Ferrofluids: Properties and Applications
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Magnetic Fields Magnetism Magnetic Field
PHY2061 Enriched Physics 2 Lecture Notes Magnetic Fields Magnetic Fields Disclaimer: These lecture notes are not meant to replace the course textbook. The content may be incomplete. Some topics may be unclear. These notes are only meant to be a study aid and a supplement to your own notes. Please report any inaccuracies to the professor. Magnetism Is ubiquitous in every-day life! • Refrigerator magnets (who could live without them?) • Coils that deflect the electron beam in a CRT television or monitor • Cassette tape storage (audio or digital) • Computer disk drive storage • Electromagnet for Magnetic Resonant Imaging (MRI) Magnetic Field Magnets contain two poles: “north” and “south”. The force between like-poles repels (north-north, south-south), while opposite poles attract (north-south). This is reminiscent of the electric force between two charged objects (which can have positive or negative charge). Recall that the electric field was invoked to explain the “action at a distance” effect of the electric force, and was defined by: F E = qel where qel is electric charge of a positive test charge and F is the force acting on it. We might be tempted to define the same for the magnetic field, and write: F B = qmag where qmag is the “magnetic charge” of a positive test charge and F is the force acting on it. However, such a single magnetic charge, a “magnetic monopole,” has never been observed experimentally! You cannot break a bar magnet in half to get just a north pole or a south pole. As far as we know, no such single magnetic charges exist in the universe, D. -
Animafluid: a Dynamic Liquid Interface
Animafluid: A Dynamic Liquid Interface Muhammad Ali Hashmi Heamin Kim Abstract 75 Amherst St. 75 Amherst St. In this paper the authors describe a new tangible liquid interface based on ferromagnetic fluid. Our interface Cambridge, Cambridge, combines properties of both liquid and magnetism in a MA 02139 USA MA 02139 USA single interface which allows the user to directly [email protected] [email protected] interact with the liquid interface. Our dynamic liquid interface, which we call Animafluid, uses the physical Artem Dementyev Amir Lazarovich qualities of ferromagnetic fluids in combination with 75 Amherst St. 75 Amherst St. pressure sensors, microcontrollers for real-time Cambridge, Cambridge, interaction that combines both physical input and output. Our implementation is different from existing MA 02139 USA MA 02139 USA ferrofluid interventions and projects that harness [email protected] [email protected] magnetic liquid properties of ferromagnetic fluids in the sense that it adds tangibility of radical atoms design methodology to ferromagnetic fluids, thereby changing Hye Soo Yang the scope of interaction with the ferromagnetic fluid in 75 Amherst St. a drastic manner. Cambridge, MA 02139 USA Author Keywords [email protected] Tangible Interface; Ferrofluid; Dynamic Liquid Interface; Radical Atoms; Programmable Materiality ACM Classification Keywords H.5.2. Information interfaces and Presentation; User Interfaces Introduction Copyright is held by the author/owner(s). Ferromagnetic liquid is a material that has magnetic CHI’13, April 27 – May 2, 2013, Paris, France. and liquid properties. Ferromagnetic fluids have been used in a variety of different ways in the field of fluid dynamics. Our implementation imparts tangibility to the Prior Work liquid interface thus providing the design features of Our work is informed by prior work done on “Radical Atoms”, which envisions human interactions electromagnets-based interfaces and ferromagnetic with dynamic materials in a computationally fluids. -
Determining the Flow Curves for an Inverse Ferrofluid
