Temat: magnetic particles - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Implantation of superabsorbent polymer by magnetic iron oxide particles
Autorzy:: Grzesiak, Maciej
Szajnecki, Łukasz
Powiązania:: https://bibliotekanauki.pl/articles/2079886.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:: superabsorbents
hydrogels
magnetic particles
swelling properties
Opis:: The aim of this research was to optimise methods of magnetic particles of iron oxides implantation into superabsorbent polymer based on partially neutralized acrylic acid (SAc/AAc) crosslinked with ethylene glycol dimethacrylate (EGDMA). The structure of the obtained materials was confirmed by infrared spectroscopic analysis (FT-IR/ATR). The quality of implantation process was evaluated on the basis of microscopy images. Swelling properties of the obtained implanted materials were also determined.
Źródło:: Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2019, 74, 2; 101-113
2083-358X
Pojawia się w:: Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Impact of magnetic particles concentration in ferrooil on its magnetic susceptibility coefficient χ
Autorzy:: Frycz, M.
Anioł, A.
Powiązania:: https://bibliotekanauki.pl/articles/241625.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ferro-oil
magnetic particles concentration
magnetic susceptibility coefficient
Opis:: The purpose of this article is to determine the effect of the concentration of magnetic particles in ferro-oil on the value of its magnetic susceptibility coefficient χ. Determination of the flow and operating parameters of slide journal bearings lubricated with ferro-oils requires, inter alia, designation the first magnetization N and the magnetic induction B vector components, dependent on the magnetic propertis of the lubricant. The fundamental problem lies in the inability to make direct accurate measurement of magnetic induction in the lubricating gap of slide bearing and its solution is to determine it on the analytical and numerical way. A key issue for the accuracy of such solutions is to obtain reasonably accurate values of magnetic susceptibility χ. This article attempts to determine these values and estimate their relationship with the concentration of magnetic particles concentration in ferro-oil being potential lubricant above-mentioned bearings. In this paper, the authors present the characteristic of experimental test benches to determine the coefficients of the magnetic susceptibility. They present method of determining this value from obtained measurement data and analyse the impact of the magnetic particles concentration in ferro-oil on its magnetic susceptibility values. Tests were performed for selected concentrations of magnetic particles in ferro-oil ranging: 2%, 4%, 6% and 8% and the tested ferro-oil was product from Unterensingen FerroTec Company (Germany) which is a mixture of colloidal mineral engine oil LongLife Gold Penzzoil class SAE 15W-40 with addition of Fe3O4 magnetic particles and a surfactant.
Źródło:: Journal of KONES; 2014, 21, 4; 111-117
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The ferro-oils viscosity depended simultaneously on the temperature and magnetic oil particles concentration η = η(t,ϕ). Part 2
Autorzy:: Frycz, M.
Powiązania:: https://bibliotekanauki.pl/articles/243733.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ferro-oil
dynamic viscosity
magnetic particles concentration
Opis:: The purpose of this article is to determine and describe the viscosity characteristics of the ferro-oils at context of temperature changes depend on different concentrations of magnetic particles. These characteristics were determined for the following test conditions: atmospheric pressure, constant shear rate and absent of an external magnetic field. In Part I of the paper there was determined and described four mathematical-physical models of fittings of the viscosity characteristics: exponential, fourth-degree polynomial and two homographic models – second- and third-degree. In present Part II of the paper above mentioned models have been developed. That has been done their depending on parameter of concentrations of magnetic particles ϕ in ferro-oil. There have been also undertaken comparison of the accuracy of estimation of reached results by selected mathematical models as well as these results have been rated according to their compliance with theoretical assumptions. Tests were performed for selected concentrations of magnetic particles in ferro-oil ranging: 1%, 2%, 4%, 6% and 8%. Tested ferro-oil was product from Unterensingen FerroTec Company (Germany) which is a mixture of colloidal mineral engine oil LongLife Gold Pennzoil class SAE 15W-40 with addition of Fe3O4 magnetic particles and a surfactant. Analysis of the results, identifying and fitting of characteristics has been made by means of software StatSoft STATISTICA ver. 9.1. The obtained characteristics going to be used by author in his future work to build mathematical models of viscosity changes of ferro-oils in the aspect of changes of parameters such as temperature, pressure, shear rate and the value of the external magnetic field. The determined parameters of physical properties will be used in analytical and numerical studies of flow and operating parameters of slide journal bearings lubricated with ferro-oils.
