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Surface-Charged Zirconia Nanoparticles Prepared by Organophosphorus Surface Functionalization with Ammonium or Sulfonate Groups

Heinrich, Charlotte and Niedner, Lucas and Oberhausen, Bastian and Kickelbick, Guido (2019) Surface-Charged Zirconia Nanoparticles Prepared by Organophosphorus Surface Functionalization with Ammonium or Sulfonate Groups. Langmuir. American Chemical society (ACS). DOI: 10.1021/acs.langmuir.9b01093 ISSN 0743-7463

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Abstract

Organophosphorus coupling agents bearing permanently charged functional groups (either cationic quaternary ammonium or anionic sulfonates) were synthesized and used for the modification of zirconia nanoparticles with a diameter <10 nm. Surface functionalization was confirmed by FTIR and solid-state NMR spectroscopy. Surface coverages up to 2.3−2.4 molecules/nm2 were achieved for modification with these charged coupling agents. The pH-dependent charge measurements of homogeneously modified particles showed stable surface charges over a wide range of pH for both ammonium- and sulfonate-functionalized particles. Surface charge measurements of particles co-functionalized with charged coupling molecules and uncharged methyl phosphonic acid revealed a decreasing charge density with increasing amount of uncharged coupling agent. Thus, an adjustment of charges by co-functionalization was obtained on the particle surface. The thus-formed surface-charged colloids were used in a second step for electrostatic-driven Aggregation phenomena necessary for layer-by-layer processes. Sulfonate-modified negatively charged SiO2 submicrometer particles of 506 nm in diameter were decorated with ammonium-modified ZrO2 nanoparticles. In addition, a layer-by-layer deposition of alternating charge-modified TiO2 nanoparticles was proven by optical spectroscopy. Due to the broad applicability of organophosphorus coupling agents for surface modification, particularly for transition-metal oxides, the shown route represents a general method for the creation of almost pH-independent charges on the surface of nanoparticles.

Item URL in elib:https://elib.dlr.de/129101/
Document Type:Article
Title:Surface-Charged Zirconia Nanoparticles Prepared by Organophosphorus Surface Functionalization with Ammonium or Sulfonate Groups
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Heinrich, CharlotteCharlotte.Heinrich (at) dlr.dehttps://orcid.org/0000-0002-8970-9598
Niedner, LucasUniversität des SaarlandesUNSPECIFIED
Oberhausen, BastianUniversität des Saarlandeshttps://orcid.org/0000-0002-4967-8897
Kickelbick, GuidoUniversität des Saarlandeshttps://orcid.org/0000-0001-6813-9269
Date:August 2019
Journal or Publication Title:Langmuir
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1021/acs.langmuir.9b01093
Publisher:American Chemical society (ACS)
ISSN:0743-7463
Status:Published
Keywords:surface-charged functionalization zirconia nanoparticles organophosphorous coupling agents Layer-by-layer process
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:other
DLR - Research area:Transport
DLR - Program:V - no assignment
DLR - Research theme (Project):V - no assignment
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Heinrich, Dr. Charlotte
Deposited On:06 Nov 2019 16:00
Last Modified:06 Nov 2019 16:00

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