Materials Literature
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The independence of the dynamic conductivity of intrinsic graphene of frequency takes its origin in the compensation of the vanishing density of states by the diverging matrix element of the corresponding interband transition. The applicability of the linear response approach, however, breaks down when this matrix ele…
Abstract A supramolecular engineering approach has been developed for a novel family of N ‐salicylidene aniline derivatives to control their thermo‐ and photochromic behaviours. Hsaltrz, Habs, Hsalphen, Hsaltz and Ksaltz are versatile molecules built from N‐heterocycles, which drive the molecular arrangement to form a…
PURPOSE: A physics-based model of a general magnetic drug targeting (MDT) system was developed with the goal of realizing the practical limitations of MDT when electromagnets are the source of the magnetic field. METHODS: The simulation tracks magnetic particles subject to gravity, drag force, magnetic force, and hydr…
In this study, we investigated the electrospinning process of sodium alginate-pectin fibers intended to be used as a carrier for stabilizing folic acid. Fiber-forming solutions containing 0.01% (w/w) folic acid were prepared by blending low- or medium-viscosity sodium alginate with pectin in a 70 : 30 ratio to form LS…
The hydrogen storage properties of nanoporous Pd fabricated by dealloying a Pd 0.2 Co 0.8 alloy were investigated by measuring pressure−composition isotherms (PCTs). The hydrogen storage behaviors of nanoporous Pd were obviously different from those of bulk Pd and other nanostructured Pd materials, such as nanocrystal…
Two alternative oxygen electrodes (anodes), La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) and La 0.8 Sr 0.2 MnO 3−δ (lanthanum strontium manganite)/YSZ (yttria stabilized zirconia), were tested in 10Sc1CeSZ (scandia and ceria stabilized zirconia) based electrolysis cells and electrochemically evaluated. In all the samples,…
The current transport across the graphene/$4H\text{-SiC}$ interface has been investigated with nanometric lateral resolution by scanning current spectroscopy on both epitaxial graphene (EG) grown on (0001) $4H\text{-SiC}$ and graphene exfoliated from highly oriented pyrolytic graphite deposited on the same substrate […
Graphene oxide (GO) is a promising precursor for the mass production of graphene. As an important step in this direction, the electrical conductivity of GO has been enhanced by six orders of magnitude, thus closely approaching that of exfoliated graphene. The novel two-step process reported by Cristina Gómez-Navarro a…
Yolk-shell catalysts have attracted interest in both academia and industry, since they combine high-temperature stability with a reduced complexity for kinetic and mechanistic investigations. This contribution presents a possibility to adjust the size of an active gold core inside a porous zirconia shell via an ex-pos…
According to a new design strategy for "de Vries-like" liquid crystal materials, which are characterized by a maximum layer contraction of < or = 1% upon transition from the SmA phase to the SmC phase, we report the synthesis and characterization of two homologous series of organosiloxane mesogens. The design of these…
Ask the locals: Dynamic deformation of the dicopper tetracarboxylate paddlewheel unit within a metal–organic framework from square-prismatic (see picture, left) to distorted (right) occurs at very low energies. This deformation, which contributes strongly to the negative thermal expansion of this system, is a local vi…
The photocytotoxicity of a series of anticancer trans-dihydroxido [Pt(N(3))(2)(OH)(2)(NH(3))(X)] (X = alkyl or aryl amine) platinum(IV) diazido complexes has been examined, and the influence of cis-trans isomerism has been investigated. A series of photoactivatable Pt(IV)-azido complexes has been synthesized: The synt…
We recently found that crystallization of monodisperse hard spheres from the bulk fluid faces a much higher free-energy barrier in four than in three dimensions at equivalent supersaturation, due to the increased geometrical frustration between the simplex-based fluid order and the crystal [J. A. van Meel, D. Frenkel,…
An asymmetric single hollow structure was generated from Ag-Au-Ag heterometal nanorods by a partial galvanic replacement reaction for the first time. The C(2)-symmetry breaking took place because of the random generation of a single pit on only one end of the silver domain at an early stage of the reaction. Careful co…
Pepsin-solubilized collagen (PSC) was extracted from giant red sea cucumbers ( Parastichopus californicus ) and characterized for denaturation temperature (T(d)), maximum transition temperature (T(m)), enzyme-digested peptide maps, and gel-forming capability. SDS-PAGE showed that PSCs from giant red sea cucumber skin…
Polarization dependent Raman scattering experiments realized on single GaAs nanowires with different percentages of zinc-blende and wurtzite structure are presented. The selection rules for the special case of nanowires are found and discussed. In the case of zinc-blende, the transversal optical mode E1(TO) at 267 cm-…
We provide an expression quantitatively describing the specific heat of the Ising model on the simple-cubic lattice in the critical region. This expression is based on finite-size scaling of numerical results obtained by means of a Monte Carlo method. It agrees satisfactorily with series expansions and with a set of e…
Beta-lactam antibiotics inhibit penicillin binding proteins (PBPs) involved in peptidoglycan synthesis. Although inhibition of peptidoglycan biosynthesis is generally thought to induce cell lysis, the pattern and mechanism of cell lysis can vary substantially. Beta-lactams that inhibit FtsI, the only division specific…
Submicron-sized sterically-stabilized lightly cross-linked poly(2-vinylpyridine) latexes were synthesized by non-aqueous dispersion polymerization using a hydrophobic polydimethylsiloxane macromonomer and used to prepare millimetre-sized ‘liquid marbles’. These ‘liquid marbles’ exhibited long-term stability when trans…
In the framework of the modern theory of polarization, we rigorously establish the microscopic nature of the electric displacement field $\mathbf{D}$. In particular, we show that the longitudinal component of $\mathbf{D}$ is preserved at a coherent and insulating interface. To motivate and elucidate our derivation, we…