Nano and Microfluidics Laboratory (NMfL)

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Suspensions and Colloids
Ishan Wathuthanthri
[email protected]
Department of Mechanical Engineering
Stevens Institute of Technology
New Jersey, USA
Nano and Microfluidics
Laboratory (NMfL)
Suspensions
• Particles larger than ~1000nm.
• Separated by gravity.
• Examples (sand/water, dust/air)
Nano and Microfluidics
Laboratory (NMfL)
Making An Interesting Suspension
Mix two parts cornstarch to one part water.
• 100ml cornstarch (large beaker)
• 50ml water (small beaker)
• Place cornstarch into a ziploc bag and add
water.
• Close bag and mix.
Write down some characteristics of this
suspension.
Nano and Microfluidics
Laboratory (NMfL)
Nano and Microfluidics
Laboratory (NMfL)
Colloids
• Particles upto ~100nm.
• Cannot be separated by gravity
Nano and Microfluidics
Laboratory (NMfL)
Example of a Colloid- Ferrofluids
• Ferrofluids- “ferro” iron.
• Polarized in a magnetic field.
• Colloidal mixture of iron particles
suspended in a carrier fluid.
• Generally particles ~10nm.
Reference- L.Mao and H. Koser.
Nano and Microfluidics
Laboratory (NMfL)
History
• Developed by NASA in the 1960’s.
• Method of controlling fluids in space.
Nano and Microfluidics
Laboratory (NMfL)
Review of Magnetism
Nano and Microfluidics
Laboratory (NMfL)
Nano and Microfluidics
Laboratory (NMfL)
Electromagnet
Nano and Microfluidics
Laboratory (NMfL)
Nano and Microfluidics
Laboratory (NMfL)
Applications of Ferrofluids
• Liquid seals in bearings. Used in hard
drives/ o-rings.
Nano and Microfluidics
Laboratory (NMfL)
Speakers
• Used for and cooling around coils.
Nano and Microfluidics
Laboratory (NMfL)
Dampening
• Internal dampers in shock absorbers
and stepper motors etc.
Nano and Microfluidics
Laboratory (NMfL)
Biomedical Application
• Magnetic cell separation chambers
Nano and Microfluidics
Laboratory (NMfL)
• Target delivery agents.
Nano and Microfluidics
Laboratory (NMfL)
Telescopes for Astronomy
• Research conducted in using
ferrofluids for liquid mirrors.
http://www.newscientist.com/article/dn15154-morphingmirror-could-clear-the-skies-forastronomers.html?feedId=online-news_rss20
Nano and Microfluidics
Laboratory (NMfL)
Thank you.
Questions?
Nano and Microfluidics
Laboratory (NMfL)
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