Granular Interfaces in TENGs: The Role of Close‐Packed Polymer Bead Monolayers for Energy Harvesters

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Over the last decade, triboelectric nanogenerators (TENGs) are proposed as a viable alternative to address impetus for affordable and clean energy. Here, novel, cost-effective granular-based TENG comprising two electrodes covered with HCP monolayers of monodisperse polymer (PMMA, PS, MF-resin) beads diameters ranging between 0.5 10 µm is proposed. These attained in <20 s by employing solvent-free particle rubbing assembly technique on fluorocarbon-coated substrates. The performance characterized using contact-separation (CS) experiments changing bead sizes (topography effects) material (mechanical properties). findings show that when identical utilized, large charged negatively, small positively, coinciding bulk film reports. In addition, MF particles always charge positively highest charging due their relatively higher Young's modulus. results elucidate specific pair's surface density enhanced one smaller modulus, highlighting mechanical properties dominate substantial difference size benefits output. stable devices after 000 cycles corroborates its robustness.

Language: Английский

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Sealing and Chromatographic Performance of Microgroove Columns

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

In a recent paper, we introduced the concept of structured microgroove columns as potential solution to obtain perfectly ordered particle beds for nano- and micro-LC. this concept, spherical particles are either individually positioned (single layer column) or stacked (multilayer in series interconnected micromachined pockets. After introducing suitable method fill efficiently one-particle-per-pocket mode, present contribution addresses issue sealing filled reports on first flow tests conducted column device. For purpose, an adapted set was with 10 μm calibrated silica subsequently anodically bonded borofloat top plate. The chromatographic performance prototype is determined by injecting band fluorescent dye into unretentive column. Reduced plate heights were higher (hmin = 2 instead 1) than theoretically expected, while pressure drop resistance much closer expected value (ϕi,i 120 versus 130 expected). It assumed height deviations from theory due fact that pockets somewhat oversized (some 75%), creating unnecessary large dead spaces.

Language: Английский

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Solvent-Free Confinement of Ordered Microparticle Monolayers: Effect of Host Substrate and Pattern Symmetry

Soft Matter, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

We report a solvent-free assembly method where microspheres align on fluorocarbon patterns without rigid boundaries, creating tunable crystal patterns. Our findings highlight the impact of tribocharging and substrate elasticity particle ordering.

Language: Английский

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Tribocharged granular assembly of polystyrene beads confined between plates using acoustic vibrations

Soft Matter, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

In this work, we investigate the transition from an amorphous state to crystal ordering of 3 mm-sized polystyrene beads in a two-dimensional system between two plates, one them fixed and other is mobile can move across beads. The vibrated vertically, have investigated effect frequency, number particles, different materials covering bottom top plate. We found that crystallisation promoted by motion upper plate, which pushes particles centre plate's configuration onset tribocharged-induced electrostatic interactions. plate creates effective pressure over particles. Thus, drives ordered particle configuration, electric charges stabilise it. By changing surface experimenting with steel balls, strong charging demote formation, no inhibits formation.

Language: Английский

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