Materials Literature
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Dynamic light scattering (DLS) measures time-dependent fluctuations in the scattering intensity arising from particles undergoing random Brownian motion. Diffusion coefficient and particle size information can be obtained from the analysis of these fluctuations. This paper discusses the factors which will influence th…
This review presents an overview of 1 → 2 branched dendrimers and dendrons, created by a divergent procedure, from their synthesis to modern day applications. The first members of this branched class of fractal macromolecules were prepared through a cascade synthesis, which was later replaced by the iterative divergen…
This paper extends the scope of semi-empirical bond constraint theory, (SEBCT) and uses this extension to provide quantitative insights into the atomic scale bonding interactions for the two transitions that bracket intermediate phases (IPs) in binary and ternary alloys. Reversibility windows have usually been defined…
Abstract A new phosphor, Cd 2 Ge 7 O 16 :Mn 2+ , which emits orange‐coloured long‐lasting phosphorescence upon UV light excitation, was prepared by the conventional high‐temperature solid‐state method and its luminescent properties were systematically investigated. X‐ray diffraction, photoluminescence and thermolumine…
A synchrotron x-ray diffraction study of the crystallographic structure of $\mathrm{Pr}{\mathrm{O}}_{2}$ in the Jahn-Teller distorted phase is reported. The distortion of the oxygen sublattice, which was previously ambiguous, is shown to be a chiral structure in which neighboring oxygen chains have opposite chiralitie…
The kinetic inertness of the hexaaquachromium(III) (kH2O=2.4x10(-6) s(-1)) has led to challenges with respect to incorporating CrIII ions into Prussian blue-type materials; however, hexakis(acetonitrile)chromium(III) was shown to be substantially more labile (approximately 10(4) times) and enables a new synthetic rout…
The Pr ions in $\mathrm{Pr}{\mathrm{O}}_{2}$ have a $4{f}^{1}$ configuration with a large orbital momentum and are placed in a strong crystalline field from the oxygen ions. Consequently, orbital effects dominate the magnetic properties of the system. At $120\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, there is a transitio…
Abstract Smectic‐A elastomers combine the positional long‐range order of mesogenic molecules in one dimension with the rubber elasticity of a polymer network. Upon mechanical deformation, completely different responses of the phase structure have been reported. We present a highly distorted system which shows a breakd…
The pair correlation function for Ge x Se 1− x alloys near the intermediate phase (IP) is reported. First-principles MD models of these alloys show a 'self-organized' phase associated with the number of Ge bonds with twofold Se atoms. This probably represents the IP of Boolchand. The self-organization involves maintai…
Kompositgarne: Ein biomimetischer Ansatz zur Synthese von hierarchisch strukturierten Siliciumoxidkompositfasern ist dem Prozess der Bioglasbildung nachempfunden. Die Fasern, die zur Bündelbildung neigen (siehe Bild), entstehen innerhalb von Sekunden durch Selbstorganisation von Peptid-Polymer-Nanobändern in Kombinati…
The intercalation of vanadium pentoxide by lithium ions leads to a change in optical properties, a process that is of value in thin-film electrochromic devices. In this study, films of V2O5, deposited on indium tin oxide (ITO) glass coupons by a sol-gel process, were challenged by increasing numbers of charge-discharg…
Abstract Summary : A series of ethylene homopolymers and ethylene/1‐hexene copolymers with different molecular weight distributions (MWD) and chemical composition distributions (CCD) was analyzed by crystallization analysis fractionation (Crystaf) at several cooling rates to investigate the effect of MWD, CCD, and coo…
The geometrical stability of the three lattices of the cubic crystal system, viz. face-centered cubic (fcc), body-centered cubic (bcc), and simple cubic (sc), consisting of bimodal discrete hard spheres, and the transition to amorphous packing is studied. First, the random close packing (rcp) fraction of binary mixtur…
The present study reports the dielectric study of a ferroelectric liquid crystal (FLC) material Felix 016/030 showing anomalous dielectric behavior. This anomalous behavior is explained on the basis of a model of dynamically fluctuating mixture of two interconvertible conformers, whose relative density changes with th…
In protein crystallization, post-translational modifications are often considered an annoyance. They are expected to introduce microheterogeneity into the protein and, in addition, in the case of the larger chemical modifications such as glycosylation, to increase surface entropy. On the one hand, these phenomena are…
We have used the aerodynamic levitation technique combined with CO 2 laser heating to study the structures of liquid CaAl 2 O 4 and MgAl 2 O 4 with x-ray and neutron diffraction. We determined the structure factors and corresponding pair correlation functions describing the short- and intermediate-range order in the l…
We describe a novel solution-based acoustic manipulation technique for the parallel alignment of carbon nanotubes on solid substrates. The acoustic radiation force and acoustic streaming, which are generated from the transmission of ultrasound through a fluid, facilitate the mobility of the nanotubes and result in the…
Abstract Summary: The incorporation of comonomer molecules in the backbone of a homopolymer can influence the final properties of the material, decreasing its crystallinity and the melting and glass transition temperatures, and increasing its impact resistance and transparency. In the present work, ten ethylene/propyl…
The light-induced controlled release of fragrances from photolabile 2-oxo-(2-phenyl)acetates via Norrish Type II photofragmentation was evaluated by irradiation of the precursors in different solvents and on cotton in a typical fabric softener application. The desired photooxidation was found to work efficiently in wa…
In the presence of Joule heating, the electronic temperature in a metallic resistor placed at sub-Kelvin temperatures can significantly exceed the phonon temperature. Electron cooling proceeds mainly through two processes: electronic diffusion to and from the connecting wires and electron-phonon coupling. The goal of…