Materials Literature
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Soils of the southern Driftless Area of Wisconsin are derived from loess mantles and dissolving carbonate from dolostone bedrock found in formations of the Sinnippi Group. Contributions of the two parent components can be estimated by utilizing volumetric compositions of the relatively immobile elements Ti and Zr. The…
Three-photon absorption (3PA) and three-photon-excited photoluminescence (3PE-PL) of ZnSe/ZnS and copper-doped ZnSe/ZnS core-shell quantum dots (QDs) in aqueous solutions have been unambiguously determined by Z-scan and 3PE-PL measurements with 200-fs laser pulses at 1000 nm. The 3PA cross-section is as high as 3.5 x…
The ternary tellurite glass structure (TeO2-ZnO-Na2O) was analysed using the Raman spectroscopy in the range of 300-1000 cm-1. The influence of the concentration of alkali ion oxide on the structural change of tellurite glasses was discussed. It is evident that the network of structural units changes significantly wit…
Microfibres denote synthetic fibres that are finer than any fibre in nature. Microfibres are usually made of polyester, polyamide, acrylic, modal, lyocell and viscose in the range of 0.5–1.2 dtex. The progress starts with direct spinning and post-spinning developments for manufacturing microfibres. Researches on conju…
Density-functional based tight-binding method in conjunction with nonresonant bond-polarization theory is used to predict Raman spectra of single-walled carbon nanotubes with vacancies. Calculations show that the high-energy Raman active modes are more sensitive to vacancies and their energy is generally lowered, whil…
Although Poisson's ratio (ν) is a macroscopic elastic parameter it depends much on the fine details of the atomic packing. Glasses exhibit a wide range of values for from 0.1 to 0.4 which correlate to the glass network polymerisation degree, hence reproducing at the atomic scale what is observed in cellular material…
We apply first-principles calculations to investigate the interplay between electronic and magnetic properties of carbon nanotubes with line defects. We consider three types of defects: lines of C--O--C epoxy groups, and defects resulting from the substitution of the oxygen atoms by CH2 or C2H4 divalent radicals. We f…
A facile solvothermal method was successfully utilized to synthesize well-crystallized magnetite (Fe 3 O 4 ) nanoparticles through high-temperature decomposition of intermediate complexing compound using diethylene glycol (DEG) and diethanolamine (DEA) as solvent and complexing agent. Then a novel egg-yolk-like magnet…
We present an investigation of the optical properties of gold pyramidal shell nanoparticles. Theory shows a multiresonance spectrum at near-infrared wavelengths that is consistent with the measured extinction spectra of particles that are fabricated using a soft-lithography technique. In addition to electric dipole an…
Glasses in the composition range in mol% 35-50 ZnO – 10-15 Al2O3 – 40-55 SiO2 were prepared, undoped and doped with 1 x 1019 and 1 x 1020 Sm3+ per cm3 glass as luminescent species for the visible region, especially for blue and red emission. Phase separation occurs in glass samples with high SiO2 content. SiO2-rich dr…
The Seebeck coefficient, Q , of ternary 40TeO 2 –(60− x )V 2 O 5 – x MoO 3 bulk glasses was measured in the temperature range 260–450 K. The thermoelectric power at 400 K was measured and was in the range from −677 to −501 µV K −1 for TeO 2 –V 2 O 5 –MoO 3 glasses. For the present glass systems, Heikes' formula was sa…
The photoluminescence quenching of a CdSe quantum dot by hexanethiolate-monolayer-protected gold clusters (MPCs) with core diameters of 1.1−4.9 nm is described. Experimental evidence suggests that the quenching occurs via an energy transfer mechanism. The energy transfer quenching efficiencies of MPCs were compared us…
Mass spectrometry (MS) is an established analytical technique to analyze evolved gas in thermogravimetry (TG). In this study, for the first time a novel SPI-MS technique using an electron beam pumped VUV excimer lamp as photon source (lambda = 126 nm) was employed in conjunction with thermogravimetry. The coupling was…
We present experimental studies on the effect of pyridine treatment on the optical properties of ligand-stabilized colloidal CdTe nanocrystals. We demonstrate, by quasi-stationary and time-resolved photoluminescence (PL) spectroscopy, a drastic reduction in the PL lifetime and a concomitant decrease in the PL yield by…
A combined imaging and dynamic light scattering (DLS) system has been developed for routine measurements in droplets in the multiwell plates used in protein crystallization. The system was tested with several standard proteins and found to be of high value for rapid identification of good crystallization conditions. A…
An in situ high-temperature--high-pressure study of liquid chalcogenide AsS by x-ray diffraction, resistivity measurements, and quenching from melt is presented. The obtained data provide direct evidence for the existence in the melt under compression of two transformations: one is from a moderate-viscosity molecular…
Nanostructured poly(vinylidene fluoride) (PVDF)/acrylic rubber (ACM) blends have been prepared by simply melt blending of PVDF and several percent of ACM. The morphology and properties of the prepared nanoblends have been investigated by means of transmission electron microscopy (TEM), dynamic mechanical analysis (DMA…
Nickel nanochains assembled with submicrometer-sized hollow spheres were synthesized through a mild polyol reduction method by using PVP as the soft template. The resulting fiberlike superstructures were characterized by using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and high-…
Graphene nanodisk is a graphene derivative with a closed edge. The trigonal zigzag nanodisk with size $N$ contains a zero-energy sector with the $\text{SU}(N)$ symmetry. We investigate electron-electron interaction effects within the zero-energy sector. We explicitly derive the direct and exchange interactions, which…
This paper proposes a two-dimensional elastic shell model to characterize the deformation of single-walled carbon nanotubes using the in-plane rigidity, Poisson ratio, bending rigidity and off-plane torsion rigidity as independent elastic constants. It was found that the off-plane torsion rigidity of a single-walled c…