"Two-faced god" film: one superhydrophobic side super hydrophilic

In nature, the surface of lotus leaf, rice leaf and other materials exhibit different superhydrophobic properties. Taoism is natural, people based on the bionic strategy to achieve the construction of a series of materials super-hydrophobic surface. However, in addition to the superhydrophobic property, the "leaf effect", the surface of the lotus leaf exhibits a "Janus" wetting property with a superhydrophobic surface and a hydrophilic bottom surface.

The two-sided god wetting characteristics of the lotus leaf

This characteristic of the simulated lotus leaf surface was performed on the surface of the Janus membrane with significant wettability differences. Recently, a joint research team of Turkey-Germany has used filter paper as a porous substrate to easily construct a superhydrophobic/hydrophilic significant wettability difference by single-sided modification of polydimethylsiloxane (PDMS)/inorganic micro-nanoparticles. Two-faced god" membrane. The Janus membrane has excellent chemical stability, mechanical stability and flexibility, while maintaining good gas permeability, and has great application prospects in wound treatment and the like.

Microstructure of the hydrophobic surface of the lotus leaf

The researchers selected Whatman No. 1 filter paper and laboratory engineering cotton filter paper as the base material. The PDMS, silicon nanoparticles and glass microspheres were uniformly mixed and applied to the surface of the substrate by spray coating. After 120 °C heating and cross-linking treatment, PDMS The valence is grafted onto the surface of the filter paper. The surface of the side filter paper exhibits superhydrophobic properties (contact angle 163.1 ° ± 1.2 °).

At the same time, studies have shown that the mixing of three different sizes of inorganic particles (9?13μm, 20?60μm, several nanometers) is necessary for the construction of superhydrophobic surfaces. The micron-sized and nano-scale inorganic particles synergistically provide micro-nano rough surfaces. .

Preparation and surface morphology of Janus membrane

It was found that the heat treatment made the PDMS and the substrate covalently bond, and further characterized the internal structure of the "two-faced god" film. The results showed that the coating component penetrated and diffused into the porous filter paper to form a gradient chemical modification during the coating preparation process. Structure; this structural property effectively guarantees the solvent/water stability of the "two-faced" membrane. The "two-faced god" film maintains a hydrophilic character based on the bottom, which maintains a high water absorption (80 g/m2) as a whole.

Based on the excellent flexibility of the filter paper, the surface silicone rubber coating component and the covalent bond interface between the substrate and the coating, combined with the hybrid modification of the inorganic micro-nano particles, the surface of the "two-faced god" film has excellent superhydrophobicity. Wet stability. The coating retains its excellent superhydrophobic properties after cyclic bending and friction testing.

Surface coating mechanical stability test

The preparation method of the "two-faced god" membrane is simple, easy to prepare in a large area, and is suitable for commercial production, and provides an important research idea for the development of functional coatings, waterproof and breathable fabrics in the textile field.

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