Probing Hydrophilic Interface of Solid/Liquid-Water by Nanoultrasonics

Mante, Pierre‐Adrien; Chen, Chien‐Cheng; Wen, Yu-Chieh; Chen, Huiyuan; Yang, Shih-Chin; Huang, Yuru; Chen, I. Ju; Chen, Yun-Wen; Gusev, Vitalyi; Chen, Miin-Jang; Kuo, Jer‐Lai; Sheu, Jinn-Kong; Sun, Chi‐Kuang

doi:10.1038/srep06249

Cited by 47 publications

(47 citation statements)

References 39 publications

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“…Adsorbed mfp3S-pep-3Dopa and its coacervate showed a broad negative band decreasing with time due to the absorbance reduction of the νOH mode associated with water molecules on the TiO 2 nanoparticle surface. [29] A positive peak at 3250 cm −1 due to the νNH mode of the peptide bonds further confirms that the adsorption of peptide molecules (positive absorbance) causes the loss of interfacial water (negative absorbance). Surface-bound water molecules are also present as a hydration layer around the adsorbate and dislodged by direct adsorbate–surface interactions.…”

Section: Resultsmentioning

confidence: 74%

An Underwater Surface‐Drying Peptide Inspired by a Mussel Adhesive Protein

Wei

Petrone

Tan

et al. 2016

Adv Funct Materials

183

168

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Water hampers the formation of strong and durable bonds between adhesive polymers and solid surfaces, in turn hindering the development of adhesives for biomedical and marine applications. Inspired by mussel adhesion, a mussel foot protein homologue (mfp3S-pep) is designed, whose primary sequence is designed to mimic the pI, polyampholyte, and hydrophobic characteristics of the native protein. Noticeably, native protein and synthetic peptide exhibit similar abilities to self-coacervate at given pH and ionic strength. 3,4-dihydroxy-l-phenylalanine (Dopa) proves necessary for irreversible peptide adsorption to both TiO2 (anatase) and hydroxyapatite (HAP) surfaces, as confirmed by quartz crystal microbalance measurements, with the coacervate showing superior adsorption. The adsorption of Dopa-containing peptides is investigated by attenuated total reflection infrared spectroscopy, revealing initially bidentate coordinative bonds on TiO2, followed by H-bonded and eventually long-ranged electrostatic and Van der Waals interactions. On HAP, mfp3s-pep-3Dopa adsorption occurs predominantly via H-bond and outer-sphere complexes of the catechol groups. Importantly, only the Dopa-bearing compounds are able to remove interfacial water from the target surfaces, with the coacervate achieving the highest water displacement arising from its superior wetting properties. These findings provide an impetus for developing coacervated Dopa-functionalized peptides/polymers adhesive formulations for a variety of applications on wet polar surfaces.

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Section: Resultsmentioning

confidence: 74%

An Underwater Surface‐Drying Peptide Inspired by a Mussel Adhesive Protein

Wei

Petrone

Tan

et al. 2016

Adv Funct Materials

183

168

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“…Because it can be prepared as an atomically flat sample, it is suitable for a range of sophisticated methods that are not applicable to rougher surfaces, including X-ray reflectivity [38,39,63], high-resolution AFM that is able to show hydration layers [64], or ions on mica [65] or nanoultrasonics [66], to name a few such approaches. The literature on macroscopic data on mica is also abundant.…”

Section: Mica Basal Planementioning

confidence: 99%

Charging Behavior of Clays and Clay Minerals in Aqueous Electrolyte Solutions — Experimental Methods for Measuring the Charge and Interpreting the Results

