The Intersection of Interfacial Forces and Electrochemical Reactions

Israelachvili, Jacob N.; Kristiansen, Kai; Gebbie, Matthew A.; Lee, Dong Woog; Donaldson, Stephen H.; Das, Saurabh; Rapp, M.; Banquy, Xavier; Valtiner, Markus; Yu, Jing

doi:10.1021/jp408144g

Cited by 17 publications

(15 citation statements)

References 82 publications

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“…Unlike nuclear forces, however, electromagnetism prompts long-range interactions making it deterministic for condensed matter [17]. Even minute displacement of charges can result in macroscopically observable phenomena [18][19][20][21][22][23][24][25][26][27][28]. Similarly, with the development of metamaterials, controlling nanometer-scale CT allows for an emergence of unprecedented properties.…”

Section: Introductionmentioning

confidence: 99%

Building blocks for bioinspired electrets: molecular-level approach to materials for energy and electronics

Larsen

Espinoza

Hartman

et al. 2015

Pure and Applied Chemistry

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In biology, an immense diversity of protein structural and functional motifs originates from only 20 common proteinogenic native amino acids arranged in various sequences. Is it possible to attain the same diversity in electronic materials based on organic macromolecules composed of non-native residues with different characteristics? This publication describes the design, preparation and characterization of non-native aromatic β-amino acid residues, i.e. derivatives of anthranilic acid, for polyamides that can efficiently mediate hole transfer. Chemical derivatization with three types of substituents at two positions of the aromatic ring allows for adjusting the energy levels of the frontier orbitals of the anthranilamide residues over a range of about one electronvolt. Most importantly, the anthranilamide residues possess permanent electric dipoles, adding to the electronic properties of the bioinspired conjugates they compose, making them molecular electrets.

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Section: Introductionmentioning

confidence: 99%

Building blocks for bioinspired electrets: molecular-level approach to materials for energy and electronics

Larsen

Espinoza

Hartman

et al. 2015

Pure and Applied Chemistry

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“…There are two distinct experimental approaches for investigating IL–solid interfaces: (1) indirect measurements of the buried interface of a bulk IL and (2) direct investigations of the structure and physical properties of thin film ILs (TF-ILs) grown on the nanoscale. In the former approach, various sophisticated and sensitive interface analysis techniques, including atomic force microscopy (AFM), − surface force apparatus (SFA), − X-ray reflectometry (XRR), ,, neutron reflectometry, sum-frequency generation (SFG) spectroscopy, − and surface-enhanced infrared absorption spectroscopy (SEIRAS), , have been employed so far. Most of the results from these techniques indicate pronounced structuring and molecular layering in the region close to the solid surface within several nanometers.…”

mentioning

confidence: 99%

Ionic Conductivity in Ionic Liquid Nano Thin Films

et al. 2018

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Thin film approaches are powerful methods for gaining a nanoscale understanding of interfacial ionic liquids (ILs) in the vicinity of solids. These approaches are used to directly elucidate the interfacial contributions to the physical properties of ILs as nanoscale thin films have significant proportions of the surface or interface region with respect to their total volume. Here, we report the growth of a uniform [emim][TFSA] thin film ionic liquid on a chemically modified, well-wettable sapphire, thereby allowing the in situ measurement of its ionic conductivity on the nanoscale. We observed the thickness-dependent behavior of the ionic conductivity, which gradually decreased especially when the thickness was less than 10 nm, and found it to be quantitatively analyzed well by using an empirical two-layer model. The molecular dynamics (MD) simulations show that the thickness-dependent ionic conductivity originates from the solid-like structuring of the IL near the substrate, reproducing a thickness-dependent ionic conductivity. The MD simulation results suggest that the thickness of the low conductivity region determined in the two-layer model should roughly correspond to the thickness of the solid-like structuring of the IL near the substrate.

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“…36 The electrochemical potential was controlled using a Gamry potentiostat (Reference 600 Series). A total of 5 μL of 50 μg/mL of the mfp-1 ( Mc ; or 10 μL of 20–100 μg/ mL mfp-1 ( Me ) was dissolved in 1 mL buffer solution (10 mM NaCl and pH 3.7) and a triangular wave potential sweep was applied on the WE between chosen negative and positive limits and the cycle was repeated three times from measuring CV profiles.…”

Section: Methodsmentioning

confidence: 99%

Tough Coating Proteins: Subtle Sequence Variation Modulates Cohesion

Das¹,

Miller²,

Kaufman³

et al. 2015

Biomacromolecules

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Mussel foot protein-1 (mfp-1) is an essential constituent of the protective cuticle covering all exposed portions of the byssus (plaque and the thread) that marine mussels use to attach to intertidal rocks. The reversible complexation of Fe3+ by the 3,4-dihydroxyphenylalanine (Dopa) side chains in mfp-1 in Mytilus californianus cuticle is responsible for its high extensibility (120%) as well as its stiffness (2 GPa) due to the formation of sacrificial bonds that help to dissipate energy and avoid accumulation of stresses in the material. We have investigated the interactions between Fe3+ and mfp-1 from two mussel species, M. californianus (Mc) and M. edulis (Me), using both surface sensitive and solution phase techniques. Our results show that although mfp-1 homologues from both species bind Fe3+, mfp-1 (Mc) contains Dopa with two distinct Fe3+-binding tendencies and prefers to form intramolecular complexes with Fe3+. In contrast, mfp-1 (Me) is better adapted to intermolecular Fe3+ binding by Dopa. Addition of Fe3+ did not significantly increase the cohesion energy between the mfp-1 (Mc) films at pH 5.5. However, iron appears to stabilize the cohesive bridging of mfp-1 (Mc) films at the physiologically relevant pH of 7.5, where most other mfps lose their ability to adhere reversibly. Understanding the molecular mechanisms underpinning the capacity of M. californianus cuticle to withstand twice the strain of M. edulis cuticle is important for engineering of tunable strain tolerant composite coatings for biomedical applications.

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The Intersection of Interfacial Forces and Electrochemical Reactions

Cited by 17 publications

References 82 publications

Building blocks for bioinspired electrets: molecular-level approach to materials for energy and electronics

Building blocks for bioinspired electrets: molecular-level approach to materials for energy and electronics

Ionic Conductivity in Ionic Liquid Nano Thin Films

Tough Coating Proteins: Subtle Sequence Variation Modulates Cohesion

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