Materials Literature
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Leakage current properties of K0.5Na0.5NbO3 (KNN) single crystals grown by a flux method have been investigated to establish a guiding principle of defect control for high-performance lead-free piezoelectric devices. The substitution of Mn at the Nb site and the following annealing under moderate oxidation condition w…
With expanding interest in graphene-based electronics, it is crucial that high quality graphene films be grown. Sublimation of Si from the 4H-SiC(0001) (Si-terminated) surface in ultrahigh vacuum is a demonstrated method to produce epitaxial graphene sheets on a semiconductor. In this letter the authors show that grap…
Unexpected lighting up: A slight rotational twist and rigidification of merocyanine dyes in a face-to-face π-π-stacked dimer aggregate resulted in an unexpected increase in the fluorescence intensity and lifetime (see graph). This result contrasts the common perception that the fluorescence of H-aggregates is strongly…
The low-energy theory of interacting electrons on graphene's two-dimensional honeycomb lattice is derived and discussed. In particular, the Hubbard model in the large-N limit is shown to have a semimetal-antiferromagnetic insulator quantum critical point in the universality class of the Gross-Neveu model. The same equ…
Conducting carbon nanotube networks formed in an epoxy polymer matrix can be utilized as highly sensitive in situ sensors for detecting the onset, nature, and evolution of damage in advanced polymer-based composites using direct-current measurements (see figure). These results hold promise for evaluation of autonomic…
The effects of hot pressing on electric performance and mechanical strength of Bi0.5Sb1.5Te3 thermoelectric material prepared through vacuum melting and milling were studied. The phase constituent and microstructure were analyzed by X-ray Diffraction and cold field emission Scanning Electric Microscope. Aeolotropisms…
A broad spectrum of the fundamental principles of ceramic monoliths as supports in different applications based on catalytic reactions is presented in this review. Importance of selecting right ceramic structure, carrier materials etc has been discussed in detail focusing on several major studies performed since ‘50s…
We have studied electroluminescence (EL) and reported that EL activity in XLPE with dried water-tree degradation is higher than that in virgin XLPE. Dried water-treed XLPE is reported to contain excess number of micro voids and also polar groups different from those in virgin XLPE. EL spectrum is detected in the visib…
Summary form only for tutorial. This review talk will present some latest research results in the area of complex artificial electromagnetic materials (metamaterials). Special emphasis will be put on the work done by the European Metamorphose Network of Excellence and at Helsinki University of Technology. Also, the Me…
The electroluminescence activity of different polymers (LDPE, PI, PET, PP and PEN) has been investigated from low to high AC 50 Hz electric fields. Experiments have been focused on the evolution of the electroluminescence intensity versus applied voltage. Three different electroluminescence regimes have been distingui…
A novel compound with the formula [Na2(H2O)10](NH4)3(NH3)[MoV9O28] has been synthesized for the first time and characterized by single crystal X‐ray diffraction, infrared spectrum, UV spectrum, element analysis and ICP analysis. The complex crystallizes in the triclinic space group P−1, with a=0.864 5(4) nm, b=1.044 8…
A Polyaniline/In2O3nanofiber composite based surface acoustic wave (SAW) gas sensor has been developed. Chemical oxidative polymerization of aniline was employed to synthesize polyaniline nanofibers with lIn2O3nanoparticles. The nanocomposite was deposited onto a layered ZnO/64deg YX LiNbo3SAW transducer. The sensor w…
The reorientational mobilities of molecules in nonlinear optical (NLO) polymers poled by thermal-assisted (TAP) and photoassisted (PAP) electric-field polings are compared by measuring the temporal development of the NLO properties under a secondary poling voltage at a temperature below the glass transition temperatur…
Boron-modified polyvinylsilazanes have been studied for suitability as fiber precursor. A melt-tractable polymer displaying Si- and N-bonded methyl groups was successfully processed into green fibers ~18μm in diameter via a melt-spinning process. After the shaping process, the use of an ammonia curing atmosphere at 20…
Local blistering observed upon high-temperature annealing of natural diamond single crystals implanted by 350-keV hydrogen ions with a dose of 12 × 1016 cm−2 is studied. Based on room-temperature measurements, Griffith cracking criterion, and gas law, model quantitative calculations of blister size (R j = (0.361−5.568…
The isotropic Sm2Fe17Nx magnetic powders were prepared by Hydrogenation-Disproportion-Desorption-Recombination (HDDR) process. The phase and microstructure evolutionary process of Sm-Fe alloy during the solidification, homogenization, HDDR and nitration processes were investigated by means of XRD, SEM, EDX and AFM. Th…
The dispersion stability of graphite-HNO 3 suspensions was studied in relation to the acid concentration, dispersity of the graphite powder, and solid-to-liquid phase ratio. The relative electrical resistivity was determined for the same system.
The effect of 2.5 at. % Ca addition on the grain size and crystal lattice of hydrothermally produced barium titanate nanopowders was studied by field-emission transmission electron microscopy (FE-TEM). The fabrication of the nanopowders involved the heat treatment of Ba 0.975 Ca 0.025 TiO 3 and BaTiO 3 powders. The gr…
Effect of crystallinity change on electrical conduction characteristics of poly-L-lactic acid was studied experimentally. The crystallinity was changed by thermal annealing. The lower crystallinity samples have more remaining charge than the higher crystallinity samples. Moreover, at 80 degC that is above their glass…
Charge distributions in electron beam irradiated polymers are observed using the pulsed electro-acoustic (PEA) method. In space environment, bulk charge accumulation in insulating materials of a spacecraft, which is exposed in the radiation of cosmic rays, is one of remarkable problems because the accumulation may som…