Construction of Compact Polyelectrolyte Multilayers Inspired by Marine Mussel: Effects of Salt Concentration and pH As Observed by QCM-D and AFM

Wang, Weina; Xu, Yisheng; Backes, Sebastian; Li, Ang; Micciulla, Samantha; Kayitmazer, A. Basak; Li, Li; Guo, Xuhong; Klitzing, Regine von

doi:10.1021/acs.langmuir.5b04706

Cited by 27 publications

(27 citation statements)

References 48 publications

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“…The increased tanδ was due to the interplay between the increase in water contents and crosslinking of metal chelation. Moreover, the chelation enhanced the cohesion while water decreased elastic modulus . Because of this chelation of Ca ions, our adhesive could maintain appropriate rheological properties for high enough energy dissipation and high enough elastic modulus although water as a plasticizer keeps decreasing both.…”

Section: Resultsmentioning

confidence: 69%

Calcium‐Modified Silk as a Biocompatible and Strong Adhesive for Epidermal Electronics

Seo

Kim

et al. 2018

Adv Funct Materials

153

147

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With the increasing interest and demand for epidermal electronics, a strong interface between a sensor and a biological surface is essential, yet achieving such interface is still a challenge. Here, a calcium (Ca)-modified biocompatible silk fibroin as a strong adhesive for epidermal electronics is proposed and the physical principles behind its interfacial and adhesive properties are reported. A strong adhesive characteristic (>800 N m −1 ) is observed because of the increase in both viscoelastic property and mechanical interlocking through the incorporation of Ca ions. Furthermore, additional key characteristics of the Ca-modified silk: reusability, stretchability, biocompatibility, and conductivity, are reported. These characteristics enable a wide range of applications as demonstrated in four epidermal electronic systems: capacitive touch sensor, resistive strain sensor, hydrogel-based drug delivery, and electrocardiogram monitoring sensor. As a reusable, biocompatible, conductive, and strong adhesive with water-degradability, the Ca-modified silk adhesive is a promising candidate for the next-generation adhesive for epidermal biomedical sensors.

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Section: Resultsmentioning

confidence: 69%

Calcium‐Modified Silk as a Biocompatible and Strong Adhesive for Epidermal Electronics

Seo

Kim

et al. 2018

Adv Funct Materials

153

147

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“…To build stable multilayers, optimum crosslinking degree is crucial. In fact, for PAADopa‐Zn layer with low crosslinking degree, the structure is too soft to confine the flexible PEI inside the multilayer with a loose structure during rinsing leading to following inefficient layer adsorption . On the other hand, with high crosslinking degree, it is facile to form aggregates in micron scale loosely bounded on top of the layer which can be easily flushed away during rinsing which ultimately leads to less polymer adsorption.…”

Section: Resultsmentioning

confidence: 99%

“…The PEI layer is sensitive to the ionic strength of the rinsing medium. Under high salt concentration (0.6 M NaCl) condition, the charge screen effect on polymer chains leads to stronger chain coiling and higher extrinsic charge compensation (higher mobility) . Therefore, salt is an important factor to trigger the odd‐even effect because at very high salt condition, the charge screening effect is more obvious to the PEI layer as this layer is more swollen with a more loose structure (reflected by the “spikes” of Δ f and Δ D at the beginning of each layer deposition).…”

Section: Resultsmentioning

confidence: 99%

“…The different behaviors of odd and even layers lead to rough surfaces with big loops for PEI layer and relatively flat conformation with compact structure of PAADopa‐Zn layer, as schematically demonstrated in Figure . When PEI is on top (the odd layer), this linear polymer forms coils and loops even under electrostatic interactions with the PAADopa‐Zn layer below.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, there has been great interest in the use of multilayers containing biomimetic polyelectrolytes due to the low toxicity, excellent biocompatibility, and modification efficiency . On the other hand, crosslinking strategies of multilayer are also studied for the formation of compact structures with tunable physicochemical properties …”

Section: Introductionmentioning

confidence: 99%

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Odd‐even effect during layer‐by‐layer assembly of polyelectrolytes inspired by marine mussel