Źródło:: Journal of KONES; 2016, 23, 3; 127-134
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The ferro-oils viscosity depended simultaneously on the temperature and magnetic oil particles concentration η = η(t,ϕ). Part 1
Autorzy:: Frycz, M.
Powiązania:: https://bibliotekanauki.pl/articles/243457.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ferro-oil
dynamic viscosity
magnetic particles concentration
Opis:: The purpose of this article is to determine, identify and describe the viscosity characteristics of the ferro-oil with different concentrations of magnetic particles at context of temperature changes. These characteristics were determined for the following test conditions: atmospheric pressure, constant shear rate and absent of an external magnetic field. Tests were performed for selected concentrations of magnetic particles in ferro-oil ranging: 1%, 2%, 4%, 6% and 8%. Tested ferro-oil was product from Unterensingen FerroTec Company (Germany) which is a mixture of colloidal mineral engine oil LongLife Gold Penzzoil class SAE 15W-40 with addition of Fe3O4 magnetic particles and a surfactant. Analysis of the results, identifying and fitting of characteristics has been made by means of software StatSoft STATISTICA ver.9.1. There has been also undertaken comparison of the accuracy of estimation of reached results by selected mathematical models as well as these results have been rated according to their compliance with theoretical assumptions. Moreover, the waveform parameters of functions have been determined and their assessed quality has been done also. The obtained characteristics going to be used by author in his future work to build mathematical models of viscosity changes of ferro-oils in the aspect of changes of parameters like temperature, pressure, shear rate and the value of the external magnetic field. The determined parameters of physical properties will be used in analytical and numerical studies of flow and operating parameters of slide journal bearings lubricated with ferro-oils.
Źródło:: Journal of KONES; 2016, 23, 2; 113-120
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Vorticity transport analysis in magnetic viscoelastic fluid
Autorzy:: Kumar, P.
Mohan, H.
Hoshoudy, G.
Powiązania:: https://bibliotekanauki.pl/articles/281534.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Rivlin-Ericksen viscoelastic fluid
suspended magnetic particles
vorticity
Opis:: Results of investigation on the transport of vorticity in Rivlin-Ericksen viscoelastic fluid in the presence of suspended magnetic particles is presented here. Equations governing the transport of vorticity in Rivlin-Ericksen viscoelastic fluid in the presence of suspended magnetic particles are obtained from the equations of magnetic fluid flow. From these equations it follows that the transport of solid vorticity is coupled with the transport of fluid vorticity. Further, we find that because of thermokinetic process, fluid vorticity may exist in the absence of solid vorticity, but when fluid vorticity is zero, then solid vorticity is necessarily zero. A two-dimensional case is also studied and found that the fluid vorticity is indirectly influenced by the temperature and the magnetic field gradient.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 127-133
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Models of viscosity characteristics η=η(b) of ferro-oil with different concentration of magnetic particles in the presence of external magnetic field
Autorzy:: Frycz, M.
Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/244776.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ferro-oil
dynamic viscosity
magnetic particles concentration
external magnetic field
Opis:: The purpose of this article is to determine, identify and describe the viscosity characteristics of the ferro-oil with different concentrations of magnetic particles in the presence of an external magnetic field interaction. These characteristics are defined in the context of magnetic induction changes. These rheological tests were performed on a Physica MCR 301 rheometer. It was used a measuring system ‘plate to plate’ type which was armed with magneto-rheological research system MRD 180/1T. The tests were performed for the selected temperature of the medium i.e. 90°C, the shear rate θ changes were carried from 0 to 1000 1/s. Changes of the magnetic field intensity value were ranged from 0 to 500 mT. The selected concentrations of magnetic particles in a ferro-oil were 1%, 2%, 4%, 6% and 8% and the tested ferro-oil was product of FerroTec of Unterensingen (Germany), which is a mixture of colloidal mineral motor oil Penzzoil’s LongLife Gold's SAE 15W-40 with Fe3O4 magnetic particles and the surfactant. Analyses of the results, identify and matching characteristic were calculated using STATISTICA software. It has been proposed three categories of functions mapping the waveforms of the results obtained experimentally: the exponential function, logarithmic with basis of the normal and the polynomial function.
