Materials Literature
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Nanostructured, heterogeneous, chiral Diels−Alder catalysts that are entirely organic in nature were prepared by synthesizing a polymerizable chiral imidazolidinone derivative (1). Acidification of 1 simultaneously activates the catalyst and allows the molecule to form different lyotropic liquid crystal phases. Subseq…
An axiperiodic quasistatic model to evaluate the magnetic flux density distribution and power loss due to curvature-related radial flux in the laminated core of axial flux machines is presented. It is shown that the relatively low effective permeability in the radial direction and the shielding effect of induced eddy…
The theme of this paper is the design of portable electronic systems for hot and humid conditions. In particular, portable products such as mobile phones. CD players and digital cameras can experience high relative humidity and condensation. It is important to understand the behaviour of portable products in different…
Abstract The variation of air holdup and stability of colloidal gas aphrons (CGAs) with stirring time, surfactant concentration [6, 8.1, 10, and 12 mM sodium lauryl sulfate (SLS)], and stirring speed (3500–7000 rpm) was investigated, and an empirical correlation between the air holdup and stirring time was obtained. A…
We performed ab initio electronic structure calculations to study the stability of the Slater and Takagi protonic defects in the ferroelectric phase of ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4}$. We show that the Slater defects are stabilized only when they are aligned forming chains of defects in the lattice, in accordance…
Abstract The free‐radical copolymerization of N ‐phenylmaleimide ( N ‐PhMI) with acrylic acid was studied in the range of 25–75 mol % in the feed. The interactions of these copolymers with Cu(II) and Co(II) ions were investigated as a function of the pH and copolymer composition by the use of the ultrafiltration techn…
Using numerical simulations we study the pinning and dynamics of interacting colloids on periodic one-dimensional substrates. As a function of colloid density, temperature, and substrate strength, we find a variety of pinned and dynamic states including a locked smectic, pinned buckled, two-phase flow, and moving part…
Hydrogen bonding effects on surface structure, photophysical properties, and photoelectrochemistry have been examined in a mixed film of porphyrin and fullerene composites with and without hydrogen bonding on indium tin oxide and nanostructured SnO2 electrodes. The nanostructured SnO2 electrodes modified with the mixe…
Changes in the UV-vis spectra and induced circular dichroism (ICD) signals observed, in correspondence with the porphyrin Soret region, for aqueous solutions of achiral 5,10,15,20-tetrakis{p-[omega-methoxy poly(oxy-ethylene)]phenyl}porphyrin cobalt (II) (Co-P) and aromatic alpha-L-amino acids (Trp and Phe) give direct…
The preparation of mesoporous tungsten trioxide from tungstic acid and tungstic hexaethoxide precursors containing an added organic stabiliser via a sol–gel method is reported. The effect of annealing temperature and precursor species on the photoelectrochemical performance and the electrochromic colouration efficienc…
A theory for the size dependence of the coefficient of thermal expansion (CTE) of nanostructures is developed. The theory predicts that the fractional change in the CTE from the bulk value scales inversely with the size of the nanostructure. An explicit relation for the intrinsic length scale that governs the size dep…
We have investigated the third-order optical nonlinearity of poly(3-hexylthiophenes) with various head-to-tail coupling ratios (r), using the third-harmonic generation method. An increase in r leads to a reduction in optical gap energy (Eg) and an increase in the third-order nonlinear susceptibility (χ(3)). For r=0 to…
In order to further elucidate the local structure of vanadate glasses, x-ray photoelectron spectroscopy (XPS) and magnetization studies are reported on a series of SrO-vanadate and SrO-borovanadate glasses: $[{(\mathrm{Sr}\mathrm{O})}_{x}{({\mathrm{V}}_{2}{\mathrm{O}}_{5})}_{1\ensuremath{-}x}]$, $[{(\mathrm{Sr}\mathrm…
The propagation of heat pulses in single-wall carbon nanotubes has been investigated using molecular dynamics simulations. It is found that heat pulses of picosecond duration in (10,0), (7,0), and (5,5) single-wall carbon nanotubes induce several wave packets that propagate at different propagation speeds. The leading…
This article deals with anionic ring-opening polymerization of a bifunctional cyclic carbonate consisting of both five- and six-membered rings (65CCP) and anionic depolymerization of the obtained polymer. Anionic ring-opening polymerization of 65CCP initiated with 1,8-diazabicyclo[5.4.0]-7-undecene (DBU) afforded a po…
Experimental cloud-point data for poly(ε-caprolactone) in supercritical CO 2, CHClF 2, dimethyl ether(DME), 1-butene, and propylene at high pressure were measured at temperatures from 40 to 230 °C and pressures up to 2 830 bar. Poly(ε-caprolactone) was dissolved well in DME and CHClF 2 below 500 bar and in CO 2, 1-but…
Density functional theory (DFT) computations have been carried out to study the structure and stability of MoSx clusters with the change of sulfur coverage at both Mo and S edges. DFT shows that adding sulfur to the Mo edge is always exothermic. However, deleting corner sulfur from the S edge is exothermic for 67 and…
The molecular chain reorganization in freely standing membranes with encapsulated gold nanoparticles was studied with surface enhanced Raman scattering (SERS) in the course of their elastic deformations. The efficient SERS was enabled by optimizing the design of gold nanoparticle forming chainlike aggregates, thus cre…
Powder neutron diffraction analysis on $^{11}\mathrm{B}$-enriched samples of ${\mathrm{Li}}_{2}{\mathrm{Pd}}_{3}\mathrm{B}$ and ${\mathrm{Li}}_{2}{\mathrm{Pt}}_{3}\mathrm{B}$ confirms the stability, down to liquid helium temperatures, of their antiperovskite structure (space group $P{4}_{3}32$). The low-temperature no…
Alkylation of nanotube salts prepared using either lithium, sodium, or potassium in liquid ammonia yields sidewall-functionalized nanotubes that are soluble in organic solvents. Atomic force microscopy and transmission electron microscopy studies of dodecylated SWNTs prepared from HiPco nanotubes and 1-iodododecane sh…