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Title: Subnanometer Substructures in Nanoassemblies Formed from Clusters under a Reactive Atmosphere Revealed Using Machine Learning

Abstract

Size-selected clusters, soft-landed on an oxide substrate, is a promising and highly tunable material for heterogeneous catalysis. Agglomeration of the deposited clusters, however, leads to changes in the particle properties and structure. The latter for such cluster assemblies can also be different from that in self standing nanoparticles of similar sizes. To monitor the formation of such complex materials, in situ studies at different length scales are required. Toward that goal, we combined small-angle X-ray scattering (SAXS), X-ray absorption near-edge structure (XANES) spectroscopy, ab initio simulations, and machine learning (artificial neural network) techniques. We detected significant differences between the sizes of particle agglomerates, as probed by SAXS, and the sizes of locally ordered regions, as seen by XANES. We interpret these differences as an evidence for the fractal, grape-cluster-like structure of the agglomerates; thus, XANES and SAXS provide highly complementary structural information. This finding can have a profound effect on our understanding of particle sintering and assembly processes and of structure properties relationship in ultradispersed metal catalysts in reaction conditions.

Authors:
 [1];  [2];  [2];  [3];  [2]; ORCiD logo [4]; ORCiD logo [5]
  1. Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Chicago, IL (United States). Inst. for Molecular Engineering
  5. Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering, and Dept. of Chemistry
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1480971
Alternate Identifier(s):
OSTI ID: 1477464
Report Number(s):
BNL-209339-2018-JAAM
Journal ID: ISSN 1932-7447
Grant/Contract Number:  
SC0012704; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 122; Journal Issue: 37; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY

Citation Formats

Timoshenko, Janis, Halder, Avik, Yang, Bing, Seifert, Soenke, Pellin, Michael J., Vajda, Stefan, and Frenkel, Anatoly I. Subnanometer Substructures in Nanoassemblies Formed from Clusters under a Reactive Atmosphere Revealed Using Machine Learning. United States: N. p., 2018. Web. doi:10.1021/acs.jpcc.8b07952.
Timoshenko, Janis, Halder, Avik, Yang, Bing, Seifert, Soenke, Pellin, Michael J., Vajda, Stefan, & Frenkel, Anatoly I. Subnanometer Substructures in Nanoassemblies Formed from Clusters under a Reactive Atmosphere Revealed Using Machine Learning. United States. https://doi.org/10.1021/acs.jpcc.8b07952
Timoshenko, Janis, Halder, Avik, Yang, Bing, Seifert, Soenke, Pellin, Michael J., Vajda, Stefan, and Frenkel, Anatoly I. Sun . "Subnanometer Substructures in Nanoassemblies Formed from Clusters under a Reactive Atmosphere Revealed Using Machine Learning". United States. https://doi.org/10.1021/acs.jpcc.8b07952. https://www.osti.gov/servlets/purl/1480971.
@article{osti_1480971,
title = {Subnanometer Substructures in Nanoassemblies Formed from Clusters under a Reactive Atmosphere Revealed Using Machine Learning},
author = {Timoshenko, Janis and Halder, Avik and Yang, Bing and Seifert, Soenke and Pellin, Michael J. and Vajda, Stefan and Frenkel, Anatoly I.},
abstractNote = {Size-selected clusters, soft-landed on an oxide substrate, is a promising and highly tunable material for heterogeneous catalysis. Agglomeration of the deposited clusters, however, leads to changes in the particle properties and structure. The latter for such cluster assemblies can also be different from that in self standing nanoparticles of similar sizes. To monitor the formation of such complex materials, in situ studies at different length scales are required. Toward that goal, we combined small-angle X-ray scattering (SAXS), X-ray absorption near-edge structure (XANES) spectroscopy, ab initio simulations, and machine learning (artificial neural network) techniques. We detected significant differences between the sizes of particle agglomerates, as probed by SAXS, and the sizes of locally ordered regions, as seen by XANES. We interpret these differences as an evidence for the fractal, grape-cluster-like structure of the agglomerates; thus, XANES and SAXS provide highly complementary structural information. This finding can have a profound effect on our understanding of particle sintering and assembly processes and of structure properties relationship in ultradispersed metal catalysts in reaction conditions.},
doi = {10.1021/acs.jpcc.8b07952},
journal = {Journal of Physical Chemistry. C},
number = 37,
volume = 122,
place = {United States},
year = {Sun Aug 26 00:00:00 EDT 2018},
month = {Sun Aug 26 00:00:00 EDT 2018}
}

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