Journal Article

PUBDB-2022-05102

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Adsorption of Oleic Acid on Magnetite Facets

Creutzburg, M.DESY* ; Konuk, M. ; Tober, S.Extern* ; Chung, S.XFEL.EU*DESY* ; Arndt, B.Extern* ; Noei, H.DESY* ; Meissner, R. (Corresponding author)Extern* ; Stierle, A. (Corresponding author)XFEL.EU*DESY*

2022
Macmillan Publishers Limited, part of Springer Nature [London]

This record in other databases:        

Please use a persistent id in citations: doi:10.1038/s42004-022-00741-0  doi:10.3204/PUBDB-2022-05102

Abstract: The microscopic understanding of the atomic structure and interaction at carboxylic acid/oxide interfaces is an important step towards tailoring the mechanical properties of nanocomposite materials assembled from metal oxide nanoparticles functionalized by organic molecules. We have studied the adsorption of oleic acid (C$_{17}$H$_{33}$COOH) on the most prominent magnetite (001) and (111) crystal facets at room temperature using low energy electron diffraction, surface X-ray diffraction and infrared vibrational spectroscopy complemented with molecular dynamics simulations used to infer specific hydrogen bonding motifs between oleic acid and oleate. Our experimental and theoretical results give evidence that oleic acid adsorbs dissociatively on both facets at lower coverages. At higher coverages, the more pronounced molecular adsorption causes hydrogen bond formation between the carboxylic groups, leading to a more upright orientation of the molecules on the (111) facet in conjunction with the formation of a denser layer, as compared to the (001) facet. This is evidenced by the C=O double bond infrared line shape, in depth molecular dynamics bond angle orientation and hydrogen bond analysis, as well as X-ray reflectivity layer electron density profile determination. Such a higher density can explain the higher mechanical strength of nanocomposite materials based on magnetite nanoparticles with larger (111) facets.

---

Contributing Institute(s):

1. Nanolab (FS-NL)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. SFB 986 A07 - Adsorption organischer Säuren auf Oxidoberflächen und Nanostrukturen (A07) (318017425) (318017425)
3. SFB 986 A08 - Molekulardynamische Simulation der Selbstassemblierung von organisch funktionalisierten keramischen Nanopartikeln (A08) (407591998) (407591998)

Experiment(s):

1. DESY NanoLab: Sample Preparation
2. DESY NanoLab: Surface Spectroscopy
3. DESY NanoLab: Microscopy

Appears in the scientific report 2022

---

Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; Fees ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---