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Wang M.,Huaihai Institute of Technology | Wang M.,University of Wollongong | Huang J.,Huaihai Institute of Technology | Tong Z.,Huaihai Institute of Technology | And 3 more authors.
Journal of Alloys and Compounds

Cubic Cu2O nanoparticles have been successfully synthesized on n-propylamine (PA) intercalated graphene oxide (GO) with uniform distribution followed with a subsequent hydrazine hydrate reduction process to generate Cu2O/PA/rGO composite. For comparison, Cu2O conjugated reduced graphene oxide (Cu2O/rGO) composite was also synthesized using the same method. The as-prepared Cu2O/PA/rGO and Cu 2O/rGO nanocomposites are characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) spectroscopy, infrared spectroscopy (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface area analysis, and Electrochemical impedance spectra (EIS) measurements. UV/vis diffuse reflectance spectroscopy was employed to estimate band gap energies of cuprous oxide composites. The results show that the intercalation of PA into the layered GO increases the surface area of the composites and provides an efficient strategy to load Cu2O due to the large and uniform distribution of active sites for anchoring copper ions. The surface area of the Cu2O/PA/rGO (123 m2/g) nanocomposite was found to be almost 2.5 times higher than that of Cu2O/rGO (55.7 m2/g). The as-prepared Cu 2O/PA/rGO show significant improvement on both adsorption capacity and photocatalytic activity towards organic pigment pollution compared with Cu2O/rGO under identical performance conditions. © 2013 Elsevier B.V. All rights reserved. Source

Moulton S.E.,Intelligent Polymer Research Institute | Wallace G.G.,University of Wollongong
Journal of Controlled Release

Drug delivery from 3-dimensional (3D) structures is a rapidly growing area of research. It is essential to achieve structures wherein drug stability is ensured, the drug loading capacity is appropriate and the desired controlled release profile can be attained. Attention must also be paid to the development of appropriate fabrication machinery that allows 3D drug delivery systems (DDS) to be produced in a simple, reliable and reproducible manner. The range of fabrication methods currently being used to form 3D DDSs include electrospinning (solution and melt), wet-spinning and printing (3-dimensional). The use of these techniques enables production of DDSs from the macro-scale down to the nano-scale. This article reviews progress in these fabrication techniques to form DDSs that possess desirable drug delivery kinetics for a wide range of applications. © 2014 Elsevier B.V. Source

Zhao J.,Intelligent Polymer Research Institute | Zhang W.,Intelligent Polymer Research Institute | Zhang W.,University of Sydney | Sherrell P.,Intelligent Polymer Research Institute | And 4 more authors.
ACS Applied Materials and Interfaces

A highly sensitive and selective dopamine sensor was fabricated with the unique 3D carbon nanotube nanoweb (CNT-N) electrode. The as-synthesised CNT-N was modified by oxygen plasma to graft functional groups in order to increase selective electroactive sites at the CNT sidewalls. This electrode was characterized physically and electrochemically using HRSEM, Raman, FT-IR, and cyclic voltammetry (CV). Our investigations indicated that the O 2-plasma treated CNT-N electrode could serve as a highly sensitive biosensor for the selective sensing of dopamine (DA, 1 μM to 20 μM) in the presence of ascorbic acid (AA, 1000 μM). © 2011 American Chemical Society. Source

Wang M.,Intelligent Polymer Research Institute | Wang J.,Institute for Superconducting and Electronic Materials | Hou Y.,Intelligent Polymer Research Institute | Shi D.,Institute for Superconducting and Electronic Materials | And 6 more authors.
ACS Applied Materials and Interfaces

Nitrogen-doped crumpled graphene (NCG) is successfully synthesized via vapor phase deposition of polypyrrole onto graphene aerogel followed by thermal treatment. The NCG was explored as an electrocatalyst for the oxygen reduction reaction, showing comparable electrocatalytic performance with the commercial Pt/C in alkaline membrane exchange fuel cells because of the well-regulated nitrogen doping and the robust micro-3D crumpled porous nanostructure. © 2015 American Chemical Society. Source

De Silva D.A.,University of Wollongong | Martens P.J.,University of New South Wales | Gilmore K.J.,Intelligent Polymer Research Institute | Panhuis M.I.H.,University of Wollongong | Panhuis M.I.H.,Intelligent Polymer Research Institute
Journal of Applied Polymer Science

Ionic-covalent entanglement (ICE) hydrogels are a recently introduced new type of robust materials for potential future application in the fields of tissue engineering and soft robotics. Here the degradation behavior of gellan gum/polyacrylamide ICE hydrogels immersed in PBS or enzyme solutions is presented. It is demonstrated that ICE gels immersed in enzymes became stiffer, whereas under cyclic testing their mechanical responses stabilize after 10 loading/unloading cycles whether immersed in PBS or enzyme solutions. The leachates of the ICE hydrogels were found to be non-cytotoxic for the growth of L929 and PC12 cells. These findings will be of benefit to the future development of tissue engineering applications based on these gel materials. © 2014 Wiley Periodicals, Inc. Source

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