Drastic ground state changes induced by Ni substitution in NaxCoO2
We report on the effect of Ni substitution at the Co site on the physical properties of NaxCoO2 system by investigating the series NaxCo1-yNiyO2 (x=0.75, 0
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
First-principles effective-mass Hamiltonian for semiconductor nanostructures in a magnetic field
A multi-band effective-mass Hamiltonian is derived for lattice-matched semiconductor nanostructures in a slowly varying external magnetic field. The theory is derived from the first-principles magnetic-field coupling Hamiltonian of Pickard and Mauri, which is applicable to nonlocal norm-conserving pseudopotentials in…
Premelting at Defects Within Bulk Colloidal Crystals
Premelting is the localized loss of crystalline order at surfaces and defects at temperatures below the bulk melting transition. It can be thought of as the nucleation of the melting process. Premelting has been observed at the surfaces of crystals but not within. We report observations of premelting at grain boundari…
Magnetoplasticity
Abstract Magnetocrystalline anisotropy and twinned microstructure are at the origin of the appreciable magnetic-field-induced strains found in some ferromagnetic thermoelastic martensites. The change of magnetization across the twinning plane leads to a force on the twinning dislocations when a magnetic field is appli…
Nano-Indentation of SiC and Si<sub>3</sub>N<sub>4</sub>/SiC Ceramic Materials
The present paper deals with the nano-indentation of SiC-micro and Si3N4/SiCmicro/ nano ceramic materials. The investigated SiC-micro and Si3N4/SiC-micro/nano ceramics were prepared by liquid phase sintering. Liquid phase was formed from different sintering additives (Y2O3, Yb2O3, Sm2O3). In the case of Si3N4/SiC-micr…
<title>BaTiO<formula><inf><roman>3</roman></inf></formula> nanocomposite thin films as pyroelectric sensor</title>
BaTiO<sub>3</sub> thin films are commonly used as a pyroelecrtic sensor because this material has a good dielectric, ferroelectric and piezoelectric properties. This paper reports the pyroelectric sensor performance of BaTiO<sub>3</sub>/SiO<sub>2</sub> nanocomposite thin films. The BaTiO<sub>3</sub> nanoparticles were…
Self-Reinforcing Composite Based on Ethylene Acrylic Elastomer (AEM)/Liquid Crystalline Polymer (LCP) Blend
Blends of ethylene acrylic elastomer (AEM) and thermotropic liquid crystalline polymer (TLCP) have been prepared by melt mixing technique. Processing studies indicated a decrease in the viscosity of the blends with the addition of liquid crystalline polymer (LCP). At lower level of LCP the tensile strength and tear st…
Anisotropy of the magnetoelectric effect in terbium molybdate
Anisotropy of the nonlinear magnetoelectric effect in a single-crystal, single-domain sample of the β′ metastable ferroelectric paramagnetic phase of terbium molybdate Tb 2 (MoO 4 ) 3 was studied experimentally in dc magnetic fields of up to 6 T at temperatures of 4.2 and 1.8 K. It was shown that the existing models o…
Cyclic carbonates in the synthesis of biodegradable polymers
In the literature review most important results of studies on biodegradability of aliphatic polycarbonates and copolymers of cyclic carbonates (ethylene carbonate or trimethylene carbonate) with heterocyclic monomers have been presented. A new idea about mechanism of poly(ethylene carbonate) degradation in vivo in the…
Preparation of Potassium Niobate Crystals with Fine Engineered Domain Configurations and Their Enhanced Piezoelectric Properties
Potassium niobate (KNbO 3 ) single crystals were grown by a top-seeded solution growth (TSSG) method. At first, the electric field was applied along [001]c (cubic notification system) direction of KNbO 3 crystals to induce the engineered domain configurations into KNbO 3 crystals. Prior to domain engineering, the piez…
Different Photophysical Properties of Aryl‐bipyridine Linked Pyrene and Anthracene
