Abstract
In this study, three-dimensional network architectures are constructed using nano-sized graphene oxide (nGO) as the building block. The cross-linking reaction of nGO is conducted in sub-micrometre water droplets in an emulsion system to control the size of the networks by restricting the reaction space. Two types of three-dimensional GO networks with different cross-linking lengths were constructed, and their methyl orange adsorption and release behaviours were investigated under external stimuli, such as thermal treatment, ultrasonic wave treatment and near-infrared light irradiation.
Highlights
The development of new and effective drug delivery systems (DDSs) for therapeutic management is one of the most important challenges of modern medicine
The presence of oxygen groups such as hydroxyl, epoxide, carbonyl and carboxyl groups was confirmed by FTIR and X-ray photoelectron spectroscopy (XPS)
The C/O ratio from CHN elemental analysis was estimated to be 0.87, which indicates that nano-sized graphene oxide (nGO) was sufficiently oxidized
Summary
The development of new and effective drug delivery systems (DDSs) for therapeutic management is one of the most important challenges of modern medicine. Graphene oxide (GO), generally produced by the chemical exfoliation of oxidized 2 graphite, possesses abundant oxygen functional groups, such as hydroxyl and epoxide groups on its basal plane, and carboxyl groups at its edges, which promote high dispersibility in pure water and provide reactive sites for further surface chemical functionalization. These excellent properties of aqueous processability, amphiphilicity and surface functionalizability make GO excellent for use in DDSs [10,11,12,13,14,15,16]. The methyl orange adsorption and release behaviours on the novel nano-sized three-dimensional GO networks with different cross-link lengths were investigated under external stimuli, such as thermal treatment, ultrasonic wave treatment and near-infrared light irradiation
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