Wang

Han

et al. 2016

J Polym Sci B Polym Phys

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Biomimetic polyelectrolyte of Dopa modified poly(acrylic acid) (PAADopa) was synthesized taking advantage of Dopa, the major unit of marine adhesive proteins. Zinc crosslinked PAADopa (PAADopa‐Zn) were formed at acidic pH for more compact structure and assembled with the positively charged polyethylenimine (PEI) to build robust polyelectrolyte multilayers at high salt concentration. Effects of pH, crosslinking degree, and salt concentration on polymer structure, film building process, and morphology were investigated, respectively. An “odd‐even” effect was observed by quartz crystal microbalance with dissipation and AFM in the presence of zinc ion, which becomes more obvious with an optimum crosslinking degree (Zn/Dopa = 2.0) under high salt concentration (0.6 M NaCl). It indicates the different swollen properties of PEI chain and PAADopa‐Zn complexes during the layer‐by‐layer building process under optimum crosslinking degree of PAADopa‐Zn at high salt concentration. Such odd‐even phenomenon of the biocompatible system is of critical importance for understanding the mechanism of layer formation and film structures. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 245–255

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Versatile Surface Modification Using Polydopamine and Related Polycatecholamines: Chemistry, Structure, and Applications

Barclay

Hegab

Clarke

et al. 2017

Adv Materials Inter

289

223

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Almost ten years ago, Lee et al. [13] formulated a universal adhesive coating based on observation of the strong attachment by mussels through their byssal threads to virtually all types of inorganic and organic surfaces. The amino acid compositions of the mussel foot proteins that generate the attachment are rich in catechol and amine groups. [13][14][15] These groups associate under marine conditions, forming strong covalent and noncovalent interactions with substrates. [13] This led to the idea that both catechol and amine groups were crucial in forming robust, wide spectrum adhesive nanolayers [16,17] and consequently dopamine was conceived as a powerful building block for spontaneous deposition of thin polymer films. The dopamine monomer is deposited onto unadulterated surfaces through self-assembly and oxidative cross-linking from mild pH aqueous solution in a rapid reaction. This results in a durable, nanoscale, conformal, and hydrophilic coating that can be readily modified to introduce specific surface chemistries for a particular application. [18][19][20][21][22] These bioinspired, polydopamine materials are chemically and structurally indistinguishable from eumelanins found in the human body, [23,24] providing excellent biocompatibility. Additionally, polydopamine has broad electromagnetic absorption and excellent photothermal energy conversion [25] as well as having ionic-electronic hybrid conductivity. [26] Along with the excellent coating performance, these properties provide a vast array of potential applications for polydopamine materials.In this article, we explain what is known about polydopamine and related catecholamine coatings; their formation, the adhesion mechanism, and their physicochemical properties and we also review the applications of these materials (Figure 1). Since 2011, there have been a number of reviews on this subject matter, including general reviews on the physicochemical properties of polydopamine coatings [11,20,[27][28][29] and their applications. [20,27,30] There are also a number of more specific reviews on the chemical synthesis and modulation of polycatecholamine coatings, [31] the biomedical applications of these coatings, [8,[32][33][34] their electronic properties, [26,35] the use of polydopamine to make films at fluid interfaces, [36] in hierarchically constructed particles, [33] and capsules, [30] exploitation of polycatecholamine coatings in membrane filtration, [37] polydopamine-derived carbon materials, [38] and the use of coordination chemistry in catechol-based materials. [39] Nonetheless, this area of research is growing so rapidly [25,27] that many recent Polydopamine and related polycatecholamines can be easily deposited onto almost any surface from mild, aqueous solution. This results in durable, nanoscale coatings that exhibit high biocompatibility and have useful chemical and electronic properties. Additionally, these materials can be readily chemically and physically modified, and consequently, they are used extensively for surface modification. This ...

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Construction of Compact Polyelectrolyte Multilayers Inspired by Marine Mussel: Effects of Salt Concentration and pH As Observed by QCM-D and AFM

Cited by 27 publications

References 48 publications

Calcium‐Modified Silk as a Biocompatible and Strong Adhesive for Epidermal Electronics

Calcium‐Modified Silk as a Biocompatible and Strong Adhesive for Epidermal Electronics

Odd‐even effect during layer‐by‐layer assembly of polyelectrolytes inspired by marine mussel

Versatile Surface Modification Using Polydopamine and Related Polycatecholamines: Chemistry, Structure, and Applications

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