Colloidal stability of graphene oxide nanosheets in association with triblock copolymers: A neutron scattering analysis.

Autor: Patil R; Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India., Marathe D; Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India., Roy SP; Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India., Ray D; Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India., Aswal VK; Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India., Jha PK; Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390002, India., Bahadur P; Department of Chemistry, Veer Narmad South Gujarat University, Surat 395007, India., Tiwari S; Uka Tarsadia University, Maliba Pharmacy College, Gopal-Vidyanagar Campus, Surat 394350, India. Electronic address: tiwarisanju@gmail.com.
Jazyk: angličtina
Zdroj: Materials science & engineering. C, Materials for biological applications [Mater Sci Eng C Mater Biol Appl] 2020 Apr; Vol. 109, pp. 110559. Date of Electronic Publication: 2019 Dec 16.
DOI: 10.1016/j.msec.2019.110559
Abstrakt: This study investigates stabilization of graphene oxide (GO) nanosheets in polyethylene oxide-polypropylene oxide (PEO-PPO) block copolymers (P103, P123 and F127). Changes in micellization of copolymers upon GO addition were monitored using dynamic light (DLS) and small angle neutron scattering (SANS). Structural developments at sheet surface were studied with two possibilities; (i) adsorption of PPO block over hydrophobic basal plane allowing the engagement of hydrophilic PEO with aqueous bulk, and (ii) adsorption of micelles mediated via carboxylated groups. Insignificant changes in micellar parameters for P123 and P127 were indicative of their inferior interaction with GO. On the other hand, P103 micelles exhibited high affinity for sheets, noticeable as emergence of mass fractals and more than two-fold enhancement in micelle number density. The latter allowed coverage of entire surface with P103 micelles. Existence of mass fractals was verified by extracting the form and structure factors from the fitted SANS data. Spectroscopic and thermogravimetric analyses illustrated non-covalent adsorption of copolymer aggregates. It was interesting to note that the dispersion remained stable against protein and electrolyte addition. A comprehensive understanding on colloidal stability can be valuable for drug delivery applications of GO sheets.
Competing Interests: Declaration of competing interest Authors declare no conflict of interest.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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