Materials Literature
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The dynamic structure factor $f(q,t)$ of suspensions of adhesive colloidal spheres has been characterized as a function of temperature over the volume fraction range $0.010<\ensuremath{\varphi}<0.075.$ Below a critical temperature that is volume fraction dependent, the suspensions underwent an abrupt, reversible…
on an Si substrate results in the formation of individual alumina nanotubes (ANTs). The picture shows an ANT with a length of 650 nm and internal and external diameters of 12 and 35 nm, respectively. Detailed studies by transmission electron microscopy revealed that the ANTs are completely detached cells of the porous…
Abstract The purpose of this article is to study the fast structural changes that take place during the deformation and heat setting of uniaxially preoriented poly(ethylene 2,6‐naphthalate) films. For this purpose, an online birefringence measurement system coupled with a heat‐setting oven was used. In the online bire…
Die Insertion einer Difluoroxymethylen-Brücke in die mesogene Kernstruktur einer auf Phenylcyclohexan basierenden Verbindung (siehe Bild) führt zu einer neuen Klasse von Flüssigkristallen, die eine überraschende und bislang beispiellose Verbesserung aller anwendungsrelevanten Eigenschaften aufweist. Eine neue Methode…
Abstract Oil palm fibers represent a very abundant and natural resource for raw materials that can be efficiently utilized as reinforcement in polymers. The sorption characteristics of two types of oil palm fibers—oil palm empty‐fruit‐bunch (OPEFB) fiber and oil palm mesocarp fiber‐in distilled water, mineral water, a…
We investigate the effect of anisotropy in grain boundary mobility on the dynamics, morphology, and topology of grain growth, using both analytical and numerical calculations on a generalized anisotropic phase field model. The dependence of the grain boundary mobility on both inclination and misorientation is included…
Details of the electronic and structural connections between macropolyhedral boranes and elemental boron are reported. The nature of electron deficiency in the beta-rhombohedral polymorph of boron is analyzed by using a molecular fragments approach with boranes as model systems. The B57H36 molecule constructed from su…
Insertion of a difluorooxymethylene bridge into the mesogenic core structure of phenylcyclohexane-based liquid crystals results in a class of materials that exhibits a surprising and unprecedented improvement of essentially all application-relevant properties. A novel synthetic procedure allows the convenient large-sc…
Abstract The plastic behavior of polyamide‐6 (or nylon‐6) films under uniaxial and biaxial tensile drawing is studied in relation to structural features. Quenched films in the mesomorphic β form are more ductile than films in the predominant stable α form. Films in the major γ crystalline form are intermediate between…
Edible films were prepared from solutions of soy protein with calcium salts and glucono-delta-lactone (GDL). Calcium salts cross-linking interactions with soy-protein isolate (SPI) could result in the formation of films with rigid three-dimensional structure. GDL contributed to the formation of a homogeneous film stru…
The hyperbolic geometry of the pores in SBA-15 are drawn into a three-dimensional structure by small lateral pores, distributed in a random way, as shown in the picture, which interconnect the main channels. This construction was established by forming a "negative" of the structure with platinum precipitated in the ch…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSol−Gel Synthesis of Free-Standing Ferroelectric Lead Zirconate Titanate NanoparticlesChao Liu, Bingsuo Zou, Adam J. Rondinone, and Z. John ZhangView Author Information School of Chemistry & Biochemistry Georgia Institute of Technology, Atlanta, Georgia 30332-0400 Cite…
Tetrathiafulvalen (TTF) und seine Derivate synthetisierte man ursprünglich als starke Elektronendonoren zur Entwicklung elektrisch leitender Materialien. In diesem Aufsatz liegt der Schwerpunkt auf neuen und teils nur wenig genutzten Anwendungsmöglichkeiten von TTF und seinen Derivaten, angefangen von der Molekülchemi…
A partial differential eigenvalue equation for the density displacement fields associated with electronic excitations is derived in the framework of density functional theory. Our quantum fluid-dynamical approach is based on a variational principle and the Kohn-Sham ground-state energy functional, using only the occup…
The complex conductivity of a MgB2 film has been investigated in the frequency range 4 cm^{-1}< nu < 30 cm^{-1} and for temperatures 2.7 K < T <300 K. The overall temperature dependence of both components of the complex conductivity is reminiscent of BCS-type behavior, although a detailed analysis reveals a number of…
The growth mechanisms of MgB2 films obtained by different methods on various substrates are compared via a detailed cross-sectional scanning electron microscopy (SEM) study. The analyzed films include (a) samples obtained by an ex-situ post-anneal at 900 degree of e-beam evaporated boron in the presence of an Mg vapor…
We report on a new class of magnetoresistance oscillations observed in a high-mobility two-dimensional electron gas (2DEG) in GaAs-Al$_x$Ga$_{1-x}$As heterostructures. Appearing in a weak magnetic field ($B<$ 0.3 T) and only in a narrow temperature range (2 K $
Fluorination of the hydrophobic core of a coiled-coil protein significantly improved its stability toward thermal and chemical denaturation. 5',5',5'-Trifluoroleucine (2) was efficiently incorporated into a leucine-zipper protein in place of leucine (1) during E. coli biosynthesis. The fluorinated variant maintained s…
The stability of the equilibrium configurations of a nematic liquid crystal confined between two coaxial cylinders is analysed when a radial electric field is applied and the flexoelectric effect is taken into account. The threshold for perturbations depending only on the radius r in the cylindrical coordinate system…
The effect of water exposure on MgB2 is studied by submerging an 800 nm thick MgB2 film into deionized water at room temperature for 1 hour, 4 hours, 10 hours, and 15 hours, and by analyzing the resulting material using scanning electron microscopy and resistance vs. temperature measurements. It is clearly observed th…