Nanoscale imaging of molecular adsorption

H. Cai, A. C. Hillier, K. R. Franklin, C. C. Nunn, Michael Ward

Research output: Contribution to journalArticle

Abstract

In situ atomic force microscope observations were made of the adsorption of anions (1- or 2-) of the organic diacid 5-benzoyl-4-hydroxy-2-methoxybenzenesulfonic acid from aqueous solution onto the (0001) surface of hydrotalcite (HT), a layered clay. This adsorption process is believed to mimic the ion-exchange reactions that occur within the layers of HT and other layered clays. Atomic force microscope images of the (0001) surfaces of HT, acquired in aqueous solutions, reveal an ordered structure with respect to magnesium and aluminum atoms. In the presence of the anions, atomic force microscopy indicates pH-dependent adsorption onto the formally cationic HT surface. The anion coverage is governed by electroneutrality and steric interactions between the bulky anions within the adsorbed layer, whereas the orientation of the anions with respect to the HT surface is dictated by coulombic interactions and hydrogen bonding between the anion's sulfonate moiety and clay hydroxyl triads. These observations reveal that the reversible adsorption of molecular species can be examined directly by in situ atomic force microscopy, providing details of surface stoichiometry and adlayer symmetry on the local, molecular level.

Original languageEnglish (US)
Pages (from-to)1551-1555
Number of pages5
JournalScience
Volume266
Issue number5190
StatePublished - 1994

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hydrotalcite
Molecular Imaging
Adsorption
Anions
Atomic Force Microscopy
Ion Exchange
Hydrogen Bonding
Aluminum
Hydroxyl Radical
Magnesium

ASJC Scopus subject areas

  • General

Cite this

Cai, H., Hillier, A. C., Franklin, K. R., Nunn, C. C., & Ward, M. (1994). Nanoscale imaging of molecular adsorption. Science, 266(5190), 1551-1555.

Nanoscale imaging of molecular adsorption. / Cai, H.; Hillier, A. C.; Franklin, K. R.; Nunn, C. C.; Ward, Michael.

In: Science, Vol. 266, No. 5190, 1994, p. 1551-1555.

Research output: Contribution to journalArticle

Cai, H, Hillier, AC, Franklin, KR, Nunn, CC & Ward, M 1994, 'Nanoscale imaging of molecular adsorption', Science, vol. 266, no. 5190, pp. 1551-1555.
Cai H, Hillier AC, Franklin KR, Nunn CC, Ward M. Nanoscale imaging of molecular adsorption. Science. 1994;266(5190):1551-1555.
Cai, H. ; Hillier, A. C. ; Franklin, K. R. ; Nunn, C. C. ; Ward, Michael. / Nanoscale imaging of molecular adsorption. In: Science. 1994 ; Vol. 266, No. 5190. pp. 1551-1555.
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