Pillar[5]arene microcapsules turn on fluid flow in the presence of paraquat

Abstract

We report the fabrication of pillar[5]arene (P[5]A) stabilized MCs via the self-assembly and crosslinking of P[5]A nanoaggregates at the liquid–liquid interface. These P[5]A MCs microengines turn on fluid flow in the presence of paraquat (PQ) due to host–guest molecular recognition.

Polymer multilayer films regulate macroscopic fluid flow and power microfluidic devicesviasupramolecular interactions

“…Based on these data, our first assumption was that thermal buoyancy may cause a density-driven flow around the polymer multilayer film, as reported earlier. 30 However, the previous reports of self-powered micropumps suggested that a combination of thermal and solutal buoyancy played a role in the density-driven flow. 31 To confirm the density-driven flow, the micropump chamber was inverted so that the direction of gravity was reversed relative to the pump orientation.…”

Flow‐based Detection of Micropollutants Using a Pillar[5]arene Multilayer Film

“…Additionally, Pillar[n]arenes are very well‐known analyte‐micropollutant trapping molecules that have been incorporated into polymer networks, [14] hydrogel, [15] multilayer films [16] . Recently our group devised a pillar[5]arene microcapsule‐based micro engine that could turn on flow in presence of paraquat [17] . Based on this flow behavior and inherent “guest” recognition ability of pillar[5]arene, we envisaged detecting micropollutant molecules.…”

“…[16] Recently our group devised a pillar [5]arene microcapsule-based micro engine that could turn on flow in presence of paraquat. [17] Based on this flow behavior and inherent "guest" recognition ability of pillar [5]arene, we envisaged detecting micropollutant molecules.…”

Maneuvering Fluid Motion and Flow-Induced Detection of Toxins by Enzyme Multilayer Films

“…Thus, the concept of disposable microfluidic system devices started to arise where a simple actuation mechanism with cost-effective manufacturing is highly desired and the device should provide a read-out without using any spectroscopic and electrochemical equipment. The last decade witnessed the discovery of self-powered micropumps where motion was generated at the cost of chemical energy and the device setup was capable of handling small volumes of liquid at a programmable rate. − These self-powered micropumps provide an ideal platform for analyte detection by maneuvering the fluid flow, and the readout of these devices is based on a simple optical tracking method . Mimicking the biological machineries, an enzyme-powered micropump was developed in which macroscopic fluid flow was generated by harnessing enzyme catalysis in the presence of a specific substrate .…”

“…5−7 These self-powered micropumps provide an ideal platform for analyte detection by maneuvering the fluid flow, and the readout of these devices is based on a simple optical tracking method. 8 Mimicking the biological machineries, an enzyme-powered micropump was developed in which macroscopic fluid flow was generated by harnessing enzyme catalysis in the presence of a specific substrate. 9 The flow rate in these devices was modulated by changing the substrate concentration, which in turn was dependent on the reaction rate of the enzyme.…”