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| Journal Article | FZJ-2021-01770 |
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2021
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: http://hdl.handle.net/2128/27807 doi:10.1016/j.molliq.2021.116151
Abstract: Graphene oxide (GO) is a promising material for the construction of biological functional surfaces and corresponding biomedical applications. The physical properties of sheets of GO are determined by its conductivity, flexibility (being just a few atomic carbon layers thick), and hydrophilicity/hydrophobicity. In order to exploiting multitask surfaces, however, controlling reliable tunability of the complex formation with other macromolecules in aqueous environments is highly non-trivial due to the hydrophobic nature of GO. Thus, one effective way of complicated physical process of dealing with aqueous systems of GO is to perform the complex formation under in-situ external fields. In this paper, we report the response of GO-sheets, complexed with spherical colloidal polystyrene particles, nafion, and long and thin DNA-viruses (fd), in alternating electric fields, probed by means of novel experimental methods of image-time correlation spectroscopy and small-angle dynamic light scattering. Here, the frequency-responsive reorientations of a GO-sheet are interpreted by random orientations of particles. As results, we have found that GO carries overall local reorientations with feedback oscillations, as well in the GO-complexes (of a colloidal sphere polymerized polystyrene (PPs) and nafion solution). However, such oscillations are absent, as overdamped Brownian motion, in the mixture of DNA-virus suspension (with GO-PPs). This indicates that Brownian fluctuations of GO can be effectively stabilized, and cooperated in the membrane-based, isotropic rod-mesh network of DNA-virus (fd) suspension. We hope then the results are useful to foster better designs of processing GO-sheets in the controls of accessible biological and biomedical applications.
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