Analyzing the Conditions for the Electrolytic Formation of Ensembles from Metal Nanowires in the Pores of Track Membranes

Theoretical Foundations of Chemical Engineering - The effect of the electrolyte composition, mass-transfer conditions, pore diameter, interpore distance, and electric parameters on the formation of...     

Magnetic Force Microscopy of Iron and Nickel Nanowires Fabricated by the Matrix Synthesis Technique

Iron and nickel nanowires are grown by the matrix synthesis technique in the pores of the track membrane fabricated based on polyethylene terephthalate (PET). Scanning electron microscopy (SEM) and atomic force microscopy (AFM) are used to image the pores on the surface of the specimens and determine the 3d metal nanowires in a polymer bulk. The magnetization curves of the arrays of the nanowires are obtained. Magnetic properties of the nanowires are studied by the magnetic force microscopy (MFM) methods. The influence of the interposition and magnetostatic interaction of the nanowires of the magnetic metals in the polymer membrane, as well as the magnitudes and orientation of the applied external magnetic field, on the obtained MFM images is shown. The simulation results of the MFM images are in good agreement with the experimental data.     

Rayleigh-Taylor instability of viscoplastic liquid

The Rayleigh-Taylor instability of viscoplastic medium (VPM) is considered, which medium corresponds to real VPM or to the high-temperature limit of highly elastic-viscoplastic fluids. An effective rheological model is provided by the Bingham-Shvedov model (BSM) which is similar to the dry friction model in the mechanics of deformable solid. The main feature of BSM is the existence of yield stress corresponding to dry friction limit. Well-known in the literature is the solution for round pipe flow of BSM, in the case of which the presence of yield stress causes the emergence of a moving core at the center of flow. It is the prime objective of this study to construct a numerical model of three-dimensional flow of BSM in the gravity field, which is accompanied by a nonlinear stage of development of instability of VPM, and to analyze the correlation between the development of instability and yield stress.