Materials Literature
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We suggest theoretically the existence of a stoichiometric derivative of graphene, a two-dimensional analog of polyvinylidene fluoride, with fluorine and hydrogen atoms alternately attached to carbon atoms in a chairlike configuration. Analyzing the different possible decorations of H and F of graphene, we find that a…
Five bent-shaped molecules derived from the 1,3,4-oxadiazole core are synthesised and doped into chiral nematic liquid crystals to induce the blue phase. The effects of their terminal chain length on the blue phase range are compared and analysed experimentally. The results show that the blue phase range is significan…
We have fabricated optical metasurfaces on flexible substrates that show an optical response independent on the polarization and angles of incidence of light. The realized devices operate as ultrathin selective filters at visible frequencies, with a bandwidth of ∼200 nm, and their response is robust to membrane bendin…
We observed chiral charge order in the superconductor 2H-TaS 2 using scanning tunneling microscopy and spectroscopy at 0.1 K. Topographic images show hexagonal atomic lattice and charge density wave (CDW) with clockwise and counterclockwise charge modulations. Tunneling spectroscopy reveals the superconducting density…
Repeated precipitation of colloidal semiconductor quantum dots (QD) from a good solvent by adding a poor solvent leads to an increasing number of QD oligomers after redispersion in the good solvent. By using density gradient ultracentrifugation we have been able to separate QD monomer, dimer, and trimer fractions from…
Abstract Perfluoropolyether (PFPE) structures can be functionalized with acrylic groups using appropriate hydrogenated acrylic monomers: the macromers obtained are highly reactive under UV irradiation, and fluorinated polymers can be obtained. In the first part of this work is described the synthesis of new PFPE (meth…
Azobenzenes have attracted great interest in recent years because of their ability to change conformation upon irradiation. This property has been featured in several applications not only in organic chemistry but also in biology. Even though monoazobenzenes have been extensively studied and documented in the literatu…
SU-8 pillar-assisted epitaxial assembly of toric focal conic domains (TFCDs) arrays of smectic-A liquid crystals is studied. The 3D nature of the pillar array is crucial to confine and direct the formation of TFCDs on the top of each pillar and between neighboring pillars, leading to highly ordered square and hexagona…
A new method is described for the synthesis of exfoliated polymer nanocomposites made with modified graphite oxide (GO) using a miniemulsion polymerization technique. GO was synthesized and then modified with a reactive surfactant, 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), which widened the gap between the…
Complete sets of elastic, piezoelectric, and dielectric constants of 0.72Pb(Mg(1∕3)Nb(2∕3))O(3)-0.28PbTiO(3) single crystal poled along [111](c) (single domain) as well as non-polar axes [001](c) and [011](c) (multidomain) have been measured under natural conditions. These data allowed us to evaluate accurately the ex…
Colloidal quantum dots from cheap chemical synthesis are becoming important building blocks for constructing practical electronic devices. Here, we review some of the challenges and prospects of electronic doping of colloidal CdSe quantum dots. There are fundamental challenges to produce doped quantum dots with unifor…
Abstract The oxidation of NO, CO and hydrocarbons (HC) individually, in mixtures, and with NO 2 were investigated over a monolith‐supported Pt/Al 2 O 3 catalyst under oxidising conditions. Although competitive adsorption and inhibition by other species on oxidation reactions is a relatively well‐known phenomenon, this…
Copolymers are among the most promising substances used in the preparation of drug/gene delivery systems. Different categories of copolymers, including block copolymers, graft copolymers, star copolymers and crosslinked copolymers, are of interest in drug delivery. A variety of nanostructures, including polymeric mice…
Transformation optics is a design tool that connects the geometry of space and propagation of light. Invisibility cloaking is a corresponding benchmark example. Recent experiments at optical frequencies have demonstrated cloaking for the light amplitude only. In this Letter, we demonstrate far-field cloaking of the li…
Abstract Star‐shaped poly( ϵ ‐caprolactone)s are functionalized by various dienes (furan and anthracene) and a dienophile (maleimide), and the kinetics of network formation by melt‐blending is compared for both Diels–Alder adducts. When curing at 60 °C, the anthracene–maleimide network forms more rapidly and gives ris…
This work reports on the electronic and crystalline structure and the mechanical, magnetic, and transport properties of the polycrystalline Heusler compound Co${}_{2}$MnGe. The crystalline structure was examined in detail by extended x-ray absorption fine-structure spectroscopy and anomalous x-ray diffraction. The com…
We demonstrate coherent control of two nuclear spins mediated by the magnetic resonance of a hyperfine-coupled electron spin. This control is used to create a double-nuclear coherence in one of the two electron spin manifolds, starting from an initial thermal state, in direct analogy to the creation of an entangled (B…
Commonly observed variations in photoluminescence (PL) spectra of crystalline organic semiconductors, including the appearance or enhancement of certain PL bands, are shown to originate from a small amount of structural disorder (e.g., amorphous inclusions embedded in a crystal), rather than be necessarily related to…
Fe(III)-based coordination polymer nanoparticles (FeCPNPs) have been prepared for the first time by simple mixing of ferric chloride and sodium hexametaphosphate (SHAM) aqueous solutions at room temperature. It was found that such FeCPNPs possess peroxidase-like activity capable of catalyzing the oxidation of 3,3,5,5-…
Abstract Layer‐multiplying coextrusion was used in conjunction with isothermal recrystallization to study the confined crystallization of polyvinylidene fluoride (PVDF) and polyvinylidene fluoride‐tetrafluoroethylene (PVDF‐TFE) using polycarbonate (PC) and polysulfone (PSF) as confining materials. Three layered system…