Hartmut-Loewen.pdf
Hartmut-Loewen.pdf
Hartmut-Loewen.pdf
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Colloids - controlled by an external magnetic field<br />
• spherical colloids confined<br />
to water/air interface<br />
• superparamagnetic ti due d to t<br />
Fe2O3 doping<br />
• external magnetic field B v<br />
• external magnetic field B<br />
� induced dipole<br />
moments<br />
v v<br />
� tunable interparticle m χB<br />
potential<br />
tilt angle φφ<br />
surface normal B v<br />
n v<br />
φ =<br />
0<br />
φ =<br />
0<br />
54.<br />
7<br />
φ =<br />
0<br />
90<br />
= repulsive no interaction attractive<br />
potential ( for θθ<br />
= 0 )<br />
r<br />
u( r ) = uHS<br />
m<br />
+<br />
2<br />
2<br />
1<br />
r<br />
3<br />
( 1<br />
2 2<br />
− 3cos<br />
φ cos θ )<br />
θ = ( r, B )<br />
v v
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