Unmodified Clay Nanosheets at the Air-Water Interface
POSTER
Abstract
Clay nanolayers are 2D soft materials, such as graphene oxide layers. Clay nanolayers are of great general interest, in particular, because of their use as Pickering emulsion stabilizers and their ability to provide colloidosome capsules. Many reports show that clays could only adhere at oil-water or air-saline-water interfaces in the aggregated state. However, here we demonstrated that unmodified clay nanolayers can be located at air-deionized-water interfaces. In the present work, we use a clay nanolayer made by a synthetic Fluorohectorite with a very high aspect ratio, superior quality in homogeneity and charge distribution. We studied clay nanosheet organization at the air-water interface by combining different experimental methods: Langmuir film studies show insignificant surface tension when the clay particles are at the surface, whereas Grazing Incidence X-ray Off Specular Scattering (GIXOS) confirmed the presence of unmodified and functionalized clay nanosheets at the air-water interface, and Brewster Angle Microscopy (BAM) demonstrated a dynamic equilibrium between unmodified clay nanolayers on the air-liquid interface and the subphase.
*NTNU Ph.D. grant project number 81771176 , NTNU Nanolab, the Research Council of Norway is acknowledged for the support to the Norwegian Micro- and Nano-Fabrication Facility, project number 221860/F60., Research Council of Norway project number 280643 (Petromaks2 Program), Research Council of Norway project number 250619 (Nano2021 Program)Research Council of Norway project number 250728 (Fripro Program). LNLS is acknowledged for providing beamtime at the XRD2 beamline under proposals numbers 20170216, 20180114, and 20190060, Research Council of Brazil (CNPq) project number 432279/2016-4., LNLS project number 20180114, Centro de Investigaciones en Química Biologica de Cordoba. R.G.O. and Microscopy National System, Ministry of Science and Technology of Argentina, German Science Foundation (DFG) within the collaborative research project SFB 840 (B3).
Publication:Unmodified Clay Nanosheets at the Air–Water Interface, Paulo H. Michels-Brito, Antonio Malfatti-Gasperini, Lina Mayr, Ximena Puentes-Martinez, Rômulo P. Tenório, Daniel R. Wagner, Kenneth D. Knudsen, Koiti Araki, Rafael G. Oliveira, Josef Breu, Leide P. Cavalcanti, Jon Otto Fossum, Langmuir 37, 160–170 (2021)
Presenters
Paulo Henrique O Michels Brito
Norwegian University of Science and Technology - NTNU
Department of Physics, Norwegian University of Science and Technology – NTNU, Trondheim, Norway
Authors
Jon Otto Fossum
Norwegian Univ Tech (NTNU)
Paulo Henrique O Michels Brito
Norwegian University of Science and Technology - NTNU
Department of Physics, Norwegian University of Science and Technology – NTNU, Trondheim, Norway
Antonio Malfati-Gasperini
Brazilian Synchrotron Light Laboratory – LNLS, Brazilian Center for Research in Energy and Materials – CNPEM, Campinas, Brazil
Lina Mayr
University of Bayreuth Germany
Ximena Puentes-Martinez
University of Boyacá, Boyacá, Colombia
Rômulo P Tenório
Northeast Regional Center of Nuclear Sciences, Recife, Brazil
Daniel R Wagner
University of Bayreuth Germany
Kenneth D Knudsen
Institute for Energy Technology – IFE, Kjeller, Norway
Institute for Energy Technology, Kjeller Norway
Koiti Araki
University of Sao Paulo – USP, Sao Paulo, Brazil
University of Sao Paulo Brazil
Rafael G Oliveira
Universidad Nacional de Córdoba, Argentina
Josef Breu
University of Bayreuth Germany
Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätstr. 30, 95440 Bayreuth, Germany
