A Breathable Knitted Fabric-Based Smart System with Enhanced Superhydrophobicity for Drowning Alarming

Abstract

Wearable strain sensors have aroused increasing interest in human motion monitoring, even for the detection of small physiological signals such as joint movement and pulse. Stable monitoring of underwater human motion for a long time is still a notable challenge, as electronic devices can lose their effectiveness in a wet environment. In this study, a superhydrophobic and conductive knitted polyester fabric-based strain sensor was fabricated via dip coating of graphene oxide and polydimethylsiloxane micro/nanoparticles. The water contact angle of the obtained sample was 156°, which was retained above 150° under deformation (stretched to twice the original length or bent to 80°). Additionally, the sample exhibited satisfactory mechanical stability in terms of superhydrophobicity and conductivity after 300 abrasion cycles and 20 accelerated washing cycles. In terms of sensing performance, the strain sensor showed a rapid and obvious response to different deformations such as water vibration, underwater finger bending, and droplet shock. With the good combination of superhydrophobicity and conductivity, as well as the wearability and stretchability of the knitted polyester fabric, this wireless strain sensor connected with Bluetooth can allow for the remote monitoring of water sports, e.g., swimming, and can raise an alert under drowning conditions.

Wettability, Self-Cleaning Property, and Mechanical Durability of A390 Aluminum Alloy with the Major Effect of Si Phases

“…The addition of Si elements significantly improves the wear resistance of aluminum alloys . For hydrophobic surfaces, mechanical durability refers to the ability of the surface to resist loss of hydrophobicity due to external mechanical forces, of which wear resistance is one of the most important aspects. , Therefore, the wear resistance of 5-MAAS was tested by abrasion tests and the results are shown in Figure .…”

“…46 For hydrophobic surfaces, mechanical durability refers to the ability of the surface to resist loss of hydrophobicity due to external mechanical forces, of which wear resistance is one of the most important aspects. 47,48 Therefore, the wear resistance of 5-MAAS was tested by abrasion tests and the results are shown in Figure 8. Figure 8g−i shows the surface CAs, advancing and receding angles, SAs, and CAH of 5-MAAS after being abraded for different lengths, from which it is evident that the change of CA exhibits three stages.…”

Polydimethylsiloxane Composite Sponge Decorated with Graphene/Carbon Nanotube via Polydopamine for Multifunctional Applications

“…Similar results were also provided by other authors. 53,54 3.6. Photothermal Conversion Performance of the rGO-CNT/PDA@PDMS Composite Sponge.…”

Antibacterial Superhydrophobic Cotton Fabric with Photothermal, Self-Cleaning, and Ultraviolet Protection Functionalities

“…Ratios between NM particles and PDMS played an important role in determining the WCA, washing fastness and abrasion resistance of coatings. Zhu et al developed a superhydrophobic conductive polyester knitted fabric through applying reduced graphene oxide (rGO) nanosheets and PDMS micro/nanoparticles. They initially immersed the fabric into a graphene oxide (GO) solution and then treated it with hydroiodic acid to reduce GO into rGO.…”