Materials Literature
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。
The crystal structure solution of the title compound is determined from microcrystalline powder using a multi-technique approach that combines X-ray powder diffraction (XRPD) data analysis based on direct-space methods with information from (13)C solid-state NMR (SSNMR), and molecular modelling using the GIPAW (gauge…
This study is focused on understanding the effects of kaolinite content and freezing rate on the microstructure, surface area, and flexural strength of freeze‐cast kaolinite–silica nanoparticle composites. Scanning electron microscopy reveals that the bulk of the composites contain interconnected pores and that the si…
Abstract The macroscopic properties of most materials are strongly influenced by grain size. In ceramic materials the microstructure usually results from the sintering process. Understanding the basic mechanisms of grain growth on an atomic length scale in ceramics would be beneficial to tailor the microstructure for…
We report a new and simple method for the formation of thin films at the interface between aqueous silica Ludox dispersions and lipid solutions in decane. The lipids used are stearic acid, stearyl amine, and stearyl alcohol alongside silica Ludox nanoparticle dispersions of varying pH. At basic pH thin films consistin…
CoFe(2)O(4)-TiO(2) and CoFe(2)O(4)-ZnO nanoparticles/film composites were prepared from directed assembly of colloidal CoFe(2)O(4) in a Langmuir-Blodgett monolayer and atomic layer deposition (ALD) of an oxide (TiO(2) or ZnO). The combination of these two methods permits the use of well-defined nanoparticles from coll…
Vertical and adiabatic ionization potentials of Na2X (X = SH, SCH3, OCH3, CN, and N3) superalkali molecules have been studied using the ab initio methods. The smallest vertical ionization potential was calculated for the Na2OCH3 system (4.365 eV). The Na2X molecules were found to be capable of forming stable [Na2X]+[Y…
Rapid nitridation was used to fabricate reaction‐bonded and postsintered β‐Si 6− Z Al Z O Z N 8− Z ( Z =1) ceramics with monoclinic ZrO 2 added to the starting powder. Thermo‐gravimetric analysis revealed that the addition of ZrO 2 reduced the starting temperature of the main nitridation reaction. Using a reaction‐bon…
Nanocrystalline gadolinia‐doped ceria (GDC) specimens with grain sizes ranging from 10 to 100 nm were studied by AC‐impedance spectroscopy over the temperature range of ∼150°–∼300°C, and were analyzed by the nanograin composite model (n‐GCM), which is capable of extracting local properties (grain‐core conductivity, gr…
The electronic as well as magnetic properties of ${\text{Ga}}_{x}{\text{Fe}}_{1\ensuremath{-}x}$ films were studied by soft x-ray measurements. Using x-ray magnetic circular dichroism the Fe majority-spin band was found to be completely filled for $x\ensuremath{\approx}0.3$. With further enhanced Ga content, the Fe mo…
We report the use of scanning tunneling spectroscopy (STS) to investigate one-dimensional quantum confinement effects in lead sulfide (PbS) thin films. Specifically, quantum confinement effects on the band gap of PbS quantum wells were explored by controlling the PbS film thickness and potential barrier height. PbS qu…
In situ dispersive X-ray absorption spectroscopy (DXAS) measurements were used to monitor the Pt nanoparticle formation by hydrogen reduction of PtO 2 at 150 °C. The kinetics of the reduction process, as well its dependence on the percentage of H 2 in the reductive gas mixture, was investigated. The results reveal tha…
The adsorption and reaction of ethylene on Pt/CeO(2-x)/Cu(111) model catalysts were studied by means of high resolution photoelectron spectroscopy (HR-PES) in conjunction with resonant photoemission spectroscopy (RPES). The dehydrogenation mechanism is compared to the HR-PES data obtained on a Pt(111) single crystal u…
We investigate the electronic and magnetic properties of (Ga,Mn)N nanocrystals using the density functional theory. We study both wurtzite and zinc-blende structures doped with one or two substitutional Mn impurities. For a single Mn dopant placed close to surface, the behavior of the empty Mn-induced state, hereafter…
Adhesive tapes are attached to human skin for various purposes. When they are removed by peeling, discomfort or trauma may occur. Typically, the removed tape is partially covered by skin cells, and peeling involves failure within the substrate (skin), rather than just interfacial failure between the adhesive and the s…
Abstract Novel organic–inorganic composites were prepared by curing hydrogenated carboxylated nitrile rubber (HXNBR) with epoxycyclohexyl polyhedral oligomeric silsesquioxanes (POSS) through chemical bonding of carboxyl groups of HXNBR and epoxy groups of POSS. The process of the curing reaction was investigated using…
Herein, we report on the crystal structures of the isostructural ${\text{Ti}}_{3}{\text{SiC}}_{2}$ and ${\text{Ti}}_{3}{\text{GeC}}_{2}$ phases determined by Rietveld analysis of neutron diffraction data in the $100\ifmmode^\circ\else\textdegree\fi{}$ to $1100\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$ temper…
This paper develops a physically-based analytical theory that can be used to model recoil loops, as well as major loops and first- and second-order return curves, in hard ferromagnetic materials that display return-point memory. Atomic-scale quantum-mechanical considerations lead to basic S-shaped magnetization curves…
To visualize the biodistribution of porous silica microparticles in vivo, known ligands are used to immobilize gadolinium in the pores for use as MRI contrast agents. MRI studies with rodents show that a fraction of the microparticles administered by intraperitoneal injection passed through the kidneys by an unknown m…
A nanosized β‐Si 3 N 4 ‐based powder doped with sintering additives of 6 wt% Al 2 O 3 and 8 wt% Y 2 O 3 were sintered by spark plasma sintering at different heating rates. The in situ shrinkage curves were measured to identify the densification mechanism during the rise in temperature. At slower heating rates (50 and…
This paper presents the mechanical polishing effects on the surface domains and crystal structures of relaxor‐based Pb(Zn 1/3 Nb 2/3 )O 3 –PbTiO 3 (PZN–PT) single crystals. In normal sample preparation processes, a “surface deformed layer” composed of distorted crystal structures is produced due to intense compression…