Examples of Monodisperse Materials

All the previous experimental data provide a useful guideline for producing well-controlled materials. Monodisperse fragmentation is obtained if two experimental conditions are fulfilled  

The applied shear and stress are high enough to rapidly induce the Rayleigh instability. 

The monodisperse materials described hereafter were obtained with the Couette type cell designed by Bibette et al. [ 150,159]. It consists of two concentric cylinders (rotor and stator) separated by a very narrow gap (100 pm), allowing application of spatially homogeneous shear rates over a very wide range (from 0 to 14280 s ), with shearing durations of the order of 10 s. 

Surfactants are commonly used to kinetically stabilize colloidal systems. An alternative way to achieve long-term metastability consists of adsorbing 

Rgure 1.27. Emulsion obtained by shearing a premixed emulsion in presence of a nonadsorbing polymer. System composition sodium alginate (nonadsorbing polymer) 4 wt%, nonionic surfactant (NP7) 3 wt%, oil fraction = 30 wt%. (a) Size distribution, (b) microscopic image. (Adapted from [137].) 

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