Self-assembled tunable networks of sticky colloidal particles

Abstract

Surfaces decorated with dense arrays of microscopic fibres exhibit unique materials properties, including superhydrophobicity and low friction. Nature relies on 'hairy' surfaces to protect blood capillaries from wear and infection (endothelial glycocalyx). Here we report on the discovery of self-assembled tunable networks of microscopic polymer fibres ranging from wavy colloidal 'fur' to highly interconnected networks. The networks emerge via dynamic selfassembly in an alternating electric field from a non-aqueous suspension of 'sticky' polymeric colloidal particles with a controlled degree of polymerization. The resulting architectures are tuned by the frequency and amplitude of the electric field and surface properties of the particles. We demonstrate, using atomic layer deposition, that the networks can serve as a template for a transparent conductor. These self-assembled tunable materials are promising candidates for large surface area electrodes in batteries and organic photovoltaic cells, as well as for microfluidic sensors and filters.

Velocity statistics of dynamic spinners in out-of-equilibrium magnetic suspensions

“…[1][2][3][4][5][6][7][8][9][10][11][12] A series of experiments on granular gases driven mechanically [13][14][15][16][17][18][19][20] or electrostatically 21,22 and numerical simulations 20,[23][24][25][26][27] demonstrated that even dilute systems of macroscopic particles behave differently than molecular gases at equilibrium. Out-of-equilibrium self-assembly holds a promise for a design strategy of complex materials not generally available near thermodynamic equilibrium.…”

Training Concept, Evolution Time, and the Maximum Entropy Production Principle

“…A spontaneous self-assembly has been studied in systems of particles dispersed in colloids [31][32][33]. Particles suspended at air-fluid interfaces [34,35] as well as at a fluid-fluid interfaces [36] can also present an orderly behavior.…”

Statistical analysis of phase formation in 2D colloidal systems

“…Of particular interest are studies of frustration [6], network formation [7][8][9][10][11][12], crystallization [13][14][15][16][17] or the glass transition [18][19][20]. The beauty of microscopy in this context is that the structures are imaged in real space and can be directly visualized.…”