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/ | |||||||||||||||
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Document Type: | Article | |||||||||||||||
Title: | Surface-Charged Zirconia Nanoparticles Prepared by Organophosphorus Surface Functionalization with Ammonium or Sulfonate Groups | |||||||||||||||
Authors: |
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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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