The hydrophilic nature of a clean gold surface

Smith, Tony

doi:10.1016/0021-9797(80)90348-3

Cited by 321 publications

(228 citation statements)

References 21 publications

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“…In accordance with the phenomena reported in literature, the oxidized gold substrates were hydrophilic, whereas the reduced gold substrates were hydrophobic 39,40 . X-ray photoelectron spectroscopy (XPS) was used to precisely determine the oxidization states of the freshly prepared gold surfaces.…”

Section: Resultssupporting

confidence: 91%

Quantifying thiol–gold interactions towards the efficient strength control

et al. 2014

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The strength of the thiol-gold interactions provides the basis to fabricate robust self-assembled monolayers for diverse applications. Investigation on the stability of thiol-gold interactions has thus become a hot topic. Here we use atomic force microscopy to quantify the stability of individual thiol-gold contacts formed both by isolated single thiols and in self-assembled monolayers on gold surface. Our results show that the oxidized gold surface can enhance greatly the stability of gold-thiol contacts. In addition, the shift of binding modes from a coordinate bond to a covalent bond with the change in environmental pH and interaction time has been observed experimentally. Furthermore, isolated thiol-gold contact is found to be more stable than that in self-assembled monolayers. Our findings revealed mechanisms to control the strength of thiol-gold contacts and will help guide the design of thiol-gold contacts for a variety of practical applications.

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Section: Resultssupporting

confidence: 91%

Quantifying thiol–gold interactions towards the efficient strength control

et al. 2014

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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 Micropillasupporting

confidence: 49%

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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“…Is it a matter of wettability? Smith (28) shows that since 1934 there have been at least eight studies, led by Zisman and his co-workers, which conclude that gold is wettable by water. In the same period, there were eighteen studies, led by Zettlemoyer and his co-workers, which conclude that gold is not wettable.…”

Section: Condensation On Solid Goldmentioning

confidence: 99%

Gold surfaces for condensation heat transfer

Westwater

1981

Gold Bull

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The hydrophilic nature of a clean gold surface

Cited by 321 publications

References 21 publications

Quantifying thiol–gold interactions towards the efficient strength control

Quantifying thiol–gold interactions towards the efficient strength control

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

Gold surfaces for condensation heat transfer

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