On the State of Graphene Oxide Nanosheet in a Polyurethane Matrix

Abstract

Thermally stable films were obtained from a water-based polyurethane (PU) dispersion with small (0.1–1.5 wt.%) additions of graphene oxide (GO). The films were studied through elemental analysis, X-ray photoelectron spectroscopy, differential thermogravimetry, and Raman spectroscopy. It was found that the introduction of GO into a PU matrix was accompanied by a partial reduction in graphene oxide nanosheet and an increase in the concentration of defects in GO structure. It has been also established that the [C/N]at ratio in the near-surface layer of PU/GO composite films grows with an increase in the content of graphene oxide in the composite films.

Improving Biocompatibility of Polyurethanes Apply in Medicine Using Oxygen Plasma and Its Negative Effect on Increased Bacterial Adhesion

“…Te narrow scan analysis revealed additional subpeaks and chemical shifts associated with specifc bonding confgurations and oxidation states for each element, i.e., changes in the O 1s peak from 532.0 eV to 533.2 eV. N 1s at a binding energy of 400.4 eV correspond to the isocyanate groups (-N-C(�O)-) in urethane links [17]. Tese fndings summarize the main diferences in the XPS spectra after plasma modifcation of polyurethane, which are a decrease in the intensity of the C 1s peak and a signifcant increase in the O 1s peak.…”

Electric Field Effects on Curved Graphene Quantum Dots

“…There is no doubt that there has been a long-lasting wave of advancements and innovation revolving around graphene, with strange phenomena and potential applications appearing on a yearly basis. Almost every field seems to have an application where the extraordinary properties of graphene (either pristine or oxidised) can shine, from engineering [1][2][3][4] to catalysis [5][6][7][8], medicine [9][10][11][12][13], sensing [14][15][16], optics/electromagnetics [17][18][19][20], hydraulics [21,22], and energy management [23][24][25], to cite a few examples.…”