented for the calculations of these losses, but these models still rely on finite-element simulation…
Extended abstract of a paper presented at Microscopy and Microanalysis 2007 in Ft. Lauderdale, Florida, USA, August 5 – August 9, 2007
Linear low‐density polyethylene (LLDPE)/multiwalled carbon nanotube (MWNT) nanocomposites were prepared via melt blending. The morphology and degree of dispersion of nanotubes in the polyethylene matrix were investigated using scanning electron microscopy (SEM). Both individual and agglomerates of MWNTs were evident.…
Gold sponges consisting of bicontinuous, 3D networks of branched nanowires and tortuous pores are prepared by anodic dissolution of silver from Ag 75 Au 25 alloy sheets in 1 mol L -1 HClO 4, an electrochemical process occurring under mixed charge transfer and mass transport control. Samples resulting from dissolution…
Stimulated by the experimental synthesis of BN and AlN nanotubes, there has been considerable interest in nanotubes by noncarbon elements. Our density functional calculations show that the graphitic planar structure of ZnO is relatively stable and experimentally accessible. The single-walled nanotubes of ZnO have smal…
Abstract There has been limited research on clay mineral transformation in serpentinitic soils under humid tropical conditions. In this study, four soil pedons were selected along a toposequence from the summit (Entisol), shoulder (Vertisol), backslope (Alfisol) to footslope (Ultisol) positions to explore the contribu…
Surface-enhanced Raman (SERS) spectra of various batches of bacteria adsorbed on silver colloidal nanoparticles were collected to explore the potential of the SERS technique for rapid and routine identification of E. coli and L. monocytogenes cultures. Relative standard deviation (RSD) of SERS spectra from silver coll…
Cysteine and toluene as model organic molecules were intercalated into Fe-rich smectite (nontronite, NAu-2). The illitization of these intercalated smectites as induced by microbial reduction of structural Fe 3+ was investigated. Iron-reducing bacterium Shewanella putrefaciens CN32 was incubated with lactate as the so…
Abstract Solid‐solid phase transitions of the CL‐20 polymorphs ε→γ, α→γ, and β→γ were studied isothermally at ambient pressure by transmission FT‐IR spectroscopy and analyzed by multivariate regression. Activation energies as function of the extent of conversion were obtained using the model‐free isoconversional metho…