Composition‐dependent underwater adhesion of catechol‐bearing hydrogels

Wu, Haosheng; Sariola, Veikko; Zhao, Jingsi; Ding, Hongyan; Sitti, Metin; Bettinger, Christopher J.

doi:10.1002/pi.5246

Cited by 18 publications

(17 citation statements)

References 34 publications

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“…Several studies report optimum catechol contents between these extremes,close to 10-15 mol %. [85,87,107] This parameter is also strongly dependent on the molecular weight of the polymer (Figure 8). [100] Overall, lowmolecular-weight species have better mobility and, therefore, provide better wetting for enhanced interaction with the surface.…”

Section: Catechol Content and Molecular Weightmentioning

confidence: 98%

The Chemistry behind Catechol‐Based Adhesion

et al. 2018

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The adhesion of some marine organisms to almost any kind of surface in wet conditions has aroused increasing interest in recent decades. Numerous fundamental studies have been performed to understand the scientific basis of this behaviour, with catechols having been found to play a key role. Several novel bio-inspired adhesives and coatings with value-added performances have been developed by taking advantage of the knowledge gained from these studies. To date there has been no detailed overview focusing exclusively on the complex mode of action of these materials. The aim of this Review is to present recent investigations that elucidate the origin of the strong and versatile adsorption capacities of the catechol moiety and the effects of extrinsic factors that play important roles in the overall adhesion process, such as pH value, solvent, and the presence of metal ions. The aim is to detail the chemistry behind the astonishing properties of natural and synthetic catechol-based adhesive materials.

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Section: Catechol Content and Molecular Weightmentioning

confidence: 98%

The Chemistry behind Catechol‐Based Adhesion

et al. 2018

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“…To this end, bioinspired materials design strategies enable the transfer printing of electronic structures to hydrogel-based substrates (Wu et al, 2015). Bioinspired adhesive motifs promote interfacial bonding between hydrogel substrates and many electronic materials such as noble metals, oxides, and polymers (Wu et al, 2016).…”

Section: Advances In Transfer Printing and Heterogeneous Device Integmentioning

confidence: 99%

Recent advances in materials and flexible electronics for peripheral nerve interfaces

Bettinger

2018

Bioelectron Med

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Peripheral nerve interfaces are a central technology in advancing bioelectronic medicines because these medical devices can record and modulate the activity of nerves that innervate visceral organs. Peripheral nerve interfaces that use electrical signals for recording or stimulation have advanced our collective understanding of the peripheral nervous system. Furthermore, devices such as cuff electrodes and multielectrode arrays of various form factors have been implanted in the peripheral nervous system of humans in several therapeutic contexts. Substantive advances have been made using devices composed of off-the-shelf commodity materials. However, there is also a demand for improved device performance including extended chronic reliability, enhanced biocompatibility, and increased bandwidth for recording and stimulation. These aspirational goals manifest as much needed improvements in device performance including: increasing mechanical compliance (reducing Young's modulus and increasing extensibility); improving the barrier properties of encapsulation materials; reducing impedance and increasing the charge injection capacity of electrode materials; and increasing the spatial resolution of multielectrode arrays. These proposed improvements require new materials and novel microfabrication strategies. This mini-review highlights selected recent advances in flexible electronics for peripheral nerve interfaces. The foci of this mini-review include novel materials for flexible and stretchable substrates, non-conventional microfabrication techniques, strategies for improved device packaging, and materials to improve signal transduction across the tissue-electrode interface. Taken together, this article highlights challenges and opportunities in materials science and processing to improve the performance of peripheral nerve interfaces and advance bioelectronic medicine.

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“…Force–Displacement Measurements in Aqueous Conditions : Force–displacement curves were generated using a previously published method and equipment description . Briefly, PDMS or PDMS + SiO 2 probes were mounted on a 25 g load cell (GSO‐25, Transducer Techniques, Temecula, CA, USA) attached to a stack of a vertical motorized stage (MFA‐CC, Newport Corporation, Irving, CA, USA) for vertical motion and a manual tilting stage (GON40‐L, Newport Corporation) for alignment.…”

Section: Methodsmentioning

confidence: 99%

Reversible Chemo‐Topographic Control of Adhesion in Polydopamine Nanomembranes

Chiang

Tang

Kwon

et al. 2018

Macro Materials & Eng

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The use of polydopamine nanomembranes as a conformal coating with reversible adhesion is demonstrated. Here, two approaches to achieve reversible adhesion in polydopamine nanomembranes are reported: 1) controlling the surface chemistry using pH and 2) altering the texture through mechanical strain. pH‐dependent reversible adhesion in an aqueous environment can achieve differential pull‐off force of ≈0 and 1.93 ± 0.39 mN. Strain‐dependent adhesion in dry environments can produce between 0.26 ± 0.04 and 1.48 ± 0.06 mN, a range of 5.7 times difference. A theoretical framework based on elliptical Johnson–Kendall–Roberts theory to describe the relation between adhesion and the sinusoidal microtexture geometry is proposed. This model is in good agreement with experimentally determined values for interfacial adhesion in dry environments.

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Composition‐dependent underwater adhesion of catechol‐bearing hydrogels

Cited by 18 publications

References 34 publications

The Chemistry behind Catechol‐Based Adhesion

The Chemistry behind Catechol‐Based Adhesion

Recent advances in materials and flexible electronics for peripheral nerve interfaces

Reversible Chemo‐Topographic Control of Adhesion in Polydopamine Nanomembranes

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