Źródło:: Journal of KONES; 2014, 21, 4; 119-126
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Fully coupled multi-physics modeling of the multi-type magnetic particles dynamic behavior in low intensity magnetic separator
Autorzy:: Wang, Feiwang
Zhao, Hongming
Dai, Huixin
Du, Wuxing
Powiązania:: https://bibliotekanauki.pl/articles/109730.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: multi-physics model
low-intensity magnetic separator
magnetic particles
dynamic behaviour
Opis:: Studying the dynamic behavior of magnetic particle suspensions in the low intensity magnetic separator has important implications for various mineral beneficiation processes. A new approach for fully coupled multi-physics modeling of the dynamic behavior of multi-type magnetic particles (MTMPs) is developed in the study. In this model, the particle tracing module is employed to identify and determine individual particle trajectories in the fluid and magnetic field, which are modelled through the COMSOL Multiphysics. The results show that the different arrangements of the permanent magnet assembly and the volume percentage of interlocked particles affect the dynamic behavior of MTMPs and the efficiency of the separation. The model is compared with experiments and the particle capture theory and the correctness of the solution obtained from COMSOL is demonstrated. The model gives new possibilities to control, optimise, and develop the process of LIMS.
Źródło:: Physicochemical Problems of Mineral Processing; 2019, 55, 1; 163-172
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Nanokompozyt poly(ε-kaprolakton)/tlenki żelaza dla zastosowań medycznych
Poly(ε-caprolactone)/iron oxides nanocomposite for medical applications
Autorzy:: Świętek, M.
Gwizdała, J.
Tokarz, W.
Menaszek, E.
Błażewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/285834.pdf
Data publikacji:: 2014
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: magnetyczne nanokompozyty
polimery
magnetyt
cząstki magnetyczne
magnetic nanocomposites
polymer
magnetite
magnetic particles
Opis:: Nanokompozyty polimerowe stanowią szeroką grupę materiałów znajdujących zastosowanie zarówno w wielu gałęziach przemysłu, jak i w medycynie. Fenomen nanokompozytów związany jest z łatwością modyfikacji ich cech materiałowych będących pochodną właściwości zarówno samego polimeru, jak i zastosowanego nanododatku. Pozwala to na projektowanie oraz wytwarzanie materiałów o określonej charakterystyce, adresowanych do konkretnych potrzeb. Celem niniejszej pracy było otrzymanie oraz charakterystyka polimerowych nanokompozytów o właściwościach magnetycznych. Jako osnowę polimerową wykorzystano biozgodny i bioresorbowalny poli(ε-kaprolakton), do którego wprowadzono cząstki magnetytu znajdujące się w dyspersji nanometrycznej. Do przygotowania materiałów zastosowano prostą metodę odlewania filmu/odparowania rozpuszczalnika. W celu zbadania wpływu zawartości nanododatku na właściwości nanokompozytu przygotowano serię materiałów różniących się od siebie ilością wprowadzonych do matrycy polimerowej cząstek magnetycznych (0; 0,5; 1 oraz 2%). Charakterystyka nanokompozytów obejmowała badania własności magnetycznych i powierzchniowych materiałów oraz ocenę ich degradacji oraz biozgodności. Pętle histerezy wprowadzonego do matrycy polimerowej nanododatku oraz otrzymanych nanokompozytów wykazywały przebieg typowy dla multidomenowych materiałów ferrimagnetycznych. Zaobserwowano, że istnieje korelacja pomiędzy wartością namagnesowania nasycenia oraz remanencją, a zawartością cząstek magnetycznych w nanokompozycie. Na podstawie obserwacji mikroskopowych stwierdzono, że część wprowadzonych cząstek magnetycznych ulega aglomeracji, reszta zaś pozostaje w dyspersji nanometrycznej. Wytworzone materiały nie wykazały toksycznego wpływu na komórki (Normal Human Osteoblast), co pozwala sądzić, że otrzymane nanokompozyty mogłyby zostać wykorzystane w medycynie.
Polymer nanocomposites are a wide group of materials which have applications in many branches of industry as well as in medicine. The phenomenon of nanocomposites is associated with simplicity of modification of their features, which are derived from properties of both the polymer matrix and the nanoadditive. This property enables to design and fabricate materials with strictly defined characteristics, addressed to specific needs. The aim of the presented studies was fabrication and characterization of polymer nanocomposites with magnetic properties. As a polymer matrix, a biocompatible and bioresorbable poly(ε-caprolactone) was used. Magnetite powder with nanometer-sized grain fraction was introduced into the polymer matrix as a magnetic nanoadditive. As a fabrication method casting film/solvent evaporation was applied. In order to examine how amount of magnetic nanoadditive influences the properties of nanocomposites, the series of materials with various concentrations of magnetic particles was prepared (0, 0.5, 1 and 2%). Characterization of materials included magnetic and surface properties investigations as well as evaluation of degradability, and biocompatibility of the fabricated materials. Magnetic hysteresis loops of both the nanoadditive itself and the nanocomposite demonstrate curves typical for multi-domain ferromagnetic materials. Existence of the correlation between the values of magnetic saturation and remanence, and the content of magnetic particles has been observed. Microscopic evaluations have shown that small part of magnetic particles has tendency to agglomerate but the rest remains in nanometric dispersion. For the fabricated materials no cytotoxic influence on the cells was observed (Normal Human Osteoblast). This suggests that obtained nanocomposites could find application in medicine.
