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Title: Structural Characterization of Aluminum (Oxy)hydroxide Films at the Muscovite (001)–Water Interface

Abstract

The formation of Al (oxy)hydroxide on the basal surface of muscovite mica was investigated to understand how the structure of the substrate controls the nucleation and growth of secondary phases. Atomic force microscopy images showed that solid phases nucleated on the surface initially as two-dimensional islands that were <= 10 angstrom in height and <= 200 angstrom in diameter after 16-50 h of reaction in a 100 mu M AlCl3 solution at pH 4.2 at room temperature. High-resolution X-ray reflectivity data indicated that these islands were gibbsite layers whose basic unit is composed of a plane of Al ions octahedrally coordinated to oxygen or hydroxyl groups. The formation of gibbsite layers is likely favored because of the structural similarity between its basal plane and the underlying mica surface. After 700-2000 h of reaction, a thicker and continuous film had formed on top of the initial gibbsite layers. X-ray diffraction data showed that this film was composed of diaspore that grew predominantly with its [040] and [140] crystallographic directions oriented along the muscovite [001] direction. These results show the structural characteristics of the muscovite (001) and Al (oxy)hydroxide film interface where presumed epitaxy had facilitated nucleation of metastable gibbsite layers whichmore » acted as a structural anchor for the subsequent growth of thermodynamically stable diaspore grown from a mildly acidic and Al-rich solution.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1392030
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 32; Journal Issue: 2; Journal ID: ISSN 0743-7463
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
diaspore; gibbsite; interface; muscovite; nucleation

Citation Formats

Lee, Sang Soo, Schmidt, Moritz, Fister, Timothy T., Nagy, Kathryn L., Sturchio, Neil C., and Fenter, Paul. Structural Characterization of Aluminum (Oxy)hydroxide Films at the Muscovite (001)–Water Interface. United States: N. p., 2016. Web. doi:10.1021/acs.langmuir.5b03346.
Lee, Sang Soo, Schmidt, Moritz, Fister, Timothy T., Nagy, Kathryn L., Sturchio, Neil C., & Fenter, Paul. Structural Characterization of Aluminum (Oxy)hydroxide Films at the Muscovite (001)–Water Interface. United States. doi:10.1021/acs.langmuir.5b03346.
Lee, Sang Soo, Schmidt, Moritz, Fister, Timothy T., Nagy, Kathryn L., Sturchio, Neil C., and Fenter, Paul. Tue . "Structural Characterization of Aluminum (Oxy)hydroxide Films at the Muscovite (001)–Water Interface". United States. doi:10.1021/acs.langmuir.5b03346.
@article{osti_1392030,
title = {Structural Characterization of Aluminum (Oxy)hydroxide Films at the Muscovite (001)–Water Interface},
author = {Lee, Sang Soo and Schmidt, Moritz and Fister, Timothy T. and Nagy, Kathryn L. and Sturchio, Neil C. and Fenter, Paul},
abstractNote = {The formation of Al (oxy)hydroxide on the basal surface of muscovite mica was investigated to understand how the structure of the substrate controls the nucleation and growth of secondary phases. Atomic force microscopy images showed that solid phases nucleated on the surface initially as two-dimensional islands that were <= 10 angstrom in height and <= 200 angstrom in diameter after 16-50 h of reaction in a 100 mu M AlCl3 solution at pH 4.2 at room temperature. High-resolution X-ray reflectivity data indicated that these islands were gibbsite layers whose basic unit is composed of a plane of Al ions octahedrally coordinated to oxygen or hydroxyl groups. The formation of gibbsite layers is likely favored because of the structural similarity between its basal plane and the underlying mica surface. After 700-2000 h of reaction, a thicker and continuous film had formed on top of the initial gibbsite layers. X-ray diffraction data showed that this film was composed of diaspore that grew predominantly with its [040] and [140] crystallographic directions oriented along the muscovite [001] direction. These results show the structural characteristics of the muscovite (001) and Al (oxy)hydroxide film interface where presumed epitaxy had facilitated nucleation of metastable gibbsite layers which acted as a structural anchor for the subsequent growth of thermodynamically stable diaspore grown from a mildly acidic and Al-rich solution.},
doi = {10.1021/acs.langmuir.5b03346},
journal = {Langmuir},
issn = {0743-7463},
number = 2,
volume = 32,
place = {United States},
year = {2016},
month = {1}
}