Materials Literature
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Effects of compressive stress on the dielectric and ferroelectric properties of commercial soft PZT ceramics were investigated. The dielectric and ferroelectric properties were measured under compressive stress applied parallel and perpendicular to an electric field direction. The results showed that the dielectric pr…
SrTiO3 exhibits unusually complex ground states which reach from insulating quantum paraelectric to poor metallic behavior depending on doping and/or oxygen stoichiometry where superconductivity might appear. Upon Nb doping two-gap superconductivity is induced and with this the first two-gap superconductor realized lo…
Abstract Vibrational spectra of rhombohedral TeO 3 (r‐TeO 3 ) are analyzed along with those of ReO 3 ‐like proto‐phase (c‐TeO 3 ) and α‐TeO 2 (paratellurite), emphasizing their lattice dynamic and crystal chemistry aspects. It is shown that (1) r‐TeO 3 can be regarded as resulting from the condensation of a particular…
Abstract The graphite films of nanometer thickness were produced by condensation of carbon from gaseous phase onto polycrystalline nickel. The films have wrinkled surface with the atomically flat regions separated by the ridges. Together with a net of randomly oriented ridges the periodically ordered wrinkles have bee…
Abstract We studied the effect of pressure on the electronic properties of bundled single‐walled carbon nanotubes by infrared transmission measurements. Different pressure transmitting media were employed to verify their influence on the observed pressure dependence. A redshift of the optical absorption bands is obser…
137Ba NMR spectroscopy is very suitable to study size effects in very fine particles of barium titanate. The particle sizes varied between 155 and 15 nm. The NMR measurements were carried out within a temperature range of 295 to 420 K covering also the cubic to tetragonal phase transition at TC . Below TC the NMR line…
With ever-increasing need for thin, flexible, and functional materials in electrochemical systems, various techniques have been explored for creating materials used in fuel cells, batteries, electrochromic devices, solar cells, and sensors. In the present study, a novel ferrocene (Fc) and cholesterol (Chol)-containing…
The nonlinear magnetoelectric effect in a relaxor ferroelectric, which is randomly diluted by a (ferro)magnetic compound, is investigated on the basis of a phenomenological Landau-type free energy model. It is assumed that macroscopic electrostrictive and magnetostrictive deformations give rise to fourth-order magneto…
The dumbbell (DB) ZnO bipod crystal is directly grown from acetate anion intercalated Zn based hydroxyl double salts (Zn-HDS). Our results suggest that the (0001)-to-(0001) plane orientation of the DB ZnO crystal comes from the acetate anions intercalated into the Zn-HDS. The DB ZnO crystal is dynamically changed to t…
Abstract The Poisson's ratio effect of single wall carbon nanotube heterojunctions (HJ) of the type (5,5)–(10,10) is investigated using an hybrid finite element atomistic‐continuum approach to simulate the mechanical behaviour of nanostructures. The nanotube HJs provide a peculiar deformation pattern, with combined be…
The existing situation in prospects of application of electrocaloric effect (ECE), related to finding ferroelectrics exhibiting high values of ECE, is discussed. Besides 1st order ferroelectric-paraelectric phase transitions, which were most promising till recent time with respect to high values of ECE, there are othe…
OBJECTIVES: We aimed to develop a directly detected magnetic resonance imaging (MRI) contrast agent for use with high fields based on a nanoscale fluorinated dendrimer-based platform for F MRI and overcome some of the problems with F MRI. MATERIALS AND METHODS: The dendrimers were prepared in a convergent manner by ma…
Localized surface plasmons of metallic nanoparticles can strongly amplify the magnitude of the surrounding electric field. This in turn enhances fluorescence from nearby fluorophores. However, little is known regarding how time-dependent changes in nanoparticle structure due to exposure to the ambient environment affe…
In order to have access to chiral gels, a series of salts derived from (1R,3S)-(+)-camphoric acid and various secondary amines were prepared based on supramolecular synthon rationale. Out of seven salts prepared, two showed moderate gelation abilities. The gels were characterized by differential scanning calorimetry,…
Low concentrations (0.1−1% of the Zn concentration) of Sb ions in an alkaline ZnO chemical bath deposition solution were found to lead to pronounced changes in the ZnO film morphology. The tapered nanorods obtained in the absence of Sb become flat-topped and more closely packed when Sb is present, and the nanorod diam…
Abstract With Lewis Acids as catalysts in melt system, the influence of kinds of Lewis Acids, dosages of catalysts on the behaviors of crosslinking and grafting of ethylene–propylene–diene rubber (EPDM) were investigated. The Lewis Acids, such as anhydrous AlCl 3 , FeCl 3 , SnCl 4 , could initiate the crosslinking of…
We report the results of dynamic light scattering measurements of the coherent intermediate scattering function (ISF) of glasses of colloidal hard spheres for several volume fractions and a range of scattering vectors around the primary peak of the static structure factor. The ISF shows a clear crossover from an initi…
Abstract Copolymer properties depend on several parameters and one of the most important is its composition. Typically, this composition is determined by 13 C nuclear magnetic resonance ( 13 C NMR) analysis, which requires a long acquisition time and a fine adjustment of parameters to obtain the desired resolution. In…
Biofouling, a result of protein adsorption and cell adhesion on a surface, is detrimental to membrane performance. The objective of this study is to modify the polycaprolactone (PCL) membrane surface with poly(ethylene glycol) (PEG) to prevent fibroblast adhesion. To achieve this goal, oxygen plasma and PEG(400)-monoa…
Supramolecular polymers are linear chains of low molar mass monomers held together by reversible and directional non-covalent interactions, which can form gels or highly viscous solutions if the self-assembled chains are sufficiently long and rigid. The viscosity of these solutions can be controlled by adding monofunc…