Large Area, Molecularly Smooth (0.2 nm rms) Gold Films for Surface Forces and Other Studies

Chai, Liraz; Klein, Jacob

doi:10.1021/la063738o

Cited by 90 publications

(135 citation statements)

References 55 publications

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“…However, once the film is exposed to the atmosphere, it rapidly becomes less hydrophilic. 35,36 We were able to confirm that the contact angle was 29°after it was taken out of the deposition chamber. However, the contact angle began to change rapidly; it reached 70°and saturated at that angle after 30 min.…”

Section: A Influence Of the Dimensional Parameters Of The Micropillamentioning

confidence: 73%

“…Although the change of the surface state is unavoidable, the contact angle on a gold surface exposed for a sufficiently long time seems to be fairly reproducible in comparison to the previous results presented by the other groups. 21,36,37 The roughness of the electrode surface is characterized by the variables in Eqs. ͑6͒ and ͑7͒.…”

Section: A Influence Of the Dimensional Parameters Of The Micropillamentioning

confidence: 99%

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Electrowetting on gold electrodes with microscopic three-dimensional structures for microfluidic devices

Yokomaku

Satoh

Fukuda

et al. 2008

Journal of Applied Physics

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To improve the performance of electrowetting-based microfluidic devices, we used micropillar structures to enhance the changes in the wettability of gold electrodes. The changes in the contact angle of a sessile drop were influenced by the diameter of the micropillars and interpillar distances. For a potential change between 0 V and −1.0 V, the change of the contact angle of the KCl sessile drop was 41°on a smooth electrode, but 88°on an electrode with micropillars with a 10 m diameter. Furthermore, the existence of the micropillars accelerated the change of the contact angle. The gold electrodes with the micropillars were used to generate the capillary force to mobilize a liquid column in a microflow channel. Compared to a device with a smooth electrode, this device showed a fourfold increase in the flow velocity at −0.9 V. The electrodes were also used as a valve. The ability to stop an intruding solution and the switching speed was improved with the micropillar structure.

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Section: A Influence Of the Dimensional Parameters Of The Micropillamentioning

confidence: 73%

Section: A Influence Of the Dimensional Parameters Of The Micropillamentioning

confidence: 99%

Electrowetting on gold electrodes with microscopic three-dimensional structures for microfluidic devices

Yokomaku

Satoh

Fukuda

et al. 2008

Journal of Applied Physics

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“…Chai & Klein created extremely smooth (though not atomicallysmooth) gold surfaces via template stripping [72], which could be used as one of the interacting substrates in the SFB [73]. In Fig.…”

Section: Lubrication By Hydrated Ionsmentioning

confidence: 99%

Hydration lubrication

2013

Self Cite

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Abstract:The hydration lubrication paradigm, whereby hydration layers are both strongly held by the charges they surround, and so can support large pressures without being squeezed out, and at the same time remain very rapidly relaxing and so have a fluid response to shear, provides a framework for understanding, controlling, and designing very efficient boundary lubrication systems in aqueous and biological media. This review discusses the properties of confined water, which-unlike organic solvents-retains its fluidity down to molecularly thin films. It then describes lubrication by hydrated ions trapped between charged surfaces, and by other hydrated boundary species including charged and zwitterionic polymer brushes, surfactant monolayers, liposomes, and biological macromolecules implicated in synovial joint lubrication. Finally, challenges and prospects for future development of this new boundary lubrication approach are considered.

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“…Self-assembled CH 3 and OH monolayers were prepared on molecularly smooth gold surfaces using a previously described technique (17,47). First, a 45-nm layer of gold was deposited onto a freshly cleaved mica surface using electron beam deposition.…”

Section: Mfp-3smentioning

confidence: 99%

Surface force measurements and simulations of mussel-derived peptide adhesives on wet organic surfaces

Levine

Rapp

Wei

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Translating sticky biological molecules-such as mussel foot proteins (MFPs)-into synthetic, cost-effective underwater adhesives with adjustable nano-and macroscale characteristics requires an intimate understanding of the glue's molecular interactions. To help facilitate the next generation of aqueous adhesives, we performed a combination of surface forces apparatus (SFA) measurements and replicaexchange molecular dynamics (REMD) simulations on a synthetic, easy to prepare, Dopa-containing peptide (MFP-3s peptide), which adheres to organic surfaces just as effectively as its wild-type protein analog. Experiments and simulations both show significant differences in peptide adsorption on CH 3 -terminated (hydrophobic) and OH-terminated (hydrophilic) self-assembled monolayers (SAMs), where adsorption is strongest on hydrophobic SAMs because of orientationally specific interactions with Dopa. Additional umbrella-sampling simulations yield free-energy profiles that quantitatively agree with SFA measurements and are used to extract the adhesive properties of individual amino acids within the context of MFP-3s peptide adhesion, revealing a delicate balance between van der Waals, hydrophobic, and electrostatic forces.mussel foot proteins | self-assembled monolayers | protein folding | molecular dynamics simulations | surface forces apparatus D emand for biologically inspired underwater adhesives, such as those secreted by marine mussels to adhere to a wide variety of hard and soft surfaces (1), have seen tremendous growth over the past decade, with applications to bone sealing (2), dental and medical transplants (3), coronary artery coatings (4), cell encapsulants (5), and other systems. To facilitate the construction of nextgeneration underwater adhesives, we can mimic existing biological glues-such as those containing mussel foot proteins (MFPs)-and translate the glues' structures to create biologically inspired synthetic adhesives (6). Doing so requires detailed knowledge of the molecular interactions that take place, many of which occur on length and time scales that are, at present, too small to be accurately characterized by experiments. Therefore, more sophisticated studies that combine theoretical modeling with state-of-the-art experiments are necessary for advancing the development of novel underwater adhesives.Although the mussel's talent for wet adhesion has been known for centuries, the true molecular understanding of adhesion began in 1952 with Brown's hypothesis that the mussel's byssus thread and adhesive plaques are comprised of intrinsically disordered proteins rich in the catecholic amino acid dopa (Dopa) (7). With knowledge of Dopa's binding ability, an abundance of Dopa-containing polymers were synthesized that displayed impressive adhesive (8, 9), coating (1, 4), structural (10, 11), and selfhealing (12, 13) properties. The surface forces apparatus (SFA) has been used to measure the adhesion of MFP-containing glues (1, 6, 14-17); however, it remains difficult to unambiguously identify individual or ...

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Large Area, Molecularly Smooth (0.2 nm rms) Gold Films for Surface Forces and Other Studies

Cited by 90 publications

References 55 publications

Electrowetting on gold electrodes with microscopic three-dimensional structures for microfluidic devices

Electrowetting on gold electrodes with microscopic three-dimensional structures for microfluidic devices

Hydration lubrication

Surface force measurements and simulations of mussel-derived peptide adhesives on wet organic surfaces

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