Materials Literature
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For semicrystalline polymers there is an ongoing debate at what temperature the immobilized or rigid amorphous fraction (RAF) devitrifies (relaxes). The question if the polymer crystals aremelting first and simultaneously theRAFdevitrifies or the RAF devitrifies first and later on the crystals melt cannot be answered…
The texture of ultrafine-grained Al alloy AA6016 produced by accumulative roll bonding (ARB) has been measured by neutron diffraction. The starting texture consists of a strong cube component. During ARB, this texture breaks down and a texture typical for rolling of face-centered cubic metals with high stacking fault…
We investigate the hydrogen adsorbing characteristics of single-walled carbon nanotubes (CNTs) through fundamental molecular dynamics simulations that characterize the role of ambient pressure and temperature, the presence of surface charges on the CNTs, inclusion of metal ion interconnects, and nanocapillary effects.…
The insulator to metal transition in $\mathrm{La}\mathrm{Ti}{\mathrm{O}}_{3}$ induced by La substitution via Sr is studied within multiband exact diagonalization dynamical mean field theory at finite temperatures. It is shown that weak hole doping triggers a large interorbital charge transfer, with simultaneous electr…
It has become apparent through experimentation at the micro- and nanolevels that the crystalline defects known as dislocations have significant effects on a material’s properties. Accordingly, a complete material state description must include the characterization of the dislocated state. However, this characterizatio…
High purity in high yield L-lactide was prepared using a new purification method, and poly-L-lactide (PLLA) with ultra-high weight average molecular mass and narrow polydispersity index was synthesized by ring-opening polymerization. The effects of the purification method on the purity and yield of L-lactide were inve…
Lead sulfide nanocrystals (NCs) along with nanothreads and nanosheets were synthesized in the presence of water soluble polymers such as poly(styrene sulfonate) sodium salt (PSS) and poly(vinyl pyrolidone) (PVP) in aqueous phases at relatively mild temperature of 80 °C. The amount of each polyelectrolyte was systemati…
This work reports the successful use of a combination of non-conventional methods of synthesis (mechanosynthesis) and sintering (spark plasma sintering, SPS) for the preparation of nanostructured 0.92PbZn(1/3)Nb(2/3)O(3)-0.08PbTiO(3) (PZN-PT) ceramics. With this approach we achieve not only the stabilization of the PZ…
In this paper we report the preparation of ordered hexagonal 2D arrays of core/shell Cohcp/CoO nanocrystals. A full structural investigation has been carried out using high-resolution transmission electron microscopy, electron diffraction, and electron energy-loss spectroscopy.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTLiquid–Liquid Phase Separation and Crystallization in Thin Films of a Polyolefin BlendSong Hong†§, Xiaohua Zhang†, Ruoyu Zhang†§, Li Wang†, Jiang Zhao*†, and Charles C. Han*†View Author Information State Key Laboratory of Polymer Ph…
Many of the interesting mechanical and materials properties of the mollusk shell are thought to stem from the prismatic calcite crystal assemblies within this composite structure. It is now evident that proteins play a major role in the formation of these assemblies. Recently, a superfamily of seven conserved prismati…
Abstract Nylon 6/clay nanocomposites (NCNs) of different clay loadings are prepared by melt compounding. The effects of clay loading and dispersion on the thermal conductivity of NCNs are investigated using XRD, TEM, DSC, and POM. The results show that the thermal conductivity of the exfoliated NCNs decreases with an…
Abstract Conductive carbon‐black (CB)‐filled polyethylene composites were prepared after irradiation with a cobalt 60 source. The conductive composites were characterized by alternating‐current impedance spectroscopy, and the conductive mechanism of the conductive composites was analyzed in terms of a mathematical mod…
Topmost layers of amorphous ice undergo a structural transformation before the onset of crystallization and well before the premelting transitions. Ultralow-energy (∼1 eV) mass-selected Ar + scattering has been used to detect this structural change. The transformation is manifested in the form of drastic changes in th…
Abstract This article presents the results from a study on the cross‐plane water flow through the needle punched nonwoven geotextiles produced from polypropylene fibers. Different types of nonwoven geotextiles are produced by varying the processing parameters during the needle punching process. The pore characteristic…
A method is described for fabricating metallic colloidal doublets of gold-gold, silver-silver, and gold-silver. Individual gold and silver spheres of micrometer diameter were synthesized by the aggregation of nanoparticles. Then, by controlling aggregation using ionic strength, yields of doublets above 20% were obtain…
Keime verändern alles: Durch einen ungewöhnlich schnellen Kationenaustausch auf Nanometerebene gelingt es, die Keimbildung von Nanokristallen genau zu steuern. Als Modellsystem dienten 3.2–14 nm große PbSe-Nanokristalle, die über eine Keimbildungsreaktion von Pb2+ mit unbeständigen SnSe-Kernen gebildet werden (siehe B…
Indentation-induced deformation behaviour was characterized in nano-scale for bulk polycrystalline materials to understand strengthening factors of macroscopic properties especially for the grain boundary effect. Compared with deformation behaviour in the vicinity of single grain boundary and grain interior of an inte…
An anionic porphyrin, tetrakis(4-sulfonatophenyl)porphyrin (TPPS), was assembled into complex organized molecular films with an l -glutamic acid derivative ( l -GluC18) or octadecylamine (ODA) through in situ complex formation at the air/water interface. TPPS could form J-aggregates when deposited from the pH 3.1 subp…
Statistical distribution of the threshold voltage V th for more than 90 Pt/SrBi 2 Ta 2 O 9 /Hf–Al–O/Si ferroelectric-gate field-effect transistors (FeFETs) is reported for both p- and n-channel devices. The average memory window is nearly 1.2 V at the sweep voltage amplitude of 5 V (between −4 V and 6 V for the p - ch…