Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces
Streaming current measurements were used to study the interaction of polyoxometalates (POMs) and nanoparticles (NPs) with flat surfaces as an alternative, innovative approach to infer POM and NP properties of potential sparse material in terms of charge and magnitude. With respect to POMs, the appro...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Colloids and Interfaces |
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| Online Access: | https://www.mdpi.com/2504-5377/4/3/39 |
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| author | Johannes Lützenkirchen Gopala Krishna Darbha Venkata Sai Kiran Chakravadhanula Engelbert Redel Atiđa Selmani Lionel Vayssières |
| author_facet | Johannes Lützenkirchen Gopala Krishna Darbha Venkata Sai Kiran Chakravadhanula Engelbert Redel Atiđa Selmani Lionel Vayssières |
| author_sort | Johannes Lützenkirchen |
| collection | DOAJ |
| description | Streaming current measurements were used to study the interaction of polyoxometalates (POMs) and nanoparticles (NPs) with flat surfaces as an alternative, innovative approach to infer POM and NP properties of potential sparse material in terms of charge and magnitude. With respect to POMs, the approach was able to reveal subtle details of charging properties of +7 vs. +8 charge at very low POM concentrations. For NPs, the sign of charge and even the zeta-potential curve was retrieved. Concerning NPs, mutual interaction between TiO<sub>2</sub> and SiO<sub>2</sub> surfaces was studied in some detail via macroscopic measurements. Post-mortem analysis of samples from electrokinetic studies and separate investigations via AFM and HRTEM verified the interactions between TiO<sub>2</sub> NPs and SiO<sub>2</sub> collector surfaces. The interactions in the SiO<sub>2</sub>/TiO<sub>2</sub> system depend to some extent on NP morphology, but in all our systems, irreversible interactions were observed, which would make the studied types of NPs immobile in natural environments. Overall, we conclude that the measurement of streaming currents at flat surfaces is valuable (i) to study NP and POM collector surface interactions and (ii) to simultaneously collect NPs or POM (or other small mobile clusters) for further (structural, morphological or release) investigations. |
| first_indexed | 2024-03-10T16:29:17Z |
| format | Article |
| id | doaj.art-00af1b4ebb4940f88638af61dbe87259 |
| institution | Directory Open Access Journal |
| issn | 2504-5377 |
| language | English |
| last_indexed | 2024-03-10T16:29:17Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Colloids and Interfaces |
| spelling | doaj.art-00af1b4ebb4940f88638af61dbe872592023-11-20T12:58:53ZengMDPI AGColloids and Interfaces2504-53772020-09-01433910.3390/colloids4030039Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat SurfacesJohannes Lützenkirchen0Gopala Krishna Darbha1Venkata Sai Kiran Chakravadhanula2Engelbert Redel3Atiđa Selmani4Lionel Vayssières5Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, GermanyInstitute for Nuclear Waste Disposal, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, GermanyHelmholtz Institute Ulm (HIU), Electrochemical Energy Storage, Helmholtzstr. 11, 89081 Ulm, GermanyInstitute of Functional Surfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, GermanyDivision of Physical Chemistry, Laboratory for Biocolloids and Surface Chemistry, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, CroatiaInternational Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, 28 Xianning west road, Xi‘an 710049, ChinaStreaming current measurements were used to study the interaction of polyoxometalates (POMs) and nanoparticles (NPs) with flat surfaces as an alternative, innovative approach to infer POM and NP properties of potential sparse material in terms of charge and magnitude. With respect to POMs, the approach was able to reveal subtle details of charging properties of +7 vs. +8 charge at very low POM concentrations. For NPs, the sign of charge and even the zeta-potential curve was retrieved. Concerning NPs, mutual interaction between TiO<sub>2</sub> and SiO<sub>2</sub> surfaces was studied in some detail via macroscopic measurements. Post-mortem analysis of samples from electrokinetic studies and separate investigations via AFM and HRTEM verified the interactions between TiO<sub>2</sub> NPs and SiO<sub>2</sub> collector surfaces. The interactions in the SiO<sub>2</sub>/TiO<sub>2</sub> system depend to some extent on NP morphology, but in all our systems, irreversible interactions were observed, which would make the studied types of NPs immobile in natural environments. Overall, we conclude that the measurement of streaming currents at flat surfaces is valuable (i) to study NP and POM collector surface interactions and (ii) to simultaneously collect NPs or POM (or other small mobile clusters) for further (structural, morphological or release) investigations.https://www.mdpi.com/2504-5377/4/3/39polyoxometalatesnanoparticlesDLVOSiO<sub>2</sub>TiO<sub>2</sub> |
| spellingShingle | Johannes Lützenkirchen Gopala Krishna Darbha Venkata Sai Kiran Chakravadhanula Engelbert Redel Atiđa Selmani Lionel Vayssières Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces Colloids and Interfaces polyoxometalates nanoparticles DLVO SiO<sub>2</sub> TiO<sub>2</sub> |
| title | Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces |
| title_full | Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces |
| title_fullStr | Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces |
| title_full_unstemmed | Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces |
| title_short | Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces |
| title_sort | interaction of polyoxometalates and nanoparticles with collector surfaces focus on the use of streaming current measurements at flat surfaces |
| topic | polyoxometalates nanoparticles DLVO SiO<sub>2</sub> TiO<sub>2</sub> |
| url | https://www.mdpi.com/2504-5377/4/3/39 |
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