Materials Literature
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The complex dielectric properties of CoTiO 3 ceramics were investigated as functions of temperature (130 K ≤ T ≤ 430 K) and frequency (100 Hz ≤ f ≤ 100 kHz). Two thermally activated dielectric relaxations were observed. TiO 2 addition and annealing treatments were used to modify the behaviour of these relaxations. It…
Combined field ion and electron microscopy and mass spectrometry have revealed the presence of linear carbon chains at the surface of sharpened carbon fibers treated by electric fields of the order of 1011 Vm amp; 8722;1. Linear chains attached to carbon tips consisting of more than ten atoms can be produced in situ i…
Abstract Single crystal growth experiments were conducted to investigate the growth rate of acetaminophen (paracetamol) crystals under carefully controlled conditions of temperature, supersaturation and pH value. The relative growth rate of the different faces was studied. Growth Rate Dispersion (GRD) was observed by…
The diffusion process of a single spherical nanoparticle immersed in a fluid solvent is studied by molecular dynamics simulations. When the nanoparticle mass stays constant, it is shown that, at short times, the decay of the nanoparticle velocity autocorrelation function is strongly modified when the particle diameter…
ZnS nanotetrapods have been synthesized through the direct reaction of Zn with S via a thermal evaporation method in Ar at 800 °C without catalyst. Studies on the microstructures give experimental evidence for the growth mechanism of ZnS nanotetrapods. A zinc blende (ZB) ZnS core nucleates in the first stage during th…
Measured values of the three-phase line tension in the literature are correlated with the spreading parameter and with the radii of the drops or bubbles under investigation. The latter dependence contradicts an assumption of the modified Young equation. We suggest an alternative empirical formulation that describes th…
The first polyoxometal complex possessing affirmatory mixed molybdenum-tungsten capped Keggin-type structure has been hydrothermally synthesized.
The purpose of this paper is to investigate experimentally the shift of the eutectoid point in the Fe–C binary system when applying a high magnetic field. The eutectoid carbon content is observed to shift from 0.77 wt% to 0.83 wt% under a 12 T magnetic field. A practical and complete calculation method is proposed—on…
For many emerging applications, nanocrystals are surface functionalized with polymers to control self-assembly, prevent aggregation, and promote incorporation into polymer matrices and biological systems. The hydrodynamic diameter of these nanoparticle–polymer complexes is a critical factor for many applications, and…
Four ceramic powders were produced using the glycine–nitrate process: lanthanum‐doped barium cobaltite, ceria, magnesia, and strontium‐doped lanthanum chromite (LSC). Glycine‐to‐nitrate ratios from 0.25 to 1 were investigated. During the combustion synthesis process, careful collection of process off‐gas was followed…
We show that single-walled carbon nanotube (SWNT) bundles emit visible fluorescence in the presence of noble metal nanoparticles and nanorods in the solid state. Conductivity measurements with metallic nanotubes, isolated from pristine SWNTs, show that they become semiconducting in the presence of the metal nanopartic…
Abstract A series of donor–π–acceptor systems incorporating a tetrathiafulvalene moiety as the donating unit have been designed and synthesized. The efficiency of the imine (–C=N–) bond as a conjugated π‐linker in promoting intramolecular charge transfer is demonstrated and supported by calculations at the B3LYP/6‐31G…
Colloidal ZnGa2O4 nanocrystals with a mean size of about 7 nm were successfully synthesized by using a non-aqueous sol–gel method.The nanocrystals can easily be dispersed in chloroform to form stable colloids without the use of any additional stabilizers. Strong blue fluorescence was observed from the clear colloidal…
In this paper, we present a new numerical formulation that we have applied to the model for bipolar charge transport, trapping and recombination in polymeric insulators, such as low density polyethylene. The numerical model is based on the high precision Runge–Kutta method for determining mobile and trapped charge loc…
The hydrolytic and enzymatic degradation behavior of poly(epsilon-caprolactone) (PCL) is investigated using the Langmuir monolayer technique, and an improved data acquisition and data reduction procedure is presented. Hydrolytic and enzymatic monolayer degradation experiments of PCL with various molecular weights by P…
It is shown that all the known experimental (quasi)stationary dielectric response functions of glassy media can be derived from a standard generalized Langevin description of overdamped torsional dipole oscillators in trapping potentials with random orientations under some minimal assumptions. The non-Markovian theory…
This work describes the dilute solution and solid-state structure of polyelectrolyte complexes generated from hyperbranched polylysine (HBPL) and various anionic, sodium alkyl sulfate surfactants. In dilute solution, the radius of gyration ( R g ) of the HBPL and HBPL−surfactant complexes was determined in the Guinier…
Abstract Good quality single crystals of Ni 2+ , Co 2+ ions doped Bisthiourea Cadmium Chloride (BTCC) are some of the excellent and efficient non‐linear optical materials grown from aqueous solution by slow evaporation method. The lattice parameters of the grown crystals are determined by single crystal X‐ray analysis…
Cationic cellulosic polymers find wide utility as benefit agents in shampoo. Deposition of these polymers onto hair has been shown to mend split-ends, improve appearance and wet combing, as well as provide controlled delivery of insoluble actives. The deposition is thought to be enhanced by the formation of a polymer/…
Single crystals of ammonium lead iodide, NH 4 PbI 3 , have been obtained by solid-state reactions. Each Pb II ion is coordinated by six I − ions in a distorted octahedral environment. PbI 6 octahedra are connected by common edges, forming a one-dimensional anion chain. All atoms except one H atom in a general position…