2 research outputs found
<i>In Situ</i> Active Poling of Nanofiber Networks for Gigantically Enhanced Particulate Filtration
Enhancing
the filtration efficiency of air filtering material without
increasing its airflow resistance is a major challenge and of great
significance. In this work, we report a type of active-poled nanofiber
onto which <i>in situ</i> active poling is applied. It results
in significantly enhanced filtration efficiency as well as dust holding
capacity while keeping the airflow resistance constant. Owing to the <i>in situ</i> applied electric field, the nanofibers as well as
the particulates are polarized. As a result, at a poling voltage of
2 kV, the removal efficiency and the quality factor for PM<sub>2.5</sub> are enhanced by 17% and 130%, respectively. More importantly, the
dust holding capacity represents a 3.5-fold enhancement over normal
nanofibers. The approach reported in this work has the potential of
being practically utilized in air purification purposes because it
can bring about not only promoted filtration performance but also
lowered noise and reduced power consumption
Triboelectrification-Induced Self-Assembly of Macro-Sized Polymer Beads on a Nanostructured Surface for Self-Powered Patterning
Here we report an electrostatic-templated
self-assembly (ETSA) method for arbitrarily patterning millimeter-sized
polymer beads on a nanostructured surface without using an extra voltage
source. A patterned electrode underneath an electrification layer
generates “potential wells” of the corresponding pattern
at predefined window sites, which capture and anchor the beads within
the window sites by electrostatic force. Analytical calculation is
combined with numerical modeling to derive the electrostatic force
acting on the beads, which is in great agreement with experimentally
measured values. The generated pattern is solely determined by the
predefined
underlying electrode, making it arbitrarily switchable by using different
electrode patterns. By transferring the assembled beads into an elastomer
matrix, possible applications of the ETSA in fabricating optical and
flexible displays are demonstrated