Critical analysis of adhesion work measurements from AFM-based techniques for soft contact

Sychev, Dmitrii; Schubotz, Simon; Besford, Quinn A.; Fery, Andreas; Auernhammer, Günter K.

doi:10.1016/j.jcis.2023.03.139

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…Additional AFM force–distance curves acquired on the investigated film coatings, and reported in the Supporting Information, [ 67–69 ] further confirm that the a‐PVA:Li undergoes a larger plastic deformation than PVA:Li and which is correlated to a higher dissipation energy, a lower stiffness, and a higher work of adhesion (49 N m −1 and 20 pJ in a‐PVA:Li; 74 N m −1 and 13 pJ in PVA:Li, Table S6, Supporting Information). [ 68 ]…”

Section: Resultsmentioning

confidence: 54%

Boosting Contact Electrification by Amorphous Polyvinyl Alcohol Endowing Improved Contact Adhesion and Electrochemical Capacitance

Serairi,

Santillo,

Basset

et al. 2024

Advanced Materials

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Ion conductive hydrogels are relevant components in wearable, biocompatible and biodegradable electronics. Polyvinyl‐alcohol (PVA) homopolymer is often the favoured choice for integration into supercapacitors and energy harvesters as in sustainable triboelectric nanogenerators (TENGs). However, to further improve hydrogel‐based TENGs, a deeper understanding of the impact of their composition and structure on devices performance is necessary. We show ionic hydrogels based on an amorphous‐PVA (a‐PVA) allowing to fabricate TENGs that outperform the one based on the homopolymer. When used as tribomaterial, the Li‐doped a‐PVA allows to achieve a 2‐fold higher pressure sensitivity compared to PVA, and to develop a conformable e‐skin. When used as an ionic conductor encased in an elastomeric tribomaterial, 100 mW/cm2 average power is achieved, providing 25% power increase compared to PVA. At the origin of such enhancement is the increased softness, stronger adhesive contact, higher ionic mobility (> 3,5‐fold increase), and long‐term stability achieved with Li‐doped a‐PVA. These improvements are attributed to the high density of hydroxyl groups and amorphous structure present in the a‐PVA, allowing a strong binding to water molecules. This work discloses novel insights on those parameters allowing to develop easy‐processable, stable and highly conductive hydrogels for integration in conformable, soft and biocompatible TENGs.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 54%

Boosting Contact Electrification by Amorphous Polyvinyl Alcohol Endowing Improved Contact Adhesion and Electrochemical Capacitance

Serairi,

Santillo,

Basset

et al. 2024

Advanced Materials

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“…These findings were in line with the previous work. [32] The thickness values were extracted by comparing force-distance curves from the films to a clean glass surface, normalizing them on the onset point of the force (0.05 nm cantilever deflection). Deposition of the polymer matter onto the probe surface, while not affecting the retraction part of the force-distance curve and calculation of w f , hindered the determination of the thickness of the nanogel layer in 1propanol solution.…”

Section: Resultsmentioning

confidence: 99%

Surface Topology of Redox‐ and Thermoresponsive Nanogel Droplets

Hofmann,

Sychev,

Zagradska‐Paromova

et al. 2024

Macromol. Rapid Commun.

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Hydrogels are usually depicted as a homogenous polymer block with a distinct surface. While defects in the polymer structure are looked into frequently, structural irregularities on the hydrogel surface are often neglected. In this work, thin hydrogel layers of about 100 nm thickness (nanogels) have been synthesised and characterised for their structural irregularities, as they represent the surface of macrogels. The nanogels contain a main‐chain responsiveness (thermo responsive) and a responsiveness in the cross‐linking points (redox responsive). In combining data from ellipsometry using box‐model and two‐segment‐model analysis, as well as atomic force microscopy, a more defined model of the nanogel surface could be developed. Starting with a more densely cross‐linked network at the silica wafer surface, density of cross‐linking gradually decreased towards the hydrogel‐solvent interface. Thermo‐responsive behaviour of the main chain affected the entire network equally as all chain segments changed solubility. Cross‐linker based redox‐responsiveness, on the other hand, was only governed by the inner, more cross‐linked layers of the network. Such dual responsive nanogels hence allowed for developing a more detailed model of a hydrogel surface from free radical polymerisation. It provides a better understanding of structural defects in hydrogels and how they are affected by responsive functionalities.This article is protected by copyright. All rights reserved

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Bonding mechanism of laser joining of Poly-Ether-Ether-Ketone film which used for 5G antenna substrate to copper foil

Hao,

Zhao,

et al. 2023

Journal of Manufacturing Processes

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Critical analysis of adhesion work measurements from AFM-based techniques for soft contact

Cited by 5 publications

References 40 publications

Boosting Contact Electrification by Amorphous Polyvinyl Alcohol Endowing Improved Contact Adhesion and Electrochemical Capacitance

Boosting Contact Electrification by Amorphous Polyvinyl Alcohol Endowing Improved Contact Adhesion and Electrochemical Capacitance

Surface Topology of Redox‐ and Thermoresponsive Nanogel Droplets

Bonding mechanism of laser joining of Poly-Ether-Ether-Ketone film which used for 5G antenna substrate to copper foil

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