Direct Correlation between Local Pressure and Fluorescence Output in Mechanoresponsive Polyelectrolyte Brushes

Bünsow, Johanna; Erath, Johann; Biesheuvel, P.M.; Fery, Andreas; Huck, Wilhelm T. S.

doi:10.1002/anie.201102560

Cited by 28 publications

(34 citation statements)

References 22 publications

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“…In a previous article, we demonstrated its responsiveness to compressive and tensile stress. 43,45 Schematically, the mechanism is shown in Figure 2a.…”

Section: Resultsmentioning

confidence: 99%

“…On the contrary, tension further stretches the chains and decreases the quenching, generating a higher fluorescence intensity. 43 Accordingly, compressive and tensile stresses can be distinguished from the local fluorescence intensity and read-out optically with the high spatial resolution of confocal laser scanning microscopy (CLSM). We combined the micro-contact printing setup with a confocal laser scanning microscope to monitor the fluorescence response of the mechano-sensitive surface during approach and retraction of the microstructures (Figures 2b and S1).…”

Section: Resultsmentioning

confidence: 99%

“…43 Briefly, round cover slips were used as substrates. They were cleaned by sonication and oxygen plasma treatment, directly followed by immersion into a solution of surface-initiator in toluene.…”

Section: Preparation Of Mechano-sensitive Surfacesmentioning

confidence: 99%

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 6 We have recently introduced a novel type of mechano-sensitive polymeric layer for resolving local stresses on the micrometer scale. 43 This mechano-sensitive surface coating is generated in a surface-initiated polymerization, resulting in a polyelectrolyte brush structure. It is labeled with a fluorescent dye that can be quenched by the polyelectrolyte brush.…”

mentioning

confidence: 99%

“…We use mechano-sensitive surfaces 43,44 to determine the contact stress distributions of biomimetic micropillar structures with flat punch and T-shape geometry. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 6 We have recently introduced a novel type of mechano-sensitive polymeric layer for resolving local stresses on the micrometer scale.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Monitoring the Contact Stress Distribution of Gecko-Inspired Adhesives Using Mechano-Sensitive Surface Coatings

Neubauer

Xue

Erath

et al. 2016

ACS Appl. Mater. Interfaces

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The contact geometry of microstructured adhesive surfaces is of high relevance for adhesion enhancement. Theoretical considerations indicate that the stress distribution in the contact zone is crucial for the detachment mechanism, but direct experimental evidence is missing so far. In this work, we propose a method that allows, for the first time, the detection of local stresses at the contact area of biomimetic adhesive microstructures during contact formation, compression and detachment. We use a mechano-sensitive polymeric layer, which turns mechanical stresses into changes of fluorescence intensity. The biomimetic surface is brought into contact with this layer in a well-defined fashion using a microcontact printer, while the contact area is monitored with fluorescence microscopy in situ. Thus, changes in stress distribution across the contact area during compression and pull-off can be visualized with a lateral resolution of 1 μm. We apply this method to study the enhanced adhesive performance of T-shaped micropillars, compared to flat punch microstructures. We find significant differences in the stress distribution of the both differing contact geometries during pull-off. In particular, we find direct evidence for the suppression of crack nucleation at the edge of T-shaped pillars, which confirms theoretical models for the superior adhesive properties of these structures.

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“…In a previous article, we demonstrated its responsiveness to compressive and tensile stress. 43,45 Schematically, the mechanism is shown in Figure 2a.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Preparation Of Mechano-sensitive Surfacesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Monitoring the Contact Stress Distribution of Gecko-Inspired Adhesives Using Mechano-Sensitive Surface Coatings

Neubauer

Xue

Erath

et al. 2016

ACS Appl. Mater. Interfaces

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Messenger Materials Moving Forward: The Role of Functional Polymer Architectures as Enablers for Dynamic Nano‐to‐Macro Messaging

Besford

Roßner

Fery

2023

Adv Funct Materials

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Identifying changes in the nanoscopic domain is a key challenge in the physicochemical sciences, where great interest is on sensing complex processes that involve cellular biochemical reactions, chemical heterogeneities, contact forces, and other interfacial phenomena. This has stimulated the development of diverse materials that allow subtle nanoscopic environments to be "seen". The challenge in the nano‐domain has always been the ability to sense changes on the minute scale and rapidly transduce the information out for macroscopical observation. Ideally, materials should inform when processes are occurring. Recently, new systems that leverage established concepts with fluorescence‐ and plasmonic‐based sensing have been devised, which has reinvigorated the domain, where functional polymers coupled in specific architectures to transducing motifs allow for a new basis of messenger materials to be realized. The key aspect in this regard is that the polymers allow for sensing to be achieved only when they are carefully coupled to the amplification system. In this perspective, the role of specific functional polymer architectures for the realization of nano‐to‐macro sensing of subtle nano‐messengers is discussed and where the exciting field of messenger materials is seen moving forward is pointed out.

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Pyroelectric Polyelectrolyte Brushes

Wang,

Hu,

Sant

et al. 2024

Advanced Materials

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Piezo‐ and pyroelectric materials are of interest, for example, for energy harvesting applications, for the development of tactile sensors, as well as neuromorphic computing. This study reports the observation of pyro‐ and piezoelectricity in thin surface‐attached polymer brushes containing zwitterionic and electrolytic side groups that are prepared via surface‐initiated polymerization. The pyro‐ and piezoelectric properties of the surface‐grafted polyelectrolyte brushes are found to sensitively depend on and can be tuned by variation of the counterion. The observed piezo‐ and pyroelectric properties reflect the structural complexity of polymer brushes, and are attributed to a complex interplay of the non‐uniform segment density within these films, together with a non‐uniform distribution of counterions and specific ion effects. The fabrication of thin pyroelectric films by surface‐initiated polymerization is an important addition to the existing strategies towards such materials. Surface‐initiated polymerization, in particular, allows for facile grafting of polar thin polymer films from a wide range of substrates via a straightforward two‐step protocol that obviates the need for multistep laborious synthetic procedures or thin film deposition protocols. The ability to produce polymer brushes with piezo‐ and pyroelectric properties opens up new avenues of application of these materials, for example, in energy harvesting or biosensing.This article is protected by copyright. All rights reserved

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Direct Correlation between Local Pressure and Fluorescence Output in Mechanoresponsive Polyelectrolyte Brushes

Cited by 28 publications

References 22 publications

Monitoring the Contact Stress Distribution of Gecko-Inspired Adhesives Using Mechano-Sensitive Surface Coatings

Monitoring the Contact Stress Distribution of Gecko-Inspired Adhesives Using Mechano-Sensitive Surface Coatings

Messenger Materials Moving Forward: The Role of Functional Polymer Architectures as Enablers for Dynamic Nano‐to‐Macro Messaging

Pyroelectric Polyelectrolyte Brushes

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