Hierarchical Superhydrophobic Device to Concentrate and Precisely Localize Water-Soluble Analytes: A Route to Environmental Analysis - Archive ouverte HAL Access content directly
Journal Articles Langmuir Year : 2022

Hierarchical Superhydrophobic Device to Concentrate and Precisely Localize Water-Soluble Analytes: A Route to Environmental Analysis

(1, 2) , (3) , (3) , (3) , (2) , (4) , (1)
1
2
3
4

Abstract

An efficient superhydrophobic concentrator is developed using a hierarchical superhydrophobic surface on which the evaporation of a sessile droplet (6 mu L) drives the nonvolatile elements it contains on a predefined micrometric analytical surface (pedestal of 80 mu m diameter). This hierarchical silicon surface exhibits a surface texture made of etched nanopillars and consists of micropillars and guiding lines, arranged in radial symmetry around the central pedestal. The guiding lines ensure the overall convergence of the sessile droplet toward the central pedestal during evaporation. The nanopillar texturing induced a delay in the Cassie-Baxter to Wenzel regime transition, until the edge of the droplet reaches the periphery of the pedestal. Experiments performed with polymer microparticles suspended in ultrapure water or with DNA molecules solubilized in ultrapure water at sub-fM concentrations demonstrated that the totality of the nonvolatile elements in the liquid microvolume is delivered on or close to the pedestal area, in a very reproducible manner. The very high concentration capacity of the device enabled the discrimination of the degree of purity of ultrapure water samples from different origins. The concentrator also turned out to be functional for raw water samples, opening possible applications to environmental analysis.
Not file

Dates and versions

hal-03880333 , version 1 (01-12-2022)

Identifiers

Cite

Victor Fabre, Franck Carcenac, Adrian Laborde, Jean Baptiste Doucet, Christophe Vieu, et al.. Hierarchical Superhydrophobic Device to Concentrate and Precisely Localize Water-Soluble Analytes: A Route to Environmental Analysis. Langmuir, 2022, 38 (46), pp.14249-14260. ⟨10.1021/acs.langmuir.2c01690⟩. ⟨hal-03880333⟩
0 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More