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Ferrofluids

01/09/20

by Nasrin Akbari

Introduction

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FILM

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Definition:

A ferrofluid is a specific type of liquid which responds to a magnetic field. Ferrofluids are composed of nanoscale magnetic particles suspended in a carrier fluid. The solid particles are generally stabilized with an attached surfactant layer. Ferrofluids are extremely stable meaning that they will not cluster together even in extremely strong magnetic fields

Classification:

1.surfacted (SFF), if the coating is a surfactant molecule

2.ionic (IFF), if it is an electric shell

MRF & FF?

Ferrofluids are different from the usual magnetorheological fluids (MRF) used for dampers, brakes and clutches, formed by micron sized particles dispersed in oil. In MRF the application of a magnetic field causes an enormous increase of the viscosity, so that, for strong enough fields, they may behave like a solid. On the other hand, a FF keeps its fluidity even if subjected to strong magnetic fields (» 10 kG).

1.https://www.slideserve.com/tan/ferrofluids

2.C. Scherer* and A. M. Figueiredo Neto(Received on 28 July, 2005).chemical sociey reviews

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https://www.slideserve.com/tan/ferrofluids

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History:

A process for making a ferrofluid was invented in 1963 by Steve Popple of NASA to create a liquid rocket fuel that, using a magnetic field, could eventually lead to a fuel pump in a weightless environment.

view-source:https://www.google.com/search?q=ferrofluid&oq=f&aqs=chrome.1.69i60j69i59l4j69i61j69i60l2.2600j0j7&sourceid=chrome&ie=UTF-8

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Synthesis of Magnetite Nanocrystals

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There are essentially two methods to prepare these nanoparticles, by size reduction [1] and chemical precipitation [6]. In size reduction, magnetic powder of micron size is mixed with a solvent and a dispersant in a ball mill in order to grind for

a period of several weeks

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1.C. Scherer* and A. M. Figueiredo Neto(Received on 28 July, 2005).chemical sociey reviews

2.https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F278871401896654100%2F&psig=AOvVaw1SPPday3QS8ln_kOZ63-3o&ust=1670398010128000&source=images&cd=vfe&ved=2ahUKEwj5rr7Ru-T7AhUQGRoKHUqCCQUQr4kDegUIARDLAQ

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https://www.slideserve.com/tan/ferrofluids

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Unique Properties

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1. stick to magnets

2. take on 3-dimensional shape of a magnetic field

3. change density in proportion to magnetic feild strength

4.Dynamic response of ferrofluid droplets to an external magnetic field. a) Scheme of ferrofluid droplet division under a magnetic field. The field intensity increases from 1 to 4.

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https://en.wikipedia.org/wiki/Ferrofluid

6. b) Optical images of ferrofluid droplet divisiona

Behavior of ferrofluid droplet array under an enhancing magnetic field (a) and a rotating magnetic field

(b). c) Scheme of an example of ferrofluid-based fabrication process. d,e) Optical and scanning electron

microscopy (SEM) images of the polymer template derived from ferrofluid arrays. f–h) The nepenthes

peristome-inspired anisotropic surfaces based on ferrofluid-assembled templates. The scale bars are 50

μm. a–h) Reproduced with permission.[51] Copyright 2017, Wiley-VCH

Film

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Applications

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Damping: Speakers

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https://www.slideserve.com/tan/ferrofluids

Application in disease treatments

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Application in health fields

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Magnetic separation of waste

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Summary

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References

1. https://www.slideserve.com/tan/ferrofluids

2.https://www.google.com/search?

3.C. Scherer* and A. M. Figueiredo Neto(Received on 28 July, 2005).chemical sociey reviews

4.https://noqreco.com/%D9%BE%D8%AE%D8%B4-%DA

5.S. S. Papell, U.S. Patent no 3, 215, 572 (1965)

M. Magalhães, A. M. Figueiredo Neto, A. Bee, and A. Bourdon, J. Chem. Phys. 113, 10246 (20006.

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