DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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.

Full text not available from this repository.


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
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Heinrich, CharlotteUNSPECIFIEDhttps://orcid.org/0000-0002-8970-9598UNSPECIFIED
Niedner, LucasUniversität des SaarlandesUNSPECIFIEDUNSPECIFIED
Oberhausen, BastianUniversität des Saarlandeshttps://orcid.org/0000-0002-4967-8897UNSPECIFIED
Kickelbick, GuidoUniversität des Saarlandeshttps://orcid.org/0000-0001-6813-9269UNSPECIFIED
Date:August 2019
Journal or Publication Title:Langmuir
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Chemical society (ACS)
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

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.