Abstract 6‐Phenyl‐2,2′‐bipyridine linked pyrene and anthracene were synthesized and their photophysical properties were measured in different solvents with different polarity. 4‐Pyren‐1″‐yl‐6‐phenyl‐2,2′‐bipyridine (Ppbpy) showed significant solvent‐dependent properities while 4‐anthracen‐yl‐9″‐yl‐6‐phenyl‐2,2′‐bipyri…
INTEGRATION OF ACTIVE THIN FILMS WITH SILICON COMPATIBLE MATERIALS AND PROCESS SCIENCE PROTOCOLS FOR MEMS SCALE VIBRATION DAMPING APPLICATIONS
Utilizing a BaSrTiO3/NiTi hybrid composite thin film design on a silicon substrate we have successfully fabricated, characterized, and optimized a high performance vibration control pedestal for passive damping of die level MEMS components. The thin film fabrication and integration protocols were accomplished via semi…
Target Size Analysis by Radiation Inactivation: The Use of Free Radical Scavengers
Several model systems were employed to assess indirect effects that occur in the process of using radiation inactivation analysis to determine protein target sizes. In the absence of free radical scavengers, such as mannitol and benzoic acid, protein functional unit sizes can be drastically overestimated. In the case…
Fouling of Quartz Surfaces in a Low-Pressure High-Output (LPHO) Ultraviolet Disinfection Reactor Treating a Groundwater Source: Foulant Characterization, Distribution, and Phosphate Effects
The application of ultraviolet (UV) irradiation as an effective method of drinking water disinfection continues to grow, stimulated by regulations mandating reductions in disinfection by-products and improved inactivation of Cryptosporidium. Fouling of the quartz lamp sleeves used in UV reactors is a process that can…
Fatigue Crack Propagation Evaluation of Several Commercial Grade Propylene Polymers
Results of an experimental evaluation of commercial propylene polymers' performance under cyclic loading are reported. Experiments were conducted on one extrusion grade homopolymer and one impact block copolymer. The influence of thermal annealing was taken into account on the homopolymer. A laboratory-made mechanical…
Effect of Spontaneous Polarization Screening on Dielectric Response of Ferroelectric Polydomain Films
A theoretical study on the effect of spontaneous polarization screening on the dielectric response of ferroelectric films with 180° domains going through the film thickness (through-domains) is presented. It has been shown by several researchers that the dielectric response of ferroelectrics is always deteriorated (e.…
Characterization of Permanent Fouling on the Surfaces of UV Lamps Used for Wastewater Disinfection
A significant problem with UV disinfection of wastewater is the accumulation of fouling materials at sleeve‐water interfaces. It has been shown that automated chemical and/or mechanical cleaning can remove most fouling materials satisfactorily. However, permanent foulants, which cannot be removed completely by typical…
A Strong Blue Emission Band from Silica Nanospheres Modified with Chlorotrimethylsilane
Well‐defined silica nanospheres with narrow size distribution were synthesized in the reverse micelle system. Chlorotrimethylsilane (CTMS) was used to introduce carbon impurity to the surface of as‐synthesized silica nanospheres. The silica nanospheres modified with CTMS exhibit a strong blue emission band centered at…
The Preparation and Properties of Functionally Graded Alumina/Zirconia-Toughened Alumina (ZTA) Ceramics for Biomedical Applications
Functionally graded alumina/zirconia-toughened alumina (ZTA) ceramics for biomedical applications were designed with a hard, wear-resistant alumina surface and a tough, zirconia-rich core. The main goal was to achieve an improved mechanical performance by introducing a residual compressive stress in the outer surfaces…
Failure Behaviour of High Toughness Multi-Layer Si<sub>3</sub>N<sub>4</sub> and Si<sub>3</sub>N<sub>4</sub>-TiN Based Laminates
Multi-layer laminates were produced using alternating layers of Si3N4 and Si3N4+TiN. The differences in the coefficient of thermal expansions between the alternating layers lead to residual stresses after cooling. These are compressive in the Si3N4 layers and tensile in the Si3N4+TiN layers. The existence of these str…