Long-term antibacterial stable reduced graphene oxide nanocomposites loaded with cuprous oxide nanoparticles

Positively charged polymeric materials have been an alternative to combat bacteria as they exhibit inherently antibacterial potency via bacteria membrane disruption. In this study, we report facile preparation of positively charged core‐crosslinked polymeric micelles with inherent antibacterial properties. Spherical micelles were prepared by self‐assembling of poly(4‐vinylpyridine)‐b‐(oligoethylene glycol methyl ether methacrylate) copolymer in aqueous solution. Herein, quaternization reaction was utilized for the first time to core crosslink the micelles through the pyridine rings utilizing their hydrophobic core and thus resulting positively charged nanostructures. Dynamic light scattering (DLS) results identified that the micelles have an average hydrodynamic diameter of 114 nm with a polydispersity index ranging between 0.105 and 0.114. The electrophoretic light scattering (ELS) measurements demonstrated that the micelles have zeta potential values ranging from +38 to +63 mV. It was evident from both ELS and DLS results that the micelles in solution exhibit long‐term stability as the samples were able to maintain their size and charge even after a year of storage. Further, the micelles exhibited inherently antibacterial activity against Escherichia coli and furthermore, this antibacterial efficacy was sustained over a period of 1 year. These stable core‐crosslinked micelles are proposed to have great potential as antibacterial materials for long‐term applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48393.

Section: Resultsmentioning

confidence: 99%

Core‐crosslinking as a pathway to develop inherently antibacterial polymeric micelles

Kadayifci

Gökkaya

Topuzoğulları

et al. 2019

“…[7] Carbons in the form of powder, particles, nanofibers, and nanotubes have been investigated for EMI shielding applications owing to their good electrical conductivity and corrosion resistance. [9,10] Although having problems of sloughing in carbon, monotonous synthesis procedures and high cost of carbon nanostructures limit their applications in EMI shielding. Intrinsically conducting polymers such as polythiophene (PTH), poly-P-phenylene-benzobisthiazole (PBT), polypyrrole (PPy), and polyaniline (PANI) have been effective shielding materials on account of tunable electrical conductivity, low cost, corrosion resistance, easy processability, and mechanical flexibility.…”

Section: Introductionmentioning

confidence: 99%

Significantly high electromagnetic shielding effectiveness in polypyrrole synthesized by eco‐friendly and cost‐effective technique

Agrawal

Shah

Gupta

et al. 2020

A facile and eco‐friendly synthesis of polypyrrole from monomer pyrrole using nominal amount of ferric chloride hexahydrate (FeCl3.6H2O) oxidant in aqueous solution by chemically oxidative polymerization method has been reported. The use of aqueous solvent and ferric chloride hexahydrate salt in polypyrrole synthesis have an eco‐friendly route favorable for the production of polypyrrole in large quantities. The synthesized polypyrrole samples exhibit good electrical conductivity (2 S/cm) and yield of 80% for reaction time of 8 hr at 5°C. Quality and properties of polypyrrole samples have been thoroughly investigated with varying reaction time and temperature while other synthesis parameters like molar ratio of oxidant to monomer, oxidant concentration, and solvent were kept constant. X‐ray diffraction analysis of polypyrrole with a shorter reaction time shows the presence of iron oxide (Fe2O3) peaks. The complete reaction may not occur at shorter reaction times due to which residual ferric ions converted into Fe2O3. X‐ray photoelectron spectroscopy measurement of polypyrrole also confirms the formation of Fe2O3. Appropriate selection of reaction time and temperature produced pure phase polypyrrole with high yield and good conductivity. Synthesized polypyrrole by our eco‐friendly and cost‐effective technique exhibits prominent electromagnetic shielding effectiveness value of 30 dB in the X‐band (8–12 GHz).

“…Graphene can also be used as a microwave absorbing material in the electronic communication industry . At the same time, the excellent antibacterial and bactericidal properties of reduced graphene oxide (rGO) bearing cuprous oxide have certain applications in the fields of medicine hygiene and food safety . Liu et al .…”

Section: Introductionmentioning

confidence: 99%

Recent developments in graphene‐based polymer composite membranes: Preparation, mass transfer mechanism, and applications

Huang

Wang

et al. 2019

The shortage of water resources is a problem concerned by all countries in the world. In order to solve this problem of human survival, membrane separation technology promotes the development of water treatment field by virtue of its own advantages of high efficiency and low consumption. Membrane separation technology combined with nanomaterials has brought surprises to researchers. Graphene has unique structure and properties, making graphene and its derivatives have very good potential in water treatment and selective separation. Graphene-based materials combined with traditional polymer materials have great potential in the field of membrane separation technology. In this article, we first introduce the preparation methods and transport mechanism of graphenebased membranes, and then summarize the recent applications of graphene oxide/polymer composite membranes in water purification, gas separation, self-cleaning, and oil-water separation. It is expected to become the next generation of functional composite membranes.