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1

Influence of thermal diffusion on MHD radiating flow in presence of Cu-nanoparticles, Casson fluid and angle of inclination

Brahma-Chary S., Jayarami-Reddy K., Kashaiah K.

Journal of Applied Mathematics and Computational Mechanics

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2020

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Vol. 19, nr 2

43--58

EN

In this study numerical solutions for magnetohydrodynamic transfer, thermal and mass instability, free convection flow through the plate before Casson fluid, heat dissipation, thermal radiation, heat sink, chemical reaction, tilt angle, and saturated porous medium were described. The effectiveness of this study is to analyze the effect of heat diffusion, Casson fluid, the angle of interest on the flow phenomenon of Cu-nanoparticles in the presence of thermal radiation, heat source/heat sink, destructive reaction, heat transfer and mass transfer in a simple way. The finite difference method was used to solve the governing equations which are the added partial differential equations. The effects of different material parameters on velocity, temperature and concentration profiles are explained using graphs and tables. The results are compared with previously published papers and a very good agreement is found. In the boundary layer region, fluid velocity decreases with the increasing values of magnetic field parameter, heat source/sink, Casson fluid, angle of inclination and thermal radiation parameter for Cu-nanoparticles. Also it is noticed that the solutal boundary layer thickness decreases with an increase in the chemical reaction parameter. It is because chemical molecular diffusivity reduces for higher values of Kr.

2

Obtaining copper nanoparticles from nanocomposites of poly(vinyl alcohol) matrix

Dobrzański L. A., Nieradka-Buczek B.

Journal of Achievements in Materials and Manufacturing Engineering

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2015

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Vol. 72, nr 2

85--92

EN

Purpose: In this paper the development of technology for production of copper nanoparticles by thermal debinding matrix nanocomposite polymer nanofibers with reinforced of copper was reported. Electrospinning technique was used to synthesis composite nanofibers using a precursor composed of poly(vinyl alcohol) (PVA), copper acetate (CuAC) and acetic acid (C2H3OH). The resulting nanofiber was subjected to a high temperature in order to debinding of the organic part. The aim of this study was to attempt to obtain a one-dimensional nanostructured materials. Design/methodology/approach: The resulting nanostructures have been characterized using high resolution scanning electron microscopy (SEM). The influence of debinding conditions on one-dimensional nanostructured materials was observed. Research was execute on scanning electron microscope. Findings: On the basis of carried out researches the impact of the debinding of nanocomposite polymer nanofibers on the diameter of obtained nanostructures have been shown. The influence of debinding conditions on composite nanofibers were determined. Research limitations/implications: The research was carried out on technological variants, not on final elements. Originality/value: The paper presents attempt to obtain a one-dimensional nanostructured materials.

3

Effect of nanowires and nanoparticles of copper on the structure and properties of the nanocomposite polymeric materials

Dobrzański L. A., Czaja I.

Archives of Materials Science and Engineering

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2015

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Vol. 75, nr 1

18--29

EN

Purpose: The main aim of this paper is to investigate the impact of nano-reinforcements in the form of Cu nanowires and Cu nanopowder on the structure and properties of polymeric composite materials Design/methodology/approach: Developed in this paper of nanocomposite materials reinforced with Cu nanopowders and Cu nanowires they have shown the ability to carry an electrical charge, which was confirmed by testing resistivity and resistance to electrical breakdown Findings: Research surface area of reinforce the material showed that the copperdimensional nanowires an attractive material for the strengthening of polymeric composite materials. Because of their shape and dimensions, the formation of percolation paths necessary for electrical charge in the insulating matrix, are a better material reinforcement of copper nanopowder Research limitations/implications: The phenomenon of current conduction through the polymer composite materials is an important property due to the use of these materials Originality/value: The paper presents the effect of the addition of one-dimensional nanowires of copper into the insulating matrix epoxy resin allowing electrical conductivity produced in this way, polymeric materials nanocomposites

4

Influence of the electrospinning parameters on the morphology of composite nanofibers

Dobrzański L., Nieradka B., Macek M., Matysiak W.

Archives of Materials Science and Engineering

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2014

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Vol. 69, nr 1

32--37

EN

Purpose: In the paper the fabrication of composite nanofibers using electrospinning Technique was reported. That processing technique was used to synthesis composite Nanofibers with various morphologies using a precursor composed of poly(vinyl) alcohol (PVA), copper acetate (CuAC) and acetic acid (C2H3OH). The morphology of formed Nanofibers depends not only on the spinning parameters, but also on the composition of the Polymer solution. The purpose of the study was to obtain results that allowed to determine The influence of parameters of the electrospinning process on morphology of the composite Nanofibers. Design/methodology/approach: The obtained nanofibers were characterized through High resolution scanning electron microscopy (SEM). It was noticed that the morphology Of composite nanofibers depends on the applied voltage and nozzle-collector distance. The research was carried on a scanning electron microscope. Findings: The influence of parameters of the electrospinning process on morphology of the Composite nanofibers was determined. Research limitations/implications: The research was carried out on samples, not on Final elements. Originality/value: The paper presents the influence of the electrospinning parameters On the morphology of composite nanofibers.