Preočanin¹,

Abdelmonem²,

Montavon³

et al. 2016

Clays, Clay Minerals and Ceramic Materials Based on Clay Minerals

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We discuss the charging behavior of clays and clay minerals in aqueous electrolyte solutions. Clay platelets exhibit different charging mechanisms on the various surfaces they expose to the solution. Thus, the basal planes have a permanent charge that is typically considered to be independent of pH, whereas the edge surfaces exhibit the amphoteric behavior and pH-dependent charge that is typical of oxide minerals. Background electrolyte concentration and composition may affect these two different mechanisms of charging in different ways. To guide and to make use of these unique properties in technical application, it is necessary to understand the effects of the various master variables (i.e. pH and background salt composition and concentration). However, how to disentangle the various contributions to the charge that is macroscopically measurable via conventional approaches (i.e. electrokinetics, potentiometric titrations, etc.) remains a challenge. The problem is depicted by discussing in detail the literature data on kaolinite obtained with crystal face specificity. Some results from similar experiments on related substrates are also discussed. As an illustration of the complexity, we have carried out extensive potentiometric mass and electrolyte titrations on artificial clay samples (Na-, Ca-, and Mgmontmorillonite). A wide variety of salts was used, and it was found that the different electrolytes had different effects on the end point of mass titrations. In the case of a purified sample (i.e. no acid-base impurities), the end point of a mass titration (the plateau of pH achieved for the highest concentrations of solid), in principle, corresponds to the point of zero net proton and hydroxide consumption, at which in ideal systems, such as oxide minerals, the net proton surface charge density is zero. To such concentrated (dense) suspensions of clay particles, aliquots of salts can be added and the resulting pH indicates the specificity of a given salt for a given clay particle system. In the experimental data, some ambiguity remains, which calls for further detailed and comprehensive studies involving the application of all the available techniques to one system. Although, right now, the overall picture appears to be clear from a generic point of view (i.e. concerning the trends), clearly, in a quantitative sense, huge differences occur for nominally identical systems and only such a comprehensive study will allow to proof the current phenomenological picture and allow the next step to be taken to understand the fine details of the complex clay-electrolyte solution interfaces.

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“…It justifies to neglect the elastic component of the bulk shear viscosity in the present study, considering that the Maxwell relaxation time of the bulk shear viscosity [42,43] is at most comparable to t λ . The frequency range ω > 1 corresponds to the gigahertz range for a simple liquid (for argon ω = 1 means 74.4 GHz), which can be reached by a recent nanoultrasonic measurement technique [44] to probe the interfacial rheology.…”

Section: A Identification Of the Hydrodynamic Boundary Conditionmentioning

confidence: 99%

Full characterization of the hydrodynamic boundary condition at the atomic scale using an oscillating channel: Identification of the viscoelastic interfacial friction and the hydrodynamic boundary position

et al. 2019

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Flows in nanofluidic systems are controlled by the hydrodynamic boundary condition (BC), involving the friction coefficient and the hydrodynamic wall position. Here we considered a liquid nanoslab confined between two walls, where we derived, from the Stokes equation and the Navier slip BC, analytical expressions for the liquid response to an oscillatory tangential motion of the walls in terms of the wall shear stress and mean fluid velocity. By fitting these expressions to molecular dynamics simulation results, we could extract both the viscoelastic friction coefficient and hydrodynamic wall position for walls with three different wettabilities, hence fully characterizing the frequency-dependent hydrodynamic boundary condition. The proposed method could be applied to a variety of liquid-solid interfaces of interest, e.g., for flows of complex fluids or fluids at a low temperature. It should also support methodological developments on the characterization of the hydrodynamic slip in general.

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Probing Hydrophilic Interface of Solid/Liquid-Water by Nanoultrasonics

Cited by 47 publications

References 39 publications

An Underwater Surface‐Drying Peptide Inspired by a Mussel Adhesive Protein

An Underwater Surface‐Drying Peptide Inspired by a Mussel Adhesive Protein

Charging Behavior of Clays and Clay Minerals in Aqueous Electrolyte Solutions — Experimental Methods for Measuring the Charge and Interpreting the Results

Full characterization of the hydrodynamic boundary condition at the atomic scale using an oscillating channel: Identification of the viscoelastic interfacial friction and the hydrodynamic boundary position

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