Materials Literature
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The possibility to quantitatively analyze total electron yield (TEY) spectra as a measure of the x-ray absorption cross section from supported magnetic nanoparticles is explored by a combination of experiments and Monte Carlo simulations. Unless the particles are very small, it is found that saturation effects are imp…
The electrical properties of polymer-dispersed liquid crystals (PDLCs) are an important characteristic in their electro-optical performance. Conductivity effects can set up depolarization fields in the films reducing the effective field across the liquid crystal droplets. Both theoretical and experimental investigatio…
Abstract Single potassium dihydrogen phosphate (KDP) crystals were grown in a supersaturated solution containing an organic dye (sunset yellow FCF, brilliant blue FCF, and sky blue). The growth rate, morphology, and impurity dye distribution of faces, (100) and (101) in a KDP crystal were measured as dye concentration…
The effect of thermal annealing on switching kinetics of electrically fatigued bulk lead-zirconate-titanate ceramics is demonstrated. Fatigue induces stretched exponential switching behavior reaching time constants in the range of hours. In the final stages of fatigue, all switching is highly retarded. Thermal anneali…
Abstract Summary: A novel hyperbranched poly( β ‐ketoester) was synthesized from 2‐(acetoacetoxy)ethyl acrylate by the Michael addition in the presence of 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) as catalyst. 1 H NMR integration experiments revealed that the degree of branching in the poly( β ‐ketoester) was remarkabl…
Electric field-induced transformation of incommensurate modulations in a Sn-modified lead zirconate titanate ceramic was investigated with an electric field in situ transmission electron microscopy technique. It is found that the spacing between the (1∕x){110} satellite spots and the fundamental reflections do not cha…
Charge generation, transport, and recombination processes in UNIBOND® silicon-on-insulator wafers are studied via an optical second-harmonic generation (SHG) technique. The electric fields at the interfaces vary with time due to charge trapping. The presence of a thin native oxide layer on the top Si film contributes…
Thin films of MgO and BaTiO3 were deposited on (001) GaAs substrates using molecular beam epitaxy and pulsed laser deposition, respectively. X-ray diffraction scans indicate crystalline MgO and BaTiO3 thin films with preferential c-axis orientation. Capacitors fabricated from the BaTiO3∕MgO∕GaAs structures demonstrate…
Theoretical studies to investigate the effect of H absorption on the magnetic moment of small ${\mathrm{Fe}}_{n}$ and ${\mathrm{Co}}_{n}$ clusters have been carried out using gradient corrected density-functional approach. Our studies on clusters containing up to four transition metal and 2 H atoms show that the succe…
A method for the thiolation of single-wall carbon nanotubes has been developed by exposing a sulfur/carbon nanotubes mixture to an argon/hydrogen gaseous plasma. X-ray photoelectron spectroscopy provides evidence of the existence of sulfur attached to carbon on the carbon nanotubes samples and Raman spectroscopy resul…
Electron-hole recombination in CdTe quantum dots was studied by photoluminescence and resonant femtosecond pump–probe measurements. A dependence of recombination times with pump pulse intensity was observed and we attribute this to the Auger recombination process. The overall kinetic processes that we observed are a f…
Raman spectra of binary alkali silicates were measured at various temperatures from 1300°C to room temperature to investigate the relation between structural change and phase transformation phenomena. Distribution of structural units of Q n was estimated at each temperature by the deconvolution of spectra based on the…
We perform molecular dynamics simulations of short-range attractive colloid particles modeled by a narrow (3% of the hard sphere diameter) square well potential of unit depth. We compare the dynamics of systems with the same thermodynamics but different bond lifetimes, by adding to the square well potential a thin bar…
We have fabricated an all-solid state and vertical electrochemical transistor, which employs poly(3-hexylthiophene) and cyanoethylpullulan as the semiconducting layer and solid electrolyte, respectively. The device has the same structure as a vertical field effect transistor, but can function using a different mechani…
BACKGROUND: A new method was established to characterize the binding kinetics of DNA toward layered double hydroxides (LDHs). The setup consisted of a newly developed sampling tube that allows the injection of analyte during the flow cytometric measurement. METHODS: Layered double hydroxides consist of cationic metal…
Scanning tunneling microscopy is used to investigate the appearance of nanoscale islands on the SrTiO3(001) surface following cycles of repetitive annealing. Atomic-resolution images reveal that the surface of the islands is covered by features typical of the anatase TiO2(001) surface reconstruction. Small islands dis…
We consider a d -dimensional crystal with an arbitrary harmonic interaction and an anharmonic on-site potential, with a stochastic Langevin heat bath at each site. We develop an integral formalism for the correlation functions that is suitable for the study of their relaxation (time decay) as well as their behavior in…
Some smectic liquid crystals exhibit a series of phases, including ferroelectric, antiferroelectric, and ferrielectric commensurate structures as well as an incommensurate phase. A long-standing problem has been to understand the origin of the long-range interaction responsible for this rich variety of phases. We stud…
We present calculations for the supercooling of a thermoelectric material during a transient current pulse. At room temperature, a standard steady-state cooler produces a maximum temperature drop of 82 K. During a current pulse, this value can be increase to about 108 K. While prior calculations focused on the optimiz…
Ferroelectric (Pb,Sr)TiO3 (PSTO) thin films were epitaxially grown on (001) LaAlO3 (LAO) by using pulsed laser deposition. Microstructural characterizations with x-ray diffraction and transmission electron microscopy indicate that the as-grown films have excellent single crystalline quality and a (001)PSTO∕∕(001)LAO a…