Materials Literature
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Carbon nanotube (CNT) emitters with small emission area were fabricated on graphite rods using CNT films. By introducing the edge polishing process, the field emission performance of the CNT emitter was much improved, which showed a very high emission current of 6.34 mA (1.6 A/cm2) under an applied electric field of 5…
The band-gap insulators RECoO3 (RE = Nd3+, Sm3+, and Dy3+) with Co3+ ions stabilized in the non-magnetic low-spin state have been investigated by specific heat measurements. The experiments evidence an antiferromagnetic ordering of the rare earths with Néel temperature of TN = 1.25, 1.50, and 3.60 K for NdCoO3, SmCoO3…
A series of 1,4-phenylene-spaced bis-imidazoles with fluorescence quantum yields up to 0.90 and large Stokes shifts have been designed and synthesized using recently developed regioselective direct CH arylation protocols. All the fluorophores show a bright blue-green emission that is well retained in the solid state.…
Highly elongated BiFeO3 is epitaxially grown on hexagonal sapphire(0001) substrate within a rather narrow synthesis window. Both X-ray reciprocal space maps and Raman characterizations reveal that it is of true tetragonal symmetry but not the commonly observed MC type monoclinic structure. The tetragonal BiFeO3 film e…
Wet chemistry-based techniques, including widely used hydrothermal and solvothermal synthesis, have emerged as thriving strategies for nanostructure bulk synthesis, which in reality encountered the ubiquitous challenge of corrosion problems during scale-up or further commercialization. In this contribution, as an ende…
Adaptive feedback normally provides the greatest accuracy for optical phase measurements. New advances in nitrogen-vacancy-center technology have enabled magnetometry via individual spin measurements, which are similar to optical phase measurements but with low visibility. The adaptive measurements that previously wor…
associated with a low density to high density phase transition under high pressure. The varying proportion of co-existing phases plays a key role in the macroscopic behavior of this material. Here, we utilize a recently developed X-ray Absorption Near Edge Spectroscopy Tomography method and resolve the mixture of high…
The flame-retardant and anti-dripping properties of biodegradable polylactide (PLA) materials during the combustion process were improved using intumescent flame-retardant (IFR) and different synergists. Organophilic montmorillonite (OMT), zinc borate (ZB), fumed silica (FS), tetraethoxysilane (TEOS) and polytetrafluo…
There is an increasing likelihood of interactions between nanomaterials and munitions constituents in the environment resulting from the use of nanomaterials as additives to energetic formulations and potential contact in waste streams from production facilities and runoff from training ranges. The purpose of the pres…
We performed single crystal structure analysis of Sm2Fe17N3 using X-ray diffraction. A pick-up system combined with a micromanipulation tool driven by piezoelectric actuators and a microgripper was used. A single Sm2Fe17Nx particle with the diameter of about 20 μm was picked up, and X-ray diffraction was measured usin…
A self-consistent field theoretic study is performed to study morphological development of lamellae-forming diblock copolymers on substrates with a well-defined roughness, modeled as trenches of varying depth and width engraved into the substrates. There are three possible lamellar orientations observed: horizontal la…
Optical properties and phase transition of Ce-modified (Na0.5Bi0.5)(Ti0.99Fe0.01)O3 nanocrystalline films have been investigated by spectroscopic ellipsometry from −70 to 500 °C. Temperature dependent dielectric functions in the photon energy range of 0.6–6.4 eV can be derived by the Tauc-Lorentz model. It was found t…
ABSTRACT The colloidal microstructure of concentrated suspensions containing anionic comb‐polymer‐stabilized magnesium oxide (MgO) particles in water was analyzed by shear rheometry for indications of changes in particle microstructure based on particle size and comb‐polymer usage. As the suspensions were sheared at d…
Integration of a thin uniform layer of highly porous silicon on top of ultra-compact silicon-on-insulator microresonators is experimentally demonstrated via magnesiothermic reduction, enabling increased surface area for analyte adsorption as well as high Q-factor (~22 000). The demonstrated sensitivity is ~0.8 pm (pg…
In the present study, nanostructuring effect of multi-walled carbon nanotubes (MWCNTs) on electrochemical properties of coal tar pitch (CTP) based carbon foam (CFoam) was investigated. The different weight fractions of MWCNTs were mixed with CTP and foam was developed from the mixture of CTP and MWCNTs by sacrificial…
Hydrogen impurities in SnO2 films and bulk ceramics were investigated in terms of mass transport and electron transport. The hydrogen concentration (n[H]) in these samples was found to be 1019 cm−3 or higher. Further increase in n[H] could be achieved by annealing the samples in a humid atmosphere. The isotope tracer…
Wicking is an important characteristic which determines the moisture management of the textile products, and thereby has a large impact on comfort. Different techniques have been used to examine the longitudinal or in-plane flow behaviour of the liquid in the porous network of the fibrous assemblies. This paper descri…
ABSTRACT In this work we showed the promising perspectives offered by the radiofrequency plasma processes on polymeric substrates. Polystyrene (PS) films with micropatterned grooves and nanostructured roughness were developed by Oxygen plasma treatment coupled with mask, and t process parameters, as power supply and t…
Polyphenylene oxide and the intumescent flame retardant were used in combination to achieve the fire-retardancy of polystyrene. The IFR system is mainly composed of ammonium polyphosphate, pentaerythritol and melamine. To solve the problems existed in the ternary IFR system, such as hydrophilicity and heterogeneity in…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Shen Lai, Sung Kyu Jang, Young Jae Song, Sungjoo Lee; Probing graphene defects and estimating gra…