Hierarchically Structured Assembly of Polymer Microsieves, made by a Combination of Phase Separation Micromolding and Float‐Casting

Abstract

Phase separation micromolding and float-casting are combined to prepare hierarchically structured microsieves.

25th Anniversary Article: Scalable Multiscale Patterned Structures Inspired by Nature: the Role of Hierarchy

“…The pedicel layer, which is another filtration barrier layer, acts as a supporting structure providing mechanical strength to support the filtration barriers. Inspired by such a remarkable ability of selective filtration of the glomerular capillaries, nanoporous membranes or nanostencils for selective mass transport have recently been explored for the separation, detection, and purification of biomolecules . For the functionality of these artificial nanoporous stencils, an additional microsized structure plays a role in mechanically supporting a free‐standing, porous nanomembrane, offering a highly selective transport property.…”

“…Furthermore, membranes with different properties can be easily produced by simply changing the polymeric materials used. The representative fabrication method of hierarchical polymeric membranes is a combination of phase separation micromolding and float‐casting . Based on this combined fabrication method, microsized supportive structures can be produced by phase separation micromolding and nanosized filtration membranes by the float‐casting method in a highly controllable and precise manner .…”

Linearly and Highly Pressure‐Sensitive Electronic Skin Based on a Bioinspired Hierarchical Structural Array

“…Hierarchical structures on the surfaces of organs, for example, can be critical for the survival of the organism: the maximized contact area and intermolecular interactions (van der Waals forces) resulting from the hierarchical structures on the feet of the gecko enable this animal to climb a vertical wall, [21] and the self-cleaning ability of the lotus leaf is attributed to the ability of the hydrophobic hierarchical structure on its surface to trap pockets of air. Dry adhesion, [22] wetting control, [23][24][25] and filtration membranes [26] have in fact been developed by mimicking hierarchical structures from nature. In the field of pressure-sensitive electronic skin, Ha et al [27] used a hierarchical structure composed of Pt-coated ZnO nanorods on a polydimethylsiloxane (PDMS) microdome array; the authors demonstrated a high-sensitivity (6.8 kPa −1 ) dual-mode pressure sensor based on piezo-resistive and piezo-electric transductions.…”

Nanomesh‐Structured Ultrathin Membranes Harnessing the Unidirectional Alignment of Viruses on a Graphene‐Oxide Film

“…As shown in Figure c, unidirectionally aligned viruses are orthogonally crossed to form the nanomesh structure. To provide the mechanical stability and stand‐alone properties to withstand the applied pressure, we used an underlying supporting membrane . Here, we used a supporting macroporous film of anodic aluminum oxide (AAO) with an average pore diameter of 200 nm.…”