Materials Literature
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We examine the origin of the electrostatic attraction between nanoparticle (NP) and cells by synthesizing a NP array with a continuous change in surface charge density (SCD). This attraction does not show a linear and continuous change, but a sharp increase as the positive SCD increases. The results of zeta potential…
BACKGROUND: The purpose of this study was to develop novel sandwich-structured nanofibrous membranes to provide sustained-release delivery of vancomycin, gentamicin, and lidocaine for repair of infected wounds. METHODS: To prepare the biodegradable membranes, poly(D, L)-lactide-co-glycolide (PLGA), collagen, and vario…
Iron oxide nanoparticles (IONPs) were synthesized by coprecipitation of iron salts in alkali media followed by coating with glycol chitosan (GC-coated IONPs). Both bare and GC-coated IONPs were subsequently characterized and evaluated for their antibacterial activity. Comparison of Fourier transform infrared spectra a…
A study on the dielectric spectroscopy of epoxy-based nanocomposites filled with different types of particles, such as Al2O3, AlN, MgO, SiO2and BN, is presented. The surface of the nanoparticles was modified with a silane coupling agent, in order to make them compatible with the organic host and create a system with h…
BACKGROUND: Amorphous silica nanoparticles (SiNP) can be used in medical technologies and other industries leading to human exposure. However, an increased number of studies indicate that this exposure may result in cardiovascular inflammation and damage. A high ratio of nitric oxide to peroxynitrite concentrations ([…
We simulate the homogeneous nucleation of ice from supercooled liquid water at 220 K in the isobaric-isothermal ensemble using the MW monatomic water potential. Monte Carlo simulations using umbrella sampling are performed in order to determine the nucleation free energy barrier. We find the Gibbs energy profile to be…
Using nanoparticles to deliver chemotherapeutics offers new opportunities for cancer therapy, but challenges still remain when they are used for the delivery of multiple drugs, especially for the synchronous delivery of hydrophilic and hydrophobic drugs in combination therapies. In this paper, we developed an approach…
It is shown by analytical calculation based on the tight-binding approximation that the isotropic Dirac cone in the Brillouin zone center can be created in two- and three-dimensional periodic metamaterials by accidental degeneracy of two modes. In the case of two dimensions, the combination of a doubly degenerate E mo…
Electrospinning is an exciting technique attracting more and more attention as a potential solution to the current challenges in the field of tissue engineering. This technique can be used to produce fibrous scaffolds with excellent biocompatibility and biodegradability, as well as suitable micro-/nanostructure to ind…
The hot weld metal grinding of the cylindrical parts with soft and medium-soft wheels is investigated. Work-time wheel wear charts and grinding cutting force diagrams received through the test and calculation data are offered. Applicable equations for the cutting forces occurring in the wheel — workpiece interaction,…
Some questions on the psychological and pedagogical conditions of the information educational environment functioning for training humanists through the example of learning mathematics and computer science are considered. The components of the information educational environment are specified. The psychological educat…
Some results of the opinion survey conducted with the aim of studying attitude of the civil servants towards the civil service reforming processes, the formation of the civil service management system, and of revealing the interrelations between the functioning of civil service management system and the changing of th…
It is proved that space is strongly notmed, and is neither strongly notmed, nor uniformly convex. A standard form of the linear functionals over space and over metric spaces of 0 < p £ 1, is determined.
The synthesis technique of ultrathin films on sapphire by laser ablation, and the results of their study by the atomic force microscopy (AFM) method are stated.
Features of the mathematical modeling of drilling tools modernized for drilling deep holes are studied. A mathematical model of drilling, questions of stability, and existence of the drilling process are considered.
The evolution factor of the modern industrial civilization is considered. Special attention is paid to the culturological and philosophical analysis of the influence of machinery on the world outlook of the modern person. The philosophical reflection on the role of the machinery and technical knowledge, as well as on…
Various approaches to increasing the accounting and analytic information quality through improving the efficiency of the accounting processes are described. It is shown that the continuous improvement of the processes is carried out with the use of benchmarking. It is offered to select specified groups in the benchmar…
The statistical analysis of the deviations of the outer and inner bearing race profiles of the cylinder grinding machines is resulted. The patterns of forming vibration spectra of the bearings of the same series and standard size, which designate the option of the practical recommendations on reducing noise levels of…
Some problems on disassembling fixed demountable joints by oscillations forced by the waveguide are considered. The obtained results of the study characterizing the relationship between the used scheme of the vibro-loading, the target exposure period, and the disassembly efficiency are shown.
A novel evaluation method was developed for Raman microscopic quantitative characterization of polymer waste. Car shredder polymer waste was divided into different density fractions by magnetic density separation (MDS) technique, and each fraction was investigated by Raman mapping, which is capable of detecting the co…