Źródło:: Engineering of Biomaterials; 2014, 17, 127; 22-32
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Effect of the magnetic particles concentration on the ferro-oil’s dynamic viscosity in presence of an external magnetic field in the aspect of temperature changes
Autorzy:: Czaban, A.
Frycz, M.
Horak, W.
Powiązania:: https://bibliotekanauki.pl/articles/247080.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ferro-oil
dynamic viscosity
magnetic particles concentration
temperature changes
external magnetic field
Opis:: There is presented an effect of the changes of the concentration of magnetic particles included in the ferro-oil on its dynamic viscosity in the presence of external magnetic field in this paper. The study was conducted in the context of temperature’s changes. The authors assume that the concentration of magnetic particles in ferro-oil can significantly affects its basic physical properties as dynamic viscosity, as well as the operational properties of journal sliding bearings ferro-oil’s lubricated. The equally significant as the above mentioned properties may affect the external environmental conditions of operation, especially temperature changes. In this context, an important technique’s issue appears to determine the principles of selection of optimal concentration of above mentioned particles according to the existing environmental conditions of its operation, or the expectations laid against the operation of the devices. Rheological studies were carried out on Physica MCR 301 rheometer in the “plate-to-plate” measurement system with an adapter to magneto-rheological studies MRD 180/1T. Thermal stabilization was carried out by a water jacket in a closed chamber and controlling the nature of the magnetic field was conducted by current’s changes. Tests were performed for four selected temperature range of 60º, 70º, 80º and 90ºC as regards changes an external magnetic field intensity 0-700 mT. The selected concentrations of magnetic particles in a ferro-oil were 1, 2, 4, 6 and 8%.
Źródło:: Journal of KONES; 2013, 20, 2; 55-60
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Effect of the magnetic particles concentration on the ferro-oil’s dynamic viscosity in presence of an external magnetic field in the aspect of shear rate’s variations
Autorzy:: Frycz, M.
Horak, W.
Powiązania:: https://bibliotekanauki.pl/articles/246160.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ferro-oil
dynamic viscosity
magnetic particles concentration
rheometer
slide journal bearings
Opis:: The purpose of this study is to determine the effect of changes in the concentration of magnetic particles in ferrooil to change its physical properties, in particular the dynamic viscosity in a constant external magnetic field in terms of changes in shear rate and changes in the intensity of that field. Rheological studies were carried out on Physica MCR 301 rheometer in the “plate -plate” measurement system with an adapter to magneto-rheological studies MRD 180/1T. The applied adapter enable to obtain almost homogeneous distribution of magnetic field strength. Thermal stabilization was carried out by a water jacket in a closed chamber and controlling the nature of the magnetic field was conducted by current’s changes. Tests were performed for shear rate’s changes from 0 to 1000 1/s as regards changes an external magnetic field intensity 0–700 mT. The selected concentrations of magnetic particles in a ferro-oil were 1, 2, 4, 6 and 8% and the tested ferrofluid was product of FerroTec of Unterensingen (Germany), which is a mixture of colloidal mineral motor oil Penzzoil’s LongLife Gold's SAE 15W-40 with Fe3O4 magnetic particles and the surfactant. The paper presents, in the form of graphs, the changes of ferro-oil’s dynamic viscosity as a function of shear rate and concentration of magnetic particles in the aspect of external magnetic field’s intensity changes. The results of research were also subjected to analysis. The obtained characteristics of ferro-oil’s viscosity show clear evidence of non-Newtonian properties of the liquids. There is observed progression of these properties with increasing of magnetic particles concentration. This fact indicates the essential effect of the addition mentioned particles to the change of the ferro-oil’s viscosity characteristics.
Źródło:: Journal of KONES; 2013, 20, 3; 139-144
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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