Iqbal, Muhammad Hamza; Miguel A, Quetzeri-Santiago; Castrejon-Pita, Alfonso Arturo; Castrejon Pita, Rafa; (2025) Droplet Impact onto Textiles: Wetting, Spreading, and Lamella-Controlled Splashing. Journal of Colloid and Interface Science (In press).

Text Textiles__JCIS__2nd_Resubmission (1).pdf - Accepted Version Access restricted to UCL open access staff until 12 April 2026. Download (11MB)

Abstract

Hypothesis: Textile weave structure, surface roughness, wettability, and liquid viscosity play a role in droplet spreading and the splashing behavior on commercial textiles following impact. We hypothesize that, collectively, these parameters define whether the droplet undergoes smooth spreading or splashing. // Experiments: In our experiments, we visualize the impact dynamics of droplets on textile samples. Experiments were conducted on eight commercial textiles featuring satin and plain weaves. Here, we used three Newtonian fluids (water, silicone oil, and a 45 wt.% aqueous glycerol solution) to investigate the post-impact behavior. High-speed shadowgraphy captured the impact at 30,000–50,000 frames per second. Fresh textile samples were used for each experiment to prevent contamination. In line with past works, textile samples were affixed to glass substrates to facilitate the visualization of surface-level spreading and splashing dynamics. Surface topography was quantified using high-resolution optical profilometry, revealing nearly an order of magnitude variation in root-mean-square roughness (Rₘₛ), ranging from 4 to 35 μm. Impact velocities ranged from 1.00 to 2.98 m/s, with 3 repeats per condition. Image analysis was used to quantify spreading speeds and diameters. The droplet behavior was classified into spreading or splashing, depending on whether the droplet fragments following impact. // Findings: Satin weaves promoted Cassie-Baxter wetting with high advancing and static contact angles (θₐₘₐₓ ≈ 130 and θₛₜₐₜᵢ

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