Korea-Australia Rheology Journal Vol. 20, No. 1, March 2008 pp. 35-42 Determining the flow curves for an inverse ferrofluid C. C. Ekwebelam and H. See* The School of Chemical and Biomolecular Engineering, The University of Sydney, Australia. NSW 2006 (Received Oct. 9, 2007; final revision received Jan. 30, 2008) Abstract An inverse ferrofluid composed of micron sized polymethylmethacrylate particles dispersed in ferrofluid was used to investigate the effects of test duration times on determining the flow curves of these materials under constant magnetic field. The results showed that flow curves determined using low duration times were most likely not measuring the steady state rheological response. However, at longer duration times, which are expected to correspond more to steady state behaviour, we noticed the occurrence of plateau and decreasing flow curves in the shear rate range of 0.004 s−1 to ~ 20 s−1, which suggest the presence of non- homogeneities and shear localization in the material. This behaviour was also reflected in the steady state results from shear start up tests performed over the same range of shear rates. The results indicate that care is required when interpreting flow curves obtained for inverse ferrofluids. Keywords : inverse ferrofluid, flow curve, shear localization 1. Introduction An IFF comprises a magnetisable carrier liquid, otherwise known as a ferrofluid, which is a colloidal dispersion of Field-responsive fluids are suspensions of micron-sized nano-sized magnetite particles. Into this we disperse particles which show a dramatic increase in flow resistance micron-sized non-magnetic solid particles, thereby pro- upon application of external magnetic or electrical fields. -
Chapter 7 Magnetism and Electromagnetism
Chapter 7 Magnetism and Electromagnetism Objectives • Explain the principles of the magnetic field • Explain the principles of electromagnetism • Describe the principle of operation for several types of electromagnetic devices • Explain magnetic hysteresis • Discuss the principle of electromagnetic induction • Describe some applications of electromagnetic induction 1 The Magnetic Field • A permanent magnet has a magnetic field surrounding it • A magnetic field is envisioned to consist of lines of force that radiate from the north pole to the south pole and back to the north pole through the magnetic material Attraction and Repulsion • Unlike magnetic poles have an attractive force between them • Two like poles repel each other 2 Altering a Magnetic Field • When nonmagnetic materials such as paper, glass, wood or plastic are placed in a magnetic field, the lines of force are unaltered • When a magnetic material such as iron is placed in a magnetic field, the lines of force tend to be altered to pass through the magnetic material Magnetic Flux • The force lines going from the north pole to the south pole of a magnet are called magnetic flux (φ); units: weber (Wb) •The magnetic flux density (B) is the amount of flux per unit area perpendicular to the magnetic field; units: tesla (T) 3 Magnetizing Materials • Ferromagnetic materials such as iron, nickel and cobalt have randomly oriented magnetic domains, which become aligned when placed in a magnetic field, thus they effectively become magnets Electromagnetism • Electromagnetism is the production -
Chapter 22 Magnetism
Chapter 22 Magnetism 22.1 The Magnetic Field 22.2 The Magnetic Force on Moving Charges 22.3 The Motion of Charged particles in a Magnetic Field 22.4 The Magnetic Force Exerted on a Current- Carrying Wire 22.5 Loops of Current and Magnetic Torque 22.6 Electric Current, Magnetic Fields, and Ampere’s Law Magnetism – Is this a new force? Bar magnets (compass needle) align themselves in a north-south direction. Poles: Unlike poles attract, like poles repel Magnet has NO effect on an electroscope and is not influenced by gravity Magnets attract only some objects (iron, nickel etc) No magnets ever repel non magnets Magnets have no effect on things like copper or brass Cut a bar magnet-you get two smaller magnets (no magnetic monopoles) Earth is like a huge bar magnet Figure 22–1 The force between two bar magnets (a) Opposite poles attract each other. (b) The force between like poles is repulsive. Figure 22–2 Magnets always have two poles When a bar magnet is broken in half two new poles appear. Each half has both a north pole and a south pole, just like any other bar magnet. Figure 22–4 Magnetic field lines for a bar magnet The field lines are closely spaced near the poles, where the magnetic field B is most intense. In addition, the lines form closed loops that leave at the north pole of the magnet and enter at the south pole. Magnetic Field Lines If a compass is placed in a magnetic field the needle lines up with the field. -
