Materials Literature
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Abstract Even far above the glass transition temperature, the amorphous phase in semicrystalline polymers is known to be constrained by crystals and less mobile than a pure amorphous polymer close to its equilibrium rubbery state. The aim of this paper devoted to Polyamide 11 was to investigate the existence and signi…
We report the study of submonolayer growth of Ge(001) homoepitaxy by molecular beam epitaxy at low temperatures, $100--150\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$, using reflection high energy electron diffraction (RHEED) intensity oscillations obtained for a range of low incidence ang…
Nanoparticles such as inorganic fullerenes of metal dichalcogenides or carbon nanotubes have been recently used as lubricant additives and they present excellent tribological properties. Raman spectroscopy is a useful technique to follow modification of these two structures. We developed an original tribometer able to…
An amphoteric bio-compatible and stealth-like poly (amidoamine) named ISA23 was obtained from 2,2-bis(acrylamido)acetic acid (BAC) and 2-methylpiperazine. The partial substitution of 4-amino-2,2,6,6-tetramethylpiperidin-1-oxyl (Amino-TEMPO) for 2-methylpiperazine as co-monomer gave two new PAA-TEMPO conjugates based o…
Silica-poly(acrylic acid) (PAAc) core–shell nanoparticles (NPs) were successfully prepared via graft copolymerization of acrylic acid (AAc) onto vinyl-bond-modified silica NPs. Transmission electron microscopy (TEM) results indicated that the obtained micropheres have a core–shell morphology. Fourier transform infrare…
Ferromagnetic Bi–Cu codoped ZnO nanowires were fabricated at temperatures as low as 300°C via a vapor phase transport using the mixture of Zn, BiI3 and CuI powders. They are grown as a bicrystal, along the [011¯2] direction, have a width of 40–150nm, and a length of a few microns. The investigation of the growth mecha…
We electron-dope single crystal samples of SrTiO3 by exposing them to Ar+ irradiation and observe carrier mobility similar in its magnitude and temperature dependence to the carrier mobility in other electron-doped SrTiO3 systems. We find that some transport properties are time dependent. In particular, the sheet resi…
A method based on the thermal equilibrium theory of crystal defects for estimating the Mn4+ ion content ratio (RM4) at B sites in ABO3 self-doped manganite La1−xMnO3−δ is presented. For this kind of manganite, the relationship between the Curie temperature (TC) and RM4 can be explained by the double exchange mechanism…
Abstract Small‐angle X‐ray scattering (SAXS) studies of electrically conductive blends based on polyaniline–dodecylbenzenesulfonic acid (PANI–DBSA)/styrene–butadiene–styrene (SBS) triblock copolymer were performed to investigate the influence of the blend preparation procedure on the nanoscopic structure of the blends…
We demonstrate light-induced formation of semiconductor quantum dots in TOPAS® polymer matrix with very high control of their size and their spatial localization. Irradiation with UV laser pulses of polymer films embedding Cd thiolate precursors results in the formation of cadmium sulfide nanocrystals well confined in…
Ultrathin TaSiC amorphous films prepared by magnetron cosputtering using TaSi2 and C targets on Si(100), in a sandwiched scheme Si(100)∕TaSiC(5nm)∕Cu, were evaluated for barrier performance in copper metallization. Optimizing carbon content maximizes thermal stability of the films as depicted by sheet-resistance, x-ra…
In this paper, we demonstrate reversible resistance switching in a capacitorlike cell using a Ge–Sb–Te film that does not rely on amorphous-crystalline phase change. The polarity of the applied electric field switches the cell resistance between lower- and higher-resistance states, as was observed in current-voltage c…
A very efficient energy transfer from Ce3+ to Er3+ in yttrium aluminum garnet (YAG) matrix is observed. The transfer gives about 1000 times enhancement to the Er3+ 1540nm emission. This is due to efficient absorption by the allowed 4f-5d transition of Ce3+ ions then transfer to Er3+ ions via a matched energy level F9∕…
A physically based one-dimensional shape memory alloy (SMA) model is implemented into the finite element software ABAQUS via a user interface. Linearization of the SMA constitutive law together with complete transformation kinetics is performed and tabulated for implementation. Robust rules for transformation zones of…
Facile synthetic routes have been developed that provide access to cationic and anionic water-soluble polyferrocenylsilane (PFS) polyelectrolytes with controlled molecular weight and narrow polydispersity. Living photolytic ring-opening polymerization of amino-functionalized [1]ferrocenophane (fc) monomers [fcSiMe{C[t…
A one-dimensional coupled thermomechanical model is presented for shape memory alloys (SMAs) under non quasi-static loading by defining a Helmholtz free-energy function consisting of strain energy, thermal energy, and the energy of phase transformation. The first law of thermodynamics is used to address the thermomech…
The stable culture of myogenic cells and their differentiation into myotubes in vitro is often hindered by the mechanical destabilisation of the spontaneously contractile neotissue formed, resulting in the complete loss of differentiating myotubes. Electrospun, parallel aligned nylon 6/6 microfibre arrays were use suc…
A first-principles-based scheme is used to investigate the thickness dependency of domain width of 180° stripe domains in Pb(Zr,Ti)O3 ultrathin films. Our study shows that (1) more metastable states with energy closer to the 180° stripe domain ground state occur in thicker films, (2) the Kittel law is valid for 180° s…
Changes in pressure and magnetic field in the orbital and magnetic ordering temperatures of RVO3 perovskites are reported; they reveal a competition between two magnetic orbitally ordered phases that have opposite preferences for the e-orbital component in the localized {3}T{1g} ground state of the V(3+) ion. This com…
Triple junctions constitute a significant volume fraction of bulk nanocrystalline metals, in which disclinations are typical junction defects. In this study, a disclinated tricrystalline nickel nanowire with three [001] tilt grain boundaries intersecting at 120\ifmmode^\circ\else\textdegree\fi{} angles is simulated at…