Research and Application Progress Based on the Interfacial Properties of Graphene Oxide

Abstract

Graphene oxide (GO), a novel carbon‐based nanomaterial, has been significantly developed and investigated during the past decade in the fields of material science and chemistry. GO is essentially one‐atom thick, but the lateral dimension can reach to dozens of microns, resulting in a unique 2D layered structure. This allows for oxygen‐containing functional groups to be grafted on the sheets, which give GO a unique amphiphilicity and enables it to self‐assemble at two‐phase interfaces. This characteristic provides significant potential for the development of functional interfacial materials with promising performances, including the synthesis of large area interfacial membranes, GO‐based coating with self‐healing abilities, and functional GO‐based emulsions. In this review, the interfacial assembly behaviors of GO and functionalized‐GO at the air–liquid, liquid–liquid, and liquid–solid interfaces are discussed to further understand the properties and applications of GO. The synthesis of different composites using these interfacial properties is also discussed. The application progress of GO composite materials that are prepared based on their interfacial properties is also illustrated, and possible challenges are proposed.

Self‐Assembly of Graphene Oxide/Nanodiamond Microspheres with High Adsorption for Pb(II) Ions

“…As presented in Figure 5d, the bands at 3426, 1722, 1323 and 1623 cm −1 correspond to the vibration of −OH, C=O, C−O−C and C=C groups, respectively [15a,16] . The peaks related to C−N (1302 cm −1 ) and monosubstituted benzene (750 and 690 cm −1 ) demonstrate well that GO reacts with aniline through π‐π interactions, acid‐base reaction and the ring‐opening reaction [11–12,17] . The above results prove the existence of several kinds of oxygen functions groups such as carboxyl, hydroxyl and carbonyl on GO/15 %ND, which will be quantificationally tested as followed…”

“…[15a,16] The peaks related to CÀ N (1302 cm À 1 ) and monosubstituted benzene (750 and 690 cm À 1 ) demonstrate well that GO reacts with aniline through π-π interactions, acid-base reaction and the ring-opening reaction. [11][12]17] The above results prove the existence of several kinds of oxygen functions groups such as carboxyl, hydroxyl and carbonyl on GO/15 %ND, which will be quantificationally tested as followed FT-IR spectroscopy only demonstrates the presence of the oxygen functional groups on the samples qualitatively. Thus, the Boehm titration was conducted and the result was summarized in Figure 6a and Table 1.…”

“…Firstly, the conjugated region in GO and aromatic ring of aniline leads to the π‐π interaction, thus GO can easily extract from the aqueous solution into aniline phase [11] . Secondly, some reactions occur between GO and aniline such as the acid‐base reaction (carboxyl group and amino group) and ring‐opening reaction (epoxy group and amine) [12] …”

“…[11] Secondly, some reactions occur between GO and aniline such as the acidbase reaction (carboxyl group and amino group) and ringopening reaction (epoxy group and amine). [12] Characterization of GO/15 %ND microspheres GO/15 %ND microspheres with the minimum size are obtained under the ratio of GO/aniline of 130 mg:1 mL at the rotational speed of 2000 r min À 1 . The SEM in Figure 4a shows GO/15 %ND microspheres with the diameter of about 400-600 μm.…”

Water lubrication of graphene oxide-based materials

“…The variety, reaction sites, structure, and amounts of the introductions have a great influence on the tribology properties of composites (Fig. 8) [94][95][96].…”