Abstract
A directed attractive interaction between predefined "patchy" sites on the surfaces of anisotropic microcolloids can provide them with the ability to self-assemble in a controlled manner to build target structures of increased complexity. An important step toward the controlled formation of a desired superstructure is to identify reversible electrostatic interactions between patches which allow them to align with one another. The formation of bipatchy particles with two oppositely charged patches fabricated using sandwich microcontact printing is reported. These particles spontaneously self-aggregate in solution, where a diversity of short and long chains of bipatchy particles with different shapes, such as branched, bent, and linear, are formed. Calculations show that chain formation is driven by a combination of attractive electrostatic interactions between oppositely charged patches and the charge-induced polarization of interacting particles.
Highlights
In addition to these computational simulations, patchy particles with two (Janus particles) or more patches have been preparedPatchy particles, as particular types of anisotropic microcolloids, in recent experimental work.[10,11] self-assembly of these are increasingly attracting attention due to their nonuniform, often particles into chains or helices has not been reported.[10,12] Patchy asymmetric shape, and characteristic properties
Self-aggregation behavior in solutions of bipatchy particles was followed by fluorescence microscopy
Since the yield of bipatchy particles by sandwich μCP is lower than 100%, self-aggregation occurs in a mixture of monoand bipatchy particles
Summary
In addition to these computational simulations, patchy particles with two (Janus particles) or more patches have been prepared. Been formed via microcontact printing with wrinkled poly dimethylsiloxane (PDMS) stamps Despite their shape diversity, all of these patches were uniform in other properties and identically charged.[19,20,21] Chemical or physical interactions between. From a comprehensive statistical analysis of variable chains, such as short and long, branched, bent and linear, we can show that chain formation through the connections between patches is due to electrostatic attractions between oppositely charged patchy particles. These interactions can be weakened or even eliminated by increasing the ionic strength of the medium
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