I would like to receive comments on the alignment of ferrofluid droplet with an effect of magnetic field [ kindly check the attachment ] . For same quantity and same magnetic field , distance the ferrofluid droplet of different particle size exhibits different pattern , smaller particle size tends to accumulate more closer [ Fig.a ] , with increase in particle size , it tends to spread out [ Fig. b ] , with an effect of surfactant for smaller particles , it tends to spread in larger area [ Fig.c ] and if the magnetic field is moved then accumulation is towards one point leaving behind some particles away from magnetic field [ Fig.d ] , can somebody explain the relation between the effect of magnetic field on various pattern for particles with different size . need clarification on accumulation , spread out  w.r.t particle size and magnetic field. 

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