Atomic structure and surface defects at mineral-water interfaces probed by in situ atomic force microscopy

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Abstract

Atomic scale details of surface structure play a crucial role for solid–liquid interfaces. While macroscopic characterization techniques provide averaged information about bulk and interfaces, high resolution real space imaging reveals unique insights into the role of defects that are believed to dominate many aspects of surface chemistry and physics. Here, we use high resolution dynamic Atomic Force Microscopy (AFM) to visualize and characterize in ambient water the morphology and atomic scale structure of a variety of nanoparticles of common clay minerals adsorbed to flat solid surfaces. Atomically resolved images of the (001) basal planes are obtained on all materials investigated, namely gibbsite, kaolinite, illite, and Na-montmorillonite of both natural and synthetic origin. Next to regions of perfect crystallinity, we routinely observe extended regions of various types of defects on the surfaces, including vacancies of one or few atoms, vacancy islands, atomic steps, apparently disordered regions, as well as strongly adsorbed seemingly organic and inorganic species. While their exact nature is frequently difficult to identify, our observations clearly highlight the ubiquity of such defects and their relevance for the overall physical and chemical properties of clay nanoparticle–water interfaces.
Original languageEnglish
Pages (from-to)8220-8227
JournalNanoscale
Volume8
DOIs
Publication statusPublished - 2016

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Mineral Waters
Surface defects
Atomic force microscopy
Minerals
Clay minerals
Defects
Vacancies
Bentonite
Kaolin
Water
Kaolinite
Surface chemistry
Surface structure
Chemical properties
Clay
Physics
Physical properties
Nanoparticles
Imaging techniques
Atoms

Keywords

  • METIS-319554
  • IR-102523

Cite this

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title = "Atomic structure and surface defects at mineral-water interfaces probed by in situ atomic force microscopy",
abstract = "Atomic scale details of surface structure play a crucial role for solid–liquid interfaces. While macroscopic characterization techniques provide averaged information about bulk and interfaces, high resolution real space imaging reveals unique insights into the role of defects that are believed to dominate many aspects of surface chemistry and physics. Here, we use high resolution dynamic Atomic Force Microscopy (AFM) to visualize and characterize in ambient water the morphology and atomic scale structure of a variety of nanoparticles of common clay minerals adsorbed to flat solid surfaces. Atomically resolved images of the (001) basal planes are obtained on all materials investigated, namely gibbsite, kaolinite, illite, and Na-montmorillonite of both natural and synthetic origin. Next to regions of perfect crystallinity, we routinely observe extended regions of various types of defects on the surfaces, including vacancies of one or few atoms, vacancy islands, atomic steps, apparently disordered regions, as well as strongly adsorbed seemingly organic and inorganic species. While their exact nature is frequently difficult to identify, our observations clearly highlight the ubiquity of such defects and their relevance for the overall physical and chemical properties of clay nanoparticle–water interfaces.",
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author = "Igor S{\^i}retanu and {van den Ende}, {Henricus T.M.} and Mugele, {Friedrich Gunther}",
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T1 - Atomic structure and surface defects at mineral-water interfaces probed by in situ atomic force microscopy

AU - Sîretanu, Igor

AU - van den Ende, Henricus T.M.

AU - Mugele, Friedrich Gunther

PY - 2016

Y1 - 2016

N2 - Atomic scale details of surface structure play a crucial role for solid–liquid interfaces. While macroscopic characterization techniques provide averaged information about bulk and interfaces, high resolution real space imaging reveals unique insights into the role of defects that are believed to dominate many aspects of surface chemistry and physics. Here, we use high resolution dynamic Atomic Force Microscopy (AFM) to visualize and characterize in ambient water the morphology and atomic scale structure of a variety of nanoparticles of common clay minerals adsorbed to flat solid surfaces. Atomically resolved images of the (001) basal planes are obtained on all materials investigated, namely gibbsite, kaolinite, illite, and Na-montmorillonite of both natural and synthetic origin. Next to regions of perfect crystallinity, we routinely observe extended regions of various types of defects on the surfaces, including vacancies of one or few atoms, vacancy islands, atomic steps, apparently disordered regions, as well as strongly adsorbed seemingly organic and inorganic species. While their exact nature is frequently difficult to identify, our observations clearly highlight the ubiquity of such defects and their relevance for the overall physical and chemical properties of clay nanoparticle–water interfaces.

AB - Atomic scale details of surface structure play a crucial role for solid–liquid interfaces. While macroscopic characterization techniques provide averaged information about bulk and interfaces, high resolution real space imaging reveals unique insights into the role of defects that are believed to dominate many aspects of surface chemistry and physics. Here, we use high resolution dynamic Atomic Force Microscopy (AFM) to visualize and characterize in ambient water the morphology and atomic scale structure of a variety of nanoparticles of common clay minerals adsorbed to flat solid surfaces. Atomically resolved images of the (001) basal planes are obtained on all materials investigated, namely gibbsite, kaolinite, illite, and Na-montmorillonite of both natural and synthetic origin. Next to regions of perfect crystallinity, we routinely observe extended regions of various types of defects on the surfaces, including vacancies of one or few atoms, vacancy islands, atomic steps, apparently disordered regions, as well as strongly adsorbed seemingly organic and inorganic species. While their exact nature is frequently difficult to identify, our observations clearly highlight the ubiquity of such defects and their relevance for the overall physical and chemical properties of clay nanoparticle–water interfaces.

KW - METIS-319554

KW - IR-102523

U2 - 10.1039/C6NR01403H

DO - 10.1039/C6NR01403H

M3 - Article

VL - 8

SP - 8220

EP - 8227

JO - Nanoscale

JF - Nanoscale

SN - 2040-3364

ER -