Materials Literature
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Using a novel protocol for mixing oppositely charged colloids and macromolecules, magnetic clusters and rods are fabricated using 10 nm-iron oxide nanoparticles and polymers. Here, we show that as the dispersions undergo the so-called desalting transition, spherical clusters in the range 100 nm - 1 μm form spontaneous…
A simple and efficient method to induce porosity both in the core and on the surface of electrospun submicrometer polymer fibers has been demonstrated by combining nonsolvent-induced phase separation with electrospinning. In this modified electrospinning process, fibers are collected in a bath filled with a nonsolvent…
Possible mechanisms for the breakage of molecular crystals under high-intensity ultrasound were investigated using acetylsalicylic acid (aspirin) crystals as a model compound for active pharmaceutical ingredients. Surprisingly, kinetics experiments ruled out particle-particle collisions as a viable mechanism for sonof…
We investigated and compared the concentration-dependent cytotoxicity of single-walled carbon nanotubes (SWCNTs) and SWCNTs functionalized with polyethylene glycol (SWCNT-PEGs) in neuronal PC12 cells at the biochemical, cellular, and gene expressional levels. SWCNTs elicited cytotoxicity in a concentration-dependent m…
Fast, robust, and inexpensive screening methods are the heart of drug discovery processes. Moreover, it is useful to have access to several established assay formats, for validation purposes. If a targeted protein is an enzyme, the logical and widely used approach is the direct measurement of the effect of the added l…
High-throughput screening was employed to evaluate bactericidal activities of hybrid Ag-TiO₂ nanoparticles comprising variations in TiO₂ crystalline phase, Ag content, and synthesis method. Hybrid Ag-TiO₂ nanoparticles were prepared by either wet-impregnation or UV photo deposition onto both Degussa P25 and DuPont R90…
In this research, silver nanoparticles (AgNPs) were synthesized in chitosan (Cts), Cts/gelatin and gelatin suspensions using a chemical reducing agent. Cts and gelatin were used as natural stabilizers and solid support, whereas AgNO(3) was used as the silver precursor. Sodium borohydride (NaBH(4)) was used as the redu…
Multidrug resistance (MDR) is a major impediment to the success of cancer chemotherapy. The intracellular accumulation of drug and the intracellular release of drug molecules from the carrier could be the most important barriers for nanoscale carriers in overcoming MDR. We demonstrated that the redox-responsive micell…
Size effects in heat conduction, which occur when phonon mean free paths (MFPs) are comparable to characteristic lengths, are being extensively explored in many nanoscale systems for energy applications. Knowledge of MFPs is essential to understanding size effects, yet MFPs are largely unknown for most materials. Here…
Bismuth ferrite films on single-crystal lanthanum aluminate substrates have been grown for the first time through spray pyrolysis of iron and bismuth methacrylate solutions. The film growth process comprises two steps: liquid-phase and crystalline (including pyrolysis). In the liquid-phase step, we analyzed the elemen…
Rhombohedral BiFeO 3 has a ferroelectric polarization along [111]. Polarization of the single crystal was measured and showed small polarizations of 6.1 C/cm 2 along [111] and 3.5 C/cm 2 along [100] at 80 K (Teague et al., 1970). These small polarizations are regarded as low sample-quality now. Recent reports showed s…
We fabricated 18 O-exchanged SrTi 18 O 0.03 x 16 O 0.03(100- x ) (STO18) thin films on SrTi 16 O 3 (001) single-crystal substrates by pulsed laser deposition from a SrTi 18 O 3 single-crystal target at various growth temperatures and 16 O 2 partial pressures. The diffusion of 16 O from the substrate could be successfu…
IntroductionThe family of amino-acid ferroelectrics involves large number of crystals the chemical composition of which is based on combinations of different amino-acids (betaine (CH 3 ) 3 N + CH 2 COO -), sarcosine (CH 3 NHCH 2 COOH), glycine (H 2 NCH 2 COOH)) and nonorganic acids (H 3 PO 3 , H 3 AsO 4 , H 3 PO 4 , H…
Lead Titanate-Based Nanocomposite: Fabrication, Characterization and Application and Energy Conversion Evaluation
We present experimental evidence for self-organization of nickel microparticles in silicon under certain thermodynamic conditions of nickel diffusion doping. The concentration and distribution of the microparticles in silicon are very uniform. Additional anneals lead to self-ordering of the impurity microparticles.
Growth and Characterization of Single Crystals of Potassium Sodium Niobate by Solid State Crystal Growth
SBN exhibits excellent dielectric non linear properties and one of the largest known Pockels electro-optic coefficient. Thin films of SBN are therefore particularly attractive for their potential use as low voltage electro-optic waveguides or for the realization of electrically-tunable photonic crystals. This chapter…
Symmetry methods of the theory of second-order phase transitions are used to clarify the structural mechanism of the transition from the cubic ( Fd 3 m ) to the tetragonal ( P 4 1 2 1 2) phase of magnesium titanite. The proposed mechanism is consistent with all experimental structural data reported to date for magnesi…
Films 150–200 nm in thickness, with the nominal composition Mg(Fe 0.8 Ga 0.2 ) 2 O 4 − δ have been grown on (100) single-crystal silicon substrates by ion-beam sputtering in vacuum. The effect of growth and annealing conditions on the crystal structure and morphology of the films has been studied, and the thermal cond…
The structure of (Nd0.7Sr0.3)1 − x Mn1 + x O3 ± δ solid solutions with x = 0–0.2 (Nd: Sr atomic ratio maintained constant at 2.33) annealed at temperatures from 1200 to 1500°C has been studied by X-ray diffraction. The results demonstrate that, as the annealing temperature is raised, the atomic order in the stoichiome…