Revision Pack Topic 7- Magnetism & Electromagnetism
Revision Pack Topic 7- Magnetism & Electromagnetism Permanent and induced magnetism, magnetic forces and fields R/A/G Poles of a magnet The poles of a magnet are the places where the magnetic forces are strongest. When two magnets are brought close together they exert a force on each other. Two like poles repel each other. Two unlike poles attract each other. Attraction and repulsion between two magnetic poles are examples of non-contact force. A permanent magnet produces its own magnetic field. An induced magnet is a material that becomes a magnet when it is placed in a magnetic field. Induced magnetism always causes a force of attraction. When removed from the magnetic field an induced magnet loses most/all of its magnetism quickly. Magnetic fields The region around a magnet where a force acts on another magnet or on a magnetic material (iron, steel, cobalt and nickel) is called the magnetic field. The force between a magnet and a magnetic material is always one of attraction. The strength of the magnetic field depends on the distance from the magnet. The field is strongest at the poles of the magnet. The direction of the magnetic field at any point is given by the direction of the force that would act on another north pole placed at that point. The direction of a magnetic field line is from the north (seeking) pole of a magnet to the south (seeking) pole of the magnet. A magnetic compass contains a small bar magnet. The Earth has a magnetic field. The compass needle points in the direction of the Earth’s magnetic field. -
Numerical Simulations of Heat and Mass Transfer Flows Utilizing
CAPITAL UNIVERSITY OF SCIENCE AND TECHNOLOGY, ISLAMABAD Numerical Simulations of Heat and Mass Transfer Flows utilizing Nanofluid by Faisal Shahzad A thesis submitted in partial fulfillment for the degree of Doctor of Philosophy in the Faculty of Computing Department of Mathematics 2020 i Numerical Simulations of Heat and Mass Transfer Flows utilizing Nanofluid By Faisal Shahzad (DMT-143019) Dr. Noor Fadiya Mohd Noor, Assistant Professor University of Malaya, Kuala Lumpur, Malaysia (Foreign Evaluator 1) Dr. Fatma Ibrahim, Scientific Engineer Technische Universit¨atDortmund, Germany (Foreign Evaluator 2) Dr. Muhammad Sagheer (Thesis Supervisor) Dr. Muhammad Sagheer (Head, Department of Mathematics) Dr. Muhammad Abdul Qadir (Dean, Faculty of Computing) DEPARTMENT OF MATHEMATICS CAPITAL UNIVERSITY OF SCIENCE AND TECHNOLOGY ISLAMABAD 2020 ii Copyright c 2020 by Faisal Shahzad All rights reserved. No part of this thesis may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, by any information storage and retrieval system without the prior written permission of the author. iii Dedicated to my beloved father and adoring mother who remain alive within my heart vii List of Publications It is certified that following publication(s) have been made out of the research work that has been carried out for this thesis:- 1. F. Shahzad, M. Sagheer, and S. Hussain, \Numerical simulation of magnetohydrodynamic Jeffrey nanofluid flow and heat transfer over a stretching sheet considering Joule heating and viscous dissipation," AIP Advances, vol. 8, pp. 065316 (2018), DOI: 10.1063/1.5031447. 2. F. Shahzad, M. Sagheer, and S. Hussain, \MHD tangent hyperbolic nanofluid with chemical reaction, viscous dissipation and Joule heating effects,” AIP Advances, vol. -
Electricity and Magnetism Inductance Transformers Maxwell's Laws
