Materials Literature
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Abstract The surface sheet resistance of conducting films of glycerol‐doped poly(3,4‐ethylenedioxy‐thiophene)–poly(styrene sulfonate) is largely dependent on the annealing temperature. The presence of free glycerol in insufficiently baked films, as indicated by infrared spectra and thermogravimetric analysis, results…
At present, the discovery and development of phase change materials is mainly based upon empirical strategies and trial and error approaches. Here, we present a structural criterion that needs to be met to enable the mandatory fast recrystallization with sufficient optical contrast that characterizes suitable phase ch…
The epoxidation of allylic alcohols is shown to be efficiently and selectively catalyzed by the oxidatively resistant sandwich-type polyoxometalates, POMs, namely [WZnM(2)(ZnW(9)O(34))(2)](q)(-) [M = OV(IV), Mn(II), Ru(III), Fe(III), Pd(II), Pt(II), Zn(II); q = 10-12], with organic hydroperoxides as oxygen source. Con…
Well crystallized aligned zinc oxide nanoscale tubular structures have been fabricated via vapour phase growth on large area substrates. The ZnO nanotubes have regular polyhedral shapes, hollow cores with diameters of 30–100 nm, lengths over a few tens of micrometres and wall thicknesses of 4–10 nm. In morphology, the…
The comparative crystallisation and HRTEM imaging properties of simple binary halides formed by the alkali iodides MI (M = Li, K, Na, Rb and Cs) within single walled carbon nanotubes (SWNTs) are described. The most common structure type observed within SWNTs is the rocksalt archetype, although CsI was observed to form…
The surfactant-assisted seeded growth method was adapted for growth of gold nanorods directly on mica surfaces. Spherical gold seed particles were first linked to the surface and then dipped in a cationic surfactant growth solution. Part of the grown particles were nanorods with a typical length of several hundred nan…
We report on the observation of magnetoresistance in a Sr2FeMoO6 (SFMO)-based tunnel junction. This result is obtained by combining a three-step process for the growth of the Sr2FeMoO6 layer by pulsed laser deposition with a technology allowing the definition of nanometer-sized junctions. A clear positive magnetoresis…
A protocol to determine the absolute configuration of alpha-chiral carboxylic acids based on a modified circular dichroic (CD) exciton chirality method has been developed. The protocol relies on a host-guest complexation mechanism: the chiral substrates are derivatized to give bifunctional amide conjugates ("guests")…
We have studied the effects of relative mole ratios of the reactant precursors in the one-phase synthesis of alkaneselenoate- and alkanethiolate-functionalized gold nanoparticles. Specifically, we prepared a series of dodecaneselenoate (DDSe)- and dodecanethiolate (DDT)-functionalized gold nanoparticles using four dif…
Moderate-pressure techniques (P=2 GPa) have been used to prepare the complex LaCu3Mn4O12 perovskite. It has been characterized by neutron powder diffraction, magnetic, and magnetotransport measurements. This material is ferrimagnetic below TC=361 K. The magnetoresistance (MR) is enhanced with respect to that of CaCu3M…
Shape memory alloys (SMA), in particular nickel–titanium alloy (or nitinol), have been used as actuators in some astronautic, aeronautic and industrial applications. The future will see more SMA application if less energy is required for actuation. This paper presents the design and experimental results of control of…
Cobalt nanocrystals are produced in cobalt(II) bis(2-ethylhexyl)sulfosuccinate (Co(AOT) 2 ) reverse micelles. It is found that their size distribution is related to the volume of reducing agent added to the micellar system. At a low volume of reducing agent, the micelles play the role of nanoreactors in which take pla…
Studies on divalent-metal (M)-atom-doped XNM (X=Si, Ge, and Sn, N=8–12 and 14) clusters, using ab initio pseudopotential plane wave method, show that the well known nine- and ten-atom capped prism units as well as 12- and 14-atom clusters of these elements can transform to magic clusters with higher symmetries and lar…
The local structure of simple liquids is significantly different from that of corresponding crystalline systems. Signatures of fivefold local ordering have been previously found, but current knowledge is limited to pair distribution, leaving considerable uncertainty in the determination of the geometrical structure. N…
The adsorption and thermal desorption of CO 2 bound to both oxidized and reduced TiO 2 (110) surfaces has been studied using temperature-programmed desorption. For the stoichiometric and fully oxidized surface, a single thermal desorption feature ( E d = 48.5 kJ/mol) is measured and attributed to CO 2 bound to regular…
Aligned MoO3 nanowires have been grown on silicon substrates without using any catalyst. They were prepared in a two-step process: first by thermal evaporation and then further processed by oxidation. The MoO3 nanowires are of crystalline and have an orthorhombic structure. They also have high purity. Field-emission m…
The ultrafast photodynamics of porphyrin−fullerene dyads in which the distance between the porphyrin and C 60 moieties is varied systematically at close proximity has been examined using fluorescence up-conversion and pump−probe transient absorption techniques with time resolutions of ca. 100 fs. The porphyrin−fullere…
The experimental data on the thermal conductivity of ortho-parahydrogen solutions are analyzed on the basis of a relaxation-time model taking account of configurational relaxation of the ortho subsystem. The influence of configurational relaxation on the thermal conductivity is analyzed using resonance scattering of p…
We show that a class of negative index $(n)$ materials has interesting anisotropic optical properties, manifest in the effective refraction index that can be positive, negative, or purely imaginary under different incidence conditions. With dispersion taken into account, reflection at a planar negative-index interface…
We present an atomistic investigation of the influence of strain on the electronic properties of quantum dots (QD's) within the empirical $s p^{3} s^{*}$ tight-binding (ETB) model with interactions up to 2nd nearest neighbors and spin-orbit coupling. Results for the model system of capped pyramid-shaped InAs QD's in G…