One Droplet toward Efficient Alcohol Detection Using Femtosecond Laser Textured Micro/Nanostructured Surface with Superwettability

Abstract

Alcohol with different concentrations is commonly used in food, industry, and medicine fields all over the world. However, current methods for detecting alcohol concentration are restricted to large sample consumption, additional senergy consuming, or complex operations. Here, inspired by superwettability of lotus leaves, a superhydrophobic and superorganophilic surface is designed on the polydimethylsiloxane (PDMS) for one droplet efficient alcohol detection, which is prepared via femtosecond laser direct writing technology. Meanwhile, the contact angles of droplets with various alcohol concentrations on the laser‐treated PDMS (LTP) surface are different. Based on the above characteristic, alcohol concentration through contact angle measurement without any external energy is directly detected, which is simple and efficient. Furthermore, it is worth noting that the LTP surface remains stable wettability after 1000 water–ethanol cycles and 300 days tests in air, indicating strong surface repeatability and stability. Significantly, the LTP surface has a broad potential application in one droplet detecting alcohol concentration, fake or genuine wine, and alcohol molecules. This work provides a new strategy to fabricate a superwetting surface for efficient one droplet alcohol detection.

Advanced Fog Harvesting Method by Coupling Plasma and Micro/Nano Materials

“…The examples of the hydrophilicity and hydrophobicity of materials that affect the movement of the attached droplet are widely available in nature and the industrial community, such as the lotus leaf, , beetle, and Janus mesh. − Based on this principle, a composite structure consisting of HB and HL segments of a collecting electrode is proposed, as shown in Figure . The contact angle θ between HB and HL for a droplet is approximately 120 ± 3° and 3 ± 0.5°, respectively.…”

Controllable Fabrication of Hydrophilic Surface Micro/Nanostructures of CFRP by Femtosecond Laser

“…To investigate the physical function of the laser-processed CFRP, we also investigated surface wettability. Unique wetting phenomena, such as excellent hydrophobicity and hydrophilicity, can be exhibited by superwettable textured surfaces and have enabled a wide variety of applications in the fields of bionics, biosensing, surface performance improvement, and so on. − Ultrafast laser processing has great potential in regulating the surface wettability of various materials and achieved significant applications. − ,− The surface wettability of CFRP processed by a femtosecond laser with different laser pulse energies and scanning speeds is shown in Figure . The nontreated CFRP was hydrophobic, and its initial contact angle of water droplet was 105.6°, which was attributed to the good hydrophobicity of smooth epoxy resin on the surface of nontreated CFRP. − Figure a shows the dependence of the droplet contact angle of the laser-processed CFRP on laser scanning speed.…”

Femtosecond laser-scribed superhydrophilic/superhydrophobic self-splitting patterns for one droplet multi-detection

“…However, the liquid film was finally fixed to the SHB stripe. Since alcohol has hydrophilic properties and can potentially wet both SHB and SHL surfaces, the anisotropic wetting effect was not obvious 60–64 (Fig. S13 in the ESI†).…”