Electricity and Magnetism Inductance Transformers Maxwell's Laws Lana Sheridan De Anza College Dec 1, 2015 Last time • Ampere's law • Faraday's law • Lenz's law Overview • induction and energy transfer • induced electric fields • inductance • self-induction • RL Circuits Inductors A capacitor is a device that stores an electric field as a component of a circuit. inductor a device that stores a magnetic field in a circuit It is typically a coil of wire. 782 Chapter 26 Capacitance and Dielectrics ▸ 26.2 continued Categorize Because of the spherical symmetry of the sys- ϪQ tem, we can use results from previous studies of spherical Figure 26.5 (Example 26.2) systems to find the capacitance. A spherical capacitor consists of an inner sphere of radius a sur- ϩQ a Analyze As shown in Chapter 24, the direction of the rounded by a concentric spherical electric field outside a spherically symmetric charge shell of radius b. The electric field b distribution is radial and its magnitude is given by the between the spheres is directed expression E 5 k Q /r 2. In this case, this result applies to radially outward when the inner e sphere is positively charged. 820 the field Cbetweenhapter 27 the C spheresurrent and (a R esistance, r , b). b S Write an expression for the potential difference between 2 52 ? S 782 Chapter 26 Capacitance and DielectricsTable 27.3 CriticalVb TemperaturesVa 3 E d s a the two conductors from Equation 25.3: for Various Superconductors ▸ 26.2 continued Material Tc (K) b b dr 1 b ApplyCategorize the result Because of Example of the spherical 24.3 forsymmetry the electric ofHgBa the sys 2fieldCa- 2Cu 3O8 2 52134 52 Ϫ5Q Vb Va 3 Er dr ke Q 3 2 ke Q Tl—Ba—Ca—Cu—O 125a a r r a outsidetem, wea sphericallycan use results symmetric from previous charge studies distribution of spherical Figure 26.5 (Example 26.2) systems to findS the capacitance. -
Magnetism in Transition Metal Complexes
Magnetism for Chemists I. Introduction to Magnetism II. Survey of Magnetic Behavior III. Van Vleck’s Equation III. Applications A. Complexed ions and SOC B. Inter-Atomic Magnetic “Exchange” Interactions © 2012, K.S. Suslick Magnetism Intro 1. Magnetic properties depend on # of unpaired e- and how they interact with one another. 2. Magnetic susceptibility measures ease of alignment of electron spins in an external magnetic field . 3. Magnetic response of e- to an external magnetic field ~ 1000 times that of even the most magnetic nuclei. 4. Best definition of a magnet: a solid in which more electrons point in one direction than in any other direction © 2012, K.S. Suslick 1 Uses of Magnetic Susceptibility 1. Determine # of unpaired e- 2. Magnitude of Spin-Orbit Coupling. 3. Thermal populations of low lying excited states (e.g., spin-crossover complexes). 4. Intra- and Inter- Molecular magnetic exchange interactions. © 2012, K.S. Suslick Response to a Magnetic Field • For a given Hexternal, the magnetic field in the material is B B = Magnetic Induction (tesla) inside the material current I • Magnetic susceptibility, (dimensionless) B > 0 measures the vacuum = 0 material response < 0 relative to a vacuum. H © 2012, K.S. Suslick 2 Magnetic field definitions B – magnetic induction Two quantities H – magnetic intensity describing a magnetic field (Système Internationale, SI) In vacuum: B = µ0H -7 -2 µ0 = 4π · 10 N A - the permeability of free space (the permeability constant) B = H (cgs: centimeter, gram, second) © 2012, K.S. Suslick Magnetism: Definitions The magnetic field inside a substance differs from the free- space value of the applied field: → → → H = H0 + ∆H inside sample applied field shielding/deshielding due to induced internal field Usually, this equation is rewritten as (physicists use B for H): → → → B = H0 + 4 π M magnetic induction magnetization (mag. -
Lecture 8: Magnets and Magnetism Magnets
Lecture 8: Magnets and Magnetism Magnets •Materials that attract other metals •Three classes: natural, artificial and electromagnets •Permanent or Temporary •CRITICAL to electric systems: – Generation of electricity – Operation of motors – Operation of relays Magnets •Laws of magnetic attraction and repulsion –Like magnetic poles repel each other –Unlike magnetic poles attract each other –Closer together, greater the force Magnetic Fields and Forces •Magnetic lines of force – Lines indicating magnetic field – Direction from N to S – Density indicates strength •Magnetic field is region where force exists Magnetic Theories Molecular theory of magnetism Magnets can be split into two magnets Magnetic Theories Molecular theory of magnetism Split down to molecular level