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

Langmuir : the ACS Journal of Surfaces and Colloids
Charlotte HeinrichGuido Kickelbick

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 lay...Continue Reading

References

Oct 13, 2006·Nano Letters·Daeyeon LeeRobert E Cohen
Aug 2, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Christopher A Traina, Jeffrey Schwartz
Jun 2, 2009·Journal of Colloid and Interface Science·Duc Quy VoSunwook Kim
Feb 26, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Christoph J LomoschitzGuido Kickelbick
Mar 10, 2012·Journal of Nanoscience and Nanotechnology·Angelika BachingerGuido Kickelbick
Mar 24, 2012·Journal of Colloid and Interface Science·Volodymyr SashukMarcin Fiałkowski
Apr 27, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Benjamin T CheesmanErica J Wanless
Jan 17, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Behnam AkhavanPeter Majewski
Jan 15, 2015·Molecular Pharmaceutics·Suman LabalaVenkata Vamsi Krishna Venuganti
Apr 25, 2015·Science·Joseph J RichardsonFrank Caruso
Jul 29, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Mahdi RoohnikanLinda Reven
Sep 4, 1998·Angewandte Chemie·Edwin DonathHelmuth Möhwald

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Citations

Feb 11, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Siyang He, Guido Kickelbick

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