Materials Literature
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Recent years, propolis has plenty of biological and pharmacological properties and its mechanisms of action have been widely investigated. There is a substantive database on the biological activity and toxicity of propolis indicating it may have many antibiotic, antifungal, antiviral and antitumor properties, among ot…
It has been established that high-pressure torsion at 80 K does not lead to the formation of a homogeneous submicrocrystalline structure in copper. A significant volume of the structure is occupied by dislocation cells and deformation twins. Heating to the room temperature results in recrystallization. The volume frac…
Polyimide thin films both unmodified and modified with hyperbranched polyethoxysiloxane were treated with accelerated oxygen plasma flow to imitate a low Earth orbit environment. The resulting changes in the surface morphology were studied using scanning electron microscopy. The erosion yield values were calculated an…
The optical properties of a new photorecording polymer based on 2,2-difluoro-4-(9-anthracyl)-6-methyl-1,3,2-dioxaborine have been investigated. This material is found to change its absorption coefficient and refractive index in the visible range under illumination with a wavelength λ = 405.9 nm. This circumstance make…
This study has been conducted to investigate the influences of sand addition and mixing waters with different ratios on the physico-mechanical properties of magnesium oxychloride cement (MOC) masonry units. Three mixtures (M, MI and MII) were prepared to make magnesium oxychloride cement from the sand dunes as a fille…
The purpose of the present study was to investigate the preparation and characterization of a polymeric micellar formulation of Carmofur (HCFU) with Pluronic P123. The polymeric micelles of HCFU with Pluronic P123 were prepared by thin-film hydration method. The characteristics of micelles were studied, including morp…
Nitrogen-doped carbon nanotubes (N-CNTs) are synthesizd by using plasma-enhanced chemical vapor deposition (PECVD) and thermal chemical vapor deposition (TCVD) because PECVD and TCVD are attractive methods for producing N-CNTs. In this paper, we report the experimental observation of nitrogen incorporation in multiwal…
Abrasive Wear Resistance of Cast Iron with Precipitates of Spheroidal VC Carbides The paper presents the results of abrasive wear resistance tests carried out on high-vanadium cast iron with spheroidal VC carbides. The cast iron of eutectic composition was subjected to spheroidising treatment using magnesium master al…
It has been demonstrated on the basis of absorption spectra measurements that the activation of glassy lithium tetraborate by terbium results in the formation of band of localized electronic states in the pseudo-band gap, which correspond to the energy levels of rare earth element ions. As follows from the analysis of…
Four metal tert -butoxides, namely: aluminum (III) tert -butoxide, Al (O t -C 4 H 9 ) 3 , tin (II) tert -butoxide, Sn (O t -C 4 H 9 ) 2 , titanium (IV) tert -butoxide, Ti (O t -C 4 H 9 ) 4 , and lithium tert -butoxide, Li (O t -C 4 H 9 ), were used as initiators in the bulk ring-opening polymerization (ROP) of ε-capro…
We fabricated multilayer graphene directly on SiO 2 by annealing sputtered amorphous carbon with a catalyst – a simple non-chemical vapor deposition method – without the use of complicated transfer processes. Structural analysis revealed that the graphene sheets formed an epitaxial structure aligned to the Co(111) sur…
Low-carbon ferrite-bainite pipe steels of the K65 (Kh80) strength grade produced by two manufacturing companies have been studied using different mechanical tests and fractographic analysis of fractured surfaces. The results demonstrate that the energy capacity a (a c) and the true relative reduction at fracture φf up…
BACKGROUND: Photochemical transformation of certain bioactive compounds for the purpose of obtaining derivatives with increased bioactivity is a prospective area of synthetic chemistry. Ecdysteroids, analogs of the insect molting hormone, which can also exert several beneficial effects in mammals including humans, con…
The GdVO4 single crystals, both undoped and doped with erbium or thulium, were studied by means of X-ray diraction topographic methods exploring laboratory and synchrotron radiation sources. Variously developed block structure, caused probably by thermal stresses, was revealed. The highest crystallographic perfection…
The specific heat in a typical Pd 40 Ni 10 Cu 30 P 20 metallic glass forming system is investigated. It is found that the specific heat of the metallic liquid is around 4.7R (R is the gas constant) and that it is almost independent of temperature. The glass transition observed during cooling is accompanied by a decrea…
Cupromakopavonite, ideally Cu8Ag3Pb4Bi19S38, is a new mineral species found in quartz veins at the scheelite deposit Felbertal, Salzburg Province, Austria. It is associated with makovickyite, oversubstituted krupkaite ( bd 55), hodrusite, and kupcikite. The mineral is opaque and grey with a metallic luster; it is brit…
Nylon 6/clay nanocomposite films were prepared by melt mixing nylon 6 with organoclay using a twin screw extruder attached to a blown film die. The type of surfactant used in the pretreatment of organoclay was expected to affect the degree of clay dispersion, which would in turn affect the degree of crystallinity, cry…
Controlled release of additives and adhesives at the right place and the right time is a key functionality that can be provided by microencapsulation technology. A timely and targeted release improves the effectiveness of additives and adhesives, broadens their application range, and ensures optimal dosage, thereby im…
The mixture of poly(lactide-co-glycolide) (PLGA) and poly(ethylene vinyl acetate) (PEVA) forms a homogeneous liquid in an organic solvent such as tetrahydrofuran, and a phase-separated PLGA/PEVA composite can be prepared from it by evaporating the organic solvent. Exploiting this phenomenon, we designed a novel method…
The goal of this paper was to establish the durability profile of antibacterial multilayer thin films under storage and usage conditions. Thin films were built on stainless steel (SS) by means of a layer-by-layer process alternating a negatively charged polyelectrolyte, polyacrylic acid, with a cationic antibacterial…