When unmagnetized, randomness, fields cancel When magnetized, order, fields combine Magnetic Theories Electron theory of magnetism •Electrons spin as they orbit (similar to earth) •Spin produces magnetic field •Magnetic direction depends on direction of rotation •Non-magnets → equal number of electrons spinning in opposite direction •Magnets → more spin one way than other Electromagnetism •Movement of electric charge induces magnetic field •Strength of magnetic field increases as current increases and vice versa Right Hand Rule (Conductor) •Determines direction of magnetic field •Imagine grasping conductor with right hand •Thumb in direction of current flow (not electron flow) •Fingers curl in the direction of magnetic field DO NOT USE LEFT HAND RULE IN BOOK Example Draw magnetic field lines around conduction path E (V) R Another Example •Draw magnetic field lines around conductors Conductor Conductor current into page current out of page Conductor coils •Single conductor not very useful •Multiple winds of a conductor required for most applications, – e.g. -
Magnetic Fluid Rheology and Flows
Current Opinion in Colloid & Interface Science 10 (2005) 141 – 157 www.elsevier.com/locate/cocis Magnetic fluid rheology and flows Carlos Rinaldi a,1, Arlex Chaves a,1, Shihab Elborai b,2, Xiaowei (Tony) He b,2, Markus Zahn b,* a University of Puerto Rico, Department of Chemical Engineering, P.O. Box 9046, Mayaguez, PR 00681-9046, Puerto Rico b Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science and Laboratory for Electromagnetic and Electronic Systems, Cambridge, MA 02139, United States Available online 12 October 2005 Abstract Major recent advances: Magnetic fluid rheology and flow advances in the past year include: (1) generalization of the magnetization relaxation equation by Shliomis and Felderhof and generalization of the governing ferrohydrodynamic equations by Rosensweig and Felderhof; (2) advances in such biomedical applications as drug delivery, hyperthermia, and magnetic resonance imaging; (3) use of the antisymmetric part of the viscous stress tensor due to spin velocity to lower the effective magnetoviscosity to zero and negative values; (4) and ultrasound velocity profile measurements of spin-up flow showing counter-rotating surface and co-rotating volume flows in a uniform rotating magnetic field. Recent advances in magnetic fluid rheology and flows are reviewed including extensions of the governing magnetization relaxation and ferrohydrodynamic equations with a viscous stress tensor that has an antisymmetric part due to spin velocity; derivation of the magnetic susceptibility -
Make a Ferrofluid
Name: FFUNUN WWITHITH MAGNETS A Magnet that Drips: MAKING FERROFLUID A ferrofl uid is a special liquid with tiny magnetic particles fl oating around inside. Since these particles are attracted to each other, they must be coated with a special substance that prevents them from sticking together (so that the ferrofl uid remains fl uid). What makes ferrofl uid so special is that in the presence of an outside magnetic fi eld, each of the tiny particles becomes magnetized and the ferrofl uid condenses into a solid. In this activity you will be able to make and play with your own ferrofl uid and see how it behaves in the presence of a magnetic fi eld. WHAT YOU NEED: A bar magnet A napkin Vegetable Iron fi lings A shallow or sponge oil (from the hardware store) dish WHAT YOU’LL DO: Pour a bit of vegetable oil Pour iron fi lings into the 1. into a shallow dish, just 2. oil and mix the two until enough to make a thin they have become a thick, fi lm across the bottom. sludge-like material. This is your ferrofl uid! Use a napkin or sponge to absorb 3. any excess oil and allow the ferro- fl uid to become thicker. A good way to do this is to attach a magnet to the outside of the dish. This will solidify the fl uid and let you dab away extra oil. Turn over FFUNUN WWITHITH MAGNETS MAKINGDRAWING FERROFLUIDFIELD LINES Attach a magnet to the dish 4. containing the ferrofl uid; the fl uid will solidify and take the shape of the magnetic fi eld it is in! Removing the magnetic fi eld will allow the ferrofl uid to fl ow like a liquid again.