A mechanochemically created durable dynamic superhydrophilic‐like surface

Abstract

Superhydrophilicity (superwettability) is generally defined as either a static water contact angle near 0° or water completely wetting the surface. Here, we show that there is a superhydrophilic‐like surface that has a large static water contact angle but demonstrates superhydrophilicity in its dynamic water contact performance. We found that polyethylene terephthalate (PET) surfaces showed such behavior following mechanical abrasion with sandpaper. We have evaluated the wettability of the abraded PET surfaces by using static water contact angle (SWCA) measurements and the dynamic water contact performance (DWCP) of impacting droplets, the latter including water sprays, water immersion, anti‐fogging and water droplet impact tests. The water was found to completely wet the abraded PET surfaces on spraying or immersion, although the measured SWCA was as high as 70°, similar to that of the unabraded PET surface. For the abraded PET surface, both the water layer thickness on water immersion and the subsequent drying time were similar to those of an especially coated superhydrophilic layer on the unabraded surface. Accordingly, superhydrophilicity may be determined by the process used to measure it.

Preparation of robust superhydrophobic surface on PET substrate using Box-Behnken design and facile sanding method with PTFE powder

“…As shown in figures 10(a) and (b), the major elements on the surface of untreated and only abraded PET samples are C and O. The main difference is only in the relative concentration of the elements (table S2 in the supplementary materials), and the peak ratios are different [48]. Figure 10 [44][45][46][47].…”

Synergistic Interface Platforms: Designing Superhydrophilic Conductive Nanoparticle‐Decorated Nanofibrous Membranes

“…[29] This reduction in surface tension leads to a WCA of 5-10°or allows for the complete absorption of water across the substrate's surface. [30] The -NH functional groups on the membrane surface, facilitated by the presence of the PPy particles, contribute to the formation of hydrogen bonds with water molecules, effectively entrapping them. Furthermore, previous research on the topic has demonstrated that increasing the pore size of a material, including electrospun membranes, can enhance its hydrophilicity and vice versa.…”