Special wettability for sensing: Drawing inspiration from nature

Vineeth, P; Peethan, Alina; George, Sajan D.

doi:10.1016/j.cej.2023.141615

Cited by 9 publications

(10 citation statements)

References 107 publications

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“…In the absence of any chemical interactions, the adhesion strength is determined by the molecular physical interactions. The surface roughness also plays an important role [ 13 , 15 , 16 , 17 , 18 ]. The adhesion of a liquid to a solid surface is commonly investigated via the contact angle measurements, and then by the determination of the solid surface free energy and the thermodynamic work of adhesion.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Graffiti Coatings on Sensitive Surfaces Concerning Their Removal with Formulations Based on the Amino-Acid-Type Surfactants

et al. 2023

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Water-in-oil (w/o) nanoemulsions stabilized with amino acid surfactants (AAS) are one example of nanotechnology detergents of the “brush on, wipe off”-type for removing graffiti coatings from different sensitive surfaces. The high-pressure homogenization (HPH) process was used to obtain the nanostructured fluids (NSFs), including the non-toxic and eco-friendly components such as AAS, esterified vegetable oils, and ethyl lactate. The most effective NSF detergent was determined by response surface methodology (RSM) optimization. Afterwards, several surface properties, i.e., topography, wettability, surface free energy, and the work of water adhesion to surfaces before and after their coverage with the black graffiti paint, as well as after the removal of the paint layers by the eco-remover, were determined. It was found that the removal of graffiti with the use of the NSF detergent is more dependent on the energetic properties and microporous structure of the paint coatings than on the properties of the substrates on which the layers were deposited. The use of NSFs and knowledge of the surface properties could enable the development of versatile detergents that would remove unwanted contamination from various surfaces easily and in a controlled way.

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Section: Introductionmentioning

confidence: 99%

Surface Properties of Graffiti Coatings on Sensitive Surfaces Concerning Their Removal with Formulations Based on the Amino-Acid-Type Surfactants

et al. 2023

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Section: Other Detection Methodsmentioning

confidence: 99%

“…SERS is a highly sensitive analytical method that can detect and quantify various analytes, including metabolites, macromolecules, and microorganisms [123,124]. Raman scattering refers to the occurrence of a specific frequency shift in the scattered spectrum when incident light interacts with surface molecules, and this shift can be measured to investigate information about molecular structure and composition [125,126].…”

Section: Other Detection Methodsmentioning

confidence: 99%

Advances in Non-Electrochemical Sensing of Human Sweat Biomarkers: From Sweat Sampling to Signal Reading

Yang,

Sun,

Lai

et al. 2023

Biosensors

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Sweat, commonly referred to as the ultrafiltrate of blood plasma, is an essential physiological fluid in the human body. It contains a wide range of metabolites, electrolytes, and other biologically significant markers that are closely linked to human health. Compared to other bodily fluids, such as blood, sweat offers distinct advantages in terms of ease of collection and non-invasive detection. In recent years, considerable attention has been focused on wearable sweat sensors due to their potential for continuous monitoring of biomarkers. Electrochemical methods have been extensively used for in situ sweat biomarker analysis, as thoroughly reviewed by various researchers. This comprehensive review aims to provide an overview of recent advances in non-electrochemical methods for analyzing sweat, including colorimetric methods, fluorescence techniques, surface-enhanced Raman spectroscopy, and more. The review covers multiple aspects of non-electrochemical sweat analysis, encompassing sweat sampling methodologies, detection techniques, signal processing, and diverse applications. Furthermore, it highlights the current bottlenecks and challenges faced by non-electrochemical sensors, such as limitations and interference issues. Finally, the review concludes by offering insights into the prospects for non-electrochemical sensing technologies. By providing a valuable reference and inspiring researchers engaged in the field of sweat sensor development, this paper aspires to foster the creation of innovative and practical advancements in this domain.

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“…These surfaces enable droplet evaporation within a small area, thereby facilitating precise analysis. [ 6,17 − 21 ]…”

Section: Introductionmentioning

confidence: 99%

“…However, typical state‐of‐the‐art superhydrophobic surfaces are slippery with low sliding angles for droplets. Therefore, they need to be positioned using lithographic patterning processes [ 18,19,21 ] (i.e., optical lithography, [ 22 ] e‐beam lithography, [ 6 ] laser writing, [ 23 − 25 ] laser printing, [ 26 ] and particle assembly) [ 27 ] to locate the droplets, which renders the fabrication process complex, expensive, and time‐consuming. Although most superhydrophobic surfaces are slippery, sticky (adhesive) superhydrophobic surfaces have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Plasma‐Etched Nanograss Surface without Lithographic Patterning to Immobilize Water Droplet for Highly Sensitive Raman Sensing

Ho,

Yang,

Lin

et al. 2023

Adv Materials Inter

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The development of reliable, cost‐effective molecular detection at the attomolar level on analyte‐immobilizing surfaces fabricated without lithographic patterning remains a major challenge in chemical sensing technology. This issue is addressed using custom‐designed adhesive superhydrophobic silicon nanograss surfaces produced via plasma etching. When applied to ultrasensitive surface‐enhanced Raman scattering, the nanograss surface enables effective immobilization of water droplets containing Ag nanoparticles and R6G target molecules. Upon water evaporation, the R6G analytes are confined at the edge of the self‐organized coffee‐ring‐like stains with the plasmonic hot spots of the Ag nanoparticles, thus providing a reliable Raman scattering platform for detecting trace analytes. Even at an ultralow concentration of 10−16 m, the corresponding relative standard deviation is 17.57%. A novel plasma‐enabled approach for precise interface nanostructuring, potentially leading to unprecedented capabilities in molecular‐level sensing technologies, is presented.

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Special wettability for sensing: Drawing inspiration from nature

Cited by 9 publications

References 107 publications

Surface Properties of Graffiti Coatings on Sensitive Surfaces Concerning Their Removal with Formulations Based on the Amino-Acid-Type Surfactants

Surface Properties of Graffiti Coatings on Sensitive Surfaces Concerning Their Removal with Formulations Based on the Amino-Acid-Type Surfactants

Advances in Non-Electrochemical Sensing of Human Sweat Biomarkers: From Sweat Sampling to Signal Reading

Plasma‐Etched Nanograss Surface without Lithographic Patterning to Immobilize Water Droplet for Highly Sensitive Raman Sensing

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