Tenax-Based Electrospun Fibrous Membranes for Efficient VOC Sampling.

The influence of solvent mixtures on electrospinning polymer solutions plays a crucial role in both the electrospinning process and the characteristics of the resulting fibers. Solvents with varying properties can be used to optimize thermodynamic stability, viscosity, evaporation rate, and dielectric constant of a solution simultaneously. This study investigates the fabrication of highly porous poly-2,6-diphenyl-p-phenylene oxide (PPPO) fibers via electrospinning from binary and ternary solvent mixtures.

Electrowetting hysteresis on a deformable dielectric film.

Electrowetting on dielectric (EWOD) involves actuating droplets through electrical stimulus while the droplets lie on a dielectric layer that covers the electrode. In order to activate the droplet, a higher threshold voltage is required due to electrowetting hysteresis. The effect of a deformable dielectric layer and its thickness on electrowetting hysteresis has not been studied.

Twist elastic constant of chiral nematic cellulose nanocrystals determined by tactoid reconfiguration in electric field.

Lyotropic chiral nematic cellulose nanocrystals (CNCs) have attracted significant attention and great progress has been made. Investigating their physical parameters, especially the twist elastic constant (K), is pivotal for advancing our comprehension of fundamental viscoelastic property of chiral nematic phase. In this study, we demonstrate a straightforward method to simultaneously estimate K and helical twisting power (K) of chiral nematic CNCs.

Charge transport in electrospinning of polyelectrolyte solutions.

This study elucidates the electrical charge transport during electrospinning of weak polyelectrolyte (poly(acrylic acid) (PAA)) solutions by employing current emission measurements. With pH variation, the PAA ionization degree could be controlled from uncharged at low pH to weakly charged at intermediate solution pH. Electrospinning neutral poly(vinylpyrrolidone) (PVP) as a reference polymer solution confirmed established current-flow rate scaling relationships as shown by De La Mora and Loscertales (1994), ∼ (), independent of the applied electric field polarity, where = 0.

A paper-based point-of-care device for the detection of cysteine using gold nanoparticles from whole blood.

We present a colorimetric probe based on polyvinylpyrrolidone-capped gold nanoparticles (PVP-AuNPs) that is sensitive and selective for cysteine (Cys). A microfluidic paper-based analytical device (μ-PAD) with embedded dried PVP-AuNPs at the polyethersulfone (PES) paper surface is used for Cys detection. When thiol molecules attach to PVP-AuNPs in the presence of Cys, they clump together, and this causes the solution's color to shift from red to blue within 5 minutes.