Materials Literature
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Abstract The composite of manganese dioxide‐polyaniline (MnO 2 ‐PANI) was successfully prepared by cyclic voltammetry (CV) from a 0.5 M H 2 SO 4 solution containing 0.2 M aniline and 0.5 M MnSO 4 . Scanning electron microscopy (SEM) images revealed that cauliflower like manganese dioxides entangled with PANI were gene…
We investigate the effects of magnetic impurities in a superconducting state with s ± pairing symmetry. Within a two-band model, we find that the intra-band magnetic scattering serves as a pair breaker while the inter-band magnetic scattering preserves pairing and hardly affects transition temperature in the Born limi…
The elastic coefficients (C ij ), bulk compression moduli (B), and shear moduli (G) of layered tetragonal LaFeAsO, SrFe2As2, and LiFeAs crystals, which are potential basic phases for new superconductors of the 1111-, 122-, and 111-FeAs groups, respectively, have been calculated from first principles using the full-pot…
The peculiarities of the modified Stepanov technique are considered. The advantages of the method for growth of oxide crystals from melts of complex compositions are shown. Crystallization conditions are given to obtain optically homogeneous Sr x Ba1 − x Nb2O6, BaWO4, SrMoO4, LiNbO3, and Ca3(Nb, Ga)2Ga3O12 single crys…
Abstract The crystal structure of nechelyustovite, ideally Na 4 Ba 2 Mn 1.5 ☐ 2.5 Ti 5 Nb(Si 2 O 7 ) 4 O 4 (OH) 3 F(H 2 O) 6 , a 5.447(1) Å, b 7.157(1) Å, c 47.259(9) Å, α 95.759(4)°, β 92.136(4)°, γ 89.978(4)°, V 1831.7(4) Å 3 , space group P , Z = 2, D calc. 3.041 g cm –3 , from Lovozero alkaline massif, Kola Penins…
The relationship between the degree of stress concentration and the H p(y) signals of metal magnetic memory was investigated by tension–tension fatigue tests. Sheet specimens of 45CrNiMoVA steel were machined and two types of notches were cut into them to obtain two stress concentration factors. During the testing pro…
Abstract Ga-rich plumbogummite, (Pb 0.87 ,Ca 0.13 )Σ 1.00 H(Al 1.95 ,Ga 1.05 ) Σ3.00 (PO 4 ) 2 (OH) 6 , from Tsumeb, Namibia, has rhombohedral symmetry, space group R m , with the cell parameters a = 7.0752(19) Å, c = 16.818(4) Å and V = 729.1(3) Å 3 . The crystal structure has been refined to R 1 = 2.05%. Ga-rich plu…
The stator insulation breakdown is a major cause of AC machine failures. Ground insulation defaults are easily detected by classical systems based on leakage current measurements, however the turn-to-turn insulation degradations are more difficult to detect. For large machines, on-line methods, based on partial discha…
Here, we report the polymeric (copolymer of benzene and pentacene) nanoparticles (PNPs) induced vertical alignment in ferroelectric liquid crystals (FLCs). The nanoparticles used in this study have been synthesized via chemical route method. The PNPs have been doped in FLC mixture. It has been observed that pentacene…
Abstract Ni‐loaded pure siliceous and aluminosilicate MCM‐41 (Ni/MCM‐41) and nickel‐loaded silica (15Ni/SiO2) were synthesized via wet impregnation and were characterized by various techniques. The H2 consumption in the TPR analysis was found to be proportional to the Ni amount in the calcined samples. After reduction…
Main characteristics of heat-conducting adhesive materials used to withdraw heat from warming elements of devices and the joints of electrotechnical equipment are presented. The developed materials, i.e., TsMK-TP adhesive pastes and TPK convenient for application adhesives, are cold-curing compositions based on epoxy-…
A modified cathodic disbondment (CD) test was carried out over a period of 14 months using 13 different pipeline coatings. During the test the current was recorded every 4 h. Certain types of coatings developed blisters after 60 days. The formation of the blisters resulted in characteristic spikes in the current. Othe…
Abstract We report the sonophysically‐exfoliated methods access to the preparation of homogeneous‐free multi‐walled carbon nanotubes (MWCNTs) in water solution. Highly stable, uniform, individual MWCNTs are entirely performed through sodium dodecylsulfate surfactants by means of a tip sinicator. HRTEM images show that…
The waterborne polyurethane (PU) prepolymer was prepared based on the polyester polyol (N220), isophorone diisocyanate (IPDI), and dimethylol propionic acid (DMPA). The waterborne polyurethane-acrylate (PUA) dispersions were prepared with different proportions of acrylate by in situ dispersion technique. The structure…
We report aggregated nanostructure formation of water insoluble meso-tetramesitylporphyrin (MTMP) induced by hydrogen chloride (HCl) vapor on a glass plate. The formation of aggregated nanostructures of MTMP was confirmed by UV-vis, time-resolved emission spectral techniques, atomic force microscopy (AFM), and high re…
Based on density functional theory calculations including an on-site Hubbard U term, we investigate the effect of substrate-induced strain on the properties of ferrimagnetic hematite-ilmenite solid solutions and heterostructures. While the charge compensation mechanism through formation of a mixed Fe2+, Fe3+-contact l…
OBJECTIVE: The objective of this work was to explore a new modality of cell tracking that uses multifunctional nanoparticles. The tracking of transfused cells in vivo is an important step to study the therapeutic course and mechanism of cell therapeutics. BACKGROUND DATA: Several methods of cell tracking have been dev…
Northern Finland is home to a yacht builder that has become legendary among yachtsmen whose primary focus is cruising but who nevertheless crave top-notch performance. Baltic Yachts relies on high-tech composites when producing the strong yet light structures that enable it to meet their high expectations. George Mars…
Abstract By combining azide and the ( Z )‐1,1,1‐trifluoro‐4‐(quinolin‐8‐ylamino)but‐3‐en‐2‐one enaminone ligand, HL, an azido‐bridged copper(II) one dimensional polymer was synthesized in a one‐pot reaction. The solved and refined crystal structure evidenced the unusual single and asymmetric end‐to‐end coordination mo…
Oxygen is essential for many forms of life and its depletion in the body and the environment can lead to deleterious effects. Low oxygen conditions, even anoxia, are associated with eutrophication of lakes and rivers, wherein an over abundance of nutrients often caused by pollution result in excessive plant growth and…