The nanoscale description of acid penetration to the gold colloids encapsulated in silica sol-gel matrix

Kazushige Yokoyama; Jeffrey R. Swana; Tonya M. Gilbert; Duo D. Chen; Liwen Chen; Paul Kogan

doi:10.1007/s10971-009-1904-7

The nanoscale description of acid penetration to the gold colloids encapsulated in silica sol-gel matrix

Kazushige Yokoyama, Jeffrey R. Swana, Tonya M. Gilbert, Duo D. Chen, Liwen Chen, Paul Kogan

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Various sizes of gold nano colloidal particles ranging from 5 nm to 100 nm of size were encapsulated in a silica based sol-gel, and these surfaces were exposed to a pH 1 acid solution. This enabled us to observe the process of solvent intrusion and interaction with gold colloids by the absorption spectrum as a function of time. The rate was analyzed by a single exponential analytical function, and the maximum rate was found for gold colloid of 15 nm size. The least acid interaction and colour change was observed for the size of 60 nm. It was speculated that the surface of these gold colloids were homogeneously covered by the sodium tetra-borate buffer which insulated silica gel layer, thus avoiding direct contact of the acid with the surface of the gold colloid. This study confirmed that the nano scale dopant size affects the rate of solvent penetration into a sol-gel cavity.

Original language	English
Pages (from-to)	48-57
Number of pages	10
Journal	Journal of Sol-Gel Science and Technology
Volume	50
Issue number	1
DOIs	https://doi.org/10.1007/s10971-009-1904-7
State	Published - Apr 2009

Keywords

Acid diffusion
Gold colloids
Nano size dependence
Silica sol-gel

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10.1007/s10971-009-1904-7

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title = "The nanoscale description of acid penetration to the gold colloids encapsulated in silica sol-gel matrix",

abstract = "Various sizes of gold nano colloidal particles ranging from 5 nm to 100 nm of size were encapsulated in a silica based sol-gel, and these surfaces were exposed to a pH 1 acid solution. This enabled us to observe the process of solvent intrusion and interaction with gold colloids by the absorption spectrum as a function of time. The rate was analyzed by a single exponential analytical function, and the maximum rate was found for gold colloid of 15 nm size. The least acid interaction and colour change was observed for the size of 60 nm. It was speculated that the surface of these gold colloids were homogeneously covered by the sodium tetra-borate buffer which insulated silica gel layer, thus avoiding direct contact of the acid with the surface of the gold colloid. This study confirmed that the nano scale dopant size affects the rate of solvent penetration into a sol-gel cavity.",

keywords = "Acid diffusion, Gold colloids, Nano size dependence, Silica sol-gel",

author = "Kazushige Yokoyama and Swana, {Jeffrey R.} and Gilbert, {Tonya M.} and Chen, {Duo D.} and Liwen Chen and Paul Kogan",

note = "Funding Information: Acknowledgements This work is supported by the National Science Foundation under grant number NSF-NER 0508240. A generous contribution from The SUNY-Geneseo Foundation at an initial stage of this project is greatly acknowledged. Nitrogen porosimetry measurements were kindly supported by Professor Hong Yang of the",

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doi = "10.1007/s10971-009-1904-7",

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AU - Gilbert, Tonya M.

AU - Chen, Duo D.

AU - Chen, Liwen

AU - Kogan, Paul

N1 - Funding Information: Acknowledgements This work is supported by the National Science Foundation under grant number NSF-NER 0508240. A generous contribution from The SUNY-Geneseo Foundation at an initial stage of this project is greatly acknowledged. Nitrogen porosimetry measurements were kindly supported by Professor Hong Yang of the

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N2 - Various sizes of gold nano colloidal particles ranging from 5 nm to 100 nm of size were encapsulated in a silica based sol-gel, and these surfaces were exposed to a pH 1 acid solution. This enabled us to observe the process of solvent intrusion and interaction with gold colloids by the absorption spectrum as a function of time. The rate was analyzed by a single exponential analytical function, and the maximum rate was found for gold colloid of 15 nm size. The least acid interaction and colour change was observed for the size of 60 nm. It was speculated that the surface of these gold colloids were homogeneously covered by the sodium tetra-borate buffer which insulated silica gel layer, thus avoiding direct contact of the acid with the surface of the gold colloid. This study confirmed that the nano scale dopant size affects the rate of solvent penetration into a sol-gel cavity.

AB - Various sizes of gold nano colloidal particles ranging from 5 nm to 100 nm of size were encapsulated in a silica based sol-gel, and these surfaces were exposed to a pH 1 acid solution. This enabled us to observe the process of solvent intrusion and interaction with gold colloids by the absorption spectrum as a function of time. The rate was analyzed by a single exponential analytical function, and the maximum rate was found for gold colloid of 15 nm size. The least acid interaction and colour change was observed for the size of 60 nm. It was speculated that the surface of these gold colloids were homogeneously covered by the sodium tetra-borate buffer which insulated silica gel layer, thus avoiding direct contact of the acid with the surface of the gold colloid. This study confirmed that the nano scale dopant size affects the rate of solvent penetration into a sol-gel cavity.

KW - Acid diffusion

KW - Gold colloids

KW - Nano size dependence

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The nanoscale description of acid penetration to the gold colloids encapsulated in silica sol-gel matrix

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Keywords

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