Skype-Interview

‘The Magnetic Braillepin’

Arne Lüker, 22nd of Feb. 2013, iit Genua/Italy

arnelueker@aim.com

www.arne-lueker.de

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GIVEN TOPIC

Micro Magnetic Braillepin (MMB)

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Fundamentals:

Lorentz Law Biot-Savart Law

The coil is the moving part in this arrangement(like the voice-coil in a loudspeaker)

The tube reduces the friction between the moving coil and its core.

( Polyimide tube: The inner surface is smooth enough to provide minimum friction, while the polyimide

is stiff enough to provide a rigid base for the winding procedure – mandrel(*)

The cap on top focuses the force in a smaller contact area to the fingertip and gives a well defined contact

point.

*) A. Lüker, O. Sternberg, H. Hein, J. Schulz and K-D. Möller; "Thick capacitive meshes on polyimide substrates", Infrared Physics & Technology 45 (2004) 153–157

Based on "Development of Wearable Micro-Actuator Array for 3-D Virtual Tactile Displays", Z. Szabo, E. T. Enikov, Journal of Electromagnetic Analysis and

Applications, 2012, 4, 219-229

The synthesis of Cu–Ni–Fe ferromagneticnanocomposites for “Core” and “Base” by modified Sol–Gel(*

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Aqueous solution ofNi(NO3)2∙6H2O

Aqueous solution ofCu(NO3)2∙3H2O

Stirring and pH-control (7.5-8.5) with 25% aqueous solution of ammonia

Stirring and heating at 70-80°Ctransparent green „Gel“

Mixing with 70% aqueoussolution of glycolic acid

Evaporation of Volatiles 70-80°C for 5 h

„Sol“

Aqueous solution ofFe(NO3)2∙9H2O

Calcination at 600°Cnanocomposite „Powder“

Cold pressing into form,Sintering at 800-900°C for 30 min., Final Bake at 1200°C for 4 h in air.

*) A. Lüker, Sol–gel route of ferromagnetic Cu-Ni-Fe nanocomposites, Research Notes 4159, 2009

Magnetic Nanocomposites, NMPs, are tunable as a

function of particle size, size distribution and interparticle

interactions

They are “lighter” than metals

Their (ferromagnetic) characteristics can be easily

altered by varying the stoichiometric composition or

by doping

Problems

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(a) The “coil”: difficult to produce via LIGA and MEMS

winding a wire

(b) Because of the friction between coil and core

electric power is needed to get to the “down-state”

(Examples of MEMS-coils)

Comparison

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MEEP MMB

Reaction time fairly quick fast

Construction sophisticated simple

Scientific impact fair moderate

Power consumption only „upwards“ both ways

Main problem modification of the electroactive polymer

the coil via MEMS

“Eye Catcher” the polymer the nanocomposites

Force [mN] 50 30*)

Displacement [µm] 1000 1500*)

Interesting Challenge and Motivation for the next two years which impacts different areas of applied sciences!

*) Taken from Z. Szabo, E. T. Enikov, Journal of Electromagnetic Analysis and Applications, 2012, 4, 219-229

Thanks!

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