Detection of novel gaseous states at the highly oriented pyrolytic graphite-water interface

Xue Hua Zhang; Xiaodong Zhang; Jielin Sun; Zhixiang Zhang; Gang Li; Haiping Fang; Xudong Xiao; Xiaocheng Zeng; Jun Hu

doi:10.1021/la062278w

Detection of novel gaseous states at the highly oriented pyrolytic graphite-water interface

Xue Hua Zhang^*
, Xiaodong Zhang
, Jielin Sun
, Zhixiang Zhang
, Gang Li
, Haiping Fang
, Xudong Xiao^*
, Xiaocheng Zeng^*
, Jun Hu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

154 Citations (Scopus)

Abstract

We report a novel form of the gaseous state at the interface of water and highly oriented pyrolytic graphite (HOPG) that is induced by local supersaturation of gas. Such local supersaturation of gas next to the HOPG substrate can be achieved by (1) displacing an organic liquid with a gentle flow of water, (2) displacing cold water (∼0 °C) with a gentle flow of warm water (∼40 °C), or (3) preheating the HOPG substrate to ∼80 °C before exposing it to water at room temperature. In addition to the spherical-cap-shaped nanobubbles reported by many researchers, flat (quasitwo-dimensional, pancake-like) gas layers and nanobubble-flat gas layer composites (spherical-cap-shaped nanobubbles sitting on top of the quasi-two-dimensional gas layers) were detected. These entities disappeared after the system was subjected to a moderate level of degassing (∼0.1 atm for 1.5 h), and they did not form when the liquids involved in the aforementioned displacing procedure (to induce local supersaturation of gas) had been predegassed (to ∼0.1 atm). The stability and some physical properties of these newly found gaseous states are examined. © 2007 American Chemical Society.

Original language	English
Pages (from-to)	1778-1783
Journal	Langmuir
Volume	23
Issue number	4
DOIs	https://doi.org/10.1021/la062278w
Publication status	Published - 13 Feb 2007
Externally published	Yes

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title = "Detection of novel gaseous states at the highly oriented pyrolytic graphite-water interface",

abstract = "We report a novel form of the gaseous state at the interface of water and highly oriented pyrolytic graphite (HOPG) that is induced by local supersaturation of gas. Such local supersaturation of gas next to the HOPG substrate can be achieved by (1) displacing an organic liquid with a gentle flow of water, (2) displacing cold water (∼0 °C) with a gentle flow of warm water (∼40 °C), or (3) preheating the HOPG substrate to ∼80 °C before exposing it to water at room temperature. In addition to the spherical-cap-shaped nanobubbles reported by many researchers, flat (quasitwo-dimensional, pancake-like) gas layers and nanobubble-flat gas layer composites (spherical-cap-shaped nanobubbles sitting on top of the quasi-two-dimensional gas layers) were detected. These entities disappeared after the system was subjected to a moderate level of degassing (∼0.1 atm for 1.5 h), and they did not form when the liquids involved in the aforementioned displacing procedure (to induce local supersaturation of gas) had been predegassed (to ∼0.1 atm). The stability and some physical properties of these newly found gaseous states are examined. {\textcopyright} 2007 American Chemical Society.",

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AU - Zhang, Xue Hua

AU - Zhang, Xiaodong

AU - Sun, Jielin

AU - Zhang, Zhixiang

AU - Li, Gang

AU - Fang, Haiping

AU - Xiao, Xudong

AU - Zeng, Xiaocheng

AU - Hu, Jun

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

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N2 - We report a novel form of the gaseous state at the interface of water and highly oriented pyrolytic graphite (HOPG) that is induced by local supersaturation of gas. Such local supersaturation of gas next to the HOPG substrate can be achieved by (1) displacing an organic liquid with a gentle flow of water, (2) displacing cold water (∼0 °C) with a gentle flow of warm water (∼40 °C), or (3) preheating the HOPG substrate to ∼80 °C before exposing it to water at room temperature. In addition to the spherical-cap-shaped nanobubbles reported by many researchers, flat (quasitwo-dimensional, pancake-like) gas layers and nanobubble-flat gas layer composites (spherical-cap-shaped nanobubbles sitting on top of the quasi-two-dimensional gas layers) were detected. These entities disappeared after the system was subjected to a moderate level of degassing (∼0.1 atm for 1.5 h), and they did not form when the liquids involved in the aforementioned displacing procedure (to induce local supersaturation of gas) had been predegassed (to ∼0.1 atm). The stability and some physical properties of these newly found gaseous states are examined. © 2007 American Chemical Society.

AB - We report a novel form of the gaseous state at the interface of water and highly oriented pyrolytic graphite (HOPG) that is induced by local supersaturation of gas. Such local supersaturation of gas next to the HOPG substrate can be achieved by (1) displacing an organic liquid with a gentle flow of water, (2) displacing cold water (∼0 °C) with a gentle flow of warm water (∼40 °C), or (3) preheating the HOPG substrate to ∼80 °C before exposing it to water at room temperature. In addition to the spherical-cap-shaped nanobubbles reported by many researchers, flat (quasitwo-dimensional, pancake-like) gas layers and nanobubble-flat gas layer composites (spherical-cap-shaped nanobubbles sitting on top of the quasi-two-dimensional gas layers) were detected. These entities disappeared after the system was subjected to a moderate level of degassing (∼0.1 atm for 1.5 h), and they did not form when the liquids involved in the aforementioned displacing procedure (to induce local supersaturation of gas) had been predegassed (to ∼0.1 atm). The stability and some physical properties of these newly found gaseous states are examined. © 2007 American Chemical Society.

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Detection of novel gaseous states at the highly oriented pyrolytic graphite-water